simonis@6465: /*
simonis@6465:  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
simonis@6465:  * Copyright 2012, 2013 SAP AG. All rights reserved.
simonis@6465:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
simonis@6465:  *
simonis@6465:  * This code is free software; you can redistribute it and/or modify it
simonis@6465:  * under the terms of the GNU General Public License version 2 only, as
simonis@6465:  * published by the Free Software Foundation.
simonis@6465:  *
simonis@6465:  * This code is distributed in the hope that it will be useful, but WITHOUT
simonis@6465:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
simonis@6465:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
simonis@6465:  * version 2 for more details (a copy is included in the LICENSE file that
simonis@6465:  * accompanied this code).
simonis@6465:  *
simonis@6465:  * You should have received a copy of the GNU General Public License version
simonis@6465:  * 2 along with this work; if not, write to the Free Software Foundation,
simonis@6465:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
simonis@6465:  *
simonis@6465:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
simonis@6465:  * or visit www.oracle.com if you need additional information or have any
simonis@6465:  * questions.
simonis@6465:  *
simonis@6465:  */
simonis@6465: 
simonis@6465: // According to the AIX OS doc #pragma alloca must be used
simonis@6465: // with C++ compiler before referencing the function alloca()
simonis@6465: #pragma alloca
simonis@6465: 
simonis@6465: // no precompiled headers
simonis@6465: #include "classfile/classLoader.hpp"
simonis@6465: #include "classfile/systemDictionary.hpp"
simonis@6465: #include "classfile/vmSymbols.hpp"
simonis@6465: #include "code/icBuffer.hpp"
simonis@6465: #include "code/vtableStubs.hpp"
simonis@6465: #include "compiler/compileBroker.hpp"
simonis@6465: #include "interpreter/interpreter.hpp"
simonis@6465: #include "jvm_aix.h"
simonis@6465: #include "libperfstat_aix.hpp"
simonis@6465: #include "loadlib_aix.hpp"
simonis@6465: #include "memory/allocation.inline.hpp"
simonis@6465: #include "memory/filemap.hpp"
simonis@6465: #include "mutex_aix.inline.hpp"
simonis@6465: #include "oops/oop.inline.hpp"
simonis@6465: #include "os_share_aix.hpp"
simonis@6465: #include "porting_aix.hpp"
simonis@6465: #include "prims/jniFastGetField.hpp"
simonis@6465: #include "prims/jvm.h"
simonis@6465: #include "prims/jvm_misc.hpp"
simonis@6465: #include "runtime/arguments.hpp"
simonis@6465: #include "runtime/extendedPC.hpp"
simonis@6465: #include "runtime/globals.hpp"
simonis@6465: #include "runtime/interfaceSupport.hpp"
simonis@6465: #include "runtime/java.hpp"
simonis@6465: #include "runtime/javaCalls.hpp"
simonis@6465: #include "runtime/mutexLocker.hpp"
simonis@6465: #include "runtime/objectMonitor.hpp"
simonis@6465: #include "runtime/osThread.hpp"
simonis@6465: #include "runtime/perfMemory.hpp"
simonis@6465: #include "runtime/sharedRuntime.hpp"
simonis@6465: #include "runtime/statSampler.hpp"
simonis@6465: #include "runtime/stubRoutines.hpp"
simonis@6465: #include "runtime/threadCritical.hpp"
simonis@6465: #include "runtime/timer.hpp"
simonis@6465: #include "services/attachListener.hpp"
simonis@6465: #include "services/runtimeService.hpp"
simonis@6465: #include "thread_aix.inline.hpp"
simonis@6465: #include "utilities/decoder.hpp"
simonis@6465: #include "utilities/defaultStream.hpp"
simonis@6465: #include "utilities/events.hpp"
simonis@6465: #include "utilities/growableArray.hpp"
simonis@6465: #include "utilities/vmError.hpp"
simonis@6465: #ifdef TARGET_ARCH_ppc
simonis@6465: # include "assembler_ppc.inline.hpp"
simonis@6465: # include "nativeInst_ppc.hpp"
simonis@6465: #endif
simonis@6465: #ifdef COMPILER1
simonis@6465: #include "c1/c1_Runtime1.hpp"
simonis@6465: #endif
simonis@6465: #ifdef COMPILER2
simonis@6465: #include "opto/runtime.hpp"
simonis@6465: #endif
simonis@6465: 
simonis@6465: // put OS-includes here (sorted alphabetically)
simonis@6465: #include <errno.h>
simonis@6465: #include <fcntl.h>
simonis@6465: #include <inttypes.h>
simonis@6465: #include <poll.h>
simonis@6465: #include <procinfo.h>
simonis@6465: #include <pthread.h>
simonis@6465: #include <pwd.h>
simonis@6465: #include <semaphore.h>
simonis@6465: #include <signal.h>
simonis@6465: #include <stdint.h>
simonis@6465: #include <stdio.h>
simonis@6465: #include <string.h>
simonis@6465: #include <unistd.h>
simonis@6465: #include <sys/ioctl.h>
simonis@6465: #include <sys/ipc.h>
simonis@6465: #include <sys/mman.h>
simonis@6465: #include <sys/resource.h>
simonis@6465: #include <sys/select.h>
simonis@6465: #include <sys/shm.h>
simonis@6465: #include <sys/socket.h>
simonis@6465: #include <sys/stat.h>
simonis@6465: #include <sys/sysinfo.h>
simonis@6465: #include <sys/systemcfg.h>
simonis@6465: #include <sys/time.h>
simonis@6465: #include <sys/times.h>
simonis@6465: #include <sys/types.h>
simonis@6465: #include <sys/utsname.h>
simonis@6465: #include <sys/vminfo.h>
simonis@6465: #include <sys/wait.h>
simonis@6465: 
simonis@6465: // Add missing declarations (should be in procinfo.h but isn't until AIX 6.1).
simonis@6465: #if !defined(_AIXVERSION_610)
simonis@6465: extern "C" {
simonis@6465:   int getthrds64(pid_t ProcessIdentifier,
simonis@6465:                  struct thrdentry64* ThreadBuffer,
simonis@6465:                  int ThreadSize,
simonis@6465:                  tid64_t* IndexPointer,
simonis@6465:                  int Count);
simonis@6465: }
simonis@6465: #endif
simonis@6465: 
simonis@6465: // Excerpts from systemcfg.h definitions newer than AIX 5.3
simonis@6465: #ifndef PV_7
simonis@6465: # define PV_7 0x200000          // Power PC 7
simonis@6465: # define PV_7_Compat 0x208000   // Power PC 7
simonis@6465: #endif
simonis@6465: 
simonis@6465: #define MAX_PATH (2 * K)
simonis@6465: 
simonis@6465: // for timer info max values which include all bits
simonis@6465: #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
simonis@6465: // for multipage initialization error analysis (in 'g_multipage_error')
simonis@6465: #define ERROR_MP_OS_TOO_OLD                          100
simonis@6465: #define ERROR_MP_EXTSHM_ACTIVE                       101
simonis@6465: #define ERROR_MP_VMGETINFO_FAILED                    102
simonis@6465: #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
simonis@6465: 
simonis@6465: // the semantics in this file are thus that codeptr_t is a *real code ptr*
simonis@6465: // This means that any function taking codeptr_t as arguments will assume
simonis@6465: // a real codeptr and won't handle function descriptors (eg getFuncName),
simonis@6465: // whereas functions taking address as args will deal with function
simonis@6465: // descriptors (eg os::dll_address_to_library_name)
simonis@6465: typedef unsigned int* codeptr_t;
simonis@6465: 
simonis@6465: // typedefs for stackslots, stack pointers, pointers to op codes
simonis@6465: typedef unsigned long stackslot_t;
simonis@6465: typedef stackslot_t* stackptr_t;
simonis@6465: 
simonis@6465: // query dimensions of the stack of the calling thread
simonis@6465: static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size);
simonis@6465: 
simonis@6465: // function to check a given stack pointer against given stack limits
simonis@6465: inline bool is_valid_stackpointer(stackptr_t sp, stackptr_t stack_base, size_t stack_size) {
simonis@6465:   if (((uintptr_t)sp) & 0x7) {
simonis@6465:     return false;
simonis@6465:   }
simonis@6465:   if (sp > stack_base) {
simonis@6465:     return false;
simonis@6465:   }
simonis@6465:   if (sp < (stackptr_t) ((address)stack_base - stack_size)) {
simonis@6465:     return false;
simonis@6465:   }
simonis@6465:   return true;
simonis@6465: }
simonis@6465: 
simonis@6465: // returns true if function is a valid codepointer
simonis@6465: inline bool is_valid_codepointer(codeptr_t p) {
simonis@6465:   if (!p) {
simonis@6465:     return false;
simonis@6465:   }
simonis@6465:   if (((uintptr_t)p) & 0x3) {
simonis@6465:     return false;
simonis@6465:   }
simonis@6465:   if (LoadedLibraries::find_for_text_address((address)p) == NULL) {
simonis@6465:     return false;
simonis@6465:   }
simonis@6465:   return true;
simonis@6465: }
simonis@6465: 
simonis@6465: // macro to check a given stack pointer against given stack limits and to die if test fails
simonis@6465: #define CHECK_STACK_PTR(sp, stack_base, stack_size) { \
simonis@6465:     guarantee(is_valid_stackpointer((stackptr_t)(sp), (stackptr_t)(stack_base), stack_size), "Stack Pointer Invalid"); \
simonis@6465: }
simonis@6465: 
simonis@6465: // macro to check the current stack pointer against given stacklimits
simonis@6465: #define CHECK_CURRENT_STACK_PTR(stack_base, stack_size) { \
simonis@6465:   address sp; \
simonis@6465:   sp = os::current_stack_pointer(); \
simonis@6465:   CHECK_STACK_PTR(sp, stack_base, stack_size); \
simonis@6465: }
simonis@6465: 
simonis@6465: ////////////////////////////////////////////////////////////////////////////////
simonis@6465: // global variables (for a description see os_aix.hpp)
simonis@6465: 
simonis@6465: julong    os::Aix::_physical_memory = 0;
simonis@6465: pthread_t os::Aix::_main_thread = ((pthread_t)0);
simonis@6465: int       os::Aix::_page_size = -1;
simonis@6465: int       os::Aix::_on_pase = -1;
simonis@6465: int       os::Aix::_os_version = -1;
simonis@6465: int       os::Aix::_stack_page_size = -1;
simonis@6465: size_t    os::Aix::_shm_default_page_size = -1;
simonis@6465: int       os::Aix::_can_use_64K_pages = -1;
simonis@6465: int       os::Aix::_can_use_16M_pages = -1;
simonis@6465: int       os::Aix::_xpg_sus_mode = -1;
simonis@6465: int       os::Aix::_extshm = -1;
simonis@6465: int       os::Aix::_logical_cpus = -1;
simonis@6465: 
simonis@6465: ////////////////////////////////////////////////////////////////////////////////
simonis@6465: // local variables
simonis@6465: 
simonis@6465: static int      g_multipage_error  = -1;   // error analysis for multipage initialization
simonis@6465: static jlong    initial_time_count = 0;
simonis@6465: static int      clock_tics_per_sec = 100;
simonis@6465: static sigset_t check_signal_done;         // For diagnostics to print a message once (see run_periodic_checks)
simonis@6465: static bool     check_signals      = true;
simonis@6465: static pid_t    _initial_pid       = 0;
simonis@6465: static int      SR_signum          = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
simonis@6465: static sigset_t SR_sigset;
simonis@6465: static pthread_mutex_t dl_mutex;           // Used to protect dlsym() calls */
simonis@6465: 
simonis@6465: julong os::available_memory() {
simonis@6465:   return Aix::available_memory();
simonis@6465: }
simonis@6465: 
simonis@6465: julong os::Aix::available_memory() {
simonis@6471:   os::Aix::meminfo_t mi;
simonis@6471:   if (os::Aix::get_meminfo(&mi)) {
simonis@6471:     return mi.real_free;
simonis@6471:   } else {
simonis@6471:     return 0xFFFFFFFFFFFFFFFFLL;
simonis@6471:   }
simonis@6465: }
simonis@6465: 
simonis@6465: julong os::physical_memory() {
simonis@6465:   return Aix::physical_memory();
simonis@6465: }
simonis@6465: 
simonis@6465: ////////////////////////////////////////////////////////////////////////////////
simonis@6465: // environment support
simonis@6465: 
simonis@6465: bool os::getenv(const char* name, char* buf, int len) {
simonis@6465:   const char* val = ::getenv(name);
simonis@6465:   if (val != NULL && strlen(val) < (size_t)len) {
simonis@6465:     strcpy(buf, val);
simonis@6465:     return true;
simonis@6465:   }
simonis@6465:   if (len > 0) buf[0] = 0;  // return a null string
simonis@6465:   return false;
simonis@6465: }
simonis@6465: 
simonis@6465: 
simonis@6465: // Return true if user is running as root.
simonis@6465: 
simonis@6465: bool os::have_special_privileges() {
simonis@6465:   static bool init = false;
simonis@6465:   static bool privileges = false;
simonis@6465:   if (!init) {
simonis@6465:     privileges = (getuid() != geteuid()) || (getgid() != getegid());
simonis@6465:     init = true;
simonis@6465:   }
simonis@6465:   return privileges;
simonis@6465: }
simonis@6465: 
simonis@6465: // Helper function, emulates disclaim64 using multiple 32bit disclaims
simonis@6465: // because we cannot use disclaim64() on AS/400 and old AIX releases.
simonis@6465: static bool my_disclaim64(char* addr, size_t size) {
simonis@6465: 
simonis@6465:   if (size == 0) {
simonis@6465:     return true;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
simonis@6465:   const unsigned int maxDisclaimSize = 0x80000000;
simonis@6465: 
simonis@6465:   const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
simonis@6465:   const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
simonis@6465: 
simonis@6465:   char* p = addr;
simonis@6465: 
simonis@6465:   for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
simonis@6465:     if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
simonis@6465:       //if (Verbose)
simonis@6465:       fprintf(stderr, "Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
simonis@6465:       return false;
simonis@6465:     }
simonis@6465:     p += maxDisclaimSize;
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (lastDisclaimSize > 0) {
simonis@6465:     if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
simonis@6465:       //if (Verbose)
simonis@6465:         fprintf(stderr, "Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
simonis@6465:       return false;
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   return true;
simonis@6465: }
simonis@6465: 
simonis@6465: // Cpu architecture string
simonis@6465: #if defined(PPC32)
simonis@6465: static char cpu_arch[] = "ppc";
simonis@6465: #elif defined(PPC64)
simonis@6465: static char cpu_arch[] = "ppc64";
simonis@6465: #else
simonis@6465: #error Add appropriate cpu_arch setting
simonis@6465: #endif
simonis@6465: 
simonis@6465: 
simonis@6465: // Given an address, returns the size of the page backing that address.
simonis@6465: size_t os::Aix::query_pagesize(void* addr) {
simonis@6465: 
simonis@6465:   vm_page_info pi;
simonis@6465:   pi.addr = (uint64_t)addr;
simonis@6465:   if (::vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
simonis@6465:     return pi.pagesize;
simonis@6465:   } else {
simonis@6465:     fprintf(stderr, "vmgetinfo failed to retrieve page size for address %p (errno %d).\n", addr, errno);
simonis@6465:     assert(false, "vmgetinfo failed to retrieve page size");
simonis@6465:     return SIZE_4K;
simonis@6465:   }
simonis@6465: 
simonis@6465: }
simonis@6465: 
simonis@6465: // Returns the kernel thread id of the currently running thread.
simonis@6465: pid_t os::Aix::gettid() {
simonis@6465:   return (pid_t) thread_self();
simonis@6465: }
simonis@6465: 
simonis@6465: void os::Aix::initialize_system_info() {
simonis@6465: 
simonis@6465:   // get the number of online(logical) cpus instead of configured
simonis@6465:   os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
simonis@6465:   assert(_processor_count > 0, "_processor_count must be > 0");
simonis@6465: 
simonis@6465:   // retrieve total physical storage
simonis@6465:   os::Aix::meminfo_t mi;
simonis@6465:   if (!os::Aix::get_meminfo(&mi)) {
simonis@6465:     fprintf(stderr, "os::Aix::get_meminfo failed.\n"); fflush(stderr);
simonis@6465:     assert(false, "os::Aix::get_meminfo failed.");
simonis@6465:   }
simonis@6465:   _physical_memory = (julong) mi.real_total;
simonis@6465: }
simonis@6465: 
simonis@6465: // Helper function for tracing page sizes.
simonis@6465: static const char* describe_pagesize(size_t pagesize) {
simonis@6465:   switch (pagesize) {
simonis@6465:     case SIZE_4K : return "4K";
simonis@6465:     case SIZE_64K: return "64K";
simonis@6465:     case SIZE_16M: return "16M";
simonis@6465:     case SIZE_16G: return "16G";
simonis@6465:     default:
simonis@6465:       assert(false, "surprise");
simonis@6465:       return "??";
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: // Retrieve information about multipage size support. Will initialize
simonis@6465: // Aix::_page_size, Aix::_stack_page_size, Aix::_can_use_64K_pages,
simonis@6465: // Aix::_can_use_16M_pages.
simonis@6465: // Must be called before calling os::large_page_init().
simonis@6465: void os::Aix::query_multipage_support() {
simonis@6465: 
simonis@6465:   guarantee(_page_size == -1 &&
simonis@6465:             _stack_page_size == -1 &&
simonis@6465:             _can_use_64K_pages == -1 &&
simonis@6465:             _can_use_16M_pages == -1 &&
simonis@6465:             g_multipage_error == -1,
simonis@6465:             "do not call twice");
simonis@6465: 
simonis@6465:   _page_size = ::sysconf(_SC_PAGESIZE);
simonis@6465: 
simonis@6465:   // This really would surprise me.
simonis@6465:   assert(_page_size == SIZE_4K, "surprise!");
simonis@6465: 
simonis@6465: 
simonis@6465:   // query default data page size (default page size for C-Heap, pthread stacks and .bss).
simonis@6465:   // Default data page size is influenced either by linker options (-bdatapsize)
simonis@6465:   // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
simonis@6465:   // default should be 4K.
simonis@6465:   size_t data_page_size = SIZE_4K;
simonis@6465:   {
simonis@6465:     void* p = ::malloc(SIZE_16M);
simonis@6465:     data_page_size = os::Aix::query_pagesize(p);
simonis@6465:     ::free(p);
simonis@6465:   }
simonis@6465: 
simonis@6465:   // query default shm page size (LDR_CNTRL SHMPSIZE)
simonis@6465:   {
simonis@6465:     const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
simonis@6465:     guarantee(shmid != -1, "shmget failed");
simonis@6465:     void* p = ::shmat(shmid, NULL, 0);
simonis@6465:     ::shmctl(shmid, IPC_RMID, NULL);
simonis@6465:     guarantee(p != (void*) -1, "shmat failed");
simonis@6465:     _shm_default_page_size = os::Aix::query_pagesize(p);
simonis@6465:     ::shmdt(p);
simonis@6465:   }
simonis@6465: 
simonis@6465:   // before querying the stack page size, make sure we are not running as primordial
simonis@6465:   // thread (because primordial thread's stack may have different page size than
simonis@6465:   // pthread thread stacks). Running a VM on the primordial thread won't work for a
simonis@6465:   // number of reasons so we may just as well guarantee it here
simonis@6465:   guarantee(!os::Aix::is_primordial_thread(), "Must not be called for primordial thread");
simonis@6465: 
simonis@6465:   // query stack page size
simonis@6465:   {
simonis@6465:     int dummy = 0;
simonis@6465:     _stack_page_size = os::Aix::query_pagesize(&dummy);
simonis@6465:     // everything else would surprise me and should be looked into
simonis@6465:     guarantee(_stack_page_size == SIZE_4K || _stack_page_size == SIZE_64K, "Wrong page size");
simonis@6465:     // also, just for completeness: pthread stacks are allocated from C heap, so
simonis@6465:     // stack page size should be the same as data page size
simonis@6465:     guarantee(_stack_page_size == data_page_size, "stack page size should be the same as data page size");
simonis@6465:   }
simonis@6465: 
simonis@6465:   // EXTSHM is bad: among other things, it prevents setting pagesize dynamically
simonis@6465:   // for system V shm.
simonis@6465:   if (Aix::extshm()) {
simonis@6465:     if (Verbose) {
simonis@6465:       fprintf(stderr, "EXTSHM is active - will disable large page support.\n"
simonis@6465:                       "Please make sure EXTSHM is OFF for large page support.\n");
simonis@6465:     }
simonis@6465:     g_multipage_error = ERROR_MP_EXTSHM_ACTIVE;
simonis@6465:     _can_use_64K_pages = _can_use_16M_pages = 0;
simonis@6465:     goto query_multipage_support_end;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // now check which page sizes the OS claims it supports, and of those, which actually can be used.
simonis@6465:   {
simonis@6465:     const int MAX_PAGE_SIZES = 4;
simonis@6465:     psize_t sizes[MAX_PAGE_SIZES];
simonis@6465:     const int num_psizes = ::vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
simonis@6465:     if (num_psizes == -1) {
simonis@6465:       if (Verbose) {
simonis@6465:         fprintf(stderr, "vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)\n", errno);
simonis@6465:         fprintf(stderr, "disabling multipage support.\n");
simonis@6465:       }
simonis@6465:       g_multipage_error = ERROR_MP_VMGETINFO_FAILED;
simonis@6465:       _can_use_64K_pages = _can_use_16M_pages = 0;
simonis@6465:       goto query_multipage_support_end;
simonis@6465:     }
simonis@6465:     guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
simonis@6465:     assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
simonis@6465:     if (Verbose) {
simonis@6465:       fprintf(stderr, "vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
simonis@6465:       for (int i = 0; i < num_psizes; i ++) {
simonis@6465:         fprintf(stderr, " %s ", describe_pagesize(sizes[i]));
simonis@6465:       }
simonis@6465:       fprintf(stderr, " .\n");
simonis@6465:     }
simonis@6465: 
simonis@6465:     // Can we use 64K, 16M pages?
simonis@6465:     _can_use_64K_pages = 0;
simonis@6465:     _can_use_16M_pages = 0;
simonis@6465:     for (int i = 0; i < num_psizes; i ++) {
simonis@6465:       if (sizes[i] == SIZE_64K) {
simonis@6465:         _can_use_64K_pages = 1;
simonis@6465:       } else if (sizes[i] == SIZE_16M) {
simonis@6465:         _can_use_16M_pages = 1;
simonis@6465:       }
simonis@6465:     }
simonis@6465: 
simonis@6465:     if (!_can_use_64K_pages) {
simonis@6465:       g_multipage_error = ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K;
simonis@6465:     }
simonis@6465: 
simonis@6465:     // Double-check for 16M pages: Even if AIX claims to be able to use 16M pages,
simonis@6465:     // there must be an actual 16M page pool, and we must run with enough rights.
simonis@6465:     if (_can_use_16M_pages) {
simonis@6465:       const int shmid = ::shmget(IPC_PRIVATE, SIZE_16M, IPC_CREAT | S_IRUSR | S_IWUSR);
simonis@6465:       guarantee(shmid != -1, "shmget failed");
simonis@6465:       struct shmid_ds shm_buf = { 0 };
simonis@6465:       shm_buf.shm_pagesize = SIZE_16M;
simonis@6465:       const bool can_set_pagesize = ::shmctl(shmid, SHM_PAGESIZE, &shm_buf) == 0 ? true : false;
simonis@6465:       const int en = errno;
simonis@6465:       ::shmctl(shmid, IPC_RMID, NULL);
simonis@6465:       if (!can_set_pagesize) {
simonis@6465:         if (Verbose) {
simonis@6465:           fprintf(stderr, "Failed to allocate even one misely 16M page. shmctl failed with %d (%s).\n"
simonis@6465:                           "Will deactivate 16M support.\n", en, strerror(en));
simonis@6465:         }
simonis@6465:         _can_use_16M_pages = 0;
simonis@6465:       }
simonis@6465:     }
simonis@6465: 
simonis@6465:   } // end: check which pages can be used for shared memory
simonis@6465: 
simonis@6465: query_multipage_support_end:
simonis@6465: 
simonis@6465:   guarantee(_page_size != -1 &&
simonis@6465:             _stack_page_size != -1 &&
simonis@6465:             _can_use_64K_pages != -1 &&
simonis@6465:             _can_use_16M_pages != -1, "Page sizes not properly initialized");
simonis@6465: 
simonis@6465:   if (_can_use_64K_pages) {
simonis@6465:     g_multipage_error = 0;
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (Verbose) {
simonis@6465:     fprintf(stderr, "Data page size (C-Heap, bss, etc): %s\n", describe_pagesize(data_page_size));
simonis@6465:     fprintf(stderr, "Thread stack page size (pthread): %s\n", describe_pagesize(_stack_page_size));
simonis@6465:     fprintf(stderr, "Default shared memory page size: %s\n", describe_pagesize(_shm_default_page_size));
simonis@6465:     fprintf(stderr, "Can use 64K pages dynamically with shared meory: %s\n", (_can_use_64K_pages ? "yes" :"no"));
simonis@6465:     fprintf(stderr, "Can use 16M pages dynamically with shared memory: %s\n", (_can_use_16M_pages ? "yes" :"no"));
simonis@6465:     fprintf(stderr, "Multipage error details: %d\n", g_multipage_error);
simonis@6465:   }
simonis@6465: 
simonis@6465: } // end os::Aix::query_multipage_support()
simonis@6465: 
simonis@6465: 
simonis@6465: // The code for this method was initially derived from the version in os_linux.cpp
simonis@6465: void os::init_system_properties_values() {
simonis@6465:   // The next few definitions allow the code to be verbatim:
simonis@6465: #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal)
simonis@6465: #define DEFAULT_LIBPATH "/usr/lib:/lib"
simonis@6465: #define EXTENSIONS_DIR  "/lib/ext"
simonis@6465: #define ENDORSED_DIR    "/lib/endorsed"
simonis@6465: 
simonis@6465:   // sysclasspath, java_home, dll_dir
simonis@6465:   char *home_path;
simonis@6465:   char *dll_path;
simonis@6465:   char *pslash;
simonis@6465:   char buf[MAXPATHLEN];
simonis@6465:   os::jvm_path(buf, sizeof(buf));
simonis@6465: 
simonis@6465:   // Found the full path to libjvm.so.
simonis@6465:   // Now cut the path to <java_home>/jre if we can.
simonis@6465:   *(strrchr(buf, '/')) = '\0'; // get rid of /libjvm.so
simonis@6465:   pslash = strrchr(buf, '/');
simonis@6465:   if (pslash != NULL) {
simonis@6465:     *pslash = '\0';            // get rid of /{client|server|hotspot}
simonis@6465:   }
simonis@6465: 
simonis@6465:   dll_path = malloc(strlen(buf) + 1);
simonis@6465:   strcpy(dll_path, buf);
simonis@6465:   Arguments::set_dll_dir(dll_path);
simonis@6465: 
simonis@6465:   if (pslash != NULL) {
simonis@6465:     pslash = strrchr(buf, '/');
simonis@6465:     if (pslash != NULL) {
simonis@6465:       *pslash = '\0';          // get rid of /<arch>
simonis@6465:       pslash = strrchr(buf, '/');
simonis@6465:       if (pslash != NULL) {
simonis@6465:         *pslash = '\0';        // get rid of /lib
simonis@6465:       }
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   home_path = malloc(strlen(buf) + 1);
simonis@6465:   strcpy(home_path, buf);
simonis@6465:   Arguments::set_java_home(home_path);
simonis@6465: 
simonis@6465:   if (!set_boot_path('/', ':')) return;
simonis@6465: 
simonis@6465:   // Where to look for native libraries
simonis@6465: 
simonis@6465:   // On Aix we get the user setting of LIBPATH
simonis@6465:   // Eventually, all the library path setting will be done here.
simonis@6465:   char *ld_library_path;
simonis@6465: 
simonis@6465:   // Construct the invariant part of ld_library_path.
simonis@6465:   ld_library_path = (char *) malloc(sizeof(DEFAULT_LIBPATH));
simonis@6465:   sprintf(ld_library_path, DEFAULT_LIBPATH);
simonis@6465: 
simonis@6465:   // Get the user setting of LIBPATH, and prepended it.
simonis@6465:   char *v = ::getenv("LIBPATH");
simonis@6465:   if (v == NULL) {
simonis@6465:     v = "";
simonis@6465:   }
simonis@6465: 
simonis@6465:   char *t = ld_library_path;
simonis@6465:   // That's +1 for the colon and +1 for the trailing '\0'
simonis@6465:   ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1);
simonis@6465:   sprintf(ld_library_path, "%s:%s", v, t);
simonis@6465: 
simonis@6465:   Arguments::set_library_path(ld_library_path);
simonis@6465: 
simonis@6465:   // Extensions directories
simonis@6465:   char* cbuf = malloc(strlen(Arguments::get_java_home()) + sizeof(EXTENSIONS_DIR));
simonis@6465:   sprintf(cbuf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
simonis@6465:   Arguments::set_ext_dirs(cbuf);
simonis@6465: 
simonis@6465:   // Endorsed standards default directory.
simonis@6465:   cbuf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
simonis@6465:   sprintf(cbuf, "%s" ENDORSED_DIR, Arguments::get_java_home());
simonis@6465:   Arguments::set_endorsed_dirs(cbuf);
simonis@6465: 
simonis@6465: #undef malloc
simonis@6465: #undef DEFAULT_LIBPATH
simonis@6465: #undef EXTENSIONS_DIR
simonis@6465: #undef ENDORSED_DIR
simonis@6465: }
simonis@6465: 
simonis@6465: ////////////////////////////////////////////////////////////////////////////////
simonis@6465: // breakpoint support
simonis@6465: 
simonis@6465: void os::breakpoint() {
simonis@6465:   BREAKPOINT;
simonis@6465: }
simonis@6465: 
simonis@6465: extern "C" void breakpoint() {
simonis@6465:   // use debugger to set breakpoint here
simonis@6465: }
simonis@6465: 
simonis@6465: ////////////////////////////////////////////////////////////////////////////////
simonis@6465: // signal support
simonis@6465: 
simonis@6465: debug_only(static bool signal_sets_initialized = false);
simonis@6465: static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
simonis@6465: 
simonis@6465: bool os::Aix::is_sig_ignored(int sig) {
simonis@6465:   struct sigaction oact;
simonis@6465:   sigaction(sig, (struct sigaction*)NULL, &oact);
simonis@6465:   void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
simonis@6465:     : CAST_FROM_FN_PTR(void*, oact.sa_handler);
simonis@6465:   if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
simonis@6465:     return true;
simonis@6465:   else
simonis@6465:     return false;
simonis@6465: }
simonis@6465: 
simonis@6465: void os::Aix::signal_sets_init() {
simonis@6465:   // Should also have an assertion stating we are still single-threaded.
simonis@6465:   assert(!signal_sets_initialized, "Already initialized");
simonis@6465:   // Fill in signals that are necessarily unblocked for all threads in
simonis@6465:   // the VM. Currently, we unblock the following signals:
simonis@6465:   // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
simonis@6465:   //                         by -Xrs (=ReduceSignalUsage));
simonis@6465:   // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
simonis@6465:   // other threads. The "ReduceSignalUsage" boolean tells us not to alter
simonis@6465:   // the dispositions or masks wrt these signals.
simonis@6465:   // Programs embedding the VM that want to use the above signals for their
simonis@6465:   // own purposes must, at this time, use the "-Xrs" option to prevent
simonis@6465:   // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
simonis@6465:   // (See bug 4345157, and other related bugs).
simonis@6465:   // In reality, though, unblocking these signals is really a nop, since
simonis@6465:   // these signals are not blocked by default.
simonis@6465:   sigemptyset(&unblocked_sigs);
simonis@6465:   sigemptyset(&allowdebug_blocked_sigs);
simonis@6465:   sigaddset(&unblocked_sigs, SIGILL);
simonis@6465:   sigaddset(&unblocked_sigs, SIGSEGV);
simonis@6465:   sigaddset(&unblocked_sigs, SIGBUS);
simonis@6465:   sigaddset(&unblocked_sigs, SIGFPE);
simonis@6465:   sigaddset(&unblocked_sigs, SIGTRAP);
simonis@6465:   sigaddset(&unblocked_sigs, SIGDANGER);
simonis@6465:   sigaddset(&unblocked_sigs, SR_signum);
simonis@6465: 
simonis@6465:   if (!ReduceSignalUsage) {
simonis@6465:    if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
simonis@6465:      sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
simonis@6465:      sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
simonis@6465:    }
simonis@6465:    if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
simonis@6465:      sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
simonis@6465:      sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
simonis@6465:    }
simonis@6465:    if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
simonis@6465:      sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
simonis@6465:      sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
simonis@6465:    }
simonis@6465:   }
simonis@6465:   // Fill in signals that are blocked by all but the VM thread.
simonis@6465:   sigemptyset(&vm_sigs);
simonis@6465:   if (!ReduceSignalUsage)
simonis@6465:     sigaddset(&vm_sigs, BREAK_SIGNAL);
simonis@6465:   debug_only(signal_sets_initialized = true);
simonis@6465: }
simonis@6465: 
simonis@6465: // These are signals that are unblocked while a thread is running Java.
simonis@6465: // (For some reason, they get blocked by default.)
simonis@6465: sigset_t* os::Aix::unblocked_signals() {
simonis@6465:   assert(signal_sets_initialized, "Not initialized");
simonis@6465:   return &unblocked_sigs;
simonis@6465: }
simonis@6465: 
simonis@6465: // These are the signals that are blocked while a (non-VM) thread is
simonis@6465: // running Java. Only the VM thread handles these signals.
simonis@6465: sigset_t* os::Aix::vm_signals() {
simonis@6465:   assert(signal_sets_initialized, "Not initialized");
simonis@6465:   return &vm_sigs;
simonis@6465: }
simonis@6465: 
simonis@6465: // These are signals that are blocked during cond_wait to allow debugger in
simonis@6465: sigset_t* os::Aix::allowdebug_blocked_signals() {
simonis@6465:   assert(signal_sets_initialized, "Not initialized");
simonis@6465:   return &allowdebug_blocked_sigs;
simonis@6465: }
simonis@6465: 
simonis@6465: void os::Aix::hotspot_sigmask(Thread* thread) {
simonis@6465: 
simonis@6465:   //Save caller's signal mask before setting VM signal mask
simonis@6465:   sigset_t caller_sigmask;
simonis@6465:   pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
simonis@6465: 
simonis@6465:   OSThread* osthread = thread->osthread();
simonis@6465:   osthread->set_caller_sigmask(caller_sigmask);
simonis@6465: 
simonis@6465:   pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
simonis@6465: 
simonis@6465:   if (!ReduceSignalUsage) {
simonis@6465:     if (thread->is_VM_thread()) {
simonis@6465:       // Only the VM thread handles BREAK_SIGNAL ...
simonis@6465:       pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
simonis@6465:     } else {
simonis@6465:       // ... all other threads block BREAK_SIGNAL
simonis@6465:       pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
simonis@6465:     }
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: // retrieve memory information.
simonis@6465: // Returns false if something went wrong;
simonis@6465: // content of pmi undefined in this case.
simonis@6465: bool os::Aix::get_meminfo(meminfo_t* pmi) {
simonis@6465: 
simonis@6465:   assert(pmi, "get_meminfo: invalid parameter");
simonis@6465: 
simonis@6465:   memset(pmi, 0, sizeof(meminfo_t));
simonis@6465: 
simonis@6465:   if (os::Aix::on_pase()) {
simonis@6465: 
simonis@6465:     Unimplemented();
simonis@6465:     return false;
simonis@6465: 
simonis@6465:   } else {
simonis@6465: 
simonis@6465:     // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
simonis@6465:     // See:
simonis@6465:     // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
simonis@6465:     //        ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
simonis@6465:     // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
simonis@6465:     //        ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
simonis@6465: 
simonis@6465:     perfstat_memory_total_t psmt;
simonis@6465:     memset (&psmt, '\0', sizeof(psmt));
simonis@6465:     const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
simonis@6465:     if (rc == -1) {
simonis@6465:       fprintf(stderr, "perfstat_memory_total() failed (errno=%d)\n", errno);
simonis@6465:       assert(0, "perfstat_memory_total() failed");
simonis@6465:       return false;
simonis@6465:     }
simonis@6465: 
simonis@6465:     assert(rc == 1, "perfstat_memory_total() - weird return code");
simonis@6465: 
simonis@6465:     // excerpt from
simonis@6465:     // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
simonis@6465:     //        ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
simonis@6465:     // The fields of perfstat_memory_total_t:
simonis@6465:     // u_longlong_t virt_total         Total virtual memory (in 4 KB pages).
simonis@6465:     // u_longlong_t real_total         Total real memory (in 4 KB pages).
simonis@6465:     // u_longlong_t real_free          Free real memory (in 4 KB pages).
simonis@6465:     // u_longlong_t pgsp_total         Total paging space (in 4 KB pages).
simonis@6465:     // u_longlong_t pgsp_free          Free paging space (in 4 KB pages).
simonis@6465: 
simonis@6465:     pmi->virt_total = psmt.virt_total * 4096;
simonis@6465:     pmi->real_total = psmt.real_total * 4096;
simonis@6465:     pmi->real_free = psmt.real_free * 4096;
simonis@6465:     pmi->pgsp_total = psmt.pgsp_total * 4096;
simonis@6465:     pmi->pgsp_free = psmt.pgsp_free * 4096;
simonis@6465: 
simonis@6465:     return true;
simonis@6465: 
simonis@6465:   }
simonis@6465: } // end os::Aix::get_meminfo
simonis@6465: 
simonis@6465: // Retrieve global cpu information.
simonis@6465: // Returns false if something went wrong;
simonis@6465: // the content of pci is undefined in this case.
simonis@6465: bool os::Aix::get_cpuinfo(cpuinfo_t* pci) {
simonis@6465:   assert(pci, "get_cpuinfo: invalid parameter");
simonis@6465:   memset(pci, 0, sizeof(cpuinfo_t));
simonis@6465: 
simonis@6465:   perfstat_cpu_total_t psct;
simonis@6465:   memset (&psct, '\0', sizeof(psct));
simonis@6465: 
simonis@6465:   if (-1 == libperfstat::perfstat_cpu_total(NULL, &psct, sizeof(perfstat_cpu_total_t), 1)) {
simonis@6465:     fprintf(stderr, "perfstat_cpu_total() failed (errno=%d)\n", errno);
simonis@6465:     assert(0, "perfstat_cpu_total() failed");
simonis@6465:     return false;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // global cpu information
simonis@6465:   strcpy (pci->description, psct.description);
simonis@6465:   pci->processorHZ = psct.processorHZ;
simonis@6465:   pci->ncpus = psct.ncpus;
simonis@6465:   os::Aix::_logical_cpus = psct.ncpus;
simonis@6465:   for (int i = 0; i < 3; i++) {
simonis@6465:     pci->loadavg[i] = (double) psct.loadavg[i] / (1 << SBITS);
simonis@6465:   }
simonis@6465: 
simonis@6465:   // get the processor version from _system_configuration
simonis@6465:   switch (_system_configuration.version) {
simonis@6465:   case PV_7:
simonis@6465:     strcpy(pci->version, "Power PC 7");
simonis@6465:     break;
simonis@6465:   case PV_6_1:
simonis@6465:     strcpy(pci->version, "Power PC 6 DD1.x");
simonis@6465:     break;
simonis@6465:   case PV_6:
simonis@6465:     strcpy(pci->version, "Power PC 6");
simonis@6465:     break;
simonis@6465:   case PV_5:
simonis@6465:     strcpy(pci->version, "Power PC 5");
simonis@6465:     break;
simonis@6465:   case PV_5_2:
simonis@6465:     strcpy(pci->version, "Power PC 5_2");
simonis@6465:     break;
simonis@6465:   case PV_5_3:
simonis@6465:     strcpy(pci->version, "Power PC 5_3");
simonis@6465:     break;
simonis@6465:   case PV_5_Compat:
simonis@6465:     strcpy(pci->version, "PV_5_Compat");
simonis@6465:     break;
simonis@6465:   case PV_6_Compat:
simonis@6465:     strcpy(pci->version, "PV_6_Compat");
simonis@6465:     break;
simonis@6465:   case PV_7_Compat:
simonis@6465:     strcpy(pci->version, "PV_7_Compat");
simonis@6465:     break;
simonis@6465:   default:
simonis@6465:     strcpy(pci->version, "unknown");
simonis@6465:   }
simonis@6465: 
simonis@6465:   return true;
simonis@6465: 
simonis@6465: } //end os::Aix::get_cpuinfo
simonis@6465: 
simonis@6465: //////////////////////////////////////////////////////////////////////////////
simonis@6465: // detecting pthread library
simonis@6465: 
simonis@6465: void os::Aix::libpthread_init() {
simonis@6465:   return;
simonis@6465: }
simonis@6465: 
simonis@6465: //////////////////////////////////////////////////////////////////////////////
simonis@6465: // create new thread
simonis@6465: 
simonis@6465: // Thread start routine for all newly created threads
simonis@6465: static void *java_start(Thread *thread) {
simonis@6465: 
simonis@6465:   // find out my own stack dimensions
simonis@6465:   {
simonis@6465:     // actually, this should do exactly the same as thread->record_stack_base_and_size...
simonis@6465:     address base = 0;
simonis@6465:     size_t size = 0;
simonis@6465:     query_stack_dimensions(&base, &size);
simonis@6465:     thread->set_stack_base(base);
simonis@6465:     thread->set_stack_size(size);
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Do some sanity checks.
simonis@6465:   CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
simonis@6465: 
simonis@6465:   // Try to randomize the cache line index of hot stack frames.
simonis@6465:   // This helps when threads of the same stack traces evict each other's
simonis@6465:   // cache lines. The threads can be either from the same JVM instance, or
simonis@6465:   // from different JVM instances. The benefit is especially true for
simonis@6465:   // processors with hyperthreading technology.
simonis@6465: 
simonis@6465:   static int counter = 0;
simonis@6465:   int pid = os::current_process_id();
simonis@6465:   alloca(((pid ^ counter++) & 7) * 128);
simonis@6465: 
simonis@6465:   ThreadLocalStorage::set_thread(thread);
simonis@6465: 
simonis@6465:   OSThread* osthread = thread->osthread();
simonis@6465: 
simonis@6465:   // thread_id is kernel thread id (similar to Solaris LWP id)
simonis@6465:   osthread->set_thread_id(os::Aix::gettid());
simonis@6465: 
simonis@6465:   // initialize signal mask for this thread
simonis@6465:   os::Aix::hotspot_sigmask(thread);
simonis@6465: 
simonis@6465:   // initialize floating point control register
simonis@6465:   os::Aix::init_thread_fpu_state();
simonis@6465: 
simonis@6465:   assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
simonis@6465: 
simonis@6465:   // call one more level start routine
simonis@6465:   thread->run();
simonis@6465: 
simonis@6465:   return 0;
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
simonis@6465: 
simonis@6465:   // We want the whole function to be synchronized.
simonis@6465:   ThreadCritical cs;
simonis@6465: 
simonis@6465:   assert(thread->osthread() == NULL, "caller responsible");
simonis@6465: 
simonis@6465:   // Allocate the OSThread object
simonis@6465:   OSThread* osthread = new OSThread(NULL, NULL);
simonis@6465:   if (osthread == NULL) {
simonis@6465:     return false;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // set the correct thread state
simonis@6465:   osthread->set_thread_type(thr_type);
simonis@6465: 
simonis@6465:   // Initial state is ALLOCATED but not INITIALIZED
simonis@6465:   osthread->set_state(ALLOCATED);
simonis@6465: 
simonis@6465:   thread->set_osthread(osthread);
simonis@6465: 
simonis@6465:   // init thread attributes
simonis@6465:   pthread_attr_t attr;
simonis@6465:   pthread_attr_init(&attr);
simonis@6465:   guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
simonis@6465: 
simonis@6465:   // Make sure we run in 1:1 kernel-user-thread mode.
simonis@6465:   if (os::Aix::on_aix()) {
simonis@6465:     guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
simonis@6465:     guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
simonis@6465:   } // end: aix
simonis@6465: 
simonis@6465:   // Start in suspended state, and in os::thread_start, wake the thread up.
simonis@6465:   guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
simonis@6465: 
simonis@6465:   // calculate stack size if it's not specified by caller
simonis@6465:   if (os::Aix::supports_variable_stack_size()) {
simonis@6465:     if (stack_size == 0) {
simonis@6465:       stack_size = os::Aix::default_stack_size(thr_type);
simonis@6465: 
simonis@6465:       switch (thr_type) {
simonis@6465:       case os::java_thread:
simonis@6465:         // Java threads use ThreadStackSize whose default value can be changed with the flag -Xss.
simonis@6465:         assert(JavaThread::stack_size_at_create() > 0, "this should be set");
simonis@6465:         stack_size = JavaThread::stack_size_at_create();
simonis@6465:         break;
simonis@6465:       case os::compiler_thread:
simonis@6465:         if (CompilerThreadStackSize > 0) {
simonis@6465:           stack_size = (size_t)(CompilerThreadStackSize * K);
simonis@6465:           break;
simonis@6465:         } // else fall through:
simonis@6465:           // use VMThreadStackSize if CompilerThreadStackSize is not defined
simonis@6465:       case os::vm_thread:
simonis@6465:       case os::pgc_thread:
simonis@6465:       case os::cgc_thread:
simonis@6465:       case os::watcher_thread:
simonis@6465:         if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
simonis@6465:         break;
simonis@6465:       }
simonis@6465:     }
simonis@6465: 
simonis@6465:     stack_size = MAX2(stack_size, os::Aix::min_stack_allowed);
simonis@6465:     pthread_attr_setstacksize(&attr, stack_size);
simonis@6465:   } //else let thread_create() pick the default value (96 K on AIX)
simonis@6465: 
simonis@6465:   pthread_t tid;
simonis@6465:   int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
simonis@6465: 
simonis@6465:   pthread_attr_destroy(&attr);
simonis@6465: 
simonis@6465:   if (ret != 0) {
simonis@6465:     if (PrintMiscellaneous && (Verbose || WizardMode)) {
simonis@6465:       perror("pthread_create()");
simonis@6465:     }
simonis@6465:     // Need to clean up stuff we've allocated so far
simonis@6465:     thread->set_osthread(NULL);
simonis@6465:     delete osthread;
simonis@6465:     return false;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Store pthread info into the OSThread
simonis@6465:   osthread->set_pthread_id(tid);
simonis@6465: 
simonis@6465:   return true;
simonis@6465: }
simonis@6465: 
simonis@6465: /////////////////////////////////////////////////////////////////////////////
simonis@6465: // attach existing thread
simonis@6465: 
simonis@6465: // bootstrap the main thread
simonis@6465: bool os::create_main_thread(JavaThread* thread) {
simonis@6465:   assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
simonis@6465:   return create_attached_thread(thread);
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::create_attached_thread(JavaThread* thread) {
simonis@6465: #ifdef ASSERT
simonis@6465:     thread->verify_not_published();
simonis@6465: #endif
simonis@6465: 
simonis@6465:   // Allocate the OSThread object
simonis@6465:   OSThread* osthread = new OSThread(NULL, NULL);
simonis@6465: 
simonis@6465:   if (osthread == NULL) {
simonis@6465:     return false;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Store pthread info into the OSThread
simonis@6465:   osthread->set_thread_id(os::Aix::gettid());
simonis@6465:   osthread->set_pthread_id(::pthread_self());
simonis@6465: 
simonis@6465:   // initialize floating point control register
simonis@6465:   os::Aix::init_thread_fpu_state();
simonis@6465: 
simonis@6465:   // some sanity checks
simonis@6465:   CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
simonis@6465: 
simonis@6465:   // Initial thread state is RUNNABLE
simonis@6465:   osthread->set_state(RUNNABLE);
simonis@6465: 
simonis@6465:   thread->set_osthread(osthread);
simonis@6465: 
simonis@6465:   if (UseNUMA) {
simonis@6465:     int lgrp_id = os::numa_get_group_id();
simonis@6465:     if (lgrp_id != -1) {
simonis@6465:       thread->set_lgrp_id(lgrp_id);
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   // initialize signal mask for this thread
simonis@6465:   // and save the caller's signal mask
simonis@6465:   os::Aix::hotspot_sigmask(thread);
simonis@6465: 
simonis@6465:   return true;
simonis@6465: }
simonis@6465: 
simonis@6465: void os::pd_start_thread(Thread* thread) {
simonis@6465:   int status = pthread_continue_np(thread->osthread()->pthread_id());
simonis@6465:   assert(status == 0, "thr_continue failed");
simonis@6465: }
simonis@6465: 
simonis@6465: // Free OS resources related to the OSThread
simonis@6465: void os::free_thread(OSThread* osthread) {
simonis@6465:   assert(osthread != NULL, "osthread not set");
simonis@6465: 
simonis@6465:   if (Thread::current()->osthread() == osthread) {
simonis@6465:     // Restore caller's signal mask
simonis@6465:     sigset_t sigmask = osthread->caller_sigmask();
simonis@6465:     pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
simonis@6465:    }
simonis@6465: 
simonis@6465:   delete osthread;
simonis@6465: }
simonis@6465: 
simonis@6465: //////////////////////////////////////////////////////////////////////////////
simonis@6465: // thread local storage
simonis@6465: 
simonis@6465: int os::allocate_thread_local_storage() {
simonis@6465:   pthread_key_t key;
simonis@6465:   int rslt = pthread_key_create(&key, NULL);
simonis@6465:   assert(rslt == 0, "cannot allocate thread local storage");
simonis@6465:   return (int)key;
simonis@6465: }
simonis@6465: 
simonis@6465: // Note: This is currently not used by VM, as we don't destroy TLS key
simonis@6465: // on VM exit.
simonis@6465: void os::free_thread_local_storage(int index) {
simonis@6465:   int rslt = pthread_key_delete((pthread_key_t)index);
simonis@6465:   assert(rslt == 0, "invalid index");
simonis@6465: }
simonis@6465: 
simonis@6465: void os::thread_local_storage_at_put(int index, void* value) {
simonis@6465:   int rslt = pthread_setspecific((pthread_key_t)index, value);
simonis@6465:   assert(rslt == 0, "pthread_setspecific failed");
simonis@6465: }
simonis@6465: 
simonis@6465: extern "C" Thread* get_thread() {
simonis@6465:   return ThreadLocalStorage::thread();
simonis@6465: }
simonis@6465: 
simonis@6465: ////////////////////////////////////////////////////////////////////////////////
simonis@6465: // time support
simonis@6465: 
simonis@6465: // Time since start-up in seconds to a fine granularity.
simonis@6465: // Used by VMSelfDestructTimer and the MemProfiler.
simonis@6465: double os::elapsedTime() {
simonis@6465:   return (double)(os::elapsed_counter()) * 0.000001;
simonis@6465: }
simonis@6465: 
simonis@6465: jlong os::elapsed_counter() {
simonis@6465:   timeval time;
simonis@6465:   int status = gettimeofday(&time, NULL);
simonis@6465:   return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
simonis@6465: }
simonis@6465: 
simonis@6465: jlong os::elapsed_frequency() {
simonis@6465:   return (1000 * 1000);
simonis@6465: }
simonis@6465: 
simonis@6465: // For now, we say that linux does not support vtime. I have no idea
simonis@6465: // whether it can actually be made to (DLD, 9/13/05).
simonis@6465: 
simonis@6465: bool os::supports_vtime() { return false; }
simonis@6465: bool os::enable_vtime()   { return false; }
simonis@6465: bool os::vtime_enabled()  { return false; }
simonis@6465: double os::elapsedVTime() {
simonis@6465:   // better than nothing, but not much
simonis@6465:   return elapsedTime();
simonis@6465: }
simonis@6465: 
simonis@6465: jlong os::javaTimeMillis() {
simonis@6465:   timeval time;
simonis@6465:   int status = gettimeofday(&time, NULL);
simonis@6465:   assert(status != -1, "aix error at gettimeofday()");
simonis@6465:   return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
simonis@6465: }
simonis@6465: 
simonis@6465: // We need to manually declare mread_real_time,
simonis@6465: // because IBM didn't provide a prototype in time.h.
simonis@6465: // (they probably only ever tested in C, not C++)
simonis@6465: extern "C"
simonis@6465: int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
simonis@6465: 
simonis@6465: jlong os::javaTimeNanos() {
simonis@6465:   if (os::Aix::on_pase()) {
simonis@6465:     Unimplemented();
simonis@6465:     return 0;
simonis@6465:   }
simonis@6465:   else {
simonis@6465:     // On AIX use the precision of processors real time clock
simonis@6465:     // or time base registers.
simonis@6465:     timebasestruct_t time;
simonis@6465:     int rc;
simonis@6465: 
simonis@6465:     // If the CPU has a time register, it will be used and
simonis@6465:     // we have to convert to real time first. After convertion we have following data:
simonis@6465:     // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
simonis@6465:     // time.tb_low  [nanoseconds after the last full second above]
simonis@6465:     // We better use mread_real_time here instead of read_real_time
simonis@6465:     // to ensure that we will get a monotonic increasing time.
simonis@6465:     if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
simonis@6465:       rc = time_base_to_time(&time, TIMEBASE_SZ);
simonis@6465:       assert(rc != -1, "aix error at time_base_to_time()");
simonis@6465:     }
simonis@6465:     return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
simonis@6465:   {
simonis@6465:     // gettimeofday - based on time in seconds since the Epoch thus does not wrap
simonis@6465:     info_ptr->max_value = ALL_64_BITS;
simonis@6465: 
simonis@6465:     // gettimeofday is a real time clock so it skips
simonis@6465:     info_ptr->may_skip_backward = true;
simonis@6465:     info_ptr->may_skip_forward = true;
simonis@6465:   }
simonis@6465: 
simonis@6465:   info_ptr->kind = JVMTI_TIMER_ELAPSED;    // elapsed not CPU time
simonis@6465: }
simonis@6465: 
simonis@6465: // Return the real, user, and system times in seconds from an
simonis@6465: // arbitrary fixed point in the past.
simonis@6465: bool os::getTimesSecs(double* process_real_time,
simonis@6465:                       double* process_user_time,
simonis@6465:                       double* process_system_time) {
simonis@6465:   Unimplemented();
simonis@6465:   return false;
simonis@6465: }
simonis@6465: 
simonis@6465: 
simonis@6465: char * os::local_time_string(char *buf, size_t buflen) {
simonis@6465:   struct tm t;
simonis@6465:   time_t long_time;
simonis@6465:   time(&long_time);
simonis@6465:   localtime_r(&long_time, &t);
simonis@6465:   jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
simonis@6465:                t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
simonis@6465:                t.tm_hour, t.tm_min, t.tm_sec);
simonis@6465:   return buf;
simonis@6465: }
simonis@6465: 
simonis@6465: struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
simonis@6465:   return localtime_r(clock, res);
simonis@6465: }
simonis@6465: 
simonis@6465: ////////////////////////////////////////////////////////////////////////////////
simonis@6465: // runtime exit support
simonis@6465: 
simonis@6465: // Note: os::shutdown() might be called very early during initialization, or
simonis@6465: // called from signal handler. Before adding something to os::shutdown(), make
simonis@6465: // sure it is async-safe and can handle partially initialized VM.
simonis@6465: void os::shutdown() {
simonis@6465: 
simonis@6465:   // allow PerfMemory to attempt cleanup of any persistent resources
simonis@6465:   perfMemory_exit();
simonis@6465: 
simonis@6465:   // needs to remove object in file system
simonis@6465:   AttachListener::abort();
simonis@6465: 
simonis@6465:   // flush buffered output, finish log files
simonis@6465:   ostream_abort();
simonis@6465: 
simonis@6465:   // Check for abort hook
simonis@6465:   abort_hook_t abort_hook = Arguments::abort_hook();
simonis@6465:   if (abort_hook != NULL) {
simonis@6465:     abort_hook();
simonis@6465:   }
simonis@6465: 
simonis@6465: }
simonis@6465: 
simonis@6465: // Note: os::abort() might be called very early during initialization, or
simonis@6465: // called from signal handler. Before adding something to os::abort(), make
simonis@6465: // sure it is async-safe and can handle partially initialized VM.
simonis@6465: void os::abort(bool dump_core) {
simonis@6465:   os::shutdown();
simonis@6465:   if (dump_core) {
simonis@6465: #ifndef PRODUCT
simonis@6465:     fdStream out(defaultStream::output_fd());
simonis@6465:     out.print_raw("Current thread is ");
simonis@6465:     char buf[16];
simonis@6465:     jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
simonis@6465:     out.print_raw_cr(buf);
simonis@6465:     out.print_raw_cr("Dumping core ...");
simonis@6465: #endif
simonis@6465:     ::abort(); // dump core
simonis@6465:   }
simonis@6465: 
simonis@6465:   ::exit(1);
simonis@6465: }
simonis@6465: 
simonis@6465: // Die immediately, no exit hook, no abort hook, no cleanup.
simonis@6465: void os::die() {
simonis@6465:   ::abort();
simonis@6465: }
simonis@6465: 
simonis@6465: // Unused on Aix for now.
simonis@6465: void os::set_error_file(const char *logfile) {}
simonis@6465: 
simonis@6465: 
simonis@6465: // This method is a copy of JDK's sysGetLastErrorString
simonis@6465: // from src/solaris/hpi/src/system_md.c
simonis@6465: 
simonis@6465: size_t os::lasterror(char *buf, size_t len) {
simonis@6465: 
simonis@6465:   if (errno == 0)  return 0;
simonis@6465: 
simonis@6465:   const char *s = ::strerror(errno);
simonis@6465:   size_t n = ::strlen(s);
simonis@6465:   if (n >= len) {
simonis@6465:     n = len - 1;
simonis@6465:   }
simonis@6465:   ::strncpy(buf, s, n);
simonis@6465:   buf[n] = '\0';
simonis@6465:   return n;
simonis@6465: }
simonis@6465: 
simonis@6465: intx os::current_thread_id() { return (intx)pthread_self(); }
simonis@6465: int os::current_process_id() {
simonis@6465: 
simonis@6465:   // This implementation returns a unique pid, the pid of the
simonis@6465:   // launcher thread that starts the vm 'process'.
simonis@6465: 
simonis@6465:   // Under POSIX, getpid() returns the same pid as the
simonis@6465:   // launcher thread rather than a unique pid per thread.
simonis@6465:   // Use gettid() if you want the old pre NPTL behaviour.
simonis@6465: 
simonis@6465:   // if you are looking for the result of a call to getpid() that
simonis@6465:   // returns a unique pid for the calling thread, then look at the
simonis@6465:   // OSThread::thread_id() method in osThread_linux.hpp file
simonis@6465: 
simonis@6465:   return (int)(_initial_pid ? _initial_pid : getpid());
simonis@6465: }
simonis@6465: 
simonis@6465: // DLL functions
simonis@6465: 
simonis@6465: const char* os::dll_file_extension() { return ".so"; }
simonis@6465: 
simonis@6465: // This must be hard coded because it's the system's temporary
simonis@6465: // directory not the java application's temp directory, ala java.io.tmpdir.
simonis@6465: const char* os::get_temp_directory() { return "/tmp"; }
simonis@6465: 
simonis@6465: static bool file_exists(const char* filename) {
simonis@6465:   struct stat statbuf;
simonis@6465:   if (filename == NULL || strlen(filename) == 0) {
simonis@6465:     return false;
simonis@6465:   }
simonis@6465:   return os::stat(filename, &statbuf) == 0;
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::dll_build_name(char* buffer, size_t buflen,
simonis@6465:                         const char* pname, const char* fname) {
simonis@6465:   bool retval = false;
simonis@6465:   // Copied from libhpi
simonis@6465:   const size_t pnamelen = pname ? strlen(pname) : 0;
simonis@6465: 
simonis@6465:   // Return error on buffer overflow.
simonis@6465:   if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
simonis@6465:     *buffer = '\0';
simonis@6465:     return retval;
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (pnamelen == 0) {
simonis@6465:     snprintf(buffer, buflen, "lib%s.so", fname);
simonis@6465:     retval = true;
simonis@6465:   } else if (strchr(pname, *os::path_separator()) != NULL) {
simonis@6465:     int n;
simonis@6465:     char** pelements = split_path(pname, &n);
simonis@6465:     for (int i = 0; i < n; i++) {
simonis@6465:       // Really shouldn't be NULL, but check can't hurt
simonis@6465:       if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
simonis@6465:         continue; // skip the empty path values
simonis@6465:       }
simonis@6465:       snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
simonis@6465:       if (file_exists(buffer)) {
simonis@6465:         retval = true;
simonis@6465:         break;
simonis@6465:       }
simonis@6465:     }
simonis@6465:     // release the storage
simonis@6465:     for (int i = 0; i < n; i++) {
simonis@6465:       if (pelements[i] != NULL) {
simonis@6465:         FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
simonis@6465:       }
simonis@6465:     }
simonis@6465:     if (pelements != NULL) {
simonis@6465:       FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
simonis@6465:     }
simonis@6465:   } else {
simonis@6465:     snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
simonis@6465:     retval = true;
simonis@6465:   }
simonis@6465:   return retval;
simonis@6465: }
simonis@6465: 
simonis@6465: // Check if addr is inside libjvm.so.
simonis@6465: bool os::address_is_in_vm(address addr) {
simonis@6465: 
simonis@6465:   // Input could be a real pc or a function pointer literal. The latter
simonis@6465:   // would be a function descriptor residing in the data segment of a module.
simonis@6465: 
simonis@6465:   const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
simonis@6465:   if (lib) {
simonis@6465:     if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
simonis@6465:       return true;
simonis@6465:     } else {
simonis@6465:       return false;
simonis@6465:     }
simonis@6465:   } else {
simonis@6465:     lib = LoadedLibraries::find_for_data_address(addr);
simonis@6465:     if (lib) {
simonis@6465:       if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
simonis@6465:         return true;
simonis@6465:       } else {
simonis@6465:         return false;
simonis@6465:       }
simonis@6465:     } else {
simonis@6465:       return false;
simonis@6465:     }
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: // Resolve an AIX function descriptor literal to a code pointer.
simonis@6465: // If the input is a valid code pointer to a text segment of a loaded module,
simonis@6465: //   it is returned unchanged.
simonis@6465: // If the input is a valid AIX function descriptor, it is resolved to the
simonis@6465: //   code entry point.
simonis@6465: // If the input is neither a valid function descriptor nor a valid code pointer,
simonis@6465: //   NULL is returned.
simonis@6465: static address resolve_function_descriptor_to_code_pointer(address p) {
simonis@6465: 
simonis@6465:   const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(p);
simonis@6465:   if (lib) {
simonis@6465:     // its a real code pointer
simonis@6465:     return p;
simonis@6465:   } else {
simonis@6465:     lib = LoadedLibraries::find_for_data_address(p);
simonis@6465:     if (lib) {
simonis@6465:       // pointer to data segment, potential function descriptor
simonis@6465:       address code_entry = (address)(((FunctionDescriptor*)p)->entry());
simonis@6465:       if (LoadedLibraries::find_for_text_address(code_entry)) {
simonis@6465:         // Its a function descriptor
simonis@6465:         return code_entry;
simonis@6465:       }
simonis@6465:     }
simonis@6465:   }
simonis@6465:   return NULL;
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::dll_address_to_function_name(address addr, char *buf,
simonis@6465:                                       int buflen, int *offset) {
simonis@6465:   if (offset) {
simonis@6465:     *offset = -1;
simonis@6465:   }
simonis@6465:   if (buf) {
simonis@6465:     buf[0] = '\0';
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Resolve function ptr literals first.
simonis@6465:   addr = resolve_function_descriptor_to_code_pointer(addr);
simonis@6465:   if (!addr) {
simonis@6465:     return false;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Go through Decoder::decode to call getFuncName which reads the name from the traceback table.
simonis@6465:   return Decoder::decode(addr, buf, buflen, offset);
simonis@6465: }
simonis@6465: 
simonis@6465: static int getModuleName(codeptr_t pc,                    // [in] program counter
simonis@6465:                          char* p_name, size_t namelen,    // [out] optional: function name
simonis@6465:                          char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages
simonis@6465:                          ) {
simonis@6465: 
simonis@6465:   // initialize output parameters
simonis@6465:   if (p_name && namelen > 0) {
simonis@6465:     *p_name = '\0';
simonis@6465:   }
simonis@6465:   if (p_errmsg && errmsglen > 0) {
simonis@6465:     *p_errmsg = '\0';
simonis@6465:   }
simonis@6465: 
simonis@6465:   const LoadedLibraryModule* const lib = LoadedLibraries::find_for_text_address((address)pc);
simonis@6465:   if (lib) {
simonis@6465:     if (p_name && namelen > 0) {
simonis@6465:       sprintf(p_name, "%.*s", namelen, lib->get_shortname());
simonis@6465:     }
simonis@6465:     return 0;
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (Verbose) {
simonis@6465:     fprintf(stderr, "pc outside any module");
simonis@6465:   }
simonis@6465: 
simonis@6465:   return -1;
simonis@6465: 
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::dll_address_to_library_name(address addr, char* buf,
simonis@6465:                                      int buflen, int* offset) {
simonis@6465:   if (offset) {
simonis@6465:     *offset = -1;
simonis@6465:   }
simonis@6465:   if (buf) {
simonis@6465:       buf[0] = '\0';
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Resolve function ptr literals first.
simonis@6465:   addr = resolve_function_descriptor_to_code_pointer(addr);
simonis@6465:   if (!addr) {
simonis@6465:     return false;
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (::getModuleName((codeptr_t) addr, buf, buflen, 0, 0) == 0) {
simonis@6465:     return true;
simonis@6465:   }
simonis@6465:   return false;
simonis@6465: }
simonis@6465: 
simonis@6465: // Loads .dll/.so and in case of error it checks if .dll/.so was built
simonis@6465: // for the same architecture as Hotspot is running on
simonis@6465: void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
simonis@6465: 
simonis@6465:   if (ebuf && ebuflen > 0) {
simonis@6465:     ebuf[0] = '\0';
simonis@6465:     ebuf[ebuflen - 1] = '\0';
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (!filename || strlen(filename) == 0) {
simonis@6465:     ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
simonis@6465:     return NULL;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
simonis@6465:   void * result= ::dlopen(filename, RTLD_LAZY);
simonis@6465:   if (result != NULL) {
simonis@6465:     // Reload dll cache. Don't do this in signal handling.
simonis@6465:     LoadedLibraries::reload();
simonis@6465:     return result;
simonis@6465:   } else {
simonis@6465:     // error analysis when dlopen fails
simonis@6465:     const char* const error_report = ::dlerror();
simonis@6465:     if (error_report && ebuf && ebuflen > 0) {
simonis@6465:       snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
simonis@6465:                filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
simonis@6465:     }
simonis@6465:   }
simonis@6465:   return NULL;
simonis@6465: }
simonis@6465: 
simonis@6465: // Glibc-2.0 libdl is not MT safe. If you are building with any glibc,
simonis@6465: // chances are you might want to run the generated bits against glibc-2.0
simonis@6465: // libdl.so, so always use locking for any version of glibc.
simonis@6465: void* os::dll_lookup(void* handle, const char* name) {
simonis@6465:   pthread_mutex_lock(&dl_mutex);
simonis@6465:   void* res = dlsym(handle, name);
simonis@6465:   pthread_mutex_unlock(&dl_mutex);
simonis@6465:   return res;
simonis@6465: }
simonis@6465: 
simonis@6465: void os::print_dll_info(outputStream *st) {
simonis@6465:   st->print_cr("Dynamic libraries:");
simonis@6465:   LoadedLibraries::print(st);
simonis@6465: }
simonis@6465: 
simonis@6465: void os::print_os_info(outputStream* st) {
simonis@6465:   st->print("OS:");
simonis@6465: 
simonis@6465:   st->print("uname:");
simonis@6465:   struct utsname name;
simonis@6465:   uname(&name);
simonis@6465:   st->print(name.sysname); st->print(" ");
simonis@6465:   st->print(name.nodename); st->print(" ");
simonis@6465:   st->print(name.release); st->print(" ");
simonis@6465:   st->print(name.version); st->print(" ");
simonis@6465:   st->print(name.machine);
simonis@6465:   st->cr();
simonis@6465: 
simonis@6465:   // rlimit
simonis@6465:   st->print("rlimit:");
simonis@6465:   struct rlimit rlim;
simonis@6465: 
simonis@6465:   st->print(" STACK ");
simonis@6465:   getrlimit(RLIMIT_STACK, &rlim);
simonis@6465:   if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
simonis@6465:   else st->print("%uk", rlim.rlim_cur >> 10);
simonis@6465: 
simonis@6465:   st->print(", CORE ");
simonis@6465:   getrlimit(RLIMIT_CORE, &rlim);
simonis@6465:   if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
simonis@6465:   else st->print("%uk", rlim.rlim_cur >> 10);
simonis@6465: 
simonis@6465:   st->print(", NPROC ");
simonis@6465:   st->print("%d", sysconf(_SC_CHILD_MAX));
simonis@6465: 
simonis@6465:   st->print(", NOFILE ");
simonis@6465:   getrlimit(RLIMIT_NOFILE, &rlim);
simonis@6465:   if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
simonis@6465:   else st->print("%d", rlim.rlim_cur);
simonis@6465: 
simonis@6465:   st->print(", AS ");
simonis@6465:   getrlimit(RLIMIT_AS, &rlim);
simonis@6465:   if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
simonis@6465:   else st->print("%uk", rlim.rlim_cur >> 10);
simonis@6465: 
simonis@6465:   // Print limits on DATA, because it limits the C-heap.
simonis@6465:   st->print(", DATA ");
simonis@6465:   getrlimit(RLIMIT_DATA, &rlim);
simonis@6465:   if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
simonis@6465:   else st->print("%uk", rlim.rlim_cur >> 10);
simonis@6465:   st->cr();
simonis@6465: 
simonis@6465:   // load average
simonis@6465:   st->print("load average:");
simonis@6465:   double loadavg[3] = {-1.L, -1.L, -1.L};
simonis@6465:   os::loadavg(loadavg, 3);
simonis@6465:   st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
simonis@6465:   st->cr();
simonis@6465: }
simonis@6465: 
simonis@6465: void os::print_memory_info(outputStream* st) {
simonis@6465: 
simonis@6465:   st->print_cr("Memory:");
simonis@6465: 
simonis@6465:   st->print_cr("  default page size: %s", describe_pagesize(os::vm_page_size()));
simonis@6465:   st->print_cr("  default stack page size: %s", describe_pagesize(os::vm_page_size()));
simonis@6465:   st->print_cr("  default shm page size: %s", describe_pagesize(os::Aix::shm_default_page_size()));
simonis@6465:   st->print_cr("  can use 64K pages dynamically: %s", (os::Aix::can_use_64K_pages() ? "yes" :"no"));
simonis@6465:   st->print_cr("  can use 16M pages dynamically: %s", (os::Aix::can_use_16M_pages() ? "yes" :"no"));
simonis@6465:   if (g_multipage_error != 0) {
simonis@6465:     st->print_cr("  multipage error: %d", g_multipage_error);
simonis@6465:   }
simonis@6465: 
simonis@6465:   // print out LDR_CNTRL because it affects the default page sizes
simonis@6465:   const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
simonis@6465:   st->print_cr("  LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
simonis@6465: 
simonis@6465:   const char* const extshm = ::getenv("EXTSHM");
simonis@6465:   st->print_cr("  EXTSHM=%s.", extshm ? extshm : "<unset>");
simonis@6465: 
simonis@6465:   // Call os::Aix::get_meminfo() to retrieve memory statistics.
simonis@6465:   os::Aix::meminfo_t mi;
simonis@6465:   if (os::Aix::get_meminfo(&mi)) {
simonis@6465:     char buffer[256];
simonis@6465:     if (os::Aix::on_aix()) {
simonis@6465:       jio_snprintf(buffer, sizeof(buffer),
simonis@6465:                    "  physical total : %llu\n"
simonis@6465:                    "  physical free  : %llu\n"
simonis@6465:                    "  swap total     : %llu\n"
simonis@6465:                    "  swap free      : %llu\n",
simonis@6465:                    mi.real_total,
simonis@6465:                    mi.real_free,
simonis@6465:                    mi.pgsp_total,
simonis@6465:                    mi.pgsp_free);
simonis@6465:     } else {
simonis@6465:       Unimplemented();
simonis@6465:     }
simonis@6465:     st->print_raw(buffer);
simonis@6465:   } else {
simonis@6465:     st->print_cr("  (no more information available)");
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: void os::pd_print_cpu_info(outputStream* st) {
simonis@6465:   // cpu
simonis@6465:   st->print("CPU:");
simonis@6465:   st->print("total %d", os::processor_count());
simonis@6465:   // It's not safe to query number of active processors after crash
simonis@6465:   // st->print("(active %d)", os::active_processor_count());
simonis@6465:   st->print(" %s", VM_Version::cpu_features());
simonis@6465:   st->cr();
simonis@6465: }
simonis@6465: 
simonis@6465: void os::print_siginfo(outputStream* st, void* siginfo) {
simonis@6465:   // Use common posix version.
simonis@6465:   os::Posix::print_siginfo_brief(st, (const siginfo_t*) siginfo);
simonis@6465:   st->cr();
simonis@6465: }
simonis@6465: 
simonis@6465: 
simonis@6465: static void print_signal_handler(outputStream* st, int sig,
simonis@6465:                                  char* buf, size_t buflen);
simonis@6465: 
simonis@6465: void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
simonis@6465:   st->print_cr("Signal Handlers:");
simonis@6465:   print_signal_handler(st, SIGSEGV, buf, buflen);
simonis@6465:   print_signal_handler(st, SIGBUS , buf, buflen);
simonis@6465:   print_signal_handler(st, SIGFPE , buf, buflen);
simonis@6465:   print_signal_handler(st, SIGPIPE, buf, buflen);
simonis@6465:   print_signal_handler(st, SIGXFSZ, buf, buflen);
simonis@6465:   print_signal_handler(st, SIGILL , buf, buflen);
simonis@6465:   print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
simonis@6465:   print_signal_handler(st, SR_signum, buf, buflen);
simonis@6465:   print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
simonis@6465:   print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
simonis@6465:   print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
simonis@6465:   print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
simonis@6465:   print_signal_handler(st, SIGTRAP, buf, buflen);
simonis@6465:   print_signal_handler(st, SIGDANGER, buf, buflen);
simonis@6465: }
simonis@6465: 
simonis@6465: static char saved_jvm_path[MAXPATHLEN] = {0};
simonis@6465: 
simonis@6465: // Find the full path to the current module, libjvm.so or libjvm_g.so
simonis@6465: void os::jvm_path(char *buf, jint buflen) {
simonis@6465:   // Error checking.
simonis@6465:   if (buflen < MAXPATHLEN) {
simonis@6465:     assert(false, "must use a large-enough buffer");
simonis@6465:     buf[0] = '\0';
simonis@6465:     return;
simonis@6465:   }
simonis@6465:   // Lazy resolve the path to current module.
simonis@6465:   if (saved_jvm_path[0] != 0) {
simonis@6465:     strcpy(buf, saved_jvm_path);
simonis@6465:     return;
simonis@6465:   }
simonis@6465: 
simonis@6465:   Dl_info dlinfo;
simonis@6465:   int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
simonis@6465:   assert(ret != 0, "cannot locate libjvm");
simonis@6465:   char* rp = realpath((char *)dlinfo.dli_fname, buf);
simonis@6465:   assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
simonis@6465: 
simonis@6465:   strcpy(saved_jvm_path, buf);
simonis@6465: }
simonis@6465: 
simonis@6465: void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
simonis@6465:   // no prefix required, not even "_"
simonis@6465: }
simonis@6465: 
simonis@6465: void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
simonis@6465:   // no suffix required
simonis@6465: }
simonis@6465: 
simonis@6465: ////////////////////////////////////////////////////////////////////////////////
simonis@6465: // sun.misc.Signal support
simonis@6465: 
simonis@6465: static volatile jint sigint_count = 0;
simonis@6465: 
simonis@6465: static void
simonis@6465: UserHandler(int sig, void *siginfo, void *context) {
simonis@6465:   // 4511530 - sem_post is serialized and handled by the manager thread. When
simonis@6465:   // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
simonis@6465:   // don't want to flood the manager thread with sem_post requests.
simonis@6465:   if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
simonis@6465:     return;
simonis@6465: 
simonis@6465:   // Ctrl-C is pressed during error reporting, likely because the error
simonis@6465:   // handler fails to abort. Let VM die immediately.
simonis@6465:   if (sig == SIGINT && is_error_reported()) {
simonis@6465:     os::die();
simonis@6465:   }
simonis@6465: 
simonis@6465:   os::signal_notify(sig);
simonis@6465: }
simonis@6465: 
simonis@6465: void* os::user_handler() {
simonis@6465:   return CAST_FROM_FN_PTR(void*, UserHandler);
simonis@6465: }
simonis@6465: 
simonis@6465: extern "C" {
simonis@6465:   typedef void (*sa_handler_t)(int);
simonis@6465:   typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
simonis@6465: }
simonis@6465: 
simonis@6465: void* os::signal(int signal_number, void* handler) {
simonis@6465:   struct sigaction sigAct, oldSigAct;
simonis@6465: 
simonis@6465:   sigfillset(&(sigAct.sa_mask));
simonis@6465: 
simonis@6465:   // Do not block out synchronous signals in the signal handler.
simonis@6465:   // Blocking synchronous signals only makes sense if you can really
simonis@6465:   // be sure that those signals won't happen during signal handling,
simonis@6465:   // when the blocking applies.  Normal signal handlers are lean and
simonis@6465:   // do not cause signals. But our signal handlers tend to be "risky"
simonis@6465:   // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
simonis@6465:   // On AIX, PASE there was a case where a SIGSEGV happened, followed
simonis@6465:   // by a SIGILL, which was blocked due to the signal mask. The process
simonis@6465:   // just hung forever. Better to crash from a secondary signal than to hang.
simonis@6465:   sigdelset(&(sigAct.sa_mask), SIGSEGV);
simonis@6465:   sigdelset(&(sigAct.sa_mask), SIGBUS);
simonis@6465:   sigdelset(&(sigAct.sa_mask), SIGILL);
simonis@6465:   sigdelset(&(sigAct.sa_mask), SIGFPE);
simonis@6465:   sigdelset(&(sigAct.sa_mask), SIGTRAP);
simonis@6465: 
simonis@6465:   sigAct.sa_flags   = SA_RESTART|SA_SIGINFO;
simonis@6465: 
simonis@6465:   sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
simonis@6465: 
simonis@6465:   if (sigaction(signal_number, &sigAct, &oldSigAct)) {
simonis@6465:     // -1 means registration failed
simonis@6465:     return (void *)-1;
simonis@6465:   }
simonis@6465: 
simonis@6465:   return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
simonis@6465: }
simonis@6465: 
simonis@6465: void os::signal_raise(int signal_number) {
simonis@6465:   ::raise(signal_number);
simonis@6465: }
simonis@6465: 
simonis@6465: //
simonis@6465: // The following code is moved from os.cpp for making this
simonis@6465: // code platform specific, which it is by its very nature.
simonis@6465: //
simonis@6465: 
simonis@6465: // Will be modified when max signal is changed to be dynamic
simonis@6465: int os::sigexitnum_pd() {
simonis@6465:   return NSIG;
simonis@6465: }
simonis@6465: 
simonis@6465: // a counter for each possible signal value
simonis@6465: static volatile jint pending_signals[NSIG+1] = { 0 };
simonis@6465: 
simonis@6465: // Linux(POSIX) specific hand shaking semaphore.
simonis@6465: static sem_t sig_sem;
simonis@6465: 
simonis@6465: void os::signal_init_pd() {
simonis@6465:   // Initialize signal structures
simonis@6465:   ::memset((void*)pending_signals, 0, sizeof(pending_signals));
simonis@6465: 
simonis@6465:   // Initialize signal semaphore
simonis@6465:   int rc = ::sem_init(&sig_sem, 0, 0);
simonis@6465:   guarantee(rc != -1, "sem_init failed");
simonis@6465: }
simonis@6465: 
simonis@6465: void os::signal_notify(int sig) {
simonis@6465:   Atomic::inc(&pending_signals[sig]);
simonis@6465:   ::sem_post(&sig_sem);
simonis@6465: }
simonis@6465: 
simonis@6465: static int check_pending_signals(bool wait) {
simonis@6465:   Atomic::store(0, &sigint_count);
simonis@6465:   for (;;) {
simonis@6465:     for (int i = 0; i < NSIG + 1; i++) {
simonis@6465:       jint n = pending_signals[i];
simonis@6465:       if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
simonis@6465:         return i;
simonis@6465:       }
simonis@6465:     }
simonis@6465:     if (!wait) {
simonis@6465:       return -1;
simonis@6465:     }
simonis@6465:     JavaThread *thread = JavaThread::current();
simonis@6465:     ThreadBlockInVM tbivm(thread);
simonis@6465: 
simonis@6465:     bool threadIsSuspended;
simonis@6465:     do {
simonis@6465:       thread->set_suspend_equivalent();
simonis@6465:       // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
simonis@6465: 
simonis@6465:       ::sem_wait(&sig_sem);
simonis@6465: 
simonis@6465:       // were we externally suspended while we were waiting?
simonis@6465:       threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
simonis@6465:       if (threadIsSuspended) {
simonis@6465:         //
simonis@6465:         // The semaphore has been incremented, but while we were waiting
simonis@6465:         // another thread suspended us. We don't want to continue running
simonis@6465:         // while suspended because that would surprise the thread that
simonis@6465:         // suspended us.
simonis@6465:         //
simonis@6465:         ::sem_post(&sig_sem);
simonis@6465: 
simonis@6465:         thread->java_suspend_self();
simonis@6465:       }
simonis@6465:     } while (threadIsSuspended);
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: int os::signal_lookup() {
simonis@6465:   return check_pending_signals(false);
simonis@6465: }
simonis@6465: 
simonis@6465: int os::signal_wait() {
simonis@6465:   return check_pending_signals(true);
simonis@6465: }
simonis@6465: 
simonis@6465: ////////////////////////////////////////////////////////////////////////////////
simonis@6465: // Virtual Memory
simonis@6465: 
simonis@6465: // AddrRange describes an immutable address range
simonis@6465: //
simonis@6465: // This is a helper class for the 'shared memory bookkeeping' below.
simonis@6465: class AddrRange {
simonis@6465:   friend class ShmBkBlock;
simonis@6465: 
simonis@6465:   char* _start;
simonis@6465:   size_t _size;
simonis@6465: 
simonis@6465: public:
simonis@6465: 
simonis@6465:   AddrRange(char* start, size_t size)
simonis@6465:     : _start(start), _size(size)
simonis@6465:   {}
simonis@6465: 
simonis@6465:   AddrRange(const AddrRange& r)
simonis@6465:     : _start(r.start()), _size(r.size())
simonis@6465:   {}
simonis@6465: 
simonis@6465:   char* start() const { return _start; }
simonis@6465:   size_t size() const { return _size; }
simonis@6465:   char* end() const { return _start + _size; }
simonis@6465:   bool is_empty() const { return _size == 0 ? true : false; }
simonis@6465: 
simonis@6465:   static AddrRange empty_range() { return AddrRange(NULL, 0); }
simonis@6465: 
simonis@6465:   bool contains(const char* p) const {
simonis@6465:     return start() <= p && end() > p;
simonis@6465:   }
simonis@6465: 
simonis@6465:   bool contains(const AddrRange& range) const {
simonis@6465:     return start() <= range.start() && end() >= range.end();
simonis@6465:   }
simonis@6465: 
simonis@6465:   bool intersects(const AddrRange& range) const {
simonis@6465:     return (range.start() <= start() && range.end() > start()) ||
simonis@6465:            (range.start() < end() && range.end() >= end()) ||
simonis@6465:            contains(range);
simonis@6465:   }
simonis@6465: 
simonis@6465:   bool is_same_range(const AddrRange& range) const {
simonis@6465:     return start() == range.start() && size() == range.size();
simonis@6465:   }
simonis@6465: 
simonis@6465:   // return the closest inside range consisting of whole pages
simonis@6465:   AddrRange find_closest_aligned_range(size_t pagesize) const {
simonis@6465:     if (pagesize == 0 || is_empty()) {
simonis@6465:       return empty_range();
simonis@6465:     }
simonis@6465:     char* const from = (char*)align_size_up((intptr_t)_start, pagesize);
simonis@6465:     char* const to = (char*)align_size_down((intptr_t)end(), pagesize);
simonis@6465:     if (from > to) {
simonis@6465:       return empty_range();
simonis@6465:     }
simonis@6465:     return AddrRange(from, to - from);
simonis@6465:   }
simonis@6465: };
simonis@6465: 
simonis@6465: ////////////////////////////////////////////////////////////////////////////
simonis@6465: // shared memory bookkeeping
simonis@6465: //
simonis@6465: // the os::reserve_memory() API and friends hand out different kind of memory, depending
simonis@6465: // on need and circumstances. Memory may be allocated with mmap() or with shmget/shmat.
simonis@6465: //
simonis@6465: // But these memory types have to be treated differently. For example, to uncommit
simonis@6465: // mmap-based memory, msync(MS_INVALIDATE) is needed, to uncommit shmat-based memory,
simonis@6465: // disclaim64() is needed.
simonis@6465: //
simonis@6465: // Therefore we need to keep track of the allocated memory segments and their
simonis@6465: // properties.
simonis@6465: 
simonis@6465: // ShmBkBlock: base class for all blocks in the shared memory bookkeeping
simonis@6465: class ShmBkBlock {
simonis@6465: 
simonis@6465:   ShmBkBlock* _next;
simonis@6465: 
simonis@6465: protected:
simonis@6465: 
simonis@6465:   AddrRange _range;
simonis@6465:   const size_t _pagesize;
simonis@6465:   const bool _pinned;
simonis@6465: 
simonis@6465: public:
simonis@6465: 
simonis@6465:   ShmBkBlock(AddrRange range, size_t pagesize, bool pinned)
simonis@6465:     : _range(range), _pagesize(pagesize), _pinned(pinned) , _next(NULL) {
simonis@6465: 
simonis@6465:     assert(_pagesize == SIZE_4K || _pagesize == SIZE_64K || _pagesize == SIZE_16M, "invalid page size");
simonis@6465:     assert(!_range.is_empty(), "invalid range");
simonis@6465:   }
simonis@6465: 
simonis@6465:   virtual void print(outputStream* st) const {
simonis@6465:     st->print("0x%p ... 0x%p (%llu) - %d %s pages - %s",
simonis@6465:               _range.start(), _range.end(), _range.size(),
simonis@6465:               _range.size() / _pagesize, describe_pagesize(_pagesize),
simonis@6465:               _pinned ? "pinned" : "");
simonis@6465:   }
simonis@6465: 
simonis@6465:   enum Type { MMAP, SHMAT };
simonis@6465:   virtual Type getType() = 0;
simonis@6465: 
simonis@6465:   char* base() const { return _range.start(); }
simonis@6465:   size_t size() const { return _range.size(); }
simonis@6465: 
simonis@6465:   void setAddrRange(AddrRange range) {
simonis@6465:     _range = range;
simonis@6465:   }
simonis@6465: 
simonis@6465:   bool containsAddress(const char* p) const {
simonis@6465:     return _range.contains(p);
simonis@6465:   }
simonis@6465: 
simonis@6465:   bool containsRange(const char* p, size_t size) const {
simonis@6465:     return _range.contains(AddrRange((char*)p, size));
simonis@6465:   }
simonis@6465: 
simonis@6465:   bool isSameRange(const char* p, size_t size) const {
simonis@6465:     return _range.is_same_range(AddrRange((char*)p, size));
simonis@6465:   }
simonis@6465: 
simonis@6465:   virtual bool disclaim(char* p, size_t size) = 0;
simonis@6465:   virtual bool release() = 0;
simonis@6465: 
simonis@6465:   // blocks live in a list.
simonis@6465:   ShmBkBlock* next() const { return _next; }
simonis@6465:   void set_next(ShmBkBlock* blk) { _next = blk; }
simonis@6465: 
simonis@6465: }; // end: ShmBkBlock
simonis@6465: 
simonis@6465: 
simonis@6465: // ShmBkMappedBlock: describes an block allocated with mmap()
simonis@6465: class ShmBkMappedBlock : public ShmBkBlock {
simonis@6465: public:
simonis@6465: 
simonis@6465:   ShmBkMappedBlock(AddrRange range)
simonis@6465:     : ShmBkBlock(range, SIZE_4K, false) {} // mmap: always 4K, never pinned
simonis@6465: 
simonis@6465:   void print(outputStream* st) const {
simonis@6465:     ShmBkBlock::print(st);
simonis@6465:     st->print_cr(" - mmap'ed");
simonis@6465:   }
simonis@6465: 
simonis@6465:   Type getType() {
simonis@6465:     return MMAP;
simonis@6465:   }
simonis@6465: 
simonis@6465:   bool disclaim(char* p, size_t size) {
simonis@6465: 
simonis@6465:     AddrRange r(p, size);
simonis@6465: 
simonis@6465:     guarantee(_range.contains(r), "invalid disclaim");
simonis@6465: 
simonis@6465:     // only disclaim whole ranges.
simonis@6465:     const AddrRange r2 = r.find_closest_aligned_range(_pagesize);
simonis@6465:     if (r2.is_empty()) {
simonis@6465:       return true;
simonis@6465:     }
simonis@6465: 
simonis@6465:     const int rc = ::msync(r2.start(), r2.size(), MS_INVALIDATE);
simonis@6465: 
simonis@6465:     if (rc != 0) {
simonis@6465:       warning("msync(0x%p, %llu, MS_INVALIDATE) failed (%d)\n", r2.start(), r2.size(), errno);
simonis@6465:     }
simonis@6465: 
simonis@6465:     return rc == 0 ? true : false;
simonis@6465:   }
simonis@6465: 
simonis@6465:   bool release() {
simonis@6465:     // mmap'ed blocks are released using munmap
simonis@6465:     if (::munmap(_range.start(), _range.size()) != 0) {
simonis@6465:       warning("munmap(0x%p, %llu) failed (%d)\n", _range.start(), _range.size(), errno);
simonis@6465:       return false;
simonis@6465:     }
simonis@6465:     return true;
simonis@6465:   }
simonis@6465: }; // end: ShmBkMappedBlock
simonis@6465: 
simonis@6465: // ShmBkShmatedBlock: describes an block allocated with shmget/shmat()
simonis@6465: class ShmBkShmatedBlock : public ShmBkBlock {
simonis@6465: public:
simonis@6465: 
simonis@6465:   ShmBkShmatedBlock(AddrRange range, size_t pagesize, bool pinned)
simonis@6465:     : ShmBkBlock(range, pagesize, pinned) {}
simonis@6465: 
simonis@6465:   void print(outputStream* st) const {
simonis@6465:     ShmBkBlock::print(st);
simonis@6465:     st->print_cr(" - shmat'ed");
simonis@6465:   }
simonis@6465: 
simonis@6465:   Type getType() {
simonis@6465:     return SHMAT;
simonis@6465:   }
simonis@6465: 
simonis@6465:   bool disclaim(char* p, size_t size) {
simonis@6465: 
simonis@6465:     AddrRange r(p, size);
simonis@6465: 
simonis@6465:     if (_pinned) {
simonis@6465:       return true;
simonis@6465:     }
simonis@6465: 
simonis@6465:     // shmat'ed blocks are disclaimed using disclaim64
simonis@6465:     guarantee(_range.contains(r), "invalid disclaim");
simonis@6465: 
simonis@6465:     // only disclaim whole ranges.
simonis@6465:     const AddrRange r2 = r.find_closest_aligned_range(_pagesize);
simonis@6465:     if (r2.is_empty()) {
simonis@6465:       return true;
simonis@6465:     }
simonis@6465: 
simonis@6465:     const bool rc = my_disclaim64(r2.start(), r2.size());
simonis@6465: 
simonis@6465:     if (Verbose && !rc) {
simonis@6465:       warning("failed to disclaim shm %p-%p\n", r2.start(), r2.end());
simonis@6465:     }
simonis@6465: 
simonis@6465:     return rc;
simonis@6465:   }
simonis@6465: 
simonis@6465:   bool release() {
simonis@6465:     bool rc = false;
simonis@6465:     if (::shmdt(_range.start()) != 0) {
simonis@6465:       warning("shmdt(0x%p) failed (%d)\n", _range.start(), errno);
simonis@6465:     } else {
simonis@6465:       rc = true;
simonis@6465:     }
simonis@6465:     return rc;
simonis@6465:   }
simonis@6465: 
simonis@6465: }; // end: ShmBkShmatedBlock
simonis@6465: 
simonis@6465: static ShmBkBlock* g_shmbk_list = NULL;
simonis@6465: static volatile jint g_shmbk_table_lock = 0;
simonis@6465: 
simonis@6465: // keep some usage statistics
simonis@6465: static struct {
simonis@6465:   int nodes;    // number of nodes in list
simonis@6465:   size_t bytes; // reserved - not committed - bytes.
simonis@6465:   int reserves; // how often reserve was called
simonis@6465:   int lookups;  // how often a lookup was made
simonis@6465: } g_shmbk_stats = { 0, 0, 0, 0 };
simonis@6465: 
simonis@6465: // add information about a shared memory segment to the bookkeeping
simonis@6465: static void shmbk_register(ShmBkBlock* p_block) {
simonis@6465:   guarantee(p_block, "logic error");
simonis@6465:   p_block->set_next(g_shmbk_list);
simonis@6465:   g_shmbk_list = p_block;
simonis@6465:   g_shmbk_stats.reserves ++;
simonis@6465:   g_shmbk_stats.bytes += p_block->size();
simonis@6465:   g_shmbk_stats.nodes ++;
simonis@6465: }
simonis@6465: 
simonis@6465: // remove information about a shared memory segment by its starting address
simonis@6465: static void shmbk_unregister(ShmBkBlock* p_block) {
simonis@6465:   ShmBkBlock* p = g_shmbk_list;
simonis@6465:   ShmBkBlock* prev = NULL;
simonis@6465:   while (p) {
simonis@6465:     if (p == p_block) {
simonis@6465:       if (prev) {
simonis@6465:         prev->set_next(p->next());
simonis@6465:       } else {
simonis@6465:         g_shmbk_list = p->next();
simonis@6465:       }
simonis@6465:       g_shmbk_stats.nodes --;
simonis@6465:       g_shmbk_stats.bytes -= p->size();
simonis@6465:       return;
simonis@6465:     }
simonis@6465:     prev = p;
simonis@6465:     p = p->next();
simonis@6465:   }
simonis@6465:   assert(false, "should not happen");
simonis@6465: }
simonis@6465: 
simonis@6465: // given a pointer, return shared memory bookkeeping record for the segment it points into
simonis@6465: // using the returned block info must happen under lock protection
simonis@6465: static ShmBkBlock* shmbk_find_by_containing_address(const char* addr) {
simonis@6465:   g_shmbk_stats.lookups ++;
simonis@6465:   ShmBkBlock* p = g_shmbk_list;
simonis@6465:   while (p) {
simonis@6465:     if (p->containsAddress(addr)) {
simonis@6465:       return p;
simonis@6465:     }
simonis@6465:     p = p->next();
simonis@6465:   }
simonis@6465:   return NULL;
simonis@6465: }
simonis@6465: 
simonis@6465: // dump all information about all memory segments allocated with os::reserve_memory()
simonis@6465: void shmbk_dump_info() {
simonis@6465:   tty->print_cr("-- shared mem bookkeeping (alive: %d segments, %llu bytes, "
simonis@6465:     "total reserves: %d total lookups: %d)",
simonis@6465:     g_shmbk_stats.nodes, g_shmbk_stats.bytes, g_shmbk_stats.reserves, g_shmbk_stats.lookups);
simonis@6465:   const ShmBkBlock* p = g_shmbk_list;
simonis@6465:   int i = 0;
simonis@6465:   while (p) {
simonis@6465:     p->print(tty);
simonis@6465:     p = p->next();
simonis@6465:     i ++;
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: #define LOCK_SHMBK     { ThreadCritical _LOCK_SHMBK;
simonis@6465: #define UNLOCK_SHMBK   }
simonis@6465: 
simonis@6465: // End: shared memory bookkeeping
simonis@6465: ////////////////////////////////////////////////////////////////////////////////////////////////////
simonis@6465: 
simonis@6465: int os::vm_page_size() {
simonis@6465:   // Seems redundant as all get out
simonis@6465:   assert(os::Aix::page_size() != -1, "must call os::init");
simonis@6465:   return os::Aix::page_size();
simonis@6465: }
simonis@6465: 
simonis@6465: // Aix allocates memory by pages.
simonis@6465: int os::vm_allocation_granularity() {
simonis@6465:   assert(os::Aix::page_size() != -1, "must call os::init");
simonis@6465:   return os::Aix::page_size();
simonis@6465: }
simonis@6465: 
simonis@6465: int os::Aix::commit_memory_impl(char* addr, size_t size, bool exec) {
simonis@6465: 
simonis@6465:   // Commit is a noop. There is no explicit commit
simonis@6465:   // needed on AIX. Memory is committed when touched.
simonis@6465:   //
simonis@6465:   // Debug : check address range for validity
simonis@6465: #ifdef ASSERT
simonis@6465:   LOCK_SHMBK
simonis@6465:     ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
simonis@6465:     if (!block) {
simonis@6465:       fprintf(stderr, "invalid pointer: " INTPTR_FORMAT "\n", addr);
simonis@6465:       shmbk_dump_info();
simonis@6465:       assert(false, "invalid pointer");
simonis@6465:       return false;
simonis@6465:     } else if (!block->containsRange(addr, size)) {
simonis@6465:       fprintf(stderr, "invalid range: " INTPTR_FORMAT " .. " INTPTR_FORMAT "\n", addr, addr + size);
simonis@6465:       shmbk_dump_info();
simonis@6465:       assert(false, "invalid range");
simonis@6465:       return false;
simonis@6465:     }
simonis@6465:   UNLOCK_SHMBK
simonis@6465: #endif // ASSERT
simonis@6465: 
simonis@6465:   return 0;
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
simonis@6465:   return os::Aix::commit_memory_impl(addr, size, exec) == 0;
simonis@6465: }
simonis@6465: 
simonis@6465: void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
simonis@6465:                                   const char* mesg) {
simonis@6465:   assert(mesg != NULL, "mesg must be specified");
simonis@6465:   os::Aix::commit_memory_impl(addr, size, exec);
simonis@6465: }
simonis@6465: 
simonis@6465: int os::Aix::commit_memory_impl(char* addr, size_t size,
simonis@6465:                                 size_t alignment_hint, bool exec) {
simonis@6465:   return os::Aix::commit_memory_impl(addr, size, exec);
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
simonis@6465:                           bool exec) {
simonis@6465:   return os::Aix::commit_memory_impl(addr, size, alignment_hint, exec) == 0;
simonis@6465: }
simonis@6465: 
simonis@6465: void os::pd_commit_memory_or_exit(char* addr, size_t size,
simonis@6465:                                   size_t alignment_hint, bool exec,
simonis@6465:                                   const char* mesg) {
simonis@6465:   os::Aix::commit_memory_impl(addr, size, alignment_hint, exec);
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::pd_uncommit_memory(char* addr, size_t size) {
simonis@6465: 
simonis@6465:   // Delegate to ShmBkBlock class which knows how to uncommit its memory.
simonis@6465: 
simonis@6465:   bool rc = false;
simonis@6465:   LOCK_SHMBK
simonis@6465:     ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
simonis@6465:     if (!block) {
simonis@6465:       fprintf(stderr, "invalid pointer: 0x%p.\n", addr);
simonis@6465:       shmbk_dump_info();
simonis@6465:       assert(false, "invalid pointer");
simonis@6465:       return false;
simonis@6465:     } else if (!block->containsRange(addr, size)) {
simonis@6465:       fprintf(stderr, "invalid range: 0x%p .. 0x%p.\n", addr, addr + size);
simonis@6465:       shmbk_dump_info();
simonis@6465:       assert(false, "invalid range");
simonis@6465:       return false;
simonis@6465:     }
simonis@6465:     rc = block->disclaim(addr, size);
simonis@6465:   UNLOCK_SHMBK
simonis@6465: 
simonis@6465:   if (Verbose && !rc) {
simonis@6465:     warning("failed to disclaim 0x%p .. 0x%p (0x%llX bytes).", addr, addr + size, size);
simonis@6465:   }
simonis@6465:   return rc;
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
simonis@6465:   return os::guard_memory(addr, size);
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::remove_stack_guard_pages(char* addr, size_t size) {
simonis@6465:   return os::unguard_memory(addr, size);
simonis@6465: }
simonis@6465: 
simonis@6465: void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
simonis@6465: }
simonis@6465: 
simonis@6465: void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
simonis@6465: }
simonis@6465: 
simonis@6465: void os::numa_make_global(char *addr, size_t bytes) {
simonis@6465: }
simonis@6465: 
simonis@6465: void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::numa_topology_changed() {
simonis@6465:   return false;
simonis@6465: }
simonis@6465: 
simonis@6465: size_t os::numa_get_groups_num() {
simonis@6465:   return 1;
simonis@6465: }
simonis@6465: 
simonis@6465: int os::numa_get_group_id() {
simonis@6465:   return 0;
simonis@6465: }
simonis@6465: 
simonis@6465: size_t os::numa_get_leaf_groups(int *ids, size_t size) {
simonis@6465:   if (size > 0) {
simonis@6465:     ids[0] = 0;
simonis@6465:     return 1;
simonis@6465:   }
simonis@6465:   return 0;
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::get_page_info(char *start, page_info* info) {
simonis@6465:   return false;
simonis@6465: }
simonis@6465: 
simonis@6465: char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
simonis@6465:   return end;
simonis@6465: }
simonis@6465: 
simonis@6465: // Flags for reserve_shmatted_memory:
simonis@6465: #define RESSHM_WISHADDR_OR_FAIL                     1
simonis@6465: #define RESSHM_TRY_16M_PAGES                        2
simonis@6465: #define RESSHM_16M_PAGES_OR_FAIL                    4
simonis@6465: 
simonis@6465: // Result of reserve_shmatted_memory:
simonis@6465: struct shmatted_memory_info_t {
simonis@6465:   char* addr;
simonis@6465:   size_t pagesize;
simonis@6465:   bool pinned;
simonis@6465: };
simonis@6465: 
simonis@6465: // Reserve a section of shmatted memory.
simonis@6465: // params:
simonis@6465: // bytes [in]: size of memory, in bytes
simonis@6465: // requested_addr [in]: wish address.
simonis@6465: //                      NULL = no wish.
simonis@6465: //                      If RESSHM_WISHADDR_OR_FAIL is set in flags and wish address cannot
simonis@6465: //                      be obtained, function will fail. Otherwise wish address is treated as hint and
simonis@6465: //                      another pointer is returned.
simonis@6465: // flags [in]:          some flags. Valid flags are:
simonis@6465: //                      RESSHM_WISHADDR_OR_FAIL - fail if wish address is given and cannot be obtained.
simonis@6465: //                      RESSHM_TRY_16M_PAGES - try to allocate from 16M page pool
simonis@6465: //                          (requires UseLargePages and Use16MPages)
simonis@6465: //                      RESSHM_16M_PAGES_OR_FAIL - if you cannot allocate from 16M page pool, fail.
simonis@6465: //                          Otherwise any other page size will do.
simonis@6465: // p_info [out] :       holds information about the created shared memory segment.
simonis@6465: static bool reserve_shmatted_memory(size_t bytes, char* requested_addr, int flags, shmatted_memory_info_t* p_info) {
simonis@6465: 
simonis@6465:   assert(p_info, "parameter error");
simonis@6465: 
simonis@6465:   // init output struct.
simonis@6465:   p_info->addr = NULL;
simonis@6465: 
simonis@6465:   // neither should we be here for EXTSHM=ON.
simonis@6465:   if (os::Aix::extshm()) {
simonis@6465:     ShouldNotReachHere();
simonis@6465:   }
simonis@6465: 
simonis@6465:   // extract flags. sanity checks.
simonis@6465:   const bool wishaddr_or_fail =
simonis@6465:     flags & RESSHM_WISHADDR_OR_FAIL;
simonis@6465:   const bool try_16M_pages =
simonis@6465:     flags & RESSHM_TRY_16M_PAGES;
simonis@6465:   const bool f16M_pages_or_fail =
simonis@6465:     flags & RESSHM_16M_PAGES_OR_FAIL;
simonis@6465: 
simonis@6465:   // first check: if a wish address is given and it is mandatory, but not aligned to segment boundary,
simonis@6465:   // shmat will fail anyway, so save some cycles by failing right away
simonis@6465:   if (requested_addr && ((uintptr_t)requested_addr % SIZE_256M == 0)) {
simonis@6465:     if (wishaddr_or_fail) {
simonis@6465:       return false;
simonis@6465:     } else {
simonis@6465:       requested_addr = NULL;
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   char* addr = NULL;
simonis@6465: 
simonis@6465:   // Align size of shm up to the largest possible page size, to avoid errors later on when we try to change
simonis@6465:   // pagesize dynamically.
simonis@6465:   const size_t size = align_size_up(bytes, SIZE_16M);
simonis@6465: 
simonis@6465:   // reserve the shared segment
simonis@6465:   int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
simonis@6465:   if (shmid == -1) {
simonis@6465:     warning("shmget(.., %lld, ..) failed (errno: %d).", size, errno);
simonis@6465:     return false;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Important note:
simonis@6465:   // It is very important that we, upon leaving this function, do not leave a shm segment alive.
simonis@6465:   // We must right after attaching it remove it from the system. System V shm segments are global and
simonis@6465:   // survive the process.
simonis@6465:   // So, from here on: Do not assert. Do not return. Always do a "goto cleanup_shm".
simonis@6465: 
simonis@6465:   // try forcing the page size
simonis@6465:   size_t pagesize = -1; // unknown so far
simonis@6465: 
simonis@6465:   if (UseLargePages) {
simonis@6465: 
simonis@6465:     struct shmid_ds shmbuf;
simonis@6465:     memset(&shmbuf, 0, sizeof(shmbuf));
simonis@6465: 
simonis@6465:     // First, try to take from 16M page pool if...
simonis@6465:     if (os::Aix::can_use_16M_pages()  // we can ...
simonis@6465:         && Use16MPages                // we are not explicitly forbidden to do so (-XX:-Use16MPages)..
simonis@6465:         && try_16M_pages) {           // caller wants us to.
simonis@6465:       shmbuf.shm_pagesize = SIZE_16M;
simonis@6465:       if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) {
simonis@6465:         pagesize = SIZE_16M;
simonis@6465:       } else {
simonis@6465:         warning("Failed to allocate %d 16M pages. 16M page pool might be exhausted. (shmctl failed with %d)",
simonis@6465:                 size / SIZE_16M, errno);
simonis@6465:         if (f16M_pages_or_fail) {
simonis@6465:           goto cleanup_shm;
simonis@6465:         }
simonis@6465:       }
simonis@6465:     }
simonis@6465: 
simonis@6465:     // Nothing yet? Try setting 64K pages. Note that I never saw this fail, but in theory it might,
simonis@6465:     // because the 64K page pool may also be exhausted.
simonis@6465:     if (pagesize == -1) {
simonis@6465:       shmbuf.shm_pagesize = SIZE_64K;
simonis@6465:       if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) {
simonis@6465:         pagesize = SIZE_64K;
simonis@6465:       } else {
simonis@6465:         warning("Failed to allocate %d 64K pages. (shmctl failed with %d)",
simonis@6465:                 size / SIZE_64K, errno);
simonis@6465:         // here I give up. leave page_size -1 - later, after attaching, we will query the
simonis@6465:         // real page size of the attached memory. (in theory, it may be something different
simonis@6465:         // from 4K if LDR_CNTRL SHM_PSIZE is set)
simonis@6465:       }
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   // sanity point
simonis@6465:   assert(pagesize == -1 || pagesize == SIZE_16M || pagesize == SIZE_64K, "wrong page size");
simonis@6465: 
simonis@6465:   // Now attach the shared segment.
simonis@6465:   addr = (char*) shmat(shmid, requested_addr, 0);
simonis@6465:   if (addr == (char*)-1) {
simonis@6465:     // How to handle attach failure:
simonis@6465:     // If it failed for a specific wish address, tolerate this: in that case, if wish address was
simonis@6465:     // mandatory, fail, if not, retry anywhere.
simonis@6465:     // If it failed for any other reason, treat that as fatal error.
simonis@6465:     addr = NULL;
simonis@6465:     if (requested_addr) {
simonis@6465:       if (wishaddr_or_fail) {
simonis@6465:         goto cleanup_shm;
simonis@6465:       } else {
simonis@6465:         addr = (char*) shmat(shmid, NULL, 0);
simonis@6465:         if (addr == (char*)-1) { // fatal
simonis@6465:           addr = NULL;
simonis@6465:           warning("shmat failed (errno: %d)", errno);
simonis@6465:           goto cleanup_shm;
simonis@6465:         }
simonis@6465:       }
simonis@6465:     } else { // fatal
simonis@6465:       addr = NULL;
simonis@6465:       warning("shmat failed (errno: %d)", errno);
simonis@6465:       goto cleanup_shm;
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   // sanity point
simonis@6465:   assert(addr && addr != (char*) -1, "wrong address");
simonis@6465: 
simonis@6465:   // after successful Attach remove the segment - right away.
simonis@6465:   if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
simonis@6465:     warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
simonis@6465:     guarantee(false, "failed to remove shared memory segment!");
simonis@6465:   }
simonis@6465:   shmid = -1;
simonis@6465: 
simonis@6465:   // query the real page size. In case setting the page size did not work (see above), the system
simonis@6465:   // may have given us something other then 4K (LDR_CNTRL)
simonis@6465:   {
simonis@6465:     const size_t real_pagesize = os::Aix::query_pagesize(addr);
simonis@6465:     if (pagesize != -1) {
simonis@6465:       assert(pagesize == real_pagesize, "unexpected pagesize after shmat");
simonis@6465:     } else {
simonis@6465:       pagesize = real_pagesize;
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Now register the reserved block with internal book keeping.
simonis@6465:   LOCK_SHMBK
simonis@6465:     const bool pinned = pagesize >= SIZE_16M ? true : false;
simonis@6465:     ShmBkShmatedBlock* const p_block = new ShmBkShmatedBlock(AddrRange(addr, size), pagesize, pinned);
simonis@6465:     assert(p_block, "");
simonis@6465:     shmbk_register(p_block);
simonis@6465:   UNLOCK_SHMBK
simonis@6465: 
simonis@6465: cleanup_shm:
simonis@6465: 
simonis@6465:   // if we have not done so yet, remove the shared memory segment. This is very important.
simonis@6465:   if (shmid != -1) {
simonis@6465:     if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
simonis@6465:       warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
simonis@6465:       guarantee(false, "failed to remove shared memory segment!");
simonis@6465:     }
simonis@6465:     shmid = -1;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // trace
simonis@6465:   if (Verbose && !addr) {
simonis@6465:     if (requested_addr != NULL) {
simonis@6465:       warning("failed to shm-allocate 0x%llX bytes at with address 0x%p.", size, requested_addr);
simonis@6465:     } else {
simonis@6465:       warning("failed to shm-allocate 0x%llX bytes at any address.", size);
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   // hand info to caller
simonis@6465:   if (addr) {
simonis@6465:     p_info->addr = addr;
simonis@6465:     p_info->pagesize = pagesize;
simonis@6465:     p_info->pinned = pagesize == SIZE_16M ? true : false;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // sanity test:
simonis@6465:   if (requested_addr && addr && wishaddr_or_fail) {
simonis@6465:     guarantee(addr == requested_addr, "shmat error");
simonis@6465:   }
simonis@6465: 
simonis@6465:   // just one more test to really make sure we have no dangling shm segments.
simonis@6465:   guarantee(shmid == -1, "dangling shm segments");
simonis@6465: 
simonis@6465:   return addr ? true : false;
simonis@6465: 
simonis@6465: } // end: reserve_shmatted_memory
simonis@6465: 
simonis@6465: // Reserve memory using mmap. Behaves the same as reserve_shmatted_memory():
simonis@6465: // will return NULL in case of an error.
simonis@6465: static char* reserve_mmaped_memory(size_t bytes, char* requested_addr) {
simonis@6465: 
simonis@6465:   // if a wish address is given, but not aligned to 4K page boundary, mmap will fail.
simonis@6465:   if (requested_addr && ((uintptr_t)requested_addr % os::vm_page_size() != 0)) {
simonis@6465:     warning("Wish address 0x%p not aligned to page boundary.", requested_addr);
simonis@6465:     return NULL;
simonis@6465:   }
simonis@6465: 
simonis@6465:   const size_t size = align_size_up(bytes, SIZE_4K);
simonis@6465: 
simonis@6465:   // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
simonis@6465:   // msync(MS_INVALIDATE) (see os::uncommit_memory)
simonis@6465:   int flags = MAP_ANONYMOUS | MAP_SHARED;
simonis@6465: 
simonis@6465:   // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
simonis@6465:   // it means if wishaddress is given but MAP_FIXED is not set.
simonis@6465:   //
simonis@6465:   // Note however that this changes semantics in SPEC1170 mode insofar as MAP_FIXED
simonis@6465:   // clobbers the address range, which is probably not what the caller wants. That's
simonis@6465:   // why I assert here (again) that the SPEC1170 compat mode is off.
simonis@6465:   // If we want to be able to run under SPEC1170, we have to do some porting and
simonis@6465:   // testing.
simonis@6465:   if (requested_addr != NULL) {
simonis@6465:     assert(!os::Aix::xpg_sus_mode(), "SPEC1170 mode not allowed.");
simonis@6465:     flags |= MAP_FIXED;
simonis@6465:   }
simonis@6465: 
simonis@6465:   char* addr = (char*)::mmap(requested_addr, size, PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
simonis@6465: 
simonis@6465:   if (addr == MAP_FAILED) {
simonis@6465:     // attach failed: tolerate for specific wish addresses. Not being able to attach
simonis@6465:     // anywhere is a fatal error.
simonis@6465:     if (requested_addr == NULL) {
simonis@6465:       // It's ok to fail here if the machine has not enough memory.
simonis@6465:       warning("mmap(NULL, 0x%llX, ..) failed (%d)", size, errno);
simonis@6465:     }
simonis@6465:     addr = NULL;
simonis@6465:     goto cleanup_mmap;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // If we did request a specific address and that address was not available, fail.
simonis@6465:   if (addr && requested_addr) {
simonis@6465:     guarantee(addr == requested_addr, "unexpected");
simonis@6465:   }
simonis@6465: 
simonis@6465:   // register this mmap'ed segment with book keeping
simonis@6465:   LOCK_SHMBK
simonis@6465:     ShmBkMappedBlock* const p_block = new ShmBkMappedBlock(AddrRange(addr, size));
simonis@6465:     assert(p_block, "");
simonis@6465:     shmbk_register(p_block);
simonis@6465:   UNLOCK_SHMBK
simonis@6465: 
simonis@6465: cleanup_mmap:
simonis@6465: 
simonis@6465:   if (addr) {
simonis@6465:     if (Verbose) {
simonis@6465:       fprintf(stderr, "mmap-allocated 0x%p .. 0x%p (0x%llX bytes)\n", addr, addr + bytes, bytes);
simonis@6465:     }
simonis@6465:   }
simonis@6465:   else {
simonis@6465:     if (requested_addr != NULL) {
simonis@6465:       warning("failed to mmap-allocate 0x%llX bytes at wish address 0x%p.", bytes, requested_addr);
simonis@6465:     } else {
simonis@6465:       warning("failed to mmap-allocate 0x%llX bytes at any address.", bytes);
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   return addr;
simonis@6465: 
simonis@6465: } // end: reserve_mmaped_memory
simonis@6465: 
simonis@6465: // Reserves and attaches a shared memory segment.
simonis@6465: // Will assert if a wish address is given and could not be obtained.
simonis@6465: char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
simonis@6465:   return os::attempt_reserve_memory_at(bytes, requested_addr);
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::pd_release_memory(char* addr, size_t size) {
simonis@6465: 
simonis@6465:   // delegate to ShmBkBlock class which knows how to uncommit its memory.
simonis@6465: 
simonis@6465:   bool rc = false;
simonis@6465:   LOCK_SHMBK
simonis@6465:     ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
simonis@6465:     if (!block) {
simonis@6465:       fprintf(stderr, "invalid pointer: 0x%p.\n", addr);
simonis@6465:       shmbk_dump_info();
simonis@6465:       assert(false, "invalid pointer");
simonis@6465:       return false;
simonis@6465:     }
simonis@6465:     else if (!block->isSameRange(addr, size)) {
simonis@6465:       if (block->getType() == ShmBkBlock::MMAP) {
simonis@6465:         // Release only the same range or a the beginning or the end of a range.
simonis@6465:         if (block->base() == addr && size < block->size()) {
simonis@6465:           ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base() + size, block->size() - size));
simonis@6465:           assert(b, "");
simonis@6465:           shmbk_register(b);
simonis@6465:           block->setAddrRange(AddrRange(addr, size));
simonis@6465:         }
simonis@6465:         else if (addr > block->base() && addr + size == block->base() + block->size()) {
simonis@6465:           ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base(), block->size() - size));
simonis@6465:           assert(b, "");
simonis@6465:           shmbk_register(b);
simonis@6465:           block->setAddrRange(AddrRange(addr, size));
simonis@6465:         }
simonis@6465:         else {
simonis@6465:           fprintf(stderr, "invalid mmap range: 0x%p .. 0x%p.\n", addr, addr + size);
simonis@6465:           shmbk_dump_info();
simonis@6465:           assert(false, "invalid mmap range");
simonis@6465:           return false;
simonis@6465:         }
simonis@6465:       }
simonis@6465:       else {
simonis@6465:         // Release only the same range. No partial release allowed.
simonis@6465:         // Soften the requirement a bit, because the user may think he owns a smaller size
simonis@6465:         // than the block is due to alignment etc.
simonis@6465:         if (block->base() != addr || block->size() < size) {
simonis@6465:           fprintf(stderr, "invalid shmget range: 0x%p .. 0x%p.\n", addr, addr + size);
simonis@6465:           shmbk_dump_info();
simonis@6465:           assert(false, "invalid shmget range");
simonis@6465:           return false;
simonis@6465:         }
simonis@6465:       }
simonis@6465:     }
simonis@6465:     rc = block->release();
simonis@6465:     assert(rc, "release failed");
simonis@6465:     // remove block from bookkeeping
simonis@6465:     shmbk_unregister(block);
simonis@6465:     delete block;
simonis@6465:   UNLOCK_SHMBK
simonis@6465: 
simonis@6465:   if (!rc) {
simonis@6465:     warning("failed to released %lu bytes at 0x%p", size, addr);
simonis@6465:   }
simonis@6465: 
simonis@6465:   return rc;
simonis@6465: }
simonis@6465: 
simonis@6465: static bool checked_mprotect(char* addr, size_t size, int prot) {
simonis@6465: 
simonis@6465:   // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
simonis@6465:   // not tell me if protection failed when trying to protect an un-protectable range.
simonis@6465:   //
simonis@6465:   // This means if the memory was allocated using shmget/shmat, protection wont work
simonis@6465:   // but mprotect will still return 0:
simonis@6465:   //
simonis@6465:   // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
simonis@6465: 
simonis@6465:   bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
simonis@6465: 
simonis@6465:   if (!rc) {
simonis@6465:     const char* const s_errno = strerror(errno);
simonis@6465:     warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
simonis@6465:     return false;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // mprotect success check
simonis@6465:   //
simonis@6465:   // Mprotect said it changed the protection but can I believe it?
simonis@6465:   //
simonis@6465:   // To be sure I need to check the protection afterwards. Try to
simonis@6465:   // read from protected memory and check whether that causes a segfault.
simonis@6465:   //
simonis@6465:   if (!os::Aix::xpg_sus_mode()) {
simonis@6465: 
simonis@6465:     if (StubRoutines::SafeFetch32_stub()) {
simonis@6465: 
simonis@6465:       const bool read_protected =
simonis@6465:         (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
simonis@6465:          SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
simonis@6465: 
simonis@6465:       if (prot & PROT_READ) {
simonis@6465:         rc = !read_protected;
simonis@6465:       } else {
simonis@6465:         rc = read_protected;
simonis@6465:       }
simonis@6465:     }
simonis@6465:   }
simonis@6465:   if (!rc) {
simonis@6465:     assert(false, "mprotect failed.");
simonis@6465:   }
simonis@6465:   return rc;
simonis@6465: }
simonis@6465: 
simonis@6465: // Set protections specified
simonis@6465: bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
simonis@6465:   unsigned int p = 0;
simonis@6465:   switch (prot) {
simonis@6465:   case MEM_PROT_NONE: p = PROT_NONE; break;
simonis@6465:   case MEM_PROT_READ: p = PROT_READ; break;
simonis@6465:   case MEM_PROT_RW:   p = PROT_READ|PROT_WRITE; break;
simonis@6465:   case MEM_PROT_RWX:  p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
simonis@6465:   default:
simonis@6465:     ShouldNotReachHere();
simonis@6465:   }
simonis@6465:   // is_committed is unused.
simonis@6465:   return checked_mprotect(addr, size, p);
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::guard_memory(char* addr, size_t size) {
simonis@6465:   return checked_mprotect(addr, size, PROT_NONE);
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::unguard_memory(char* addr, size_t size) {
simonis@6465:   return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
simonis@6465: }
simonis@6465: 
simonis@6465: // Large page support
simonis@6465: 
simonis@6465: static size_t _large_page_size = 0;
simonis@6465: 
simonis@6465: // Enable large page support if OS allows that.
simonis@6465: void os::large_page_init() {
simonis@6465: 
simonis@6465:   // Note: os::Aix::query_multipage_support must run first.
simonis@6465: 
simonis@6465:   if (!UseLargePages) {
simonis@6465:     return;
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (!Aix::can_use_64K_pages()) {
simonis@6465:     assert(!Aix::can_use_16M_pages(), "64K is a precondition for 16M.");
simonis@6465:     UseLargePages = false;
simonis@6465:     return;
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (!Aix::can_use_16M_pages() && Use16MPages) {
simonis@6465:     fprintf(stderr, "Cannot use 16M pages. Please ensure that there is a 16M page pool "
simonis@6465:             " and that the VM runs with CAP_BYPASS_RAC_VMM and CAP_PROPAGATE capabilities.\n");
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Do not report 16M page alignment as part of os::_page_sizes if we are
simonis@6465:   // explicitly forbidden from using 16M pages. Doing so would increase the
simonis@6465:   // alignment the garbage collector calculates with, slightly increasing
simonis@6465:   // heap usage. We should only pay for 16M alignment if we really want to
simonis@6465:   // use 16M pages.
simonis@6465:   if (Use16MPages && Aix::can_use_16M_pages()) {
simonis@6465:     _large_page_size = SIZE_16M;
simonis@6465:     _page_sizes[0] = SIZE_16M;
simonis@6465:     _page_sizes[1] = SIZE_64K;
simonis@6465:     _page_sizes[2] = SIZE_4K;
simonis@6465:     _page_sizes[3] = 0;
simonis@6465:   } else if (Aix::can_use_64K_pages()) {
simonis@6465:     _large_page_size = SIZE_64K;
simonis@6465:     _page_sizes[0] = SIZE_64K;
simonis@6465:     _page_sizes[1] = SIZE_4K;
simonis@6465:     _page_sizes[2] = 0;
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (Verbose) {
simonis@6465:     ("Default large page size is 0x%llX.", _large_page_size);
simonis@6465:   }
simonis@6465: } // end: os::large_page_init()
simonis@6465: 
simonis@6465: char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
simonis@6465:   // "exec" is passed in but not used. Creating the shared image for
simonis@6465:   // the code cache doesn't have an SHM_X executable permission to check.
simonis@6465:   Unimplemented();
simonis@6465:   return 0;
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::release_memory_special(char* base, size_t bytes) {
simonis@6465:   // detaching the SHM segment will also delete it, see reserve_memory_special()
simonis@6465:   Unimplemented();
simonis@6465:   return false;
simonis@6465: }
simonis@6465: 
simonis@6465: size_t os::large_page_size() {
simonis@6465:   return _large_page_size;
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::can_commit_large_page_memory() {
simonis@6465:   // Well, sadly we cannot commit anything at all (see comment in
simonis@6465:   // os::commit_memory) but we claim to so we can make use of large pages
simonis@6465:   return true;
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::can_execute_large_page_memory() {
simonis@6465:   // We can do that
simonis@6465:   return true;
simonis@6465: }
simonis@6465: 
simonis@6465: // Reserve memory at an arbitrary address, only if that area is
simonis@6465: // available (and not reserved for something else).
simonis@6465: char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
simonis@6465: 
simonis@6465:   bool use_mmap = false;
simonis@6465: 
simonis@6465:   // mmap: smaller graining, no large page support
simonis@6465:   // shm: large graining (256M), large page support, limited number of shm segments
simonis@6465:   //
simonis@6465:   // Prefer mmap wherever we either do not need large page support or have OS limits
simonis@6465: 
simonis@6465:   if (!UseLargePages || bytes < SIZE_16M) {
simonis@6465:     use_mmap = true;
simonis@6465:   }
simonis@6465: 
simonis@6465:   char* addr = NULL;
simonis@6465:   if (use_mmap) {
simonis@6465:     addr = reserve_mmaped_memory(bytes, requested_addr);
simonis@6465:   } else {
simonis@6465:     // shmat: wish address is mandatory, and do not try 16M pages here.
simonis@6465:     shmatted_memory_info_t info;
simonis@6465:     const int flags = RESSHM_WISHADDR_OR_FAIL;
simonis@6465:     if (reserve_shmatted_memory(bytes, requested_addr, flags, &info)) {
simonis@6465:       addr = info.addr;
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   return addr;
simonis@6465: }
simonis@6465: 
simonis@6465: size_t os::read(int fd, void *buf, unsigned int nBytes) {
simonis@6465:   return ::read(fd, buf, nBytes);
simonis@6465: }
simonis@6465: 
simonis@6465: #define NANOSECS_PER_MILLISEC 1000000
simonis@6465: 
simonis@6465: int os::sleep(Thread* thread, jlong millis, bool interruptible) {
simonis@6465:   assert(thread == Thread::current(), "thread consistency check");
simonis@6465: 
simonis@6465:   // Prevent nasty overflow in deadline calculation
simonis@6465:   // by handling long sleeps similar to solaris or windows.
simonis@6465:   const jlong limit = INT_MAX;
simonis@6465:   int result;
simonis@6465:   while (millis > limit) {
simonis@6465:     if ((result = os::sleep(thread, limit, interruptible)) != OS_OK) {
simonis@6465:       return result;
simonis@6465:     }
simonis@6465:     millis -= limit;
simonis@6465:   }
simonis@6465: 
simonis@6465:   ParkEvent * const slp = thread->_SleepEvent;
simonis@6465:   slp->reset();
simonis@6465:   OrderAccess::fence();
simonis@6465: 
simonis@6465:   if (interruptible) {
simonis@6465:     jlong prevtime = javaTimeNanos();
simonis@6465: 
simonis@6465:     // Prevent precision loss and too long sleeps
simonis@6465:     jlong deadline = prevtime + millis * NANOSECS_PER_MILLISEC;
simonis@6465: 
simonis@6465:     for (;;) {
simonis@6465:       if (os::is_interrupted(thread, true)) {
simonis@6465:         return OS_INTRPT;
simonis@6465:       }
simonis@6465: 
simonis@6465:       jlong newtime = javaTimeNanos();
simonis@6465: 
simonis@6465:       assert(newtime >= prevtime, "time moving backwards");
simonis@6465:       // Doing prevtime and newtime in microseconds doesn't help precision,
simonis@6465:       // and trying to round up to avoid lost milliseconds can result in a
simonis@6465:       // too-short delay.
simonis@6465:       millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
simonis@6465: 
simonis@6465:       if (millis <= 0) {
simonis@6465:         return OS_OK;
simonis@6465:       }
simonis@6465: 
simonis@6465:       // Stop sleeping if we passed the deadline
simonis@6465:       if (newtime >= deadline) {
simonis@6465:         return OS_OK;
simonis@6465:       }
simonis@6465: 
simonis@6465:       prevtime = newtime;
simonis@6465: 
simonis@6465:       {
simonis@6465:         assert(thread->is_Java_thread(), "sanity check");
simonis@6465:         JavaThread *jt = (JavaThread *) thread;
simonis@6465:         ThreadBlockInVM tbivm(jt);
simonis@6465:         OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
simonis@6465: 
simonis@6465:         jt->set_suspend_equivalent();
simonis@6465: 
simonis@6465:         slp->park(millis);
simonis@6465: 
simonis@6465:         // were we externally suspended while we were waiting?
simonis@6465:         jt->check_and_wait_while_suspended();
simonis@6465:       }
simonis@6465:     }
simonis@6465:   } else {
simonis@6465:     OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
simonis@6465:     jlong prevtime = javaTimeNanos();
simonis@6465: 
simonis@6465:     // Prevent precision loss and too long sleeps
simonis@6465:     jlong deadline = prevtime + millis * NANOSECS_PER_MILLISEC;
simonis@6465: 
simonis@6465:     for (;;) {
simonis@6465:       // It'd be nice to avoid the back-to-back javaTimeNanos() calls on
simonis@6465:       // the 1st iteration ...
simonis@6465:       jlong newtime = javaTimeNanos();
simonis@6465: 
simonis@6465:       if (newtime - prevtime < 0) {
simonis@6465:         // time moving backwards, should only happen if no monotonic clock
simonis@6465:         // not a guarantee() because JVM should not abort on kernel/glibc bugs
simonis@6465:         // - HS14 Commented out as not implemented.
simonis@6465:         // - TODO Maybe we should implement it?
simonis@6465:         //assert(!Aix::supports_monotonic_clock(), "time moving backwards");
simonis@6465:       } else {
simonis@6465:         millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
simonis@6465:       }
simonis@6465: 
simonis@6465:       if (millis <= 0) break;
simonis@6465: 
simonis@6465:       if (newtime >= deadline) {
simonis@6465:         break;
simonis@6465:       }
simonis@6465: 
simonis@6465:       prevtime = newtime;
simonis@6465:       slp->park(millis);
simonis@6465:     }
simonis@6465:     return OS_OK;
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: int os::naked_sleep() {
simonis@6465:   // %% make the sleep time an integer flag. for now use 1 millisec.
simonis@6465:   return os::sleep(Thread::current(), 1, false);
simonis@6465: }
simonis@6465: 
simonis@6465: // Sleep forever; naked call to OS-specific sleep; use with CAUTION
simonis@6465: void os::infinite_sleep() {
simonis@6465:   while (true) {    // sleep forever ...
simonis@6465:     ::sleep(100);   // ... 100 seconds at a time
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: // Used to convert frequent JVM_Yield() to nops
simonis@6465: bool os::dont_yield() {
simonis@6465:   return DontYieldALot;
simonis@6465: }
simonis@6465: 
simonis@6465: void os::yield() {
simonis@6465:   sched_yield();
simonis@6465: }
simonis@6465: 
simonis@6465: os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN; }
simonis@6465: 
simonis@6465: void os::yield_all(int attempts) {
simonis@6465:   // Yields to all threads, including threads with lower priorities
simonis@6465:   // Threads on Linux are all with same priority. The Solaris style
simonis@6465:   // os::yield_all() with nanosleep(1ms) is not necessary.
simonis@6465:   sched_yield();
simonis@6465: }
simonis@6465: 
simonis@6465: // Called from the tight loops to possibly influence time-sharing heuristics
simonis@6465: void os::loop_breaker(int attempts) {
simonis@6465:   os::yield_all(attempts);
simonis@6465: }
simonis@6465: 
simonis@6465: ////////////////////////////////////////////////////////////////////////////////
simonis@6465: // thread priority support
simonis@6465: 
simonis@6465: // From AIX manpage to pthread_setschedparam
simonis@6465: // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
simonis@6465: //    topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
simonis@6465: //
simonis@6465: // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
simonis@6465: // range from 40 to 80, where 40 is the least favored priority and 80
simonis@6465: // is the most favored."
simonis@6465: //
simonis@6465: // (Actually, I doubt this even has an impact on AIX, as we do kernel
simonis@6465: // scheduling there; however, this still leaves iSeries.)
simonis@6465: //
simonis@6465: // We use the same values for AIX and PASE.
simonis@6465: int os::java_to_os_priority[CriticalPriority + 1] = {
simonis@6465:   54,             // 0 Entry should never be used
simonis@6465: 
simonis@6465:   55,             // 1 MinPriority
simonis@6465:   55,             // 2
simonis@6465:   56,             // 3
simonis@6465: 
simonis@6465:   56,             // 4
simonis@6465:   57,             // 5 NormPriority
simonis@6465:   57,             // 6
simonis@6465: 
simonis@6465:   58,             // 7
simonis@6465:   58,             // 8
simonis@6465:   59,             // 9 NearMaxPriority
simonis@6465: 
simonis@6465:   60,             // 10 MaxPriority
simonis@6465: 
simonis@6465:   60              // 11 CriticalPriority
simonis@6465: };
simonis@6465: 
simonis@6465: OSReturn os::set_native_priority(Thread* thread, int newpri) {
simonis@6465:   if (!UseThreadPriorities) return OS_OK;
simonis@6465:   pthread_t thr = thread->osthread()->pthread_id();
simonis@6465:   int policy = SCHED_OTHER;
simonis@6465:   struct sched_param param;
simonis@6465:   param.sched_priority = newpri;
simonis@6465:   int ret = pthread_setschedparam(thr, policy, &param);
simonis@6465: 
simonis@6465:   if (Verbose) {
simonis@6465:     if (ret == 0) {
simonis@6465:       fprintf(stderr, "changed priority of thread %d to %d\n", (int)thr, newpri);
simonis@6465:     } else {
simonis@6465:       fprintf(stderr, "Could not changed priority for thread %d to %d (error %d, %s)\n",
simonis@6465:               (int)thr, newpri, ret, strerror(ret));
simonis@6465:     }
simonis@6465:   }
simonis@6465:   return (ret == 0) ? OS_OK : OS_ERR;
simonis@6465: }
simonis@6465: 
simonis@6465: OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
simonis@6465:   if (!UseThreadPriorities) {
simonis@6465:     *priority_ptr = java_to_os_priority[NormPriority];
simonis@6465:     return OS_OK;
simonis@6465:   }
simonis@6465:   pthread_t thr = thread->osthread()->pthread_id();
simonis@6465:   int policy = SCHED_OTHER;
simonis@6465:   struct sched_param param;
simonis@6465:   int ret = pthread_getschedparam(thr, &policy, &param);
simonis@6465:   *priority_ptr = param.sched_priority;
simonis@6465: 
simonis@6465:   return (ret == 0) ? OS_OK : OS_ERR;
simonis@6465: }
simonis@6465: 
simonis@6465: // Hint to the underlying OS that a task switch would not be good.
simonis@6465: // Void return because it's a hint and can fail.
simonis@6465: void os::hint_no_preempt() {}
simonis@6465: 
simonis@6465: ////////////////////////////////////////////////////////////////////////////////
simonis@6465: // suspend/resume support
simonis@6465: 
simonis@6465: //  the low-level signal-based suspend/resume support is a remnant from the
simonis@6465: //  old VM-suspension that used to be for java-suspension, safepoints etc,
simonis@6465: //  within hotspot. Now there is a single use-case for this:
simonis@6465: //    - calling get_thread_pc() on the VMThread by the flat-profiler task
simonis@6465: //      that runs in the watcher thread.
simonis@6465: //  The remaining code is greatly simplified from the more general suspension
simonis@6465: //  code that used to be used.
simonis@6465: //
simonis@6465: //  The protocol is quite simple:
simonis@6465: //  - suspend:
simonis@6465: //      - sends a signal to the target thread
simonis@6465: //      - polls the suspend state of the osthread using a yield loop
simonis@6465: //      - target thread signal handler (SR_handler) sets suspend state
simonis@6465: //        and blocks in sigsuspend until continued
simonis@6465: //  - resume:
simonis@6465: //      - sets target osthread state to continue
simonis@6465: //      - sends signal to end the sigsuspend loop in the SR_handler
simonis@6465: //
simonis@6465: //  Note that the SR_lock plays no role in this suspend/resume protocol.
simonis@6465: //
simonis@6465: 
simonis@6465: static void resume_clear_context(OSThread *osthread) {
simonis@6465:   osthread->set_ucontext(NULL);
simonis@6465:   osthread->set_siginfo(NULL);
simonis@6465: }
simonis@6465: 
simonis@6465: static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
simonis@6465:   osthread->set_ucontext(context);
simonis@6465:   osthread->set_siginfo(siginfo);
simonis@6465: }
simonis@6465: 
simonis@6465: //
simonis@6465: // Handler function invoked when a thread's execution is suspended or
simonis@6465: // resumed. We have to be careful that only async-safe functions are
simonis@6465: // called here (Note: most pthread functions are not async safe and
simonis@6465: // should be avoided.)
simonis@6465: //
simonis@6465: // Note: sigwait() is a more natural fit than sigsuspend() from an
simonis@6465: // interface point of view, but sigwait() prevents the signal hander
simonis@6465: // from being run. libpthread would get very confused by not having
simonis@6465: // its signal handlers run and prevents sigwait()'s use with the
simonis@6465: // mutex granting granting signal.
simonis@6465: //
simonis@6465: // Currently only ever called on the VMThread and JavaThreads (PC sampling).
simonis@6465: //
simonis@6465: static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
simonis@6465:   // Save and restore errno to avoid confusing native code with EINTR
simonis@6465:   // after sigsuspend.
simonis@6465:   int old_errno = errno;
simonis@6465: 
simonis@6465:   Thread* thread = Thread::current();
simonis@6465:   OSThread* osthread = thread->osthread();
simonis@6465:   assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
simonis@6465: 
simonis@6465:   os::SuspendResume::State current = osthread->sr.state();
simonis@6465:   if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
simonis@6465:     suspend_save_context(osthread, siginfo, context);
simonis@6465: 
simonis@6465:     // attempt to switch the state, we assume we had a SUSPEND_REQUEST
simonis@6465:     os::SuspendResume::State state = osthread->sr.suspended();
simonis@6465:     if (state == os::SuspendResume::SR_SUSPENDED) {
simonis@6465:       sigset_t suspend_set;  // signals for sigsuspend()
simonis@6465: 
simonis@6465:       // get current set of blocked signals and unblock resume signal
simonis@6465:       pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
simonis@6465:       sigdelset(&suspend_set, SR_signum);
simonis@6465: 
simonis@6465:       // wait here until we are resumed
simonis@6465:       while (1) {
simonis@6465:         sigsuspend(&suspend_set);
simonis@6465: 
simonis@6465:         os::SuspendResume::State result = osthread->sr.running();
simonis@6465:         if (result == os::SuspendResume::SR_RUNNING) {
simonis@6465:           break;
simonis@6465:         }
simonis@6465:       }
simonis@6465: 
simonis@6465:     } else if (state == os::SuspendResume::SR_RUNNING) {
simonis@6465:       // request was cancelled, continue
simonis@6465:     } else {
simonis@6465:       ShouldNotReachHere();
simonis@6465:     }
simonis@6465: 
simonis@6465:     resume_clear_context(osthread);
simonis@6465:   } else if (current == os::SuspendResume::SR_RUNNING) {
simonis@6465:     // request was cancelled, continue
simonis@6465:   } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
simonis@6465:     // ignore
simonis@6465:   } else {
simonis@6465:     ShouldNotReachHere();
simonis@6465:   }
simonis@6465: 
simonis@6465:   errno = old_errno;
simonis@6465: }
simonis@6465: 
simonis@6465: 
simonis@6465: static int SR_initialize() {
simonis@6465:   struct sigaction act;
simonis@6465:   char *s;
simonis@6465:   // Get signal number to use for suspend/resume
simonis@6465:   if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
simonis@6465:     int sig = ::strtol(s, 0, 10);
simonis@6465:     if (sig > 0 || sig < NSIG) {
simonis@6465:       SR_signum = sig;
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
simonis@6465:         "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
simonis@6465: 
simonis@6465:   sigemptyset(&SR_sigset);
simonis@6465:   sigaddset(&SR_sigset, SR_signum);
simonis@6465: 
simonis@6465:   // Set up signal handler for suspend/resume.
simonis@6465:   act.sa_flags = SA_RESTART|SA_SIGINFO;
simonis@6465:   act.sa_handler = (void (*)(int)) SR_handler;
simonis@6465: 
simonis@6465:   // SR_signum is blocked by default.
simonis@6465:   // 4528190 - We also need to block pthread restart signal (32 on all
simonis@6465:   // supported Linux platforms). Note that LinuxThreads need to block
simonis@6465:   // this signal for all threads to work properly. So we don't have
simonis@6465:   // to use hard-coded signal number when setting up the mask.
simonis@6465:   pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
simonis@6465: 
simonis@6465:   if (sigaction(SR_signum, &act, 0) == -1) {
simonis@6465:     return -1;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Save signal flag
simonis@6465:   os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
simonis@6465:   return 0;
simonis@6465: }
simonis@6465: 
simonis@6465: static int SR_finalize() {
simonis@6465:   return 0;
simonis@6465: }
simonis@6465: 
simonis@6465: static int sr_notify(OSThread* osthread) {
simonis@6465:   int status = pthread_kill(osthread->pthread_id(), SR_signum);
simonis@6465:   assert_status(status == 0, status, "pthread_kill");
simonis@6465:   return status;
simonis@6465: }
simonis@6465: 
simonis@6465: // "Randomly" selected value for how long we want to spin
simonis@6465: // before bailing out on suspending a thread, also how often
simonis@6465: // we send a signal to a thread we want to resume
simonis@6465: static const int RANDOMLY_LARGE_INTEGER = 1000000;
simonis@6465: static const int RANDOMLY_LARGE_INTEGER2 = 100;
simonis@6465: 
simonis@6465: // returns true on success and false on error - really an error is fatal
simonis@6465: // but this seems the normal response to library errors
simonis@6465: static bool do_suspend(OSThread* osthread) {
simonis@6465:   assert(osthread->sr.is_running(), "thread should be running");
simonis@6465:   // mark as suspended and send signal
simonis@6465: 
simonis@6465:   if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
simonis@6465:     // failed to switch, state wasn't running?
simonis@6465:     ShouldNotReachHere();
simonis@6465:     return false;
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (sr_notify(osthread) != 0) {
simonis@6465:     // try to cancel, switch to running
simonis@6465: 
simonis@6465:     os::SuspendResume::State result = osthread->sr.cancel_suspend();
simonis@6465:     if (result == os::SuspendResume::SR_RUNNING) {
simonis@6465:       // cancelled
simonis@6465:       return false;
simonis@6465:     } else if (result == os::SuspendResume::SR_SUSPENDED) {
simonis@6465:       // somehow managed to suspend
simonis@6465:       return true;
simonis@6465:     } else {
simonis@6465:       ShouldNotReachHere();
simonis@6465:       return false;
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
simonis@6465: 
simonis@6465:   for (int n = 0; !osthread->sr.is_suspended(); n++) {
simonis@6465:     for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
simonis@6465:       os::yield_all(i);
simonis@6465:     }
simonis@6465: 
simonis@6465:     // timeout, try to cancel the request
simonis@6465:     if (n >= RANDOMLY_LARGE_INTEGER) {
simonis@6465:       os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
simonis@6465:       if (cancelled == os::SuspendResume::SR_RUNNING) {
simonis@6465:         return false;
simonis@6465:       } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
simonis@6465:         return true;
simonis@6465:       } else {
simonis@6465:         ShouldNotReachHere();
simonis@6465:         return false;
simonis@6465:       }
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   guarantee(osthread->sr.is_suspended(), "Must be suspended");
simonis@6465:   return true;
simonis@6465: }
simonis@6465: 
simonis@6465: static void do_resume(OSThread* osthread) {
simonis@6465:   //assert(osthread->sr.is_suspended(), "thread should be suspended");
simonis@6465: 
simonis@6465:   if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
simonis@6465:     // failed to switch to WAKEUP_REQUEST
simonis@6465:     ShouldNotReachHere();
simonis@6465:     return;
simonis@6465:   }
simonis@6465: 
simonis@6465:   while (!osthread->sr.is_running()) {
simonis@6465:     if (sr_notify(osthread) == 0) {
simonis@6465:       for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
simonis@6465:         for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
simonis@6465:           os::yield_all(i);
simonis@6465:         }
simonis@6465:       }
simonis@6465:     } else {
simonis@6465:       ShouldNotReachHere();
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   guarantee(osthread->sr.is_running(), "Must be running!");
simonis@6465: }
simonis@6465: 
simonis@6465: ////////////////////////////////////////////////////////////////////////////////
simonis@6465: // interrupt support
simonis@6465: 
simonis@6465: void os::interrupt(Thread* thread) {
simonis@6465:   assert(Thread::current() == thread || Threads_lock->owned_by_self(),
simonis@6465:     "possibility of dangling Thread pointer");
simonis@6465: 
simonis@6465:   OSThread* osthread = thread->osthread();
simonis@6465: 
simonis@6465:   if (!osthread->interrupted()) {
simonis@6465:     osthread->set_interrupted(true);
simonis@6465:     // More than one thread can get here with the same value of osthread,
simonis@6465:     // resulting in multiple notifications.  We do, however, want the store
simonis@6465:     // to interrupted() to be visible to other threads before we execute unpark().
simonis@6465:     OrderAccess::fence();
simonis@6465:     ParkEvent * const slp = thread->_SleepEvent;
simonis@6465:     if (slp != NULL) slp->unpark();
simonis@6465:   }
simonis@6465: 
simonis@6465:   // For JSR166. Unpark even if interrupt status already was set
simonis@6465:   if (thread->is_Java_thread())
simonis@6465:     ((JavaThread*)thread)->parker()->unpark();
simonis@6465: 
simonis@6465:   ParkEvent * ev = thread->_ParkEvent;
simonis@6465:   if (ev != NULL) ev->unpark();
simonis@6465: 
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
simonis@6465:   assert(Thread::current() == thread || Threads_lock->owned_by_self(),
simonis@6465:     "possibility of dangling Thread pointer");
simonis@6465: 
simonis@6465:   OSThread* osthread = thread->osthread();
simonis@6465: 
simonis@6465:   bool interrupted = osthread->interrupted();
simonis@6465: 
simonis@6465:   if (interrupted && clear_interrupted) {
simonis@6465:     osthread->set_interrupted(false);
simonis@6465:     // consider thread->_SleepEvent->reset() ... optional optimization
simonis@6465:   }
simonis@6465: 
simonis@6465:   return interrupted;
simonis@6465: }
simonis@6465: 
simonis@6465: ///////////////////////////////////////////////////////////////////////////////////
simonis@6465: // signal handling (except suspend/resume)
simonis@6465: 
simonis@6465: // This routine may be used by user applications as a "hook" to catch signals.
simonis@6465: // The user-defined signal handler must pass unrecognized signals to this
simonis@6465: // routine, and if it returns true (non-zero), then the signal handler must
simonis@6465: // return immediately. If the flag "abort_if_unrecognized" is true, then this
simonis@6465: // routine will never retun false (zero), but instead will execute a VM panic
simonis@6465: // routine kill the process.
simonis@6465: //
simonis@6465: // If this routine returns false, it is OK to call it again. This allows
simonis@6465: // the user-defined signal handler to perform checks either before or after
simonis@6465: // the VM performs its own checks. Naturally, the user code would be making
simonis@6465: // a serious error if it tried to handle an exception (such as a null check
simonis@6465: // or breakpoint) that the VM was generating for its own correct operation.
simonis@6465: //
simonis@6465: // This routine may recognize any of the following kinds of signals:
simonis@6465: //   SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
simonis@6465: // It should be consulted by handlers for any of those signals.
simonis@6465: //
simonis@6465: // The caller of this routine must pass in the three arguments supplied
simonis@6465: // to the function referred to in the "sa_sigaction" (not the "sa_handler")
simonis@6465: // field of the structure passed to sigaction(). This routine assumes that
simonis@6465: // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
simonis@6465: //
simonis@6465: // Note that the VM will print warnings if it detects conflicting signal
simonis@6465: // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
simonis@6465: //
simonis@6465: extern "C" JNIEXPORT int
simonis@6465: JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
simonis@6465: 
simonis@6465: // Set thread signal mask (for some reason on AIX sigthreadmask() seems
simonis@6465: // to be the thing to call; documentation is not terribly clear about whether
simonis@6465: // pthread_sigmask also works, and if it does, whether it does the same.
simonis@6465: bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
simonis@6465:   const int rc = ::pthread_sigmask(how, set, oset);
simonis@6465:   // return value semantics differ slightly for error case:
simonis@6465:   // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
simonis@6465:   // (so, pthread_sigmask is more theadsafe for error handling)
simonis@6465:   // But success is always 0.
simonis@6465:   return rc == 0 ? true : false;
simonis@6465: }
simonis@6465: 
simonis@6465: // Function to unblock all signals which are, according
simonis@6465: // to POSIX, typical program error signals. If they happen while being blocked,
simonis@6465: // they typically will bring down the process immediately.
simonis@6465: bool unblock_program_error_signals() {
simonis@6465:   sigset_t set;
simonis@6465:   ::sigemptyset(&set);
simonis@6465:   ::sigaddset(&set, SIGILL);
simonis@6465:   ::sigaddset(&set, SIGBUS);
simonis@6465:   ::sigaddset(&set, SIGFPE);
simonis@6465:   ::sigaddset(&set, SIGSEGV);
simonis@6465:   return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
simonis@6465: }
simonis@6465: 
simonis@6465: // Renamed from 'signalHandler' to avoid collision with other shared libs.
simonis@6465: void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
simonis@6465:   assert(info != NULL && uc != NULL, "it must be old kernel");
simonis@6465: 
simonis@6465:   // Never leave program error signals blocked;
simonis@6465:   // on all our platforms they would bring down the process immediately when
simonis@6465:   // getting raised while being blocked.
simonis@6465:   unblock_program_error_signals();
simonis@6465: 
simonis@6465:   JVM_handle_aix_signal(sig, info, uc, true);
simonis@6465: }
simonis@6465: 
simonis@6465: 
simonis@6465: // This boolean allows users to forward their own non-matching signals
simonis@6465: // to JVM_handle_aix_signal, harmlessly.
simonis@6465: bool os::Aix::signal_handlers_are_installed = false;
simonis@6465: 
simonis@6465: // For signal-chaining
simonis@6465: struct sigaction os::Aix::sigact[MAXSIGNUM];
simonis@6465: unsigned int os::Aix::sigs = 0;
simonis@6465: bool os::Aix::libjsig_is_loaded = false;
simonis@6465: typedef struct sigaction *(*get_signal_t)(int);
simonis@6465: get_signal_t os::Aix::get_signal_action = NULL;
simonis@6465: 
simonis@6465: struct sigaction* os::Aix::get_chained_signal_action(int sig) {
simonis@6465:   struct sigaction *actp = NULL;
simonis@6465: 
simonis@6465:   if (libjsig_is_loaded) {
simonis@6465:     // Retrieve the old signal handler from libjsig
simonis@6465:     actp = (*get_signal_action)(sig);
simonis@6465:   }
simonis@6465:   if (actp == NULL) {
simonis@6465:     // Retrieve the preinstalled signal handler from jvm
simonis@6465:     actp = get_preinstalled_handler(sig);
simonis@6465:   }
simonis@6465: 
simonis@6465:   return actp;
simonis@6465: }
simonis@6465: 
simonis@6465: static bool call_chained_handler(struct sigaction *actp, int sig,
simonis@6465:                                  siginfo_t *siginfo, void *context) {
simonis@6465:   Unimplemented();
simonis@6465:   return true;
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
simonis@6465:   bool chained = false;
simonis@6465:   // signal-chaining
simonis@6465:   if (UseSignalChaining) {
simonis@6465:     struct sigaction *actp = get_chained_signal_action(sig);
simonis@6465:     if (actp != NULL) {
simonis@6465:       chained = call_chained_handler(actp, sig, siginfo, context);
simonis@6465:     }
simonis@6465:   }
simonis@6465:   return chained;
simonis@6465: }
simonis@6465: 
simonis@6465: struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
simonis@6465:   if ((((unsigned int)1 << sig) & sigs) != 0) {
simonis@6465:     return &sigact[sig];
simonis@6465:   }
simonis@6465:   return NULL;
simonis@6465: }
simonis@6465: 
simonis@6465: void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
simonis@6465:   assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
simonis@6465:   sigact[sig] = oldAct;
simonis@6465:   sigs |= (unsigned int)1 << sig;
simonis@6465: }
simonis@6465: 
simonis@6465: // for diagnostic
simonis@6465: int os::Aix::sigflags[MAXSIGNUM];
simonis@6465: 
simonis@6465: int os::Aix::get_our_sigflags(int sig) {
simonis@6465:   assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
simonis@6465:   return sigflags[sig];
simonis@6465: }
simonis@6465: 
simonis@6465: void os::Aix::set_our_sigflags(int sig, int flags) {
simonis@6465:   assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
simonis@6465:   sigflags[sig] = flags;
simonis@6465: }
simonis@6465: 
simonis@6465: void os::Aix::set_signal_handler(int sig, bool set_installed) {
simonis@6465:   // Check for overwrite.
simonis@6465:   struct sigaction oldAct;
simonis@6465:   sigaction(sig, (struct sigaction*)NULL, &oldAct);
simonis@6465: 
simonis@6465:   void* oldhand = oldAct.sa_sigaction
simonis@6465:     ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
simonis@6465:     : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
simonis@6465:   // Renamed 'signalHandler' to avoid collision with other shared libs.
simonis@6465:   if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
simonis@6465:       oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
simonis@6465:       oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
simonis@6465:     if (AllowUserSignalHandlers || !set_installed) {
simonis@6465:       // Do not overwrite; user takes responsibility to forward to us.
simonis@6465:       return;
simonis@6465:     } else if (UseSignalChaining) {
simonis@6465:       // save the old handler in jvm
simonis@6465:       save_preinstalled_handler(sig, oldAct);
simonis@6465:       // libjsig also interposes the sigaction() call below and saves the
simonis@6465:       // old sigaction on it own.
simonis@6465:     } else {
simonis@6465:       fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
simonis@6465:                     "%#lx for signal %d.", (long)oldhand, sig));
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   struct sigaction sigAct;
simonis@6465:   sigfillset(&(sigAct.sa_mask));
simonis@6465:   if (!set_installed) {
simonis@6465:     sigAct.sa_handler = SIG_DFL;
simonis@6465:     sigAct.sa_flags = SA_RESTART;
simonis@6465:   } else {
simonis@6465:     // Renamed 'signalHandler' to avoid collision with other shared libs.
simonis@6465:     sigAct.sa_sigaction = javaSignalHandler;
simonis@6465:     sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
simonis@6465:   }
simonis@6465:   // Save flags, which are set by ours
simonis@6465:   assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
simonis@6465:   sigflags[sig] = sigAct.sa_flags;
simonis@6465: 
simonis@6465:   int ret = sigaction(sig, &sigAct, &oldAct);
simonis@6465:   assert(ret == 0, "check");
simonis@6465: 
simonis@6465:   void* oldhand2 = oldAct.sa_sigaction
simonis@6465:                  ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
simonis@6465:                  : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
simonis@6465:   assert(oldhand2 == oldhand, "no concurrent signal handler installation");
simonis@6465: }
simonis@6465: 
simonis@6465: // install signal handlers for signals that HotSpot needs to
simonis@6465: // handle in order to support Java-level exception handling.
simonis@6465: void os::Aix::install_signal_handlers() {
simonis@6465:   if (!signal_handlers_are_installed) {
simonis@6465:     signal_handlers_are_installed = true;
simonis@6465: 
simonis@6465:     // signal-chaining
simonis@6465:     typedef void (*signal_setting_t)();
simonis@6465:     signal_setting_t begin_signal_setting = NULL;
simonis@6465:     signal_setting_t end_signal_setting = NULL;
simonis@6465:     begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
simonis@6465:                              dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
simonis@6465:     if (begin_signal_setting != NULL) {
simonis@6465:       end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
simonis@6465:                              dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
simonis@6465:       get_signal_action = CAST_TO_FN_PTR(get_signal_t,
simonis@6465:                             dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
simonis@6465:       libjsig_is_loaded = true;
simonis@6465:       assert(UseSignalChaining, "should enable signal-chaining");
simonis@6465:     }
simonis@6465:     if (libjsig_is_loaded) {
simonis@6465:       // Tell libjsig jvm is setting signal handlers
simonis@6465:       (*begin_signal_setting)();
simonis@6465:     }
simonis@6465: 
simonis@6465:     set_signal_handler(SIGSEGV, true);
simonis@6465:     set_signal_handler(SIGPIPE, true);
simonis@6465:     set_signal_handler(SIGBUS, true);
simonis@6465:     set_signal_handler(SIGILL, true);
simonis@6465:     set_signal_handler(SIGFPE, true);
simonis@6465:     set_signal_handler(SIGTRAP, true);
simonis@6465:     set_signal_handler(SIGXFSZ, true);
simonis@6465:     set_signal_handler(SIGDANGER, true);
simonis@6465: 
simonis@6465:     if (libjsig_is_loaded) {
simonis@6465:       // Tell libjsig jvm finishes setting signal handlers
simonis@6465:       (*end_signal_setting)();
simonis@6465:     }
simonis@6465: 
simonis@6465:     // We don't activate signal checker if libjsig is in place, we trust ourselves
simonis@6465:     // and if UserSignalHandler is installed all bets are off.
simonis@6465:     // Log that signal checking is off only if -verbose:jni is specified.
simonis@6465:     if (CheckJNICalls) {
simonis@6465:       if (libjsig_is_loaded) {
simonis@6465:         tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
simonis@6465:         check_signals = false;
simonis@6465:       }
simonis@6465:       if (AllowUserSignalHandlers) {
simonis@6465:         tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
simonis@6465:         check_signals = false;
simonis@6465:       }
simonis@6465:       // need to initialize check_signal_done
simonis@6465:       ::sigemptyset(&check_signal_done);
simonis@6465:     }
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: static const char* get_signal_handler_name(address handler,
simonis@6465:                                            char* buf, int buflen) {
simonis@6465:   int offset;
simonis@6465:   bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
simonis@6465:   if (found) {
simonis@6465:     // skip directory names
simonis@6465:     const char *p1, *p2;
simonis@6465:     p1 = buf;
simonis@6465:     size_t len = strlen(os::file_separator());
simonis@6465:     while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
simonis@6465:     // The way os::dll_address_to_library_name is implemented on Aix
simonis@6465:     // right now, it always returns -1 for the offset which is not
simonis@6465:     // terribly informative.
simonis@6465:     // Will fix that. For now, omit the offset.
simonis@6465:     jio_snprintf(buf, buflen, "%s", p1);
simonis@6465:   } else {
simonis@6465:     jio_snprintf(buf, buflen, PTR_FORMAT, handler);
simonis@6465:   }
simonis@6465:   return buf;
simonis@6465: }
simonis@6465: 
simonis@6465: static void print_signal_handler(outputStream* st, int sig,
simonis@6465:                                  char* buf, size_t buflen) {
simonis@6465:   struct sigaction sa;
simonis@6465:   sigaction(sig, NULL, &sa);
simonis@6465: 
simonis@6465:   st->print("%s: ", os::exception_name(sig, buf, buflen));
simonis@6465: 
simonis@6465:   address handler = (sa.sa_flags & SA_SIGINFO)
simonis@6465:     ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
simonis@6465:     : CAST_FROM_FN_PTR(address, sa.sa_handler);
simonis@6465: 
simonis@6465:   if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
simonis@6465:     st->print("SIG_DFL");
simonis@6465:   } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
simonis@6465:     st->print("SIG_IGN");
simonis@6465:   } else {
simonis@6465:     st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Print readable mask.
simonis@6465:   st->print(", sa_mask[0]=");
simonis@6465:   os::Posix::print_signal_set_short(st, &sa.sa_mask);
simonis@6465: 
simonis@6465:   address rh = VMError::get_resetted_sighandler(sig);
simonis@6465:   // May be, handler was resetted by VMError?
simonis@6465:   if (rh != NULL) {
simonis@6465:     handler = rh;
simonis@6465:     sa.sa_flags = VMError::get_resetted_sigflags(sig);
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Print textual representation of sa_flags.
simonis@6465:   st->print(", sa_flags=");
simonis@6465:   os::Posix::print_sa_flags(st, sa.sa_flags);
simonis@6465: 
simonis@6465:   // Check: is it our handler?
simonis@6465:   if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
simonis@6465:       handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
simonis@6465:     // It is our signal handler.
simonis@6465:     // Check for flags, reset system-used one!
simonis@6465:     if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
simonis@6465:       st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
simonis@6465:                 os::Aix::get_our_sigflags(sig));
simonis@6465:     }
simonis@6465:   }
simonis@6465:   st->cr();
simonis@6465: }
simonis@6465: 
simonis@6465: 
simonis@6465: #define DO_SIGNAL_CHECK(sig) \
simonis@6465:   if (!sigismember(&check_signal_done, sig)) \
simonis@6465:     os::Aix::check_signal_handler(sig)
simonis@6465: 
simonis@6465: // This method is a periodic task to check for misbehaving JNI applications
simonis@6465: // under CheckJNI, we can add any periodic checks here
simonis@6465: 
simonis@6465: void os::run_periodic_checks() {
simonis@6465: 
simonis@6465:   if (check_signals == false) return;
simonis@6465: 
simonis@6465:   // SEGV and BUS if overridden could potentially prevent
simonis@6465:   // generation of hs*.log in the event of a crash, debugging
simonis@6465:   // such a case can be very challenging, so we absolutely
simonis@6465:   // check the following for a good measure:
simonis@6465:   DO_SIGNAL_CHECK(SIGSEGV);
simonis@6465:   DO_SIGNAL_CHECK(SIGILL);
simonis@6465:   DO_SIGNAL_CHECK(SIGFPE);
simonis@6465:   DO_SIGNAL_CHECK(SIGBUS);
simonis@6465:   DO_SIGNAL_CHECK(SIGPIPE);
simonis@6465:   DO_SIGNAL_CHECK(SIGXFSZ);
simonis@6465:   if (UseSIGTRAP) {
simonis@6465:     DO_SIGNAL_CHECK(SIGTRAP);
simonis@6465:   }
simonis@6465:   DO_SIGNAL_CHECK(SIGDANGER);
simonis@6465: 
simonis@6465:   // ReduceSignalUsage allows the user to override these handlers
simonis@6465:   // see comments at the very top and jvm_solaris.h
simonis@6465:   if (!ReduceSignalUsage) {
simonis@6465:     DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
simonis@6465:     DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
simonis@6465:     DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
simonis@6465:     DO_SIGNAL_CHECK(BREAK_SIGNAL);
simonis@6465:   }
simonis@6465: 
simonis@6465:   DO_SIGNAL_CHECK(SR_signum);
simonis@6465:   DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
simonis@6465: }
simonis@6465: 
simonis@6465: typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
simonis@6465: 
simonis@6465: static os_sigaction_t os_sigaction = NULL;
simonis@6465: 
simonis@6465: void os::Aix::check_signal_handler(int sig) {
simonis@6465:   char buf[O_BUFLEN];
simonis@6465:   address jvmHandler = NULL;
simonis@6465: 
simonis@6465:   struct sigaction act;
simonis@6465:   if (os_sigaction == NULL) {
simonis@6465:     // only trust the default sigaction, in case it has been interposed
simonis@6465:     os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
simonis@6465:     if (os_sigaction == NULL) return;
simonis@6465:   }
simonis@6465: 
simonis@6465:   os_sigaction(sig, (struct sigaction*)NULL, &act);
simonis@6465: 
simonis@6465:   address thisHandler = (act.sa_flags & SA_SIGINFO)
simonis@6465:     ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
simonis@6465:     : CAST_FROM_FN_PTR(address, act.sa_handler);
simonis@6465: 
simonis@6465: 
simonis@6465:   switch(sig) {
simonis@6465:   case SIGSEGV:
simonis@6465:   case SIGBUS:
simonis@6465:   case SIGFPE:
simonis@6465:   case SIGPIPE:
simonis@6465:   case SIGILL:
simonis@6465:   case SIGXFSZ:
simonis@6465:     // Renamed 'signalHandler' to avoid collision with other shared libs.
simonis@6465:     jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
simonis@6465:     break;
simonis@6465: 
simonis@6465:   case SHUTDOWN1_SIGNAL:
simonis@6465:   case SHUTDOWN2_SIGNAL:
simonis@6465:   case SHUTDOWN3_SIGNAL:
simonis@6465:   case BREAK_SIGNAL:
simonis@6465:     jvmHandler = (address)user_handler();
simonis@6465:     break;
simonis@6465: 
simonis@6465:   case INTERRUPT_SIGNAL:
simonis@6465:     jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
simonis@6465:     break;
simonis@6465: 
simonis@6465:   default:
simonis@6465:     if (sig == SR_signum) {
simonis@6465:       jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
simonis@6465:     } else {
simonis@6465:       return;
simonis@6465:     }
simonis@6465:     break;
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (thisHandler != jvmHandler) {
simonis@6465:     tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
simonis@6465:     tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
simonis@6465:     tty->print_cr("  found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
simonis@6465:     // No need to check this sig any longer
simonis@6465:     sigaddset(&check_signal_done, sig);
simonis@6465:   } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
simonis@6465:     tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
simonis@6465:     tty->print("expected:" PTR32_FORMAT, os::Aix::get_our_sigflags(sig));
simonis@6465:     tty->print_cr("  found:" PTR32_FORMAT, act.sa_flags);
simonis@6465:     // No need to check this sig any longer
simonis@6465:     sigaddset(&check_signal_done, sig);
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Dump all the signal
simonis@6465:   if (sigismember(&check_signal_done, sig)) {
simonis@6465:     print_signal_handlers(tty, buf, O_BUFLEN);
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: extern bool signal_name(int signo, char* buf, size_t len);
simonis@6465: 
simonis@6465: const char* os::exception_name(int exception_code, char* buf, size_t size) {
simonis@6465:   if (0 < exception_code && exception_code <= SIGRTMAX) {
simonis@6465:     // signal
simonis@6465:     if (!signal_name(exception_code, buf, size)) {
simonis@6465:       jio_snprintf(buf, size, "SIG%d", exception_code);
simonis@6465:     }
simonis@6465:     return buf;
simonis@6465:   } else {
simonis@6465:     return NULL;
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: // To install functions for atexit system call
simonis@6465: extern "C" {
simonis@6465:   static void perfMemory_exit_helper() {
simonis@6465:     perfMemory_exit();
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: // This is called _before_ the most of global arguments have been parsed.
simonis@6465: void os::init(void) {
simonis@6465:   // This is basic, we want to know if that ever changes.
simonis@6465:   // (shared memory boundary is supposed to be a 256M aligned)
simonis@6465:   assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
simonis@6465: 
simonis@6465:   // First off, we need to know whether we run on AIX or PASE, and
simonis@6465:   // the OS level we run on.
simonis@6465:   os::Aix::initialize_os_info();
simonis@6465: 
simonis@6465:   // Scan environment (SPEC1170 behaviour, etc)
simonis@6465:   os::Aix::scan_environment();
simonis@6465: 
simonis@6465:   // Check which pages are supported by AIX.
simonis@6465:   os::Aix::query_multipage_support();
simonis@6465: 
simonis@6465:   // Next, we need to initialize libo4 and libperfstat libraries.
simonis@6465:   if (os::Aix::on_pase()) {
simonis@6465:     os::Aix::initialize_libo4();
simonis@6465:   } else {
simonis@6465:     os::Aix::initialize_libperfstat();
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Reset the perfstat information provided by ODM.
simonis@6465:   if (os::Aix::on_aix()) {
simonis@6465:     libperfstat::perfstat_reset();
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Now initialze basic system properties. Note that for some of the values we
simonis@6465:   // need libperfstat etc.
simonis@6465:   os::Aix::initialize_system_info();
simonis@6465: 
simonis@6465:   // Initialize large page support.
simonis@6465:   if (UseLargePages) {
simonis@6465:     os::large_page_init();
simonis@6465:     if (!UseLargePages) {
simonis@6465:       // initialize os::_page_sizes
simonis@6465:       _page_sizes[0] = Aix::page_size();
simonis@6465:       _page_sizes[1] = 0;
simonis@6465:       if (Verbose) {
simonis@6465:         fprintf(stderr, "Large Page initialization failed: setting UseLargePages=0.\n");
simonis@6465:       }
simonis@6465:     }
simonis@6465:   } else {
simonis@6465:     // initialize os::_page_sizes
simonis@6465:     _page_sizes[0] = Aix::page_size();
simonis@6465:     _page_sizes[1] = 0;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // debug trace
simonis@6465:   if (Verbose) {
simonis@6465:     fprintf(stderr, "os::vm_page_size 0x%llX\n", os::vm_page_size());
simonis@6465:     fprintf(stderr, "os::large_page_size 0x%llX\n", os::large_page_size());
simonis@6465:     fprintf(stderr, "os::_page_sizes = ( ");
simonis@6465:     for (int i = 0; _page_sizes[i]; i ++) {
simonis@6465:       fprintf(stderr, " %s ", describe_pagesize(_page_sizes[i]));
simonis@6465:     }
simonis@6465:     fprintf(stderr, ")\n");
simonis@6465:   }
simonis@6465: 
simonis@6465:   _initial_pid = getpid();
simonis@6465: 
simonis@6465:   clock_tics_per_sec = sysconf(_SC_CLK_TCK);
simonis@6465: 
simonis@6465:   init_random(1234567);
simonis@6465: 
simonis@6465:   ThreadCritical::initialize();
simonis@6465: 
simonis@6465:   // Main_thread points to the aboriginal thread.
simonis@6465:   Aix::_main_thread = pthread_self();
simonis@6465: 
simonis@6465:   initial_time_count = os::elapsed_counter();
simonis@6465:   pthread_mutex_init(&dl_mutex, NULL);
simonis@6465: }
simonis@6465: 
simonis@6465: // this is called _after_ the global arguments have been parsed
simonis@6465: jint os::init_2(void) {
simonis@6465: 
simonis@6465:   if (Verbose) {
simonis@6465:     fprintf(stderr, "processor count: %d\n", os::_processor_count);
simonis@6465:     fprintf(stderr, "physical memory: %lu\n", Aix::_physical_memory);
simonis@6465:   }
simonis@6465: 
simonis@6465:   // initially build up the loaded dll map
simonis@6465:   LoadedLibraries::reload();
simonis@6465: 
simonis@6465:   const int page_size = Aix::page_size();
simonis@6465:   const int map_size = page_size;
simonis@6465: 
simonis@6465:   address map_address = (address) MAP_FAILED;
simonis@6465:   const int prot  = PROT_READ;
simonis@6465:   const int flags = MAP_PRIVATE|MAP_ANONYMOUS;
simonis@6465: 
simonis@6465:   // use optimized addresses for the polling page,
simonis@6465:   // e.g. map it to a special 32-bit address.
simonis@6465:   if (OptimizePollingPageLocation) {
simonis@6465:     // architecture-specific list of address wishes:
simonis@6465:     address address_wishes[] = {
simonis@6465:       // AIX: addresses lower than 0x30000000 don't seem to work on AIX.
simonis@6465:       // PPC64: all address wishes are non-negative 32 bit values where
simonis@6465:       // the lower 16 bits are all zero. we can load these addresses
simonis@6465:       // with a single ppc_lis instruction.
simonis@6465:       (address) 0x30000000, (address) 0x31000000,
simonis@6465:       (address) 0x32000000, (address) 0x33000000,
simonis@6465:       (address) 0x40000000, (address) 0x41000000,
simonis@6465:       (address) 0x42000000, (address) 0x43000000,
simonis@6465:       (address) 0x50000000, (address) 0x51000000,
simonis@6465:       (address) 0x52000000, (address) 0x53000000,
simonis@6465:       (address) 0x60000000, (address) 0x61000000,
simonis@6465:       (address) 0x62000000, (address) 0x63000000
simonis@6465:     };
simonis@6465:     int address_wishes_length = sizeof(address_wishes)/sizeof(address);
simonis@6465: 
simonis@6465:     // iterate over the list of address wishes:
simonis@6465:     for (int i=0; i<address_wishes_length; i++) {
simonis@6465:       // try to map with current address wish.
simonis@6465:       // AIX: AIX needs MAP_FIXED if we provide an address and mmap will
simonis@6465:       // fail if the address is already mapped.
simonis@6465:       map_address = (address) ::mmap(address_wishes[i] - (ssize_t)page_size,
simonis@6465:                                      map_size, prot,
simonis@6465:                                      flags | MAP_FIXED,
simonis@6465:                                      -1, 0);
simonis@6465:       if (Verbose) {
simonis@6465:         fprintf(stderr, "SafePoint Polling Page address: %p (wish) => %p\n",
simonis@6465:                 address_wishes[i], map_address + (ssize_t)page_size);
simonis@6465:       }
simonis@6465: 
simonis@6465:       if (map_address + (ssize_t)page_size == address_wishes[i]) {
simonis@6465:         // map succeeded and map_address is at wished address, exit loop.
simonis@6465:         break;
simonis@6465:       }
simonis@6465: 
simonis@6465:       if (map_address != (address) MAP_FAILED) {
simonis@6465:         // map succeeded, but polling_page is not at wished address, unmap and continue.
simonis@6465:         ::munmap(map_address, map_size);
simonis@6465:         map_address = (address) MAP_FAILED;
simonis@6465:       }
simonis@6465:       // map failed, continue loop.
simonis@6465:     }
simonis@6465:   } // end OptimizePollingPageLocation
simonis@6465: 
simonis@6465:   if (map_address == (address) MAP_FAILED) {
simonis@6465:     map_address = (address) ::mmap(NULL, map_size, prot, flags, -1, 0);
simonis@6465:   }
simonis@6465:   guarantee(map_address != MAP_FAILED, "os::init_2: failed to allocate polling page");
simonis@6465:   os::set_polling_page(map_address);
simonis@6465: 
simonis@6465:   if (!UseMembar) {
simonis@6465:     address mem_serialize_page = (address) ::mmap(NULL, Aix::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
simonis@6465:     guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
simonis@6465:     os::set_memory_serialize_page(mem_serialize_page);
simonis@6465: 
simonis@6465: #ifndef PRODUCT
simonis@6465:     if (Verbose && PrintMiscellaneous)
simonis@6465:       tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
simonis@6465: #endif
simonis@6465:   }
simonis@6465: 
simonis@6465:   // initialize suspend/resume support - must do this before signal_sets_init()
simonis@6465:   if (SR_initialize() != 0) {
simonis@6465:     perror("SR_initialize failed");
simonis@6465:     return JNI_ERR;
simonis@6465:   }
simonis@6465: 
simonis@6465:   Aix::signal_sets_init();
simonis@6465:   Aix::install_signal_handlers();
simonis@6465: 
simonis@6465:   // Check minimum allowable stack size for thread creation and to initialize
simonis@6465:   // the java system classes, including StackOverflowError - depends on page
simonis@6465:   // size. Add a page for compiler2 recursion in main thread.
simonis@6465:   // Add in 2*BytesPerWord times page size to account for VM stack during
simonis@6465:   // class initialization depending on 32 or 64 bit VM.
simonis@6465:   os::Aix::min_stack_allowed = MAX2(os::Aix::min_stack_allowed,
simonis@6465:             (size_t)(StackYellowPages+StackRedPages+StackShadowPages +
simonis@6465:                      2*BytesPerWord COMPILER2_PRESENT(+1)) * Aix::page_size());
simonis@6465: 
simonis@6465:   size_t threadStackSizeInBytes = ThreadStackSize * K;
simonis@6465:   if (threadStackSizeInBytes != 0 &&
simonis@6465:       threadStackSizeInBytes < os::Aix::min_stack_allowed) {
simonis@6465:         tty->print_cr("\nThe stack size specified is too small, "
simonis@6465:                       "Specify at least %dk",
simonis@6465:                       os::Aix::min_stack_allowed / K);
simonis@6465:         return JNI_ERR;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Make the stack size a multiple of the page size so that
simonis@6465:   // the yellow/red zones can be guarded.
simonis@6465:   // note that this can be 0, if no default stacksize was set
simonis@6465:   JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, vm_page_size()));
simonis@6465: 
simonis@6465:   Aix::libpthread_init();
simonis@6465: 
simonis@6465:   if (MaxFDLimit) {
simonis@6465:     // set the number of file descriptors to max. print out error
simonis@6465:     // if getrlimit/setrlimit fails but continue regardless.
simonis@6465:     struct rlimit nbr_files;
simonis@6465:     int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
simonis@6465:     if (status != 0) {
simonis@6465:       if (PrintMiscellaneous && (Verbose || WizardMode))
simonis@6465:         perror("os::init_2 getrlimit failed");
simonis@6465:     } else {
simonis@6465:       nbr_files.rlim_cur = nbr_files.rlim_max;
simonis@6465:       status = setrlimit(RLIMIT_NOFILE, &nbr_files);
simonis@6465:       if (status != 0) {
simonis@6465:         if (PrintMiscellaneous && (Verbose || WizardMode))
simonis@6465:           perror("os::init_2 setrlimit failed");
simonis@6465:       }
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (PerfAllowAtExitRegistration) {
simonis@6465:     // only register atexit functions if PerfAllowAtExitRegistration is set.
simonis@6465:     // atexit functions can be delayed until process exit time, which
simonis@6465:     // can be problematic for embedded VM situations. Embedded VMs should
simonis@6465:     // call DestroyJavaVM() to assure that VM resources are released.
simonis@6465: 
simonis@6465:     // note: perfMemory_exit_helper atexit function may be removed in
simonis@6465:     // the future if the appropriate cleanup code can be added to the
simonis@6465:     // VM_Exit VMOperation's doit method.
simonis@6465:     if (atexit(perfMemory_exit_helper) != 0) {
simonis@6465:       warning("os::init_2 atexit(perfMemory_exit_helper) failed");
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   return JNI_OK;
simonis@6465: }
simonis@6465: 
simonis@6465: // this is called at the end of vm_initialization
simonis@6465: void os::init_3(void) {
simonis@6465:   return;
simonis@6465: }
simonis@6465: 
simonis@6465: // Mark the polling page as unreadable
simonis@6465: void os::make_polling_page_unreadable(void) {
simonis@6465:   if (!guard_memory((char*)_polling_page, Aix::page_size())) {
simonis@6465:     fatal("Could not disable polling page");
simonis@6465:   }
simonis@6465: };
simonis@6465: 
simonis@6465: // Mark the polling page as readable
simonis@6465: void os::make_polling_page_readable(void) {
simonis@6465:   // Changed according to os_linux.cpp.
simonis@6465:   if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
simonis@6465:     fatal(err_msg("Could not enable polling page at " PTR_FORMAT, _polling_page));
simonis@6465:   }
simonis@6465: };
simonis@6465: 
simonis@6465: int os::active_processor_count() {
simonis@6465:   int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
simonis@6465:   assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
simonis@6465:   return online_cpus;
simonis@6465: }
simonis@6465: 
simonis@6465: void os::set_native_thread_name(const char *name) {
simonis@6465:   // Not yet implemented.
simonis@6465:   return;
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::distribute_processes(uint length, uint* distribution) {
simonis@6465:   // Not yet implemented.
simonis@6465:   return false;
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::bind_to_processor(uint processor_id) {
simonis@6465:   // Not yet implemented.
simonis@6465:   return false;
simonis@6465: }
simonis@6465: 
simonis@6465: void os::SuspendedThreadTask::internal_do_task() {
simonis@6465:   if (do_suspend(_thread->osthread())) {
simonis@6465:     SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
simonis@6465:     do_task(context);
simonis@6465:     do_resume(_thread->osthread());
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: class PcFetcher : public os::SuspendedThreadTask {
simonis@6465: public:
simonis@6465:   PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
simonis@6465:   ExtendedPC result();
simonis@6465: protected:
simonis@6465:   void do_task(const os::SuspendedThreadTaskContext& context);
simonis@6465: private:
simonis@6465:   ExtendedPC _epc;
simonis@6465: };
simonis@6465: 
simonis@6465: ExtendedPC PcFetcher::result() {
simonis@6465:   guarantee(is_done(), "task is not done yet.");
simonis@6465:   return _epc;
simonis@6465: }
simonis@6465: 
simonis@6465: void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
simonis@6465:   Thread* thread = context.thread();
simonis@6465:   OSThread* osthread = thread->osthread();
simonis@6465:   if (osthread->ucontext() != NULL) {
simonis@6465:     _epc = os::Aix::ucontext_get_pc((ucontext_t *) context.ucontext());
simonis@6465:   } else {
simonis@6465:     // NULL context is unexpected, double-check this is the VMThread.
simonis@6465:     guarantee(thread->is_VM_thread(), "can only be called for VMThread");
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: // Suspends the target using the signal mechanism and then grabs the PC before
simonis@6465: // resuming the target. Used by the flat-profiler only
simonis@6465: ExtendedPC os::get_thread_pc(Thread* thread) {
simonis@6465:   // Make sure that it is called by the watcher for the VMThread.
simonis@6465:   assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
simonis@6465:   assert(thread->is_VM_thread(), "Can only be called for VMThread");
simonis@6465: 
simonis@6465:   PcFetcher fetcher(thread);
simonis@6465:   fetcher.run();
simonis@6465:   return fetcher.result();
simonis@6465: }
simonis@6465: 
simonis@6465: // Not neede on Aix.
simonis@6465: // int os::Aix::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) {
simonis@6465: // }
simonis@6465: 
simonis@6465: ////////////////////////////////////////////////////////////////////////////////
simonis@6465: // debug support
simonis@6465: 
simonis@6465: static address same_page(address x, address y) {
simonis@6465:   intptr_t page_bits = -os::vm_page_size();
simonis@6465:   if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
simonis@6465:     return x;
simonis@6465:   else if (x > y)
simonis@6465:     return (address)(intptr_t(y) | ~page_bits) + 1;
simonis@6465:   else
simonis@6465:     return (address)(intptr_t(y) & page_bits);
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::find(address addr, outputStream* st) {
simonis@6465:   Unimplemented();
simonis@6465:   return false;
simonis@6465: }
simonis@6465: 
simonis@6465: ////////////////////////////////////////////////////////////////////////////////
simonis@6465: // misc
simonis@6465: 
simonis@6465: // This does not do anything on Aix. This is basically a hook for being
simonis@6465: // able to use structured exception handling (thread-local exception filters)
simonis@6465: // on, e.g., Win32.
simonis@6465: void
simonis@6465: os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
simonis@6465:                          JavaCallArguments* args, Thread* thread) {
simonis@6465:   f(value, method, args, thread);
simonis@6465: }
simonis@6465: 
simonis@6465: void os::print_statistics() {
simonis@6465: }
simonis@6465: 
simonis@6465: int os::message_box(const char* title, const char* message) {
simonis@6465:   int i;
simonis@6465:   fdStream err(defaultStream::error_fd());
simonis@6465:   for (i = 0; i < 78; i++) err.print_raw("=");
simonis@6465:   err.cr();
simonis@6465:   err.print_raw_cr(title);
simonis@6465:   for (i = 0; i < 78; i++) err.print_raw("-");
simonis@6465:   err.cr();
simonis@6465:   err.print_raw_cr(message);
simonis@6465:   for (i = 0; i < 78; i++) err.print_raw("=");
simonis@6465:   err.cr();
simonis@6465: 
simonis@6465:   char buf[16];
simonis@6465:   // Prevent process from exiting upon "read error" without consuming all CPU
simonis@6465:   while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
simonis@6465: 
simonis@6465:   return buf[0] == 'y' || buf[0] == 'Y';
simonis@6465: }
simonis@6465: 
simonis@6465: int os::stat(const char *path, struct stat *sbuf) {
simonis@6465:   char pathbuf[MAX_PATH];
simonis@6465:   if (strlen(path) > MAX_PATH - 1) {
simonis@6465:     errno = ENAMETOOLONG;
simonis@6465:     return -1;
simonis@6465:   }
simonis@6465:   os::native_path(strcpy(pathbuf, path));
simonis@6465:   return ::stat(pathbuf, sbuf);
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::check_heap(bool force) {
simonis@6465:   return true;
simonis@6465: }
simonis@6465: 
simonis@6465: // int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) {
simonis@6465: //   return ::vsnprintf(buf, count, format, args);
simonis@6465: // }
simonis@6465: 
simonis@6465: // Is a (classpath) directory empty?
simonis@6465: bool os::dir_is_empty(const char* path) {
simonis@6465:   Unimplemented();
simonis@6465:   return false;
simonis@6465: }
simonis@6465: 
simonis@6465: // This code originates from JDK's sysOpen and open64_w
simonis@6465: // from src/solaris/hpi/src/system_md.c
simonis@6465: 
simonis@6465: #ifndef O_DELETE
simonis@6465: #define O_DELETE 0x10000
simonis@6465: #endif
simonis@6465: 
simonis@6465: // Open a file. Unlink the file immediately after open returns
simonis@6465: // if the specified oflag has the O_DELETE flag set.
simonis@6465: // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
simonis@6465: 
simonis@6465: int os::open(const char *path, int oflag, int mode) {
simonis@6465: 
simonis@6465:   if (strlen(path) > MAX_PATH - 1) {
simonis@6465:     errno = ENAMETOOLONG;
simonis@6465:     return -1;
simonis@6465:   }
simonis@6465:   int fd;
simonis@6465:   int o_delete = (oflag & O_DELETE);
simonis@6465:   oflag = oflag & ~O_DELETE;
simonis@6465: 
simonis@6465:   fd = ::open64(path, oflag, mode);
simonis@6465:   if (fd == -1) return -1;
simonis@6465: 
simonis@6465:   //If the open succeeded, the file might still be a directory
simonis@6465:   {
simonis@6465:     struct stat64 buf64;
simonis@6465:     int ret = ::fstat64(fd, &buf64);
simonis@6465:     int st_mode = buf64.st_mode;
simonis@6465: 
simonis@6465:     if (ret != -1) {
simonis@6465:       if ((st_mode & S_IFMT) == S_IFDIR) {
simonis@6465:         errno = EISDIR;
simonis@6465:         ::close(fd);
simonis@6465:         return -1;
simonis@6465:       }
simonis@6465:     } else {
simonis@6465:       ::close(fd);
simonis@6465:       return -1;
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   // All file descriptors that are opened in the JVM and not
simonis@6465:   // specifically destined for a subprocess should have the
simonis@6465:   // close-on-exec flag set. If we don't set it, then careless 3rd
simonis@6465:   // party native code might fork and exec without closing all
simonis@6465:   // appropriate file descriptors (e.g. as we do in closeDescriptors in
simonis@6465:   // UNIXProcess.c), and this in turn might:
simonis@6465:   //
simonis@6465:   // - cause end-of-file to fail to be detected on some file
simonis@6465:   //   descriptors, resulting in mysterious hangs, or
simonis@6465:   //
simonis@6465:   // - might cause an fopen in the subprocess to fail on a system
simonis@6465:   //   suffering from bug 1085341.
simonis@6465:   //
simonis@6465:   // (Yes, the default setting of the close-on-exec flag is a Unix
simonis@6465:   // design flaw.)
simonis@6465:   //
simonis@6465:   // See:
simonis@6465:   // 1085341: 32-bit stdio routines should support file descriptors >255
simonis@6465:   // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
simonis@6465:   // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
simonis@6465: #ifdef FD_CLOEXEC
simonis@6465:   {
simonis@6465:     int flags = ::fcntl(fd, F_GETFD);
simonis@6465:     if (flags != -1)
simonis@6465:       ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
simonis@6465:   }
simonis@6465: #endif
simonis@6465: 
simonis@6465:   if (o_delete != 0) {
simonis@6465:     ::unlink(path);
simonis@6465:   }
simonis@6465:   return fd;
simonis@6465: }
simonis@6465: 
simonis@6465: 
simonis@6465: // create binary file, rewriting existing file if required
simonis@6465: int os::create_binary_file(const char* path, bool rewrite_existing) {
simonis@6465:   Unimplemented();
simonis@6465:   return 0;
simonis@6465: }
simonis@6465: 
simonis@6465: // return current position of file pointer
simonis@6465: jlong os::current_file_offset(int fd) {
simonis@6465:   return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
simonis@6465: }
simonis@6465: 
simonis@6465: // move file pointer to the specified offset
simonis@6465: jlong os::seek_to_file_offset(int fd, jlong offset) {
simonis@6465:   return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
simonis@6465: }
simonis@6465: 
simonis@6465: // This code originates from JDK's sysAvailable
simonis@6465: // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
simonis@6465: 
simonis@6465: int os::available(int fd, jlong *bytes) {
simonis@6465:   jlong cur, end;
simonis@6465:   int mode;
simonis@6465:   struct stat64 buf64;
simonis@6465: 
simonis@6465:   if (::fstat64(fd, &buf64) >= 0) {
simonis@6465:     mode = buf64.st_mode;
simonis@6465:     if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
simonis@6465:       // XXX: is the following call interruptible? If so, this might
simonis@6465:       // need to go through the INTERRUPT_IO() wrapper as for other
simonis@6465:       // blocking, interruptible calls in this file.
simonis@6465:       int n;
simonis@6465:       if (::ioctl(fd, FIONREAD, &n) >= 0) {
simonis@6465:         *bytes = n;
simonis@6465:         return 1;
simonis@6465:       }
simonis@6465:     }
simonis@6465:   }
simonis@6465:   if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
simonis@6465:     return 0;
simonis@6465:   } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
simonis@6465:     return 0;
simonis@6465:   } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
simonis@6465:     return 0;
simonis@6465:   }
simonis@6465:   *bytes = end - cur;
simonis@6465:   return 1;
simonis@6465: }
simonis@6465: 
simonis@6465: int os::socket_available(int fd, jint *pbytes) {
simonis@6465:   // Linux doc says EINTR not returned, unlike Solaris
simonis@6465:   int ret = ::ioctl(fd, FIONREAD, pbytes);
simonis@6465: 
simonis@6465:   //%% note ioctl can return 0 when successful, JVM_SocketAvailable
simonis@6465:   // is expected to return 0 on failure and 1 on success to the jdk.
simonis@6465:   return (ret < 0) ? 0 : 1;
simonis@6465: }
simonis@6465: 
simonis@6465: // Map a block of memory.
simonis@6465: char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
simonis@6465:                         char *addr, size_t bytes, bool read_only,
simonis@6465:                         bool allow_exec) {
simonis@6465:   Unimplemented();
simonis@6465:   return NULL;
simonis@6465: }
simonis@6465: 
simonis@6465: 
simonis@6465: // Remap a block of memory.
simonis@6465: char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
simonis@6465:                           char *addr, size_t bytes, bool read_only,
simonis@6465:                           bool allow_exec) {
simonis@6465:   // same as map_memory() on this OS
simonis@6465:   return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
simonis@6465:                         allow_exec);
simonis@6465: }
simonis@6465: 
simonis@6465: // Unmap a block of memory.
simonis@6465: bool os::pd_unmap_memory(char* addr, size_t bytes) {
simonis@6465:   return munmap(addr, bytes) == 0;
simonis@6465: }
simonis@6465: 
simonis@6465: // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
simonis@6465: // are used by JVM M&M and JVMTI to get user+sys or user CPU time
simonis@6465: // of a thread.
simonis@6465: //
simonis@6465: // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
simonis@6465: // the fast estimate available on the platform.
simonis@6465: 
simonis@6465: jlong os::current_thread_cpu_time() {
simonis@6465:   // return user + sys since the cost is the same
simonis@6465:   const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
simonis@6465:   assert(n >= 0, "negative CPU time");
simonis@6465:   return n;
simonis@6465: }
simonis@6465: 
simonis@6465: jlong os::thread_cpu_time(Thread* thread) {
simonis@6465:   // consistent with what current_thread_cpu_time() returns
simonis@6465:   const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
simonis@6465:   assert(n >= 0, "negative CPU time");
simonis@6465:   return n;
simonis@6465: }
simonis@6465: 
simonis@6465: jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
simonis@6465:   const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
simonis@6465:   assert(n >= 0, "negative CPU time");
simonis@6465:   return n;
simonis@6465: }
simonis@6465: 
simonis@6465: static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
simonis@6465:   bool error = false;
simonis@6465: 
simonis@6465:   jlong sys_time = 0;
simonis@6465:   jlong user_time = 0;
simonis@6465: 
simonis@6465:   // reimplemented using getthrds64().
simonis@6465:   //
simonis@6465:   // goes like this:
simonis@6465:   // For the thread in question, get the kernel thread id. Then get the
simonis@6465:   // kernel thread statistics using that id.
simonis@6465:   //
simonis@6465:   // This only works of course when no pthread scheduling is used,
simonis@6465:   // ie there is a 1:1 relationship to kernel threads.
simonis@6465:   // On AIX, see AIXTHREAD_SCOPE variable.
simonis@6465: 
simonis@6465:   pthread_t pthtid = thread->osthread()->pthread_id();
simonis@6465: 
simonis@6465:   // retrieve kernel thread id for the pthread:
simonis@6465:   tid64_t tid = 0;
simonis@6465:   struct __pthrdsinfo pinfo;
simonis@6465:   // I just love those otherworldly IBM APIs which force me to hand down
simonis@6465:   // dummy buffers for stuff I dont care for...
simonis@6465:   char dummy[1];
simonis@6465:   int dummy_size = sizeof(dummy);
simonis@6465:   if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
simonis@6465:                           dummy, &dummy_size) == 0) {
simonis@6465:     tid = pinfo.__pi_tid;
simonis@6465:   } else {
simonis@6465:     tty->print_cr("pthread_getthrds_np failed.");
simonis@6465:     error = true;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // retrieve kernel timing info for that kernel thread
simonis@6465:   if (!error) {
simonis@6465:     struct thrdentry64 thrdentry;
simonis@6465:     if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
simonis@6465:       sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
simonis@6465:       user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
simonis@6465:     } else {
simonis@6465:       tty->print_cr("pthread_getthrds_np failed.");
simonis@6465:       error = true;
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (p_sys_time) {
simonis@6465:     *p_sys_time = sys_time;
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (p_user_time) {
simonis@6465:     *p_user_time = user_time;
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (error) {
simonis@6465:     return false;
simonis@6465:   }
simonis@6465: 
simonis@6465:   return true;
simonis@6465: }
simonis@6465: 
simonis@6465: jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
simonis@6465:   jlong sys_time;
simonis@6465:   jlong user_time;
simonis@6465: 
simonis@6465:   if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
simonis@6465:     return -1;
simonis@6465:   }
simonis@6465: 
simonis@6465:   return user_sys_cpu_time ? sys_time + user_time : user_time;
simonis@6465: }
simonis@6465: 
simonis@6465: void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
simonis@6465:   info_ptr->max_value = ALL_64_BITS;       // will not wrap in less than 64 bits
simonis@6465:   info_ptr->may_skip_backward = false;     // elapsed time not wall time
simonis@6465:   info_ptr->may_skip_forward = false;      // elapsed time not wall time
simonis@6465:   info_ptr->kind = JVMTI_TIMER_TOTAL_CPU;  // user+system time is returned
simonis@6465: }
simonis@6465: 
simonis@6465: void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
simonis@6465:   info_ptr->max_value = ALL_64_BITS;       // will not wrap in less than 64 bits
simonis@6465:   info_ptr->may_skip_backward = false;     // elapsed time not wall time
simonis@6465:   info_ptr->may_skip_forward = false;      // elapsed time not wall time
simonis@6465:   info_ptr->kind = JVMTI_TIMER_TOTAL_CPU;  // user+system time is returned
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::is_thread_cpu_time_supported() {
simonis@6465:   return true;
simonis@6465: }
simonis@6465: 
simonis@6465: // System loadavg support. Returns -1 if load average cannot be obtained.
simonis@6465: // For now just return the system wide load average (no processor sets).
simonis@6465: int os::loadavg(double values[], int nelem) {
simonis@6465: 
simonis@6465:   // Implemented using libperfstat on AIX.
simonis@6465: 
simonis@6465:   guarantee(nelem >= 0 && nelem <= 3, "argument error");
simonis@6465:   guarantee(values, "argument error");
simonis@6465: 
simonis@6465:   if (os::Aix::on_pase()) {
simonis@6465:     Unimplemented();
simonis@6465:     return -1;
simonis@6465:   } else {
simonis@6465:     // AIX: use libperfstat
simonis@6465:     //
simonis@6465:     // See also:
simonis@6465:     // http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_cputot.htm
simonis@6465:     // /usr/include/libperfstat.h:
simonis@6465: 
simonis@6465:     // Use the already AIX version independent get_cpuinfo.
simonis@6465:     os::Aix::cpuinfo_t ci;
simonis@6465:     if (os::Aix::get_cpuinfo(&ci)) {
simonis@6465:       for (int i = 0; i < nelem; i++) {
simonis@6465:         values[i] = ci.loadavg[i];
simonis@6465:       }
simonis@6465:     } else {
simonis@6465:       return -1;
simonis@6465:     }
simonis@6465:     return nelem;
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: void os::pause() {
simonis@6465:   char filename[MAX_PATH];
simonis@6465:   if (PauseAtStartupFile && PauseAtStartupFile[0]) {
simonis@6465:     jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
simonis@6465:   } else {
simonis@6465:     jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
simonis@6465:   }
simonis@6465: 
simonis@6465:   int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
simonis@6465:   if (fd != -1) {
simonis@6465:     struct stat buf;
simonis@6465:     ::close(fd);
simonis@6465:     while (::stat(filename, &buf) == 0) {
simonis@6465:       (void)::poll(NULL, 0, 100);
simonis@6465:     }
simonis@6465:   } else {
simonis@6465:     jio_fprintf(stderr,
simonis@6465:       "Could not open pause file '%s', continuing immediately.\n", filename);
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: bool os::Aix::is_primordial_thread() {
simonis@6465:   if (pthread_self() == (pthread_t)1) {
simonis@6465:     return true;
simonis@6465:   } else {
simonis@6465:     return false;
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: // OS recognitions (PASE/AIX, OS level) call this before calling any
simonis@6465: // one of Aix::on_pase(), Aix::os_version() static
simonis@6465: void os::Aix::initialize_os_info() {
simonis@6465: 
simonis@6465:   assert(_on_pase == -1 && _os_version == -1, "already called.");
simonis@6465: 
simonis@6465:   struct utsname uts;
simonis@6465:   memset(&uts, 0, sizeof(uts));
simonis@6465:   strcpy(uts.sysname, "?");
simonis@6465:   if (::uname(&uts) == -1) {
simonis@6465:     fprintf(stderr, "uname failed (%d)\n", errno);
simonis@6465:     guarantee(0, "Could not determine whether we run on AIX or PASE");
simonis@6465:   } else {
simonis@6465:     if (Verbose) {
simonis@6465:       fprintf(stderr,"uname says: sysname \"%s\" version \"%s\" release \"%s\" "
simonis@6465:               "node \"%s\" machine \"%s\"\n",
simonis@6465:               uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
simonis@6465:     }
simonis@6465:     const int major = atoi(uts.version);
simonis@6465:     assert(major > 0, "invalid OS version");
simonis@6465:     const int minor = atoi(uts.release);
simonis@6465:     assert(minor > 0, "invalid OS release");
simonis@6465:     _os_version = (major << 8) | minor;
simonis@6465:     if (strcmp(uts.sysname, "OS400") == 0) {
simonis@6465:       Unimplemented();
simonis@6465:     } else if (strcmp(uts.sysname, "AIX") == 0) {
simonis@6465:       // We run on AIX. We do not support versions older than AIX 5.3.
simonis@6465:       _on_pase = 0;
simonis@6465:       if (_os_version < 0x0503) {
simonis@6465:         fprintf(stderr, "AIX release older than AIX 5.3 not supported.\n");
simonis@6465:         assert(false, "AIX release too old.");
simonis@6465:       } else {
simonis@6465:         if (Verbose) {
simonis@6465:           fprintf(stderr, "We run on AIX %d.%d\n", major, minor);
simonis@6465:         }
simonis@6465:       }
simonis@6465:     } else {
simonis@6465:       assert(false, "unknown OS");
simonis@6465:     }
simonis@6465:   }
simonis@6465: 
simonis@6465:   guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
simonis@6465: 
simonis@6465: } // end: os::Aix::initialize_os_info()
simonis@6465: 
simonis@6465: // Scan environment for important settings which might effect the VM.
simonis@6465: // Trace out settings. Warn about invalid settings and/or correct them.
simonis@6465: //
simonis@6465: // Must run after os::Aix::initialue_os_info().
simonis@6465: void os::Aix::scan_environment() {
simonis@6465: 
simonis@6465:   char* p;
simonis@6465:   int rc;
simonis@6465: 
simonis@6465:   // Warn explicity if EXTSHM=ON is used. That switch changes how
simonis@6465:   // System V shared memory behaves. One effect is that page size of
simonis@6465:   // shared memory cannot be change dynamically, effectivly preventing
simonis@6465:   // large pages from working.
simonis@6465:   // This switch was needed on AIX 32bit, but on AIX 64bit the general
simonis@6465:   // recommendation is (in OSS notes) to switch it off.
simonis@6465:   p = ::getenv("EXTSHM");
simonis@6465:   if (Verbose) {
simonis@6465:     fprintf(stderr, "EXTSHM=%s.\n", p ? p : "<unset>");
simonis@6465:   }
simonis@6465:   if (p && strcmp(p, "ON") == 0) {
simonis@6465:     fprintf(stderr, "Unsupported setting: EXTSHM=ON. Large Page support will be disabled.\n");
simonis@6465:     _extshm = 1;
simonis@6465:   } else {
simonis@6465:     _extshm = 0;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
simonis@6465:   // Not tested, not supported.
simonis@6465:   //
simonis@6465:   // Note that it might be worth the trouble to test and to require it, if only to
simonis@6465:   // get useful return codes for mprotect.
simonis@6465:   //
simonis@6465:   // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
simonis@6465:   // exec() ? before loading the libjvm ? ....)
simonis@6465:   p = ::getenv("XPG_SUS_ENV");
simonis@6465:   if (Verbose) {
simonis@6465:     fprintf(stderr, "XPG_SUS_ENV=%s.\n", p ? p : "<unset>");
simonis@6465:   }
simonis@6465:   if (p && strcmp(p, "ON") == 0) {
simonis@6465:     _xpg_sus_mode = 1;
simonis@6465:     fprintf(stderr, "Unsupported setting: XPG_SUS_ENV=ON\n");
simonis@6465:     // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
simonis@6465:     // clobber address ranges. If we ever want to support that, we have to do some
simonis@6465:     // testing first.
simonis@6465:     guarantee(false, "XPG_SUS_ENV=ON not supported");
simonis@6465:   } else {
simonis@6465:     _xpg_sus_mode = 0;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Switch off AIX internal (pthread) guard pages. This has
simonis@6465:   // immediate effect for any pthread_create calls which follow.
simonis@6465:   p = ::getenv("AIXTHREAD_GUARDPAGES");
simonis@6465:   if (Verbose) {
simonis@6465:     fprintf(stderr, "AIXTHREAD_GUARDPAGES=%s.\n", p ? p : "<unset>");
simonis@6465:     fprintf(stderr, "setting AIXTHREAD_GUARDPAGES=0.\n");
simonis@6465:   }
simonis@6465:   rc = ::putenv("AIXTHREAD_GUARDPAGES=0");
simonis@6465:   guarantee(rc == 0, "");
simonis@6465: 
simonis@6465: } // end: os::Aix::scan_environment()
simonis@6465: 
simonis@6465: // PASE: initialize the libo4 library (AS400 PASE porting library).
simonis@6465: void os::Aix::initialize_libo4() {
simonis@6465:   Unimplemented();
simonis@6465: }
simonis@6465: 
simonis@6465: // AIX: initialize the libperfstat library (we load this dynamically
simonis@6465: // because it is only available on AIX.
simonis@6465: void os::Aix::initialize_libperfstat() {
simonis@6465: 
simonis@6465:   assert(os::Aix::on_aix(), "AIX only");
simonis@6465: 
simonis@6465:   if (!libperfstat::init()) {
simonis@6465:     fprintf(stderr, "libperfstat initialization failed.\n");
simonis@6465:     assert(false, "libperfstat initialization failed");
simonis@6465:   } else {
simonis@6465:     if (Verbose) {
simonis@6465:       fprintf(stderr, "libperfstat initialized.\n");
simonis@6465:     }
simonis@6465:   }
simonis@6465: } // end: os::Aix::initialize_libperfstat
simonis@6465: 
simonis@6465: /////////////////////////////////////////////////////////////////////////////
simonis@6465: // thread stack
simonis@6465: 
simonis@6465: // function to query the current stack size using pthread_getthrds_np
simonis@6465: //
simonis@6465: // ! do not change anything here unless you know what you are doing !
simonis@6465: static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size) {
simonis@6465: 
simonis@6465:   // This only works when invoked on a pthread. As we agreed not to use
simonis@6465:   // primordial threads anyway, I assert here
simonis@6465:   guarantee(!os::Aix::is_primordial_thread(), "not allowed on the primordial thread");
simonis@6465: 
simonis@6465:   // information about this api can be found (a) in the pthread.h header and
simonis@6465:   // (b) in http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_getthrds_np.htm
simonis@6465:   //
simonis@6465:   // The use of this API to find out the current stack is kind of undefined.
simonis@6465:   // But after a lot of tries and asking IBM about it, I concluded that it is safe
simonis@6465:   // enough for cases where I let the pthread library create its stacks. For cases
simonis@6465:   // where I create an own stack and pass this to pthread_create, it seems not to
simonis@6465:   // work (the returned stack size in that case is 0).
simonis@6465: 
simonis@6465:   pthread_t tid = pthread_self();
simonis@6465:   struct __pthrdsinfo pinfo;
simonis@6465:   char dummy[1]; // we only need this to satisfy the api and to not get E
simonis@6465:   int dummy_size = sizeof(dummy);
simonis@6465: 
simonis@6465:   memset(&pinfo, 0, sizeof(pinfo));
simonis@6465: 
simonis@6465:   const int rc = pthread_getthrds_np (&tid, PTHRDSINFO_QUERY_ALL, &pinfo,
simonis@6465:                                       sizeof(pinfo), dummy, &dummy_size);
simonis@6465: 
simonis@6465:   if (rc != 0) {
simonis@6465:     fprintf(stderr, "pthread_getthrds_np failed (%d)\n", rc);
simonis@6465:     guarantee(0, "pthread_getthrds_np failed");
simonis@6465:   }
simonis@6465: 
simonis@6465:   guarantee(pinfo.__pi_stackend, "returned stack base invalid");
simonis@6465: 
simonis@6465:   // the following can happen when invoking pthread_getthrds_np on a pthread running on a user provided stack
simonis@6465:   // (when handing down a stack to pthread create, see pthread_attr_setstackaddr).
simonis@6465:   // Not sure what to do here - I feel inclined to forbid this use case completely.
simonis@6465:   guarantee(pinfo.__pi_stacksize, "returned stack size invalid");
simonis@6465: 
simonis@6465:   // On AIX, stacks are not necessarily page aligned so round the base and size accordingly
simonis@6465:   if (p_stack_base) {
simonis@6465:     (*p_stack_base) = (address) align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size());
simonis@6465:   }
simonis@6465: 
simonis@6465:   if (p_stack_size) {
simonis@6465:     (*p_stack_size) = pinfo.__pi_stacksize - os::Aix::stack_page_size();
simonis@6465:   }
simonis@6465: 
simonis@6465: #ifndef PRODUCT
simonis@6465:   if (Verbose) {
simonis@6465:     fprintf(stderr,
simonis@6465:             "query_stack_dimensions() -> real stack_base=" INTPTR_FORMAT ", real stack_addr=" INTPTR_FORMAT
simonis@6465:             ", real stack_size=" INTPTR_FORMAT
simonis@6465:             ", stack_base=" INTPTR_FORMAT ", stack_size=" INTPTR_FORMAT "\n",
simonis@6465:             (intptr_t)pinfo.__pi_stackend, (intptr_t)pinfo.__pi_stackaddr, pinfo.__pi_stacksize,
simonis@6465:             (intptr_t)align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size()),
simonis@6465:             pinfo.__pi_stacksize - os::Aix::stack_page_size());
simonis@6465:   }
simonis@6465: #endif
simonis@6465: 
simonis@6465: } // end query_stack_dimensions
simonis@6465: 
simonis@6465: // get the current stack base from the OS (actually, the pthread library)
simonis@6465: address os::current_stack_base() {
simonis@6465:   address p;
simonis@6465:   query_stack_dimensions(&p, 0);
simonis@6465:   return p;
simonis@6465: }
simonis@6465: 
simonis@6465: // get the current stack size from the OS (actually, the pthread library)
simonis@6465: size_t os::current_stack_size() {
simonis@6465:   size_t s;
simonis@6465:   query_stack_dimensions(0, &s);
simonis@6465:   return s;
simonis@6465: }
simonis@6465: 
simonis@6465: // Refer to the comments in os_solaris.cpp park-unpark.
simonis@6465: //
simonis@6465: // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
simonis@6465: // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
simonis@6465: // For specifics regarding the bug see GLIBC BUGID 261237 :
simonis@6465: //    http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
simonis@6465: // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
simonis@6465: // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
simonis@6465: // is used. (The simple C test-case provided in the GLIBC bug report manifests the
simonis@6465: // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
simonis@6465: // and monitorenter when we're using 1-0 locking. All those operations may result in
simonis@6465: // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
simonis@6465: // of libpthread avoids the problem, but isn't practical.
simonis@6465: //
simonis@6465: // Possible remedies:
simonis@6465: //
simonis@6465: // 1.   Establish a minimum relative wait time. 50 to 100 msecs seems to work.
simonis@6465: //      This is palliative and probabilistic, however. If the thread is preempted
simonis@6465: //      between the call to compute_abstime() and pthread_cond_timedwait(), more
simonis@6465: //      than the minimum period may have passed, and the abstime may be stale (in the
simonis@6465: //      past) resultin in a hang. Using this technique reduces the odds of a hang
simonis@6465: //      but the JVM is still vulnerable, particularly on heavily loaded systems.
simonis@6465: //
simonis@6465: // 2.   Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
simonis@6465: //      of the usual flag-condvar-mutex idiom. The write side of the pipe is set
simonis@6465: //      NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
simonis@6465: //      reduces to poll()+read(). This works well, but consumes 2 FDs per extant
simonis@6465: //      thread.
simonis@6465: //
simonis@6465: // 3.   Embargo pthread_cond_timedwait() and implement a native "chron" thread
simonis@6465: //      that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
simonis@6465: //      a timeout request to the chron thread and then blocking via pthread_cond_wait().
simonis@6465: //      This also works well. In fact it avoids kernel-level scalability impediments
simonis@6465: //      on certain platforms that don't handle lots of active pthread_cond_timedwait()
simonis@6465: //      timers in a graceful fashion.
simonis@6465: //
simonis@6465: // 4.   When the abstime value is in the past it appears that control returns
simonis@6465: //      correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
simonis@6465: //      Subsequent timedwait/wait calls may hang indefinitely. Given that, we
simonis@6465: //      can avoid the problem by reinitializing the condvar -- by cond_destroy()
simonis@6465: //      followed by cond_init() -- after all calls to pthread_cond_timedwait().
simonis@6465: //      It may be possible to avoid reinitialization by checking the return
simonis@6465: //      value from pthread_cond_timedwait(). In addition to reinitializing the
simonis@6465: //      condvar we must establish the invariant that cond_signal() is only called
simonis@6465: //      within critical sections protected by the adjunct mutex. This prevents
simonis@6465: //      cond_signal() from "seeing" a condvar that's in the midst of being
simonis@6465: //      reinitialized or that is corrupt. Sadly, this invariant obviates the
simonis@6465: //      desirable signal-after-unlock optimization that avoids futile context switching.
simonis@6465: //
simonis@6465: //      I'm also concerned that some versions of NTPL might allocate an auxilliary
simonis@6465: //      structure when a condvar is used or initialized. cond_destroy() would
simonis@6465: //      release the helper structure. Our reinitialize-after-timedwait fix
simonis@6465: //      put excessive stress on malloc/free and locks protecting the c-heap.
simonis@6465: //
simonis@6465: // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
simonis@6465: // It may be possible to refine (4) by checking the kernel and NTPL verisons
simonis@6465: // and only enabling the work-around for vulnerable environments.
simonis@6465: 
simonis@6465: // utility to compute the abstime argument to timedwait:
simonis@6465: // millis is the relative timeout time
simonis@6465: // abstime will be the absolute timeout time
simonis@6465: // TODO: replace compute_abstime() with unpackTime()
simonis@6465: 
simonis@6465: static struct timespec* compute_abstime(timespec* abstime, jlong millis) {
simonis@6465:   if (millis < 0) millis = 0;
simonis@6465:   struct timeval now;
simonis@6465:   int status = gettimeofday(&now, NULL);
simonis@6465:   assert(status == 0, "gettimeofday");
simonis@6465:   jlong seconds = millis / 1000;
simonis@6465:   millis %= 1000;
simonis@6465:   if (seconds > 50000000) { // see man cond_timedwait(3T)
simonis@6465:     seconds = 50000000;
simonis@6465:   }
simonis@6465:   abstime->tv_sec = now.tv_sec  + seconds;
simonis@6465:   long       usec = now.tv_usec + millis * 1000;
simonis@6465:   if (usec >= 1000000) {
simonis@6465:     abstime->tv_sec += 1;
simonis@6465:     usec -= 1000000;
simonis@6465:   }
simonis@6465:   abstime->tv_nsec = usec * 1000;
simonis@6465:   return abstime;
simonis@6465: }
simonis@6465: 
simonis@6465: 
simonis@6465: // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
simonis@6465: // Conceptually TryPark() should be equivalent to park(0).
simonis@6465: 
simonis@6465: int os::PlatformEvent::TryPark() {
simonis@6465:   for (;;) {
simonis@6465:     const int v = _Event;
simonis@6465:     guarantee ((v == 0) || (v == 1), "invariant");
simonis@6465:     if (Atomic::cmpxchg (0, &_Event, v) == v) return v;
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: void os::PlatformEvent::park() {       // AKA "down()"
simonis@6465:   // Invariant: Only the thread associated with the Event/PlatformEvent
simonis@6465:   // may call park().
simonis@6465:   // TODO: assert that _Assoc != NULL or _Assoc == Self
simonis@6465:   int v;
simonis@6465:   for (;;) {
simonis@6465:     v = _Event;
simonis@6465:     if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
simonis@6465:   }
simonis@6465:   guarantee (v >= 0, "invariant");
simonis@6465:   if (v == 0) {
simonis@6465:     // Do this the hard way by blocking ...
simonis@6465:     int status = pthread_mutex_lock(_mutex);
simonis@6465:     assert_status(status == 0, status, "mutex_lock");
simonis@6465:     guarantee (_nParked == 0, "invariant");
simonis@6465:     ++ _nParked;
simonis@6465:     while (_Event < 0) {
simonis@6465:       status = pthread_cond_wait(_cond, _mutex);
simonis@6465:       assert_status(status == 0 || status == ETIMEDOUT, status, "cond_timedwait");
simonis@6465:     }
simonis@6465:     -- _nParked;
simonis@6465: 
simonis@6465:     // In theory we could move the ST of 0 into _Event past the unlock(),
simonis@6465:     // but then we'd need a MEMBAR after the ST.
simonis@6465:     _Event = 0;
simonis@6465:     status = pthread_mutex_unlock(_mutex);
simonis@6465:     assert_status(status == 0, status, "mutex_unlock");
simonis@6465:   }
simonis@6465:   guarantee (_Event >= 0, "invariant");
simonis@6465: }
simonis@6465: 
simonis@6465: int os::PlatformEvent::park(jlong millis) {
simonis@6465:   guarantee (_nParked == 0, "invariant");
simonis@6465: 
simonis@6465:   int v;
simonis@6465:   for (;;) {
simonis@6465:     v = _Event;
simonis@6465:     if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
simonis@6465:   }
simonis@6465:   guarantee (v >= 0, "invariant");
simonis@6465:   if (v != 0) return OS_OK;
simonis@6465: 
simonis@6465:   // We do this the hard way, by blocking the thread.
simonis@6465:   // Consider enforcing a minimum timeout value.
simonis@6465:   struct timespec abst;
simonis@6465:   compute_abstime(&abst, millis);
simonis@6465: 
simonis@6465:   int ret = OS_TIMEOUT;
simonis@6465:   int status = pthread_mutex_lock(_mutex);
simonis@6465:   assert_status(status == 0, status, "mutex_lock");
simonis@6465:   guarantee (_nParked == 0, "invariant");
simonis@6465:   ++_nParked;
simonis@6465: 
simonis@6465:   // Object.wait(timo) will return because of
simonis@6465:   // (a) notification
simonis@6465:   // (b) timeout
simonis@6465:   // (c) thread.interrupt
simonis@6465:   //
simonis@6465:   // Thread.interrupt and object.notify{All} both call Event::set.
simonis@6465:   // That is, we treat thread.interrupt as a special case of notification.
simonis@6465:   // The underlying Solaris implementation, cond_timedwait, admits
simonis@6465:   // spurious/premature wakeups, but the JLS/JVM spec prevents the
simonis@6465:   // JVM from making those visible to Java code. As such, we must
simonis@6465:   // filter out spurious wakeups. We assume all ETIME returns are valid.
simonis@6465:   //
simonis@6465:   // TODO: properly differentiate simultaneous notify+interrupt.
simonis@6465:   // In that case, we should propagate the notify to another waiter.
simonis@6465: 
simonis@6465:   while (_Event < 0) {
simonis@6465:     status = pthread_cond_timedwait(_cond, _mutex, &abst);
simonis@6465:     assert_status(status == 0 || status == ETIMEDOUT,
simonis@6465:           status, "cond_timedwait");
simonis@6465:     if (!FilterSpuriousWakeups) break;         // previous semantics
simonis@6465:     if (status == ETIMEDOUT) break;
simonis@6465:     // We consume and ignore EINTR and spurious wakeups.
simonis@6465:   }
simonis@6465:   --_nParked;
simonis@6465:   if (_Event >= 0) {
simonis@6465:      ret = OS_OK;
simonis@6465:   }
simonis@6465:   _Event = 0;
simonis@6465:   status = pthread_mutex_unlock(_mutex);
simonis@6465:   assert_status(status == 0, status, "mutex_unlock");
simonis@6465:   assert (_nParked == 0, "invariant");
simonis@6465:   return ret;
simonis@6465: }
simonis@6465: 
simonis@6465: void os::PlatformEvent::unpark() {
simonis@6465:   int v, AnyWaiters;
simonis@6465:   for (;;) {
simonis@6465:     v = _Event;
simonis@6465:     if (v > 0) {
simonis@6465:       // The LD of _Event could have reordered or be satisfied
simonis@6465:       // by a read-aside from this processor's write buffer.
simonis@6465:       // To avoid problems execute a barrier and then
simonis@6465:       // ratify the value.
simonis@6465:       OrderAccess::fence();
simonis@6465:       if (_Event == v) return;
simonis@6465:       continue;
simonis@6465:     }
simonis@6465:     if (Atomic::cmpxchg (v+1, &_Event, v) == v) break;
simonis@6465:   }
simonis@6465:   if (v < 0) {
simonis@6465:     // Wait for the thread associated with the event to vacate
simonis@6465:     int status = pthread_mutex_lock(_mutex);
simonis@6465:     assert_status(status == 0, status, "mutex_lock");
simonis@6465:     AnyWaiters = _nParked;
simonis@6465: 
simonis@6465:     if (AnyWaiters != 0) {
simonis@6465:       // We intentional signal *after* dropping the lock
simonis@6465:       // to avoid a common class of futile wakeups.
simonis@6465:       status = pthread_cond_signal(_cond);
simonis@6465:       assert_status(status == 0, status, "cond_signal");
simonis@6465:     }
simonis@6465:     // Mutex should be locked for pthread_cond_signal(_cond).
simonis@6465:     status = pthread_mutex_unlock(_mutex);
simonis@6465:     assert_status(status == 0, status, "mutex_unlock");
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Note that we signal() _after dropping the lock for "immortal" Events.
simonis@6465:   // This is safe and avoids a common class of futile wakeups. In rare
simonis@6465:   // circumstances this can cause a thread to return prematurely from
simonis@6465:   // cond_{timed}wait() but the spurious wakeup is benign and the victim will
simonis@6465:   // simply re-test the condition and re-park itself.
simonis@6465: }
simonis@6465: 
simonis@6465: 
simonis@6465: // JSR166
simonis@6465: // -------------------------------------------------------
simonis@6465: 
simonis@6465: //
simonis@6465: // The solaris and linux implementations of park/unpark are fairly
simonis@6465: // conservative for now, but can be improved. They currently use a
simonis@6465: // mutex/condvar pair, plus a a count.
simonis@6465: // Park decrements count if > 0, else does a condvar wait. Unpark
simonis@6465: // sets count to 1 and signals condvar. Only one thread ever waits
simonis@6465: // on the condvar. Contention seen when trying to park implies that someone
simonis@6465: // is unparking you, so don't wait. And spurious returns are fine, so there
simonis@6465: // is no need to track notifications.
simonis@6465: //
simonis@6465: 
simonis@6465: #define MAX_SECS 100000000
simonis@6465: //
simonis@6465: // This code is common to linux and solaris and will be moved to a
simonis@6465: // common place in dolphin.
simonis@6465: //
simonis@6465: // The passed in time value is either a relative time in nanoseconds
simonis@6465: // or an absolute time in milliseconds. Either way it has to be unpacked
simonis@6465: // into suitable seconds and nanoseconds components and stored in the
simonis@6465: // given timespec structure.
simonis@6465: // Given time is a 64-bit value and the time_t used in the timespec is only
simonis@6465: // a signed-32-bit value (except on 64-bit Linux) we have to watch for
simonis@6465: // overflow if times way in the future are given. Further on Solaris versions
simonis@6465: // prior to 10 there is a restriction (see cond_timedwait) that the specified
simonis@6465: // number of seconds, in abstime, is less than current_time + 100,000,000.
simonis@6465: // As it will be 28 years before "now + 100000000" will overflow we can
simonis@6465: // ignore overflow and just impose a hard-limit on seconds using the value
simonis@6465: // of "now + 100,000,000". This places a limit on the timeout of about 3.17
simonis@6465: // years from "now".
simonis@6465: //
simonis@6465: 
simonis@6465: static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
simonis@6465:   assert (time > 0, "convertTime");
simonis@6465: 
simonis@6465:   struct timeval now;
simonis@6465:   int status = gettimeofday(&now, NULL);
simonis@6465:   assert(status == 0, "gettimeofday");
simonis@6465: 
simonis@6465:   time_t max_secs = now.tv_sec + MAX_SECS;
simonis@6465: 
simonis@6465:   if (isAbsolute) {
simonis@6465:     jlong secs = time / 1000;
simonis@6465:     if (secs > max_secs) {
simonis@6465:       absTime->tv_sec = max_secs;
simonis@6465:     }
simonis@6465:     else {
simonis@6465:       absTime->tv_sec = secs;
simonis@6465:     }
simonis@6465:     absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
simonis@6465:   }
simonis@6465:   else {
simonis@6465:     jlong secs = time / NANOSECS_PER_SEC;
simonis@6465:     if (secs >= MAX_SECS) {
simonis@6465:       absTime->tv_sec = max_secs;
simonis@6465:       absTime->tv_nsec = 0;
simonis@6465:     }
simonis@6465:     else {
simonis@6465:       absTime->tv_sec = now.tv_sec + secs;
simonis@6465:       absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
simonis@6465:       if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
simonis@6465:         absTime->tv_nsec -= NANOSECS_PER_SEC;
simonis@6465:         ++absTime->tv_sec; // note: this must be <= max_secs
simonis@6465:       }
simonis@6465:     }
simonis@6465:   }
simonis@6465:   assert(absTime->tv_sec >= 0, "tv_sec < 0");
simonis@6465:   assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
simonis@6465:   assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
simonis@6465:   assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
simonis@6465: }
simonis@6465: 
simonis@6465: void Parker::park(bool isAbsolute, jlong time) {
simonis@6465:   // Optional fast-path check:
simonis@6465:   // Return immediately if a permit is available.
simonis@6465:   if (_counter > 0) {
simonis@6465:       _counter = 0;
simonis@6465:       OrderAccess::fence();
simonis@6465:       return;
simonis@6465:   }
simonis@6465: 
simonis@6465:   Thread* thread = Thread::current();
simonis@6465:   assert(thread->is_Java_thread(), "Must be JavaThread");
simonis@6465:   JavaThread *jt = (JavaThread *)thread;
simonis@6465: 
simonis@6465:   // Optional optimization -- avoid state transitions if there's an interrupt pending.
simonis@6465:   // Check interrupt before trying to wait
simonis@6465:   if (Thread::is_interrupted(thread, false)) {
simonis@6465:     return;
simonis@6465:   }
simonis@6465: 
simonis@6465:   // Next, demultiplex/decode time arguments
simonis@6465:   timespec absTime;
simonis@6465:   if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
simonis@6465:     return;
simonis@6465:   }
simonis@6465:   if (time > 0) {
simonis@6465:     unpackTime(&absTime, isAbsolute, time);
simonis@6465:   }
simonis@6465: 
simonis@6465: 
simonis@6465:   // Enter safepoint region
simonis@6465:   // Beware of deadlocks such as 6317397.
simonis@6465:   // The per-thread Parker:: mutex is a classic leaf-lock.
simonis@6465:   // In particular a thread must never block on the Threads_lock while
simonis@6465:   // holding the Parker:: mutex. If safepoints are pending both the
simonis@6465:   // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
simonis@6465:   ThreadBlockInVM tbivm(jt);
simonis@6465: 
simonis@6465:   // Don't wait if cannot get lock since interference arises from
simonis@6465:   // unblocking. Also. check interrupt before trying wait
simonis@6465:   if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
simonis@6465:     return;
simonis@6465:   }
simonis@6465: 
simonis@6465:   int status;
simonis@6465:   if (_counter > 0) { // no wait needed
simonis@6465:     _counter = 0;
simonis@6465:     status = pthread_mutex_unlock(_mutex);
simonis@6465:     assert (status == 0, "invariant");
simonis@6465:     OrderAccess::fence();
simonis@6465:     return;
simonis@6465:   }
simonis@6465: 
simonis@6465: #ifdef ASSERT
simonis@6465:   // Don't catch signals while blocked; let the running threads have the signals.
simonis@6465:   // (This allows a debugger to break into the running thread.)
simonis@6465:   sigset_t oldsigs;
simonis@6465:   sigset_t* allowdebug_blocked = os::Aix::allowdebug_blocked_signals();
simonis@6465:   pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
simonis@6465: #endif
simonis@6465: 
simonis@6465:   OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
simonis@6465:   jt->set_suspend_equivalent();
simonis@6465:   // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
simonis@6465: 
simonis@6465:   if (time == 0) {
simonis@6465:     status = pthread_cond_wait (_cond, _mutex);
simonis@6465:   } else {
simonis@6465:     status = pthread_cond_timedwait (_cond, _mutex, &absTime);
simonis@6465:     if (status != 0 && WorkAroundNPTLTimedWaitHang) {
simonis@6465:       pthread_cond_destroy (_cond);
simonis@6465:       pthread_cond_init    (_cond, NULL);
simonis@6465:     }
simonis@6465:   }
simonis@6465:   assert_status(status == 0 || status == EINTR ||
simonis@6465:                 status == ETIME || status == ETIMEDOUT,
simonis@6465:                 status, "cond_timedwait");
simonis@6465: 
simonis@6465: #ifdef ASSERT
simonis@6465:   pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
simonis@6465: #endif
simonis@6465: 
simonis@6465:   _counter = 0;
simonis@6465:   status = pthread_mutex_unlock(_mutex);
simonis@6465:   assert_status(status == 0, status, "invariant");
simonis@6465:   // If externally suspended while waiting, re-suspend
simonis@6465:   if (jt->handle_special_suspend_equivalent_condition()) {
simonis@6465:     jt->java_suspend_self();
simonis@6465:   }
simonis@6465: 
simonis@6465:   OrderAccess::fence();
simonis@6465: }
simonis@6465: 
simonis@6465: void Parker::unpark() {
simonis@6465:   int s, status;
simonis@6465:   status = pthread_mutex_lock(_mutex);
simonis@6465:   assert (status == 0, "invariant");
simonis@6465:   s = _counter;
simonis@6465:   _counter = 1;
simonis@6465:   if (s < 1) {
simonis@6465:     if (WorkAroundNPTLTimedWaitHang) {
simonis@6465:       status = pthread_cond_signal (_cond);
simonis@6465:       assert (status == 0, "invariant");
simonis@6465:       status = pthread_mutex_unlock(_mutex);
simonis@6465:       assert (status == 0, "invariant");
simonis@6465:     } else {
simonis@6465:       status = pthread_mutex_unlock(_mutex);
simonis@6465:       assert (status == 0, "invariant");
simonis@6465:       status = pthread_cond_signal (_cond);
simonis@6465:       assert (status == 0, "invariant");
simonis@6465:     }
simonis@6465:   } else {
simonis@6465:     pthread_mutex_unlock(_mutex);
simonis@6465:     assert (status == 0, "invariant");
simonis@6465:   }
simonis@6465: }
simonis@6465: 
simonis@6465: 
simonis@6465: extern char** environ;
simonis@6465: 
simonis@6465: // Run the specified command in a separate process. Return its exit value,
simonis@6465: // or -1 on failure (e.g. can't fork a new process).
simonis@6465: // Unlike system(), this function can be called from signal handler. It
simonis@6465: // doesn't block SIGINT et al.
simonis@6465: int os::fork_and_exec(char* cmd) {
simonis@6471:   char * argv[4] = {"sh", "-c", cmd, NULL};
simonis@6471: 
simonis@6471:   pid_t pid = fork();
simonis@6471: 
simonis@6471:   if (pid < 0) {
simonis@6471:     // fork failed
simonis@6471:     return -1;
simonis@6471: 
simonis@6471:   } else if (pid == 0) {
simonis@6471:     // child process
simonis@6471: 
simonis@6471:     // try to be consistent with system(), which uses "/usr/bin/sh" on AIX
simonis@6471:     execve("/usr/bin/sh", argv, environ);
simonis@6471: 
simonis@6471:     // execve failed
simonis@6471:     _exit(-1);
simonis@6471: 
simonis@6471:   } else  {
simonis@6471:     // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
simonis@6471:     // care about the actual exit code, for now.
simonis@6471: 
simonis@6471:     int status;
simonis@6471: 
simonis@6471:     // Wait for the child process to exit.  This returns immediately if
simonis@6471:     // the child has already exited. */
simonis@6471:     while (waitpid(pid, &status, 0) < 0) {
simonis@6471:         switch (errno) {
simonis@6471:         case ECHILD: return 0;
simonis@6471:         case EINTR: break;
simonis@6471:         default: return -1;
simonis@6471:         }
simonis@6471:     }
simonis@6471: 
simonis@6471:     if (WIFEXITED(status)) {
simonis@6471:        // The child exited normally; get its exit code.
simonis@6471:        return WEXITSTATUS(status);
simonis@6471:     } else if (WIFSIGNALED(status)) {
simonis@6471:        // The child exited because of a signal
simonis@6471:        // The best value to return is 0x80 + signal number,
simonis@6471:        // because that is what all Unix shells do, and because
simonis@6471:        // it allows callers to distinguish between process exit and
simonis@6471:        // process death by signal.
simonis@6471:        return 0x80 + WTERMSIG(status);
simonis@6471:     } else {
simonis@6471:        // Unknown exit code; pass it through
simonis@6471:        return status;
simonis@6471:     }
simonis@6471:   }
simonis@6471:   // Remove warning.
simonis@6471:   return -1;
simonis@6465: }
simonis@6465: 
simonis@6465: // is_headless_jre()
simonis@6465: //
simonis@6465: // Test for the existence of xawt/libmawt.so or libawt_xawt.so
simonis@6465: // in order to report if we are running in a headless jre.
simonis@6465: //
simonis@6465: // Since JDK8 xawt/libmawt.so is moved into the same directory
simonis@6465: // as libawt.so, and renamed libawt_xawt.so
simonis@6465: bool os::is_headless_jre() {
simonis@6465:   struct stat statbuf;
simonis@6465:   char buf[MAXPATHLEN];
simonis@6465:   char libmawtpath[MAXPATHLEN];
simonis@6465:   const char *xawtstr  = "/xawt/libmawt.so";
simonis@6465:   const char *new_xawtstr = "/libawt_xawt.so";
simonis@6465: 
simonis@6465:   char *p;
simonis@6465: 
simonis@6465:   // Get path to libjvm.so
simonis@6465:   os::jvm_path(buf, sizeof(buf));
simonis@6465: 
simonis@6465:   // Get rid of libjvm.so
simonis@6465:   p = strrchr(buf, '/');
simonis@6465:   if (p == NULL) return false;
simonis@6465:   else *p = '\0';
simonis@6465: 
simonis@6465:   // Get rid of client or server
simonis@6465:   p = strrchr(buf, '/');
simonis@6465:   if (p == NULL) return false;
simonis@6465:   else *p = '\0';
simonis@6465: 
simonis@6465:   // check xawt/libmawt.so
simonis@6465:   strcpy(libmawtpath, buf);
simonis@6465:   strcat(libmawtpath, xawtstr);
simonis@6465:   if (::stat(libmawtpath, &statbuf) == 0) return false;
simonis@6465: 
simonis@6465:   // check libawt_xawt.so
simonis@6465:   strcpy(libmawtpath, buf);
simonis@6465:   strcat(libmawtpath, new_xawtstr);
simonis@6465:   if (::stat(libmawtpath, &statbuf) == 0) return false;
simonis@6465: 
simonis@6465:   return true;
simonis@6465: }
simonis@6465: 
simonis@6465: // Get the default path to the core file
simonis@6465: // Returns the length of the string
simonis@6465: int os::get_core_path(char* buffer, size_t bufferSize) {
simonis@6465:   const char* p = get_current_directory(buffer, bufferSize);
simonis@6465: 
simonis@6465:   if (p == NULL) {
simonis@6465:     assert(p != NULL, "failed to get current directory");
simonis@6465:     return 0;
simonis@6465:   }
simonis@6465: 
simonis@6465:   return strlen(buffer);
simonis@6465: }
simonis@6465: 
simonis@6465: #ifndef PRODUCT
simonis@6465: void TestReserveMemorySpecial_test() {
simonis@6465:   // No tests available for this platform
simonis@6465: }
simonis@6465: #endif