never@3156: /*
dcubed@4471:  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
never@3156:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
never@3156:  *
never@3156:  * This code is free software; you can redistribute it and/or modify it
never@3156:  * under the terms of the GNU General Public License version 2 only, as
never@3156:  * published by the Free Software Foundation.
never@3156:  *
never@3156:  * This code is distributed in the hope that it will be useful, but WITHOUT
never@3156:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
never@3156:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
never@3156:  * version 2 for more details (a copy is included in the LICENSE file that
never@3156:  * accompanied this code).
never@3156:  *
never@3156:  * You should have received a copy of the GNU General Public License version
never@3156:  * 2 along with this work; if not, write to the Free Software Foundation,
never@3156:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
never@3156:  *
never@3156:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
never@3156:  * or visit www.oracle.com if you need additional information or have any
never@3156:  * questions.
never@3156:  *
never@3156:  */
never@3156: 
never@3156: // no precompiled headers
never@3156: #include "classfile/classLoader.hpp"
never@3156: #include "classfile/systemDictionary.hpp"
never@3156: #include "classfile/vmSymbols.hpp"
never@3156: #include "code/icBuffer.hpp"
never@3156: #include "code/vtableStubs.hpp"
never@3156: #include "compiler/compileBroker.hpp"
twisti@4318: #include "compiler/disassembler.hpp"
never@3156: #include "interpreter/interpreter.hpp"
never@3156: #include "jvm_bsd.h"
never@3156: #include "memory/allocation.inline.hpp"
never@3156: #include "memory/filemap.hpp"
never@3156: #include "mutex_bsd.inline.hpp"
never@3156: #include "oops/oop.inline.hpp"
never@3156: #include "os_share_bsd.hpp"
never@3156: #include "prims/jniFastGetField.hpp"
never@3156: #include "prims/jvm.h"
never@3156: #include "prims/jvm_misc.hpp"
never@3156: #include "runtime/arguments.hpp"
never@3156: #include "runtime/extendedPC.hpp"
never@3156: #include "runtime/globals.hpp"
never@3156: #include "runtime/interfaceSupport.hpp"
never@3156: #include "runtime/java.hpp"
never@3156: #include "runtime/javaCalls.hpp"
never@3156: #include "runtime/mutexLocker.hpp"
never@3156: #include "runtime/objectMonitor.hpp"
never@3156: #include "runtime/osThread.hpp"
never@3156: #include "runtime/perfMemory.hpp"
never@3156: #include "runtime/sharedRuntime.hpp"
never@3156: #include "runtime/statSampler.hpp"
never@3156: #include "runtime/stubRoutines.hpp"
stefank@4299: #include "runtime/thread.inline.hpp"
never@3156: #include "runtime/threadCritical.hpp"
never@3156: #include "runtime/timer.hpp"
never@3156: #include "services/attachListener.hpp"
zgu@4711: #include "services/memTracker.hpp"
never@3156: #include "services/runtimeService.hpp"
never@3156: #include "utilities/decoder.hpp"
never@3156: #include "utilities/defaultStream.hpp"
never@3156: #include "utilities/events.hpp"
never@3156: #include "utilities/growableArray.hpp"
never@3156: #include "utilities/vmError.hpp"
never@3156: 
never@3156: // put OS-includes here
never@3156: # include <sys/types.h>
never@3156: # include <sys/mman.h>
never@3156: # include <sys/stat.h>
never@3156: # include <sys/select.h>
never@3156: # include <pthread.h>
never@3156: # include <signal.h>
never@3156: # include <errno.h>
never@3156: # include <dlfcn.h>
never@3156: # include <stdio.h>
never@3156: # include <unistd.h>
never@3156: # include <sys/resource.h>
never@3156: # include <pthread.h>
never@3156: # include <sys/stat.h>
never@3156: # include <sys/time.h>
never@3156: # include <sys/times.h>
never@3156: # include <sys/utsname.h>
never@3156: # include <sys/socket.h>
never@3156: # include <sys/wait.h>
never@3156: # include <time.h>
never@3156: # include <pwd.h>
never@3156: # include <poll.h>
never@3156: # include <semaphore.h>
never@3156: # include <fcntl.h>
never@3156: # include <string.h>
never@3156: # include <sys/param.h>
never@3156: # include <sys/sysctl.h>
never@3156: # include <sys/ipc.h>
never@3156: # include <sys/shm.h>
never@3156: #ifndef __APPLE__
never@3156: # include <link.h>
never@3156: #endif
never@3156: # include <stdint.h>
never@3156: # include <inttypes.h>
never@3156: # include <sys/ioctl.h>
never@3156: 
never@3156: #if defined(__FreeBSD__) || defined(__NetBSD__)
never@3156: # include <elf.h>
never@3156: #endif
never@3156: 
never@3156: #ifdef __APPLE__
dcubed@3202: # include <mach/mach.h> // semaphore_* API
dcubed@3202: # include <mach-o/dyld.h>
dcubed@3202: # include <sys/proc_info.h>
dcubed@3202: # include <objc/objc-auto.h>
never@3156: #endif
never@3156: 
never@3156: #ifndef MAP_ANONYMOUS
never@3156: #define MAP_ANONYMOUS MAP_ANON
never@3156: #endif
never@3156: 
never@3156: #define MAX_PATH    (2 * K)
never@3156: 
never@3156: // for timer info max values which include all bits
never@3156: #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
never@3156: 
never@3156: #define LARGEPAGES_BIT (1 << 6)
never@3156: ////////////////////////////////////////////////////////////////////////////////
never@3156: // global variables
never@3156: julong os::Bsd::_physical_memory = 0;
never@3156: 
never@3156: 
never@3156: int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
never@3156: pthread_t os::Bsd::_main_thread;
never@3156: int os::Bsd::_page_size = -1;
never@3156: 
never@3156: static jlong initial_time_count=0;
never@3156: 
never@3156: static int clock_tics_per_sec = 100;
never@3156: 
never@3156: // For diagnostics to print a message once. see run_periodic_checks
never@3156: static sigset_t check_signal_done;
sla@4229: static bool check_signals = true;
never@3156: 
never@3156: static pid_t _initial_pid = 0;
never@3156: 
never@3156: /* Signal number used to suspend/resume a thread */
never@3156: 
never@3156: /* do not use any signal number less than SIGSEGV, see 4355769 */
never@3156: static int SR_signum = SIGUSR2;
never@3156: sigset_t SR_sigset;
never@3156: 
never@3156: 
never@3156: ////////////////////////////////////////////////////////////////////////////////
never@3156: // utility functions
never@3156: 
never@3156: static int SR_initialize();
never@3156: static int SR_finalize();
never@3156: 
never@3156: julong os::available_memory() {
never@3156:   return Bsd::available_memory();
never@3156: }
never@3156: 
never@3156: julong os::Bsd::available_memory() {
never@3156:   // XXXBSD: this is just a stopgap implementation
never@3156:   return physical_memory() >> 2;
never@3156: }
never@3156: 
never@3156: julong os::physical_memory() {
never@3156:   return Bsd::physical_memory();
never@3156: }
never@3156: 
never@3156: ////////////////////////////////////////////////////////////////////////////////
never@3156: // environment support
never@3156: 
never@3156: bool os::getenv(const char* name, char* buf, int len) {
never@3156:   const char* val = ::getenv(name);
never@3156:   if (val != NULL && strlen(val) < (size_t)len) {
never@3156:     strcpy(buf, val);
never@3156:     return true;
never@3156:   }
never@3156:   if (len > 0) buf[0] = 0;  // return a null string
never@3156:   return false;
never@3156: }
never@3156: 
never@3156: 
never@3156: // Return true if user is running as root.
never@3156: 
never@3156: bool os::have_special_privileges() {
never@3156:   static bool init = false;
never@3156:   static bool privileges = false;
never@3156:   if (!init) {
never@3156:     privileges = (getuid() != geteuid()) || (getgid() != getegid());
never@3156:     init = true;
never@3156:   }
never@3156:   return privileges;
never@3156: }
never@3156: 
never@3156: 
never@3156: 
never@3156: // Cpu architecture string
never@3156: #if   defined(ZERO)
never@3156: static char cpu_arch[] = ZERO_LIBARCH;
never@3156: #elif defined(IA64)
never@3156: static char cpu_arch[] = "ia64";
never@3156: #elif defined(IA32)
never@3156: static char cpu_arch[] = "i386";
never@3156: #elif defined(AMD64)
never@3156: static char cpu_arch[] = "amd64";
never@3156: #elif defined(ARM)
never@3156: static char cpu_arch[] = "arm";
never@3156: #elif defined(PPC)
never@3156: static char cpu_arch[] = "ppc";
never@3156: #elif defined(SPARC)
never@3156: #  ifdef _LP64
never@3156: static char cpu_arch[] = "sparcv9";
never@3156: #  else
never@3156: static char cpu_arch[] = "sparc";
never@3156: #  endif
never@3156: #else
never@3156: #error Add appropriate cpu_arch setting
never@3156: #endif
never@3156: 
phh@3473: // Compiler variant
phh@3473: #ifdef COMPILER2
phh@3473: #define COMPILER_VARIANT "server"
phh@3473: #else
phh@3473: #define COMPILER_VARIANT "client"
phh@3473: #endif
never@3156: 
sla@4229: 
never@3156: void os::Bsd::initialize_system_info() {
never@3156:   int mib[2];
never@3156:   size_t len;
never@3156:   int cpu_val;
brutisso@4468:   julong mem_val;
never@3156: 
never@3156:   /* get processors count via hw.ncpus sysctl */
never@3156:   mib[0] = CTL_HW;
never@3156:   mib[1] = HW_NCPU;
never@3156:   len = sizeof(cpu_val);
never@3156:   if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
brutisso@4468:        assert(len == sizeof(cpu_val), "unexpected data size");
never@3156:        set_processor_count(cpu_val);
never@3156:   }
never@3156:   else {
never@3156:        set_processor_count(1);   // fallback
never@3156:   }
never@3156: 
brutisso@4468:   /* get physical memory via hw.memsize sysctl (hw.memsize is used
brutisso@4468:    * since it returns a 64 bit value)
never@3156:    */
never@3156:   mib[0] = CTL_HW;
brutisso@4468:   mib[1] = HW_MEMSIZE;
never@3156:   len = sizeof(mem_val);
brutisso@4468:   if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
brutisso@4468:        assert(len == sizeof(mem_val), "unexpected data size");
never@3156:        _physical_memory = mem_val;
brutisso@4468:   } else {
never@3156:        _physical_memory = 256*1024*1024;       // fallback (XXXBSD?)
brutisso@4468:   }
never@3156: 
never@3156: #ifdef __OpenBSD__
never@3156:   {
never@3156:        // limit _physical_memory memory view on OpenBSD since
never@3156:        // datasize rlimit restricts us anyway.
never@3156:        struct rlimit limits;
never@3156:        getrlimit(RLIMIT_DATA, &limits);
never@3156:        _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
never@3156:   }
never@3156: #endif
never@3156: }
never@3156: 
dcubed@3202: #ifdef __APPLE__
dcubed@3202: static const char *get_home() {
dcubed@3202:   const char *home_dir = ::getenv("HOME");
dcubed@3202:   if ((home_dir == NULL) || (*home_dir == '\0')) {
dcubed@3202:     struct passwd *passwd_info = getpwuid(geteuid());
dcubed@3202:     if (passwd_info != NULL) {
dcubed@3202:       home_dir = passwd_info->pw_dir;
dcubed@3202:     }
dcubed@3202:   }
dcubed@3202: 
dcubed@3202:   return home_dir;
dcubed@3202: }
dcubed@3202: #endif
dcubed@3202: 
never@3156: void os::init_system_properties_values() {
never@3156: //  char arch[12];
never@3156: //  sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
never@3156: 
never@3156:   // The next steps are taken in the product version:
never@3156:   //
dcubed@4392:   // Obtain the JAVA_HOME value from the location of libjvm.so.
never@3156:   // This library should be located at:
dcubed@4392:   // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
never@3156:   //
never@3156:   // If "/jre/lib/" appears at the right place in the path, then we
dcubed@4392:   // assume libjvm.so is installed in a JDK and we use this path.
never@3156:   //
never@3156:   // Otherwise exit with message: "Could not create the Java virtual machine."
never@3156:   //
never@3156:   // The following extra steps are taken in the debugging version:
never@3156:   //
never@3156:   // If "/jre/lib/" does NOT appear at the right place in the path
never@3156:   // instead of exit check for $JAVA_HOME environment variable.
never@3156:   //
never@3156:   // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
dcubed@4392:   // then we append a fake suffix "hotspot/libjvm.so" to this path so
dcubed@4392:   // it looks like libjvm.so is installed there
dcubed@4392:   // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
never@3156:   //
never@3156:   // Otherwise exit.
never@3156:   //
never@3156:   // Important note: if the location of libjvm.so changes this
never@3156:   // code needs to be changed accordingly.
never@3156: 
never@3156:   // The next few definitions allow the code to be verbatim:
zgu@3900: #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal)
never@3156: #define getenv(n) ::getenv(n)
never@3156: 
never@3156: /*
never@3156:  * See ld(1):
never@3156:  *      The linker uses the following search paths to locate required
never@3156:  *      shared libraries:
never@3156:  *        1: ...
never@3156:  *        ...
never@3156:  *        7: The default directories, normally /lib and /usr/lib.
never@3156:  */
never@3156: #ifndef DEFAULT_LIBPATH
never@3156: #define DEFAULT_LIBPATH "/lib:/usr/lib"
never@3156: #endif
never@3156: 
never@3156: #define EXTENSIONS_DIR  "/lib/ext"
never@3156: #define ENDORSED_DIR    "/lib/endorsed"
never@3156: #define REG_DIR         "/usr/java/packages"
never@3156: 
dcubed@3202: #ifdef __APPLE__
dcubed@3202: #define SYS_EXTENSIONS_DIR   "/Library/Java/Extensions"
dcubed@3202: #define SYS_EXTENSIONS_DIRS  SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
dcubed@3202:         const char *user_home_dir = get_home();
dcubed@3202:         // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir
dcubed@3202:         int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
dcubed@3202:             sizeof(SYS_EXTENSIONS_DIRS);
dcubed@3202: #endif
dcubed@3202: 
never@3156:   {
never@3156:     /* sysclasspath, java_home, dll_dir */
never@3156:     {
never@3156:         char *home_path;
never@3156:         char *dll_path;
never@3156:         char *pslash;
never@3156:         char buf[MAXPATHLEN];
never@3156:         os::jvm_path(buf, sizeof(buf));
never@3156: 
never@3156:         // Found the full path to libjvm.so.
never@3156:         // Now cut the path to <java_home>/jre if we can.
never@3156:         *(strrchr(buf, '/')) = '\0';  /* get rid of /libjvm.so */
never@3156:         pslash = strrchr(buf, '/');
never@3156:         if (pslash != NULL)
never@3156:             *pslash = '\0';           /* get rid of /{client|server|hotspot} */
never@3156:         dll_path = malloc(strlen(buf) + 1);
never@3156:         if (dll_path == NULL)
never@3156:             return;
never@3156:         strcpy(dll_path, buf);
never@3156:         Arguments::set_dll_dir(dll_path);
never@3156: 
never@3156:         if (pslash != NULL) {
never@3156:             pslash = strrchr(buf, '/');
never@3156:             if (pslash != NULL) {
dcubed@3202:                 *pslash = '\0';       /* get rid of /<arch> (/lib on macosx) */
dcubed@3202: #ifndef __APPLE__
never@3156:                 pslash = strrchr(buf, '/');
never@3156:                 if (pslash != NULL)
never@3156:                     *pslash = '\0';   /* get rid of /lib */
dcubed@3202: #endif
never@3156:             }
never@3156:         }
never@3156: 
never@3156:         home_path = malloc(strlen(buf) + 1);
never@3156:         if (home_path == NULL)
never@3156:             return;
never@3156:         strcpy(home_path, buf);
never@3156:         Arguments::set_java_home(home_path);
never@3156: 
never@3156:         if (!set_boot_path('/', ':'))
never@3156:             return;
never@3156:     }
never@3156: 
never@3156:     /*
never@3156:      * Where to look for native libraries
never@3156:      *
never@3156:      * Note: Due to a legacy implementation, most of the library path
never@3156:      * is set in the launcher.  This was to accomodate linking restrictions
never@3156:      * on legacy Bsd implementations (which are no longer supported).
never@3156:      * Eventually, all the library path setting will be done here.
never@3156:      *
never@3156:      * However, to prevent the proliferation of improperly built native
never@3156:      * libraries, the new path component /usr/java/packages is added here.
never@3156:      * Eventually, all the library path setting will be done here.
never@3156:      */
never@3156:     {
never@3156:         char *ld_library_path;
never@3156: 
never@3156:         /*
never@3156:          * Construct the invariant part of ld_library_path. Note that the
never@3156:          * space for the colon and the trailing null are provided by the
never@3156:          * nulls included by the sizeof operator (so actually we allocate
never@3156:          * a byte more than necessary).
never@3156:          */
dcubed@3202: #ifdef __APPLE__
dcubed@3202:         ld_library_path = (char *) malloc(system_ext_size);
dcubed@3202:         sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir);
dcubed@3202: #else
never@3156:         ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") +
never@3156:             strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH));
never@3156:         sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch);
dcubed@3202: #endif
never@3156: 
never@3156:         /*
never@3156:          * Get the user setting of LD_LIBRARY_PATH, and prepended it.  It
never@3156:          * should always exist (until the legacy problem cited above is
never@3156:          * addressed).
never@3156:          */
never@3156: #ifdef __APPLE__
dcubed@3202:         // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper
dcubed@3202:         char *l = getenv("JAVA_LIBRARY_PATH");
dcubed@3202:         if (l != NULL) {
dcubed@3202:             char *t = ld_library_path;
dcubed@3202:             /* That's +1 for the colon and +1 for the trailing '\0' */
dcubed@3202:             ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1);
dcubed@3202:             sprintf(ld_library_path, "%s:%s", l, t);
dcubed@3202:             free(t);
dcubed@3202:         }
dcubed@3202: 
never@3156:         char *v = getenv("DYLD_LIBRARY_PATH");
never@3156: #else
never@3156:         char *v = getenv("LD_LIBRARY_PATH");
never@3156: #endif
never@3156:         if (v != NULL) {
never@3156:             char *t = ld_library_path;
never@3156:             /* That's +1 for the colon and +1 for the trailing '\0' */
never@3156:             ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1);
never@3156:             sprintf(ld_library_path, "%s:%s", v, t);
dcubed@3202:             free(t);
never@3156:         }
dcubed@3586: 
dcubed@3586: #ifdef __APPLE__
dcubed@3586:         // Apple's Java6 has "." at the beginning of java.library.path.
dcubed@3586:         // OpenJDK on Windows has "." at the end of java.library.path.
dcubed@3586:         // OpenJDK on Linux and Solaris don't have "." in java.library.path
dcubed@3586:         // at all. To ease the transition from Apple's Java6 to OpenJDK7,
dcubed@3586:         // "." is appended to the end of java.library.path. Yes, this
dcubed@3586:         // could cause a change in behavior, but Apple's Java6 behavior
dcubed@3586:         // can be achieved by putting "." at the beginning of the
dcubed@3586:         // JAVA_LIBRARY_PATH environment variable.
dcubed@3586:         {
dcubed@3586:             char *t = ld_library_path;
dcubed@3586:             // that's +3 for appending ":." and the trailing '\0'
dcubed@3586:             ld_library_path = (char *) malloc(strlen(t) + 3);
dcubed@3586:             sprintf(ld_library_path, "%s:%s", t, ".");
dcubed@3586:             free(t);
dcubed@3586:         }
dcubed@3586: #endif
dcubed@3586: 
never@3156:         Arguments::set_library_path(ld_library_path);
never@3156:     }
never@3156: 
never@3156:     /*
never@3156:      * Extensions directories.
never@3156:      *
never@3156:      * Note that the space for the colon and the trailing null are provided
never@3156:      * by the nulls included by the sizeof operator (so actually one byte more
never@3156:      * than necessary is allocated).
never@3156:      */
never@3156:     {
dcubed@3202: #ifdef __APPLE__
dcubed@3202:         char *buf = malloc(strlen(Arguments::get_java_home()) +
dcubed@3202:             sizeof(EXTENSIONS_DIR) + system_ext_size);
dcubed@3202:         sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":"
dcubed@3202:             SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home());
dcubed@3202: #else
never@3156:         char *buf = malloc(strlen(Arguments::get_java_home()) +
never@3156:             sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR));
never@3156:         sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR,
never@3156:             Arguments::get_java_home());
dcubed@3202: #endif
dcubed@3202: 
never@3156:         Arguments::set_ext_dirs(buf);
never@3156:     }
never@3156: 
never@3156:     /* Endorsed standards default directory. */
never@3156:     {
never@3156:         char * buf;
never@3156:         buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
never@3156:         sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
never@3156:         Arguments::set_endorsed_dirs(buf);
never@3156:     }
never@3156:   }
never@3156: 
dcubed@3202: #ifdef __APPLE__
dcubed@3202: #undef SYS_EXTENSIONS_DIR
dcubed@3202: #endif
never@3156: #undef malloc
never@3156: #undef getenv
never@3156: #undef EXTENSIONS_DIR
never@3156: #undef ENDORSED_DIR
never@3156: 
never@3156:   // Done
never@3156:   return;
never@3156: }
never@3156: 
never@3156: ////////////////////////////////////////////////////////////////////////////////
never@3156: // breakpoint support
never@3156: 
never@3156: void os::breakpoint() {
never@3156:   BREAKPOINT;
never@3156: }
never@3156: 
never@3156: extern "C" void breakpoint() {
never@3156:   // use debugger to set breakpoint here
never@3156: }
never@3156: 
never@3156: ////////////////////////////////////////////////////////////////////////////////
never@3156: // signal support
never@3156: 
never@3156: debug_only(static bool signal_sets_initialized = false);
never@3156: static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
never@3156: 
never@3156: bool os::Bsd::is_sig_ignored(int sig) {
never@3156:       struct sigaction oact;
never@3156:       sigaction(sig, (struct sigaction*)NULL, &oact);
never@3156:       void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*,  oact.sa_sigaction)
never@3156:                                      : CAST_FROM_FN_PTR(void*,  oact.sa_handler);
never@3156:       if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
never@3156:            return true;
never@3156:       else
never@3156:            return false;
never@3156: }
never@3156: 
never@3156: void os::Bsd::signal_sets_init() {
never@3156:   // Should also have an assertion stating we are still single-threaded.
never@3156:   assert(!signal_sets_initialized, "Already initialized");
never@3156:   // Fill in signals that are necessarily unblocked for all threads in
never@3156:   // the VM. Currently, we unblock the following signals:
never@3156:   // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
never@3156:   //                         by -Xrs (=ReduceSignalUsage));
never@3156:   // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
never@3156:   // other threads. The "ReduceSignalUsage" boolean tells us not to alter
never@3156:   // the dispositions or masks wrt these signals.
never@3156:   // Programs embedding the VM that want to use the above signals for their
never@3156:   // own purposes must, at this time, use the "-Xrs" option to prevent
never@3156:   // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
never@3156:   // (See bug 4345157, and other related bugs).
never@3156:   // In reality, though, unblocking these signals is really a nop, since
never@3156:   // these signals are not blocked by default.
never@3156:   sigemptyset(&unblocked_sigs);
never@3156:   sigemptyset(&allowdebug_blocked_sigs);
never@3156:   sigaddset(&unblocked_sigs, SIGILL);
never@3156:   sigaddset(&unblocked_sigs, SIGSEGV);
never@3156:   sigaddset(&unblocked_sigs, SIGBUS);
never@3156:   sigaddset(&unblocked_sigs, SIGFPE);
never@3156:   sigaddset(&unblocked_sigs, SR_signum);
never@3156: 
never@3156:   if (!ReduceSignalUsage) {
never@3156:    if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
never@3156:       sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
never@3156:       sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
never@3156:    }
never@3156:    if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
never@3156:       sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
never@3156:       sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
never@3156:    }
never@3156:    if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
never@3156:       sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
never@3156:       sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
never@3156:    }
never@3156:   }
never@3156:   // Fill in signals that are blocked by all but the VM thread.
never@3156:   sigemptyset(&vm_sigs);
never@3156:   if (!ReduceSignalUsage)
never@3156:     sigaddset(&vm_sigs, BREAK_SIGNAL);
never@3156:   debug_only(signal_sets_initialized = true);
never@3156: 
never@3156: }
never@3156: 
never@3156: // These are signals that are unblocked while a thread is running Java.
never@3156: // (For some reason, they get blocked by default.)
never@3156: sigset_t* os::Bsd::unblocked_signals() {
never@3156:   assert(signal_sets_initialized, "Not initialized");
never@3156:   return &unblocked_sigs;
never@3156: }
never@3156: 
never@3156: // These are the signals that are blocked while a (non-VM) thread is
never@3156: // running Java. Only the VM thread handles these signals.
never@3156: sigset_t* os::Bsd::vm_signals() {
never@3156:   assert(signal_sets_initialized, "Not initialized");
never@3156:   return &vm_sigs;
never@3156: }
never@3156: 
never@3156: // These are signals that are blocked during cond_wait to allow debugger in
never@3156: sigset_t* os::Bsd::allowdebug_blocked_signals() {
never@3156:   assert(signal_sets_initialized, "Not initialized");
never@3156:   return &allowdebug_blocked_sigs;
never@3156: }
never@3156: 
never@3156: void os::Bsd::hotspot_sigmask(Thread* thread) {
never@3156: 
never@3156:   //Save caller's signal mask before setting VM signal mask
never@3156:   sigset_t caller_sigmask;
never@3156:   pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
never@3156: 
never@3156:   OSThread* osthread = thread->osthread();
never@3156:   osthread->set_caller_sigmask(caller_sigmask);
never@3156: 
never@3156:   pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
never@3156: 
never@3156:   if (!ReduceSignalUsage) {
never@3156:     if (thread->is_VM_thread()) {
never@3156:       // Only the VM thread handles BREAK_SIGNAL ...
never@3156:       pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
never@3156:     } else {
never@3156:       // ... all other threads block BREAK_SIGNAL
never@3156:       pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
never@3156:     }
never@3156:   }
never@3156: }
never@3156: 
never@3156: 
never@3156: //////////////////////////////////////////////////////////////////////////////
never@3156: // create new thread
never@3156: 
never@3156: static address highest_vm_reserved_address();
never@3156: 
never@3156: // check if it's safe to start a new thread
never@3156: static bool _thread_safety_check(Thread* thread) {
sla@4229:   return true;
never@3156: }
never@3156: 
dcubed@3202: #ifdef __APPLE__
dcubed@3202: // library handle for calling objc_registerThreadWithCollector()
dcubed@3202: // without static linking to the libobjc library
dcubed@3202: #define OBJC_LIB "/usr/lib/libobjc.dylib"
dcubed@3202: #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
dcubed@3202: typedef void (*objc_registerThreadWithCollector_t)();
dcubed@3202: extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
dcubed@3202: objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
dcubed@3202: #endif
dcubed@3202: 
sla@4564: #ifdef __APPLE__
sla@4564: static uint64_t locate_unique_thread_id() {
sla@4564:   // Additional thread_id used to correlate threads in SA
sla@4564:   thread_identifier_info_data_t     m_ident_info;
sla@4564:   mach_msg_type_number_t            count = THREAD_IDENTIFIER_INFO_COUNT;
sla@4564: 
sla@4564:   thread_info(::mach_thread_self(), THREAD_IDENTIFIER_INFO,
sla@4564:               (thread_info_t) &m_ident_info, &count);
sla@4564:   return m_ident_info.thread_id;
sla@4564: }
sla@4564: #endif
sla@4564: 
never@3156: // Thread start routine for all newly created threads
never@3156: static void *java_start(Thread *thread) {
never@3156:   // Try to randomize the cache line index of hot stack frames.
never@3156:   // This helps when threads of the same stack traces evict each other's
never@3156:   // cache lines. The threads can be either from the same JVM instance, or
never@3156:   // from different JVM instances. The benefit is especially true for
never@3156:   // processors with hyperthreading technology.
never@3156:   static int counter = 0;
never@3156:   int pid = os::current_process_id();
never@3156:   alloca(((pid ^ counter++) & 7) * 128);
never@3156: 
never@3156:   ThreadLocalStorage::set_thread(thread);
never@3156: 
never@3156:   OSThread* osthread = thread->osthread();
never@3156:   Monitor* sync = osthread->startThread_lock();
never@3156: 
never@3156:   // non floating stack BsdThreads needs extra check, see above
never@3156:   if (!_thread_safety_check(thread)) {
never@3156:     // notify parent thread
never@3156:     MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
never@3156:     osthread->set_state(ZOMBIE);
never@3156:     sync->notify_all();
never@3156:     return NULL;
never@3156:   }
never@3156: 
sla@3587: #ifdef __APPLE__
sla@3587:   // thread_id is mach thread on macos
sla@3587:   osthread->set_thread_id(::mach_thread_self());
sla@4564:   osthread->set_unique_thread_id(locate_unique_thread_id());
sla@3587: #else
never@3156:   // thread_id is pthread_id on BSD
never@3156:   osthread->set_thread_id(::pthread_self());
sla@3587: #endif
never@3156:   // initialize signal mask for this thread
never@3156:   os::Bsd::hotspot_sigmask(thread);
never@3156: 
never@3156:   // initialize floating point control register
never@3156:   os::Bsd::init_thread_fpu_state();
never@3156: 
dcubed@3202: #ifdef __APPLE__
dcubed@3202:   // register thread with objc gc
dcubed@3202:   if (objc_registerThreadWithCollectorFunction != NULL) {
dcubed@3202:     objc_registerThreadWithCollectorFunction();
dcubed@3202:   }
dcubed@3202: #endif
dcubed@3202: 
never@3156:   // handshaking with parent thread
never@3156:   {
never@3156:     MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
never@3156: 
never@3156:     // notify parent thread
never@3156:     osthread->set_state(INITIALIZED);
never@3156:     sync->notify_all();
never@3156: 
never@3156:     // wait until os::start_thread()
never@3156:     while (osthread->get_state() == INITIALIZED) {
never@3156:       sync->wait(Mutex::_no_safepoint_check_flag);
never@3156:     }
never@3156:   }
never@3156: 
never@3156:   // call one more level start routine
never@3156:   thread->run();
never@3156: 
never@3156:   return 0;
never@3156: }
never@3156: 
never@3156: bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
never@3156:   assert(thread->osthread() == NULL, "caller responsible");
never@3156: 
never@3156:   // Allocate the OSThread object
never@3156:   OSThread* osthread = new OSThread(NULL, NULL);
never@3156:   if (osthread == NULL) {
never@3156:     return false;
never@3156:   }
never@3156: 
never@3156:   // set the correct thread state
never@3156:   osthread->set_thread_type(thr_type);
never@3156: 
never@3156:   // Initial state is ALLOCATED but not INITIALIZED
never@3156:   osthread->set_state(ALLOCATED);
never@3156: 
never@3156:   thread->set_osthread(osthread);
never@3156: 
never@3156:   // init thread attributes
never@3156:   pthread_attr_t attr;
never@3156:   pthread_attr_init(&attr);
never@3156:   pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
never@3156: 
never@3156:   // stack size
never@3156:   if (os::Bsd::supports_variable_stack_size()) {
never@3156:     // calculate stack size if it's not specified by caller
never@3156:     if (stack_size == 0) {
never@3156:       stack_size = os::Bsd::default_stack_size(thr_type);
never@3156: 
never@3156:       switch (thr_type) {
never@3156:       case os::java_thread:
never@3156:         // Java threads use ThreadStackSize which default value can be
never@3156:         // changed with the flag -Xss
never@3156:         assert (JavaThread::stack_size_at_create() > 0, "this should be set");
never@3156:         stack_size = JavaThread::stack_size_at_create();
never@3156:         break;
never@3156:       case os::compiler_thread:
never@3156:         if (CompilerThreadStackSize > 0) {
never@3156:           stack_size = (size_t)(CompilerThreadStackSize * K);
never@3156:           break;
never@3156:         } // else fall through:
never@3156:           // use VMThreadStackSize if CompilerThreadStackSize is not defined
never@3156:       case os::vm_thread:
never@3156:       case os::pgc_thread:
never@3156:       case os::cgc_thread:
never@3156:       case os::watcher_thread:
never@3156:         if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
never@3156:         break;
never@3156:       }
never@3156:     }
never@3156: 
never@3156:     stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed);
never@3156:     pthread_attr_setstacksize(&attr, stack_size);
never@3156:   } else {
never@3156:     // let pthread_create() pick the default value.
never@3156:   }
never@3156: 
never@3156:   ThreadState state;
never@3156: 
never@3156:   {
never@3156:     pthread_t tid;
never@3156:     int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
never@3156: 
never@3156:     pthread_attr_destroy(&attr);
never@3156: 
never@3156:     if (ret != 0) {
never@3156:       if (PrintMiscellaneous && (Verbose || WizardMode)) {
never@3156:         perror("pthread_create()");
never@3156:       }
never@3156:       // Need to clean up stuff we've allocated so far
never@3156:       thread->set_osthread(NULL);
never@3156:       delete osthread;
never@3156:       return false;
never@3156:     }
never@3156: 
never@3156:     // Store pthread info into the OSThread
never@3156:     osthread->set_pthread_id(tid);
never@3156: 
never@3156:     // Wait until child thread is either initialized or aborted
never@3156:     {
never@3156:       Monitor* sync_with_child = osthread->startThread_lock();
never@3156:       MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
never@3156:       while ((state = osthread->get_state()) == ALLOCATED) {
never@3156:         sync_with_child->wait(Mutex::_no_safepoint_check_flag);
never@3156:       }
never@3156:     }
never@3156: 
never@3156:   }
never@3156: 
never@3156:   // Aborted due to thread limit being reached
never@3156:   if (state == ZOMBIE) {
never@3156:       thread->set_osthread(NULL);
never@3156:       delete osthread;
never@3156:       return false;
never@3156:   }
never@3156: 
never@3156:   // The thread is returned suspended (in state INITIALIZED),
never@3156:   // and is started higher up in the call chain
never@3156:   assert(state == INITIALIZED, "race condition");
never@3156:   return true;
never@3156: }
never@3156: 
never@3156: /////////////////////////////////////////////////////////////////////////////
never@3156: // attach existing thread
never@3156: 
never@3156: // bootstrap the main thread
never@3156: bool os::create_main_thread(JavaThread* thread) {
never@3156:   assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
never@3156:   return create_attached_thread(thread);
never@3156: }
never@3156: 
never@3156: bool os::create_attached_thread(JavaThread* thread) {
never@3156: #ifdef ASSERT
never@3156:     thread->verify_not_published();
never@3156: #endif
never@3156: 
never@3156:   // Allocate the OSThread object
never@3156:   OSThread* osthread = new OSThread(NULL, NULL);
never@3156: 
never@3156:   if (osthread == NULL) {
never@3156:     return false;
never@3156:   }
never@3156: 
never@3156:   // Store pthread info into the OSThread
sla@3587: #ifdef __APPLE__
sla@3587:   osthread->set_thread_id(::mach_thread_self());
sla@4564:   osthread->set_unique_thread_id(locate_unique_thread_id());
sla@3587: #else
never@3156:   osthread->set_thread_id(::pthread_self());
sla@3587: #endif
never@3156:   osthread->set_pthread_id(::pthread_self());
never@3156: 
never@3156:   // initialize floating point control register
never@3156:   os::Bsd::init_thread_fpu_state();
never@3156: 
never@3156:   // Initial thread state is RUNNABLE
never@3156:   osthread->set_state(RUNNABLE);
never@3156: 
never@3156:   thread->set_osthread(osthread);
never@3156: 
never@3156:   // initialize signal mask for this thread
never@3156:   // and save the caller's signal mask
never@3156:   os::Bsd::hotspot_sigmask(thread);
never@3156: 
never@3156:   return true;
never@3156: }
never@3156: 
never@3156: void os::pd_start_thread(Thread* thread) {
never@3156:   OSThread * osthread = thread->osthread();
never@3156:   assert(osthread->get_state() != INITIALIZED, "just checking");
never@3156:   Monitor* sync_with_child = osthread->startThread_lock();
never@3156:   MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
never@3156:   sync_with_child->notify();
never@3156: }
never@3156: 
never@3156: // Free Bsd resources related to the OSThread
never@3156: void os::free_thread(OSThread* osthread) {
never@3156:   assert(osthread != NULL, "osthread not set");
never@3156: 
never@3156:   if (Thread::current()->osthread() == osthread) {
never@3156:     // Restore caller's signal mask
never@3156:     sigset_t sigmask = osthread->caller_sigmask();
never@3156:     pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
never@3156:    }
never@3156: 
never@3156:   delete osthread;
never@3156: }
never@3156: 
never@3156: //////////////////////////////////////////////////////////////////////////////
never@3156: // thread local storage
never@3156: 
never@3156: int os::allocate_thread_local_storage() {
never@3156:   pthread_key_t key;
never@3156:   int rslt = pthread_key_create(&key, NULL);
never@3156:   assert(rslt == 0, "cannot allocate thread local storage");
never@3156:   return (int)key;
never@3156: }
never@3156: 
never@3156: // Note: This is currently not used by VM, as we don't destroy TLS key
never@3156: // on VM exit.
never@3156: void os::free_thread_local_storage(int index) {
never@3156:   int rslt = pthread_key_delete((pthread_key_t)index);
never@3156:   assert(rslt == 0, "invalid index");
never@3156: }
never@3156: 
never@3156: void os::thread_local_storage_at_put(int index, void* value) {
never@3156:   int rslt = pthread_setspecific((pthread_key_t)index, value);
never@3156:   assert(rslt == 0, "pthread_setspecific failed");
never@3156: }
never@3156: 
never@3156: extern "C" Thread* get_thread() {
never@3156:   return ThreadLocalStorage::thread();
never@3156: }
never@3156: 
never@3156: 
never@3156: ////////////////////////////////////////////////////////////////////////////////
never@3156: // time support
never@3156: 
never@3156: // Time since start-up in seconds to a fine granularity.
never@3156: // Used by VMSelfDestructTimer and the MemProfiler.
never@3156: double os::elapsedTime() {
never@3156: 
never@3156:   return (double)(os::elapsed_counter()) * 0.000001;
never@3156: }
never@3156: 
never@3156: jlong os::elapsed_counter() {
never@3156:   timeval time;
never@3156:   int status = gettimeofday(&time, NULL);
never@3156:   return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
never@3156: }
never@3156: 
never@3156: jlong os::elapsed_frequency() {
never@3156:   return (1000 * 1000);
never@3156: }
never@3156: 
never@3156: // XXX: For now, code this as if BSD does not support vtime.
never@3156: bool os::supports_vtime() { return false; }
never@3156: bool os::enable_vtime()   { return false; }
never@3156: bool os::vtime_enabled()  { return false; }
never@3156: double os::elapsedVTime() {
never@3156:   // better than nothing, but not much
never@3156:   return elapsedTime();
never@3156: }
never@3156: 
never@3156: jlong os::javaTimeMillis() {
never@3156:   timeval time;
never@3156:   int status = gettimeofday(&time, NULL);
never@3156:   assert(status != -1, "bsd error");
never@3156:   return jlong(time.tv_sec) * 1000  +  jlong(time.tv_usec / 1000);
never@3156: }
never@3156: 
never@3156: #ifndef CLOCK_MONOTONIC
never@3156: #define CLOCK_MONOTONIC (1)
never@3156: #endif
never@3156: 
never@3156: #ifdef __APPLE__
never@3156: void os::Bsd::clock_init() {
never@3156:         // XXXDARWIN: Investigate replacement monotonic clock
never@3156: }
sla@4229: #else
never@3156: void os::Bsd::clock_init() {
never@3156:   struct timespec res;
never@3156:   struct timespec tp;
never@3156:   if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
never@3156:       ::clock_gettime(CLOCK_MONOTONIC, &tp)  == 0) {
never@3156:     // yes, monotonic clock is supported
never@3156:     _clock_gettime = ::clock_gettime;
never@3156:   }
never@3156: }
never@3156: #endif
never@3156: 
never@3156: 
never@3156: jlong os::javaTimeNanos() {
never@3156:   if (Bsd::supports_monotonic_clock()) {
never@3156:     struct timespec tp;
never@3156:     int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp);
never@3156:     assert(status == 0, "gettime error");
never@3156:     jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
never@3156:     return result;
never@3156:   } else {
never@3156:     timeval time;
never@3156:     int status = gettimeofday(&time, NULL);
never@3156:     assert(status != -1, "bsd error");
never@3156:     jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
never@3156:     return 1000 * usecs;
never@3156:   }
never@3156: }
never@3156: 
never@3156: void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
never@3156:   if (Bsd::supports_monotonic_clock()) {
never@3156:     info_ptr->max_value = ALL_64_BITS;
never@3156: 
never@3156:     // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
never@3156:     info_ptr->may_skip_backward = false;      // not subject to resetting or drifting
never@3156:     info_ptr->may_skip_forward = false;       // not subject to resetting or drifting
never@3156:   } else {
never@3156:     // gettimeofday - based on time in seconds since the Epoch thus does not wrap
never@3156:     info_ptr->max_value = ALL_64_BITS;
never@3156: 
never@3156:     // gettimeofday is a real time clock so it skips
never@3156:     info_ptr->may_skip_backward = true;
never@3156:     info_ptr->may_skip_forward = true;
never@3156:   }
never@3156: 
never@3156:   info_ptr->kind = JVMTI_TIMER_ELAPSED;                // elapsed not CPU time
never@3156: }
never@3156: 
never@3156: // Return the real, user, and system times in seconds from an
never@3156: // arbitrary fixed point in the past.
never@3156: bool os::getTimesSecs(double* process_real_time,
never@3156:                       double* process_user_time,
never@3156:                       double* process_system_time) {
never@3156:   struct tms ticks;
never@3156:   clock_t real_ticks = times(&ticks);
never@3156: 
never@3156:   if (real_ticks == (clock_t) (-1)) {
never@3156:     return false;
never@3156:   } else {
never@3156:     double ticks_per_second = (double) clock_tics_per_sec;
never@3156:     *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
never@3156:     *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
never@3156:     *process_real_time = ((double) real_ticks) / ticks_per_second;
never@3156: 
never@3156:     return true;
never@3156:   }
never@3156: }
never@3156: 
never@3156: 
never@3156: char * os::local_time_string(char *buf, size_t buflen) {
never@3156:   struct tm t;
never@3156:   time_t long_time;
never@3156:   time(&long_time);
never@3156:   localtime_r(&long_time, &t);
never@3156:   jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
never@3156:                t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
never@3156:                t.tm_hour, t.tm_min, t.tm_sec);
never@3156:   return buf;
never@3156: }
never@3156: 
never@3156: struct tm* os::localtime_pd(const time_t* clock, struct tm*  res) {
never@3156:   return localtime_r(clock, res);
never@3156: }
never@3156: 
never@3156: ////////////////////////////////////////////////////////////////////////////////
never@3156: // runtime exit support
never@3156: 
never@3156: // Note: os::shutdown() might be called very early during initialization, or
never@3156: // called from signal handler. Before adding something to os::shutdown(), make
never@3156: // sure it is async-safe and can handle partially initialized VM.
never@3156: void os::shutdown() {
never@3156: 
never@3156:   // allow PerfMemory to attempt cleanup of any persistent resources
never@3156:   perfMemory_exit();
never@3156: 
never@3156:   // needs to remove object in file system
never@3156:   AttachListener::abort();
never@3156: 
never@3156:   // flush buffered output, finish log files
never@3156:   ostream_abort();
never@3156: 
never@3156:   // Check for abort hook
never@3156:   abort_hook_t abort_hook = Arguments::abort_hook();
never@3156:   if (abort_hook != NULL) {
never@3156:     abort_hook();
never@3156:   }
never@3156: 
never@3156: }
never@3156: 
never@3156: // Note: os::abort() might be called very early during initialization, or
never@3156: // called from signal handler. Before adding something to os::abort(), make
never@3156: // sure it is async-safe and can handle partially initialized VM.
never@3156: void os::abort(bool dump_core) {
never@3156:   os::shutdown();
never@3156:   if (dump_core) {
never@3156: #ifndef PRODUCT
never@3156:     fdStream out(defaultStream::output_fd());
never@3156:     out.print_raw("Current thread is ");
never@3156:     char buf[16];
never@3156:     jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
never@3156:     out.print_raw_cr(buf);
never@3156:     out.print_raw_cr("Dumping core ...");
never@3156: #endif
never@3156:     ::abort(); // dump core
never@3156:   }
never@3156: 
never@3156:   ::exit(1);
never@3156: }
never@3156: 
never@3156: // Die immediately, no exit hook, no abort hook, no cleanup.
never@3156: void os::die() {
never@3156:   // _exit() on BsdThreads only kills current thread
never@3156:   ::abort();
never@3156: }
never@3156: 
never@3156: // unused on bsd for now.
never@3156: void os::set_error_file(const char *logfile) {}
never@3156: 
never@3156: 
never@3156: // This method is a copy of JDK's sysGetLastErrorString
never@3156: // from src/solaris/hpi/src/system_md.c
never@3156: 
never@3156: size_t os::lasterror(char *buf, size_t len) {
never@3156: 
never@3156:   if (errno == 0)  return 0;
never@3156: 
never@3156:   const char *s = ::strerror(errno);
never@3156:   size_t n = ::strlen(s);
never@3156:   if (n >= len) {
never@3156:     n = len - 1;
never@3156:   }
never@3156:   ::strncpy(buf, s, n);
never@3156:   buf[n] = '\0';
never@3156:   return n;
never@3156: }
never@3156: 
sla@3587: intx os::current_thread_id() {
sla@3587: #ifdef __APPLE__
sla@3587:   return (intx)::mach_thread_self();
sla@3587: #else
sla@3587:   return (intx)::pthread_self();
sla@3587: #endif
sla@3587: }
never@3156: int os::current_process_id() {
never@3156: 
never@3156:   // Under the old bsd thread library, bsd gives each thread
never@3156:   // its own process id. Because of this each thread will return
never@3156:   // a different pid if this method were to return the result
never@3156:   // of getpid(2). Bsd provides no api that returns the pid
never@3156:   // of the launcher thread for the vm. This implementation
never@3156:   // returns a unique pid, the pid of the launcher thread
never@3156:   // that starts the vm 'process'.
never@3156: 
never@3156:   // Under the NPTL, getpid() returns the same pid as the
never@3156:   // launcher thread rather than a unique pid per thread.
never@3156:   // Use gettid() if you want the old pre NPTL behaviour.
never@3156: 
never@3156:   // if you are looking for the result of a call to getpid() that
never@3156:   // returns a unique pid for the calling thread, then look at the
never@3156:   // OSThread::thread_id() method in osThread_bsd.hpp file
never@3156: 
never@3156:   return (int)(_initial_pid ? _initial_pid : getpid());
never@3156: }
never@3156: 
never@3156: // DLL functions
never@3156: 
never@3156: #define JNI_LIB_PREFIX "lib"
never@3156: #ifdef __APPLE__
never@3156: #define JNI_LIB_SUFFIX ".dylib"
never@3156: #else
never@3156: #define JNI_LIB_SUFFIX ".so"
never@3156: #endif
never@3156: 
never@3156: const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
never@3156: 
never@3156: // This must be hard coded because it's the system's temporary
never@3156: // directory not the java application's temp directory, ala java.io.tmpdir.
dcubed@3202: #ifdef __APPLE__
dcubed@3202: // macosx has a secure per-user temporary directory
dcubed@3202: char temp_path_storage[PATH_MAX];
dcubed@3202: const char* os::get_temp_directory() {
dcubed@3202:   static char *temp_path = NULL;
dcubed@3202:   if (temp_path == NULL) {
dcubed@3202:     int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
dcubed@3202:     if (pathSize == 0 || pathSize > PATH_MAX) {
dcubed@3202:       strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
dcubed@3202:     }
dcubed@3202:     temp_path = temp_path_storage;
dcubed@3202:   }
dcubed@3202:   return temp_path;
dcubed@3202: }
dcubed@3202: #else /* __APPLE__ */
never@3156: const char* os::get_temp_directory() { return "/tmp"; }
dcubed@3202: #endif /* __APPLE__ */
never@3156: 
never@3156: static bool file_exists(const char* filename) {
never@3156:   struct stat statbuf;
never@3156:   if (filename == NULL || strlen(filename) == 0) {
never@3156:     return false;
never@3156:   }
never@3156:   return os::stat(filename, &statbuf) == 0;
never@3156: }
never@3156: 
bpittore@4261: bool os::dll_build_name(char* buffer, size_t buflen,
never@3156:                         const char* pname, const char* fname) {
bpittore@4261:   bool retval = false;
never@3156:   // Copied from libhpi
never@3156:   const size_t pnamelen = pname ? strlen(pname) : 0;
never@3156: 
bpittore@4261:   // Return error on buffer overflow.
never@3156:   if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) {
bpittore@4261:     return retval;
never@3156:   }
never@3156: 
never@3156:   if (pnamelen == 0) {
never@3156:     snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname);
bpittore@4261:     retval = true;
never@3156:   } else if (strchr(pname, *os::path_separator()) != NULL) {
never@3156:     int n;
never@3156:     char** pelements = split_path(pname, &n);
never@3156:     for (int i = 0 ; i < n ; i++) {
never@3156:       // Really shouldn't be NULL, but check can't hurt
never@3156:       if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
never@3156:         continue; // skip the empty path values
never@3156:       }
never@3156:       snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX,
never@3156:           pelements[i], fname);
never@3156:       if (file_exists(buffer)) {
bpittore@4261:         retval = true;
never@3156:         break;
never@3156:       }
never@3156:     }
never@3156:     // release the storage
never@3156:     for (int i = 0 ; i < n ; i++) {
never@3156:       if (pelements[i] != NULL) {
zgu@3900:         FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
never@3156:       }
never@3156:     }
never@3156:     if (pelements != NULL) {
zgu@3900:       FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
never@3156:     }
never@3156:   } else {
never@3156:     snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname);
bpittore@4261:     retval = true;
never@3156:   }
bpittore@4261:   return retval;
never@3156: }
never@3156: 
never@3156: const char* os::get_current_directory(char *buf, int buflen) {
never@3156:   return getcwd(buf, buflen);
never@3156: }
never@3156: 
dcubed@4392: // check if addr is inside libjvm.so
never@3156: bool os::address_is_in_vm(address addr) {
never@3156:   static address libjvm_base_addr;
never@3156:   Dl_info dlinfo;
never@3156: 
never@3156:   if (libjvm_base_addr == NULL) {
never@3156:     dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo);
never@3156:     libjvm_base_addr = (address)dlinfo.dli_fbase;
never@3156:     assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
never@3156:   }
never@3156: 
never@3156:   if (dladdr((void *)addr, &dlinfo)) {
never@3156:     if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
never@3156:   }
never@3156: 
never@3156:   return false;
never@3156: }
never@3156: 
zgu@3961: 
zgu@3961: #define MACH_MAXSYMLEN 256
zgu@3961: 
never@3156: bool os::dll_address_to_function_name(address addr, char *buf,
never@3156:                                       int buflen, int *offset) {
never@3156:   Dl_info dlinfo;
zgu@3961:   char localbuf[MACH_MAXSYMLEN];
zgu@3961: 
zgu@3961:   // dladdr will find names of dynamic functions only, but does
zgu@3961:   // it set dli_fbase with mach_header address when it "fails" ?
never@3156:   if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) {
never@3156:     if (buf != NULL) {
never@3156:       if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
never@3156:         jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
never@3156:       }
never@3156:     }
never@3156:     if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
never@3156:     return true;
never@3156:   } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) {
never@3156:     if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
zgu@3432:        buf, buflen, offset, dlinfo.dli_fname)) {
never@3156:        return true;
never@3156:     }
never@3156:   }
never@3156: 
zgu@3961:   // Handle non-dymanic manually:
zgu@3961:   if (dlinfo.dli_fbase != NULL &&
zgu@3961:       Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) {
zgu@3961:     if(!Decoder::demangle(localbuf, buf, buflen)) {
zgu@3961:       jio_snprintf(buf, buflen, "%s", localbuf);
zgu@3961:     }
zgu@3961:     return true;
zgu@3961:   }
never@3156:   if (buf != NULL) buf[0] = '\0';
never@3156:   if (offset != NULL) *offset = -1;
never@3156:   return false;
never@3156: }
never@3156: 
never@3156: // ported from solaris version
never@3156: bool os::dll_address_to_library_name(address addr, char* buf,
never@3156:                                      int buflen, int* offset) {
never@3156:   Dl_info dlinfo;
never@3156: 
never@3156:   if (dladdr((void*)addr, &dlinfo)){
never@3156:      if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
never@3156:      if (offset) *offset = addr - (address)dlinfo.dli_fbase;
never@3156:      return true;
never@3156:   } else {
never@3156:      if (buf) buf[0] = '\0';
never@3156:      if (offset) *offset = -1;
never@3156:      return false;
never@3156:   }
never@3156: }
sla@4229: 
sla@4229: // Loads .dll/.so and
sla@4229: // in case of error it checks if .dll/.so was built for the
sla@4229: // same architecture as Hotspot is running on
never@3156: 
never@3156: #ifdef __APPLE__
never@3156: void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
never@3156:   void * result= ::dlopen(filename, RTLD_LAZY);
never@3156:   if (result != NULL) {
never@3156:     // Successful loading
never@3156:     return result;
never@3156:   }
never@3156: 
never@3156:   // Read system error message into ebuf
never@3156:   ::strncpy(ebuf, ::dlerror(), ebuflen-1);
never@3156:   ebuf[ebuflen-1]='\0';
never@3156: 
never@3156:   return NULL;
never@3156: }
never@3156: #else
never@3156: void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
never@3156: {
never@3156:   void * result= ::dlopen(filename, RTLD_LAZY);
never@3156:   if (result != NULL) {
never@3156:     // Successful loading
never@3156:     return result;
never@3156:   }
never@3156: 
never@3156:   Elf32_Ehdr elf_head;
never@3156: 
never@3156:   // Read system error message into ebuf
never@3156:   // It may or may not be overwritten below
never@3156:   ::strncpy(ebuf, ::dlerror(), ebuflen-1);
never@3156:   ebuf[ebuflen-1]='\0';
never@3156:   int diag_msg_max_length=ebuflen-strlen(ebuf);
never@3156:   char* diag_msg_buf=ebuf+strlen(ebuf);
never@3156: 
never@3156:   if (diag_msg_max_length==0) {
never@3156:     // No more space in ebuf for additional diagnostics message
never@3156:     return NULL;
never@3156:   }
never@3156: 
never@3156: 
never@3156:   int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
never@3156: 
never@3156:   if (file_descriptor < 0) {
never@3156:     // Can't open library, report dlerror() message
never@3156:     return NULL;
never@3156:   }
never@3156: 
never@3156:   bool failed_to_read_elf_head=
never@3156:     (sizeof(elf_head)!=
never@3156:         (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
never@3156: 
never@3156:   ::close(file_descriptor);
never@3156:   if (failed_to_read_elf_head) {
never@3156:     // file i/o error - report dlerror() msg
never@3156:     return NULL;
never@3156:   }
never@3156: 
never@3156:   typedef struct {
never@3156:     Elf32_Half  code;         // Actual value as defined in elf.h
never@3156:     Elf32_Half  compat_class; // Compatibility of archs at VM's sense
never@3156:     char        elf_class;    // 32 or 64 bit
never@3156:     char        endianess;    // MSB or LSB
never@3156:     char*       name;         // String representation
never@3156:   } arch_t;
never@3156: 
never@3156:   #ifndef EM_486
never@3156:   #define EM_486          6               /* Intel 80486 */
never@3156:   #endif
never@3156: 
never@3156:   #ifndef EM_MIPS_RS3_LE
never@3156:   #define EM_MIPS_RS3_LE  10              /* MIPS */
never@3156:   #endif
never@3156: 
never@3156:   #ifndef EM_PPC64
never@3156:   #define EM_PPC64        21              /* PowerPC64 */
never@3156:   #endif
never@3156: 
never@3156:   #ifndef EM_S390
never@3156:   #define EM_S390         22              /* IBM System/390 */
never@3156:   #endif
never@3156: 
never@3156:   #ifndef EM_IA_64
never@3156:   #define EM_IA_64        50              /* HP/Intel IA-64 */
never@3156:   #endif
never@3156: 
never@3156:   #ifndef EM_X86_64
never@3156:   #define EM_X86_64       62              /* AMD x86-64 */
never@3156:   #endif
never@3156: 
never@3156:   static const arch_t arch_array[]={
never@3156:     {EM_386,         EM_386,     ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
never@3156:     {EM_486,         EM_386,     ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
never@3156:     {EM_IA_64,       EM_IA_64,   ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
never@3156:     {EM_X86_64,      EM_X86_64,  ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
never@3156:     {EM_SPARC,       EM_SPARC,   ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
never@3156:     {EM_SPARC32PLUS, EM_SPARC,   ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
never@3156:     {EM_SPARCV9,     EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
never@3156:     {EM_PPC,         EM_PPC,     ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
never@3156:     {EM_PPC64,       EM_PPC64,   ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
never@3156:     {EM_ARM,         EM_ARM,     ELFCLASS32,   ELFDATA2LSB, (char*)"ARM"},
never@3156:     {EM_S390,        EM_S390,    ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
never@3156:     {EM_ALPHA,       EM_ALPHA,   ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
never@3156:     {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
never@3156:     {EM_MIPS,        EM_MIPS,    ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
never@3156:     {EM_PARISC,      EM_PARISC,  ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
never@3156:     {EM_68K,         EM_68K,     ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
never@3156:   };
never@3156: 
never@3156:   #if  (defined IA32)
never@3156:     static  Elf32_Half running_arch_code=EM_386;
never@3156:   #elif   (defined AMD64)
never@3156:     static  Elf32_Half running_arch_code=EM_X86_64;
never@3156:   #elif  (defined IA64)
never@3156:     static  Elf32_Half running_arch_code=EM_IA_64;
never@3156:   #elif  (defined __sparc) && (defined _LP64)
never@3156:     static  Elf32_Half running_arch_code=EM_SPARCV9;
never@3156:   #elif  (defined __sparc) && (!defined _LP64)
never@3156:     static  Elf32_Half running_arch_code=EM_SPARC;
never@3156:   #elif  (defined __powerpc64__)
never@3156:     static  Elf32_Half running_arch_code=EM_PPC64;
never@3156:   #elif  (defined __powerpc__)
never@3156:     static  Elf32_Half running_arch_code=EM_PPC;
never@3156:   #elif  (defined ARM)
never@3156:     static  Elf32_Half running_arch_code=EM_ARM;
never@3156:   #elif  (defined S390)
never@3156:     static  Elf32_Half running_arch_code=EM_S390;
never@3156:   #elif  (defined ALPHA)
never@3156:     static  Elf32_Half running_arch_code=EM_ALPHA;
never@3156:   #elif  (defined MIPSEL)
never@3156:     static  Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
never@3156:   #elif  (defined PARISC)
never@3156:     static  Elf32_Half running_arch_code=EM_PARISC;
never@3156:   #elif  (defined MIPS)
never@3156:     static  Elf32_Half running_arch_code=EM_MIPS;
never@3156:   #elif  (defined M68K)
never@3156:     static  Elf32_Half running_arch_code=EM_68K;
never@3156:   #else
never@3156:     #error Method os::dll_load requires that one of following is defined:\
never@3156:          IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
never@3156:   #endif
never@3156: 
never@3156:   // Identify compatability class for VM's architecture and library's architecture
never@3156:   // Obtain string descriptions for architectures
never@3156: 
never@3156:   arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
never@3156:   int running_arch_index=-1;
never@3156: 
never@3156:   for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
never@3156:     if (running_arch_code == arch_array[i].code) {
never@3156:       running_arch_index    = i;
never@3156:     }
never@3156:     if (lib_arch.code == arch_array[i].code) {
never@3156:       lib_arch.compat_class = arch_array[i].compat_class;
never@3156:       lib_arch.name         = arch_array[i].name;
never@3156:     }
never@3156:   }
never@3156: 
never@3156:   assert(running_arch_index != -1,
never@3156:     "Didn't find running architecture code (running_arch_code) in arch_array");
never@3156:   if (running_arch_index == -1) {
never@3156:     // Even though running architecture detection failed
never@3156:     // we may still continue with reporting dlerror() message
never@3156:     return NULL;
never@3156:   }
never@3156: 
never@3156:   if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
never@3156:     ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
never@3156:     return NULL;
never@3156:   }
never@3156: 
never@3156: #ifndef S390
never@3156:   if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
never@3156:     ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
never@3156:     return NULL;
never@3156:   }
never@3156: #endif // !S390
never@3156: 
never@3156:   if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
never@3156:     if ( lib_arch.name!=NULL ) {
never@3156:       ::snprintf(diag_msg_buf, diag_msg_max_length-1,
never@3156:         " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
never@3156:         lib_arch.name, arch_array[running_arch_index].name);
never@3156:     } else {
never@3156:       ::snprintf(diag_msg_buf, diag_msg_max_length-1,
never@3156:       " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
never@3156:         lib_arch.code,
never@3156:         arch_array[running_arch_index].name);
never@3156:     }
never@3156:   }
never@3156: 
never@3156:   return NULL;
never@3156: }
never@3156: #endif /* !__APPLE__ */
never@3156: 
never@3156: // XXX: Do we need a lock around this as per Linux?
never@3156: void* os::dll_lookup(void* handle, const char* name) {
never@3156:   return dlsym(handle, name);
never@3156: }
never@3156: 
never@3156: 
never@3156: static bool _print_ascii_file(const char* filename, outputStream* st) {
never@3156:   int fd = ::open(filename, O_RDONLY);
never@3156:   if (fd == -1) {
never@3156:      return false;
never@3156:   }
never@3156: 
never@3156:   char buf[32];
never@3156:   int bytes;
never@3156:   while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
never@3156:     st->print_raw(buf, bytes);
never@3156:   }
never@3156: 
never@3156:   ::close(fd);
never@3156: 
never@3156:   return true;
never@3156: }
never@3156: 
never@3156: void os::print_dll_info(outputStream *st) {
never@3156:    st->print_cr("Dynamic libraries:");
never@3156: #ifdef RTLD_DI_LINKMAP
never@3156:     Dl_info dli;
never@3156:     void *handle;
never@3156:     Link_map *map;
never@3156:     Link_map *p;
never@3156: 
never@3156:     if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) {
never@3156:         st->print_cr("Error: Cannot print dynamic libraries.");
never@3156:         return;
never@3156:     }
never@3156:     handle = dlopen(dli.dli_fname, RTLD_LAZY);
never@3156:     if (handle == NULL) {
never@3156:         st->print_cr("Error: Cannot print dynamic libraries.");
never@3156:         return;
never@3156:     }
never@3156:     dlinfo(handle, RTLD_DI_LINKMAP, &map);
never@3156:     if (map == NULL) {
never@3156:         st->print_cr("Error: Cannot print dynamic libraries.");
never@3156:         return;
never@3156:     }
never@3156: 
never@3156:     while (map->l_prev != NULL)
never@3156:         map = map->l_prev;
never@3156: 
never@3156:     while (map != NULL) {
never@3156:         st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
never@3156:         map = map->l_next;
never@3156:     }
never@3156: 
never@3156:     dlclose(handle);
never@3156: #elif defined(__APPLE__)
never@3156:     uint32_t count;
never@3156:     uint32_t i;
never@3156: 
never@3156:     count = _dyld_image_count();
never@3156:     for (i = 1; i < count; i++) {
never@3156:         const char *name = _dyld_get_image_name(i);
never@3156:         intptr_t slide = _dyld_get_image_vmaddr_slide(i);
never@3156:         st->print_cr(PTR_FORMAT " \t%s", slide, name);
never@3156:     }
never@3156: #else
never@3156:    st->print_cr("Error: Cannot print dynamic libraries.");
never@3156: #endif
never@3156: }
never@3156: 
nloodin@3783: void os::print_os_info_brief(outputStream* st) {
nloodin@3783:   st->print("Bsd");
nloodin@3783: 
nloodin@3783:   os::Posix::print_uname_info(st);
nloodin@3783: }
never@3156: 
never@3156: void os::print_os_info(outputStream* st) {
never@3156:   st->print("OS:");
nloodin@3783:   st->print("Bsd");
nloodin@3783: 
nloodin@3783:   os::Posix::print_uname_info(st);
nloodin@3783: 
nloodin@3783:   os::Posix::print_rlimit_info(st);
nloodin@3783: 
nloodin@3783:   os::Posix::print_load_average(st);
never@3156: }
never@3156: 
never@3156: void os::pd_print_cpu_info(outputStream* st) {
never@3156:   // Nothing to do for now.
never@3156: }
never@3156: 
never@3156: void os::print_memory_info(outputStream* st) {
never@3156: 
never@3156:   st->print("Memory:");
never@3156:   st->print(" %dk page", os::vm_page_size()>>10);
never@3156: 
never@3156:   st->print(", physical " UINT64_FORMAT "k",
never@3156:             os::physical_memory() >> 10);
never@3156:   st->print("(" UINT64_FORMAT "k free)",
never@3156:             os::available_memory() >> 10);
never@3156:   st->cr();
never@3156: 
never@3156:   // meminfo
never@3156:   st->print("\n/proc/meminfo:\n");
never@3156:   _print_ascii_file("/proc/meminfo", st);
never@3156:   st->cr();
never@3156: }
never@3156: 
never@3156: // Taken from /usr/include/bits/siginfo.h  Supposed to be architecture specific
never@3156: // but they're the same for all the bsd arch that we support
never@3156: // and they're the same for solaris but there's no common place to put this.
never@3156: const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR",
never@3156:                           "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG",
never@3156:                           "ILL_COPROC", "ILL_BADSTK" };
never@3156: 
never@3156: const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV",
never@3156:                           "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES",
never@3156:                           "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" };
never@3156: 
never@3156: const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" };
never@3156: 
never@3156: const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" };
never@3156: 
never@3156: void os::print_siginfo(outputStream* st, void* siginfo) {
never@3156:   st->print("siginfo:");
never@3156: 
never@3156:   const int buflen = 100;
never@3156:   char buf[buflen];
never@3156:   siginfo_t *si = (siginfo_t*)siginfo;
never@3156:   st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen));
never@3156:   if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) {
never@3156:     st->print("si_errno=%s", buf);
never@3156:   } else {
never@3156:     st->print("si_errno=%d", si->si_errno);
never@3156:   }
never@3156:   const int c = si->si_code;
never@3156:   assert(c > 0, "unexpected si_code");
never@3156:   switch (si->si_signo) {
never@3156:   case SIGILL:
never@3156:     st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]);
never@3156:     st->print(", si_addr=" PTR_FORMAT, si->si_addr);
never@3156:     break;
never@3156:   case SIGFPE:
never@3156:     st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]);
never@3156:     st->print(", si_addr=" PTR_FORMAT, si->si_addr);
never@3156:     break;
never@3156:   case SIGSEGV:
never@3156:     st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]);
never@3156:     st->print(", si_addr=" PTR_FORMAT, si->si_addr);
never@3156:     break;
never@3156:   case SIGBUS:
never@3156:     st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]);
never@3156:     st->print(", si_addr=" PTR_FORMAT, si->si_addr);
never@3156:     break;
never@3156:   default:
never@3156:     st->print(", si_code=%d", si->si_code);
never@3156:     // no si_addr
never@3156:   }
never@3156: 
never@3156:   if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
never@3156:       UseSharedSpaces) {
never@3156:     FileMapInfo* mapinfo = FileMapInfo::current_info();
never@3156:     if (mapinfo->is_in_shared_space(si->si_addr)) {
never@3156:       st->print("\n\nError accessing class data sharing archive."   \
never@3156:                 " Mapped file inaccessible during execution, "      \
never@3156:                 " possible disk/network problem.");
never@3156:     }
never@3156:   }
never@3156:   st->cr();
never@3156: }
never@3156: 
never@3156: 
never@3156: static void print_signal_handler(outputStream* st, int sig,
never@3156:                                  char* buf, size_t buflen);
never@3156: 
never@3156: void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
never@3156:   st->print_cr("Signal Handlers:");
never@3156:   print_signal_handler(st, SIGSEGV, buf, buflen);
never@3156:   print_signal_handler(st, SIGBUS , buf, buflen);
never@3156:   print_signal_handler(st, SIGFPE , buf, buflen);
never@3156:   print_signal_handler(st, SIGPIPE, buf, buflen);
never@3156:   print_signal_handler(st, SIGXFSZ, buf, buflen);
never@3156:   print_signal_handler(st, SIGILL , buf, buflen);
never@3156:   print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
never@3156:   print_signal_handler(st, SR_signum, buf, buflen);
never@3156:   print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
never@3156:   print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
never@3156:   print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
never@3156:   print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
never@3156: }
never@3156: 
never@3156: static char saved_jvm_path[MAXPATHLEN] = {0};
never@3156: 
dcubed@4392: // Find the full path to the current module, libjvm
never@3156: void os::jvm_path(char *buf, jint buflen) {
never@3156:   // Error checking.
never@3156:   if (buflen < MAXPATHLEN) {
never@3156:     assert(false, "must use a large-enough buffer");
never@3156:     buf[0] = '\0';
never@3156:     return;
never@3156:   }
never@3156:   // Lazy resolve the path to current module.
never@3156:   if (saved_jvm_path[0] != 0) {
never@3156:     strcpy(buf, saved_jvm_path);
never@3156:     return;
never@3156:   }
never@3156: 
never@3156:   char dli_fname[MAXPATHLEN];
never@3156:   bool ret = dll_address_to_library_name(
never@3156:                 CAST_FROM_FN_PTR(address, os::jvm_path),
never@3156:                 dli_fname, sizeof(dli_fname), NULL);
never@3156:   assert(ret != 0, "cannot locate libjvm");
never@3156:   char *rp = realpath(dli_fname, buf);
never@3156:   if (rp == NULL)
never@3156:     return;
never@3156: 
never@3156:   if (Arguments::created_by_gamma_launcher()) {
never@3156:     // Support for the gamma launcher.  Typical value for buf is
phh@3473:     // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm".  If "/jre/lib/" appears at
never@3156:     // the right place in the string, then assume we are installed in a JDK and
phh@3473:     // we're done.  Otherwise, check for a JAVA_HOME environment variable and
phh@3473:     // construct a path to the JVM being overridden.
phh@3473: 
never@3156:     const char *p = buf + strlen(buf) - 1;
never@3156:     for (int count = 0; p > buf && count < 5; ++count) {
never@3156:       for (--p; p > buf && *p != '/'; --p)
never@3156:         /* empty */ ;
never@3156:     }
never@3156: 
never@3156:     if (strncmp(p, "/jre/lib/", 9) != 0) {
never@3156:       // Look for JAVA_HOME in the environment.
never@3156:       char* java_home_var = ::getenv("JAVA_HOME");
never@3156:       if (java_home_var != NULL && java_home_var[0] != 0) {
never@3156:         char* jrelib_p;
never@3156:         int len;
never@3156: 
dcubed@4392:         // Check the current module name "libjvm"
never@3156:         p = strrchr(buf, '/');
never@3156:         assert(strstr(p, "/libjvm") == p, "invalid library name");
never@3156: 
never@3156:         rp = realpath(java_home_var, buf);
never@3156:         if (rp == NULL)
never@3156:           return;
never@3156: 
never@3156:         // determine if this is a legacy image or modules image
never@3156:         // modules image doesn't have "jre" subdirectory
never@3156:         len = strlen(buf);
never@3156:         jrelib_p = buf + len;
phh@3473: 
phh@3473:         // Add the appropriate library subdir
phh@3473:         snprintf(jrelib_p, buflen-len, "/jre/lib");
never@3156:         if (0 != access(buf, F_OK)) {
phh@3473:           snprintf(jrelib_p, buflen-len, "/lib");
never@3156:         }
never@3156: 
phh@3473:         // Add the appropriate client or server subdir
phh@3473:         len = strlen(buf);
phh@3473:         jrelib_p = buf + len;
phh@3473:         snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
phh@3473:         if (0 != access(buf, F_OK)) {
phh@3473:           snprintf(jrelib_p, buflen-len, "");
phh@3473:         }
phh@3473: 
phh@3473:         // If the path exists within JAVA_HOME, add the JVM library name
phh@3473:         // to complete the path to JVM being overridden.  Otherwise fallback
phh@3473:         // to the path to the current library.
never@3156:         if (0 == access(buf, F_OK)) {
dcubed@4392:           // Use current module name "libjvm"
never@3156:           len = strlen(buf);
dcubed@4392:           snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
never@3156:         } else {
phh@3473:           // Fall back to path of current library
never@3156:           rp = realpath(dli_fname, buf);
never@3156:           if (rp == NULL)
never@3156:             return;
never@3156:         }
never@3156:       }
never@3156:     }
never@3156:   }
never@3156: 
never@3156:   strcpy(saved_jvm_path, buf);
never@3156: }
never@3156: 
never@3156: void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
never@3156:   // no prefix required, not even "_"
never@3156: }
never@3156: 
never@3156: void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
never@3156:   // no suffix required
never@3156: }
never@3156: 
never@3156: ////////////////////////////////////////////////////////////////////////////////
never@3156: // sun.misc.Signal support
never@3156: 
never@3156: static volatile jint sigint_count = 0;
never@3156: 
never@3156: static void
never@3156: UserHandler(int sig, void *siginfo, void *context) {
never@3156:   // 4511530 - sem_post is serialized and handled by the manager thread. When
never@3156:   // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
never@3156:   // don't want to flood the manager thread with sem_post requests.
never@3156:   if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
never@3156:       return;
never@3156: 
never@3156:   // Ctrl-C is pressed during error reporting, likely because the error
never@3156:   // handler fails to abort. Let VM die immediately.
never@3156:   if (sig == SIGINT && is_error_reported()) {
never@3156:      os::die();
never@3156:   }
never@3156: 
never@3156:   os::signal_notify(sig);
never@3156: }
never@3156: 
never@3156: void* os::user_handler() {
never@3156:   return CAST_FROM_FN_PTR(void*, UserHandler);
never@3156: }
never@3156: 
never@3156: extern "C" {
never@3156:   typedef void (*sa_handler_t)(int);
never@3156:   typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
never@3156: }
never@3156: 
never@3156: void* os::signal(int signal_number, void* handler) {
never@3156:   struct sigaction sigAct, oldSigAct;
never@3156: 
never@3156:   sigfillset(&(sigAct.sa_mask));
never@3156:   sigAct.sa_flags   = SA_RESTART|SA_SIGINFO;
never@3156:   sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
never@3156: 
never@3156:   if (sigaction(signal_number, &sigAct, &oldSigAct)) {
never@3156:     // -1 means registration failed
never@3156:     return (void *)-1;
never@3156:   }
never@3156: 
never@3156:   return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
never@3156: }
never@3156: 
never@3156: void os::signal_raise(int signal_number) {
never@3156:   ::raise(signal_number);
never@3156: }
never@3156: 
never@3156: /*
never@3156:  * The following code is moved from os.cpp for making this
never@3156:  * code platform specific, which it is by its very nature.
never@3156:  */
never@3156: 
never@3156: // Will be modified when max signal is changed to be dynamic
never@3156: int os::sigexitnum_pd() {
never@3156:   return NSIG;
never@3156: }
never@3156: 
never@3156: // a counter for each possible signal value
never@3156: static volatile jint pending_signals[NSIG+1] = { 0 };
never@3156: 
never@3156: // Bsd(POSIX) specific hand shaking semaphore.
never@3156: #ifdef __APPLE__
never@3156: static semaphore_t sig_sem;
never@3156: #define SEM_INIT(sem, value)    semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value)
never@3156: #define SEM_WAIT(sem)           semaphore_wait(sem);
never@3156: #define SEM_POST(sem)           semaphore_signal(sem);
never@3156: #else
never@3156: static sem_t sig_sem;
never@3156: #define SEM_INIT(sem, value)    sem_init(&sem, 0, value)
never@3156: #define SEM_WAIT(sem)           sem_wait(&sem);
never@3156: #define SEM_POST(sem)           sem_post(&sem);
never@3156: #endif
never@3156: 
never@3156: void os::signal_init_pd() {
never@3156:   // Initialize signal structures
never@3156:   ::memset((void*)pending_signals, 0, sizeof(pending_signals));
never@3156: 
never@3156:   // Initialize signal semaphore
never@3156:   ::SEM_INIT(sig_sem, 0);
never@3156: }
never@3156: 
never@3156: void os::signal_notify(int sig) {
never@3156:   Atomic::inc(&pending_signals[sig]);
never@3156:   ::SEM_POST(sig_sem);
never@3156: }
never@3156: 
never@3156: static int check_pending_signals(bool wait) {
never@3156:   Atomic::store(0, &sigint_count);
never@3156:   for (;;) {
never@3156:     for (int i = 0; i < NSIG + 1; i++) {
never@3156:       jint n = pending_signals[i];
never@3156:       if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
never@3156:         return i;
never@3156:       }
never@3156:     }
never@3156:     if (!wait) {
never@3156:       return -1;
never@3156:     }
never@3156:     JavaThread *thread = JavaThread::current();
never@3156:     ThreadBlockInVM tbivm(thread);
never@3156: 
never@3156:     bool threadIsSuspended;
never@3156:     do {
never@3156:       thread->set_suspend_equivalent();
never@3156:       // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
never@3156:       ::SEM_WAIT(sig_sem);
never@3156: 
never@3156:       // were we externally suspended while we were waiting?
never@3156:       threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
never@3156:       if (threadIsSuspended) {
never@3156:         //
never@3156:         // The semaphore has been incremented, but while we were waiting
never@3156:         // another thread suspended us. We don't want to continue running
never@3156:         // while suspended because that would surprise the thread that
never@3156:         // suspended us.
never@3156:         //
never@3156:         ::SEM_POST(sig_sem);
never@3156: 
never@3156:         thread->java_suspend_self();
never@3156:       }
never@3156:     } while (threadIsSuspended);
never@3156:   }
never@3156: }
never@3156: 
never@3156: int os::signal_lookup() {
never@3156:   return check_pending_signals(false);
never@3156: }
never@3156: 
never@3156: int os::signal_wait() {
never@3156:   return check_pending_signals(true);
never@3156: }
never@3156: 
never@3156: ////////////////////////////////////////////////////////////////////////////////
never@3156: // Virtual Memory
never@3156: 
never@3156: int os::vm_page_size() {
never@3156:   // Seems redundant as all get out
never@3156:   assert(os::Bsd::page_size() != -1, "must call os::init");
never@3156:   return os::Bsd::page_size();
never@3156: }
never@3156: 
never@3156: // Solaris allocates memory by pages.
never@3156: int os::vm_allocation_granularity() {
never@3156:   assert(os::Bsd::page_size() != -1, "must call os::init");
never@3156:   return os::Bsd::page_size();
never@3156: }
never@3156: 
never@3156: // Rationale behind this function:
never@3156: //  current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
never@3156: //  mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
never@3156: //  samples for JITted code. Here we create private executable mapping over the code cache
never@3156: //  and then we can use standard (well, almost, as mapping can change) way to provide
never@3156: //  info for the reporting script by storing timestamp and location of symbol
never@3156: void bsd_wrap_code(char* base, size_t size) {
never@3156:   static volatile jint cnt = 0;
never@3156: 
never@3156:   if (!UseOprofile) {
never@3156:     return;
never@3156:   }
never@3156: 
never@3156:   char buf[PATH_MAX + 1];
never@3156:   int num = Atomic::add(1, &cnt);
never@3156: 
never@3156:   snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
never@3156:            os::get_temp_directory(), os::current_process_id(), num);
never@3156:   unlink(buf);
never@3156: 
never@3156:   int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
never@3156: 
never@3156:   if (fd != -1) {
never@3156:     off_t rv = ::lseek(fd, size-2, SEEK_SET);
never@3156:     if (rv != (off_t)-1) {
never@3156:       if (::write(fd, "", 1) == 1) {
never@3156:         mmap(base, size,
never@3156:              PROT_READ|PROT_WRITE|PROT_EXEC,
never@3156:              MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
never@3156:       }
never@3156:     }
never@3156:     ::close(fd);
never@3156:     unlink(buf);
never@3156:   }
never@3156: }
never@3156: 
never@3156: // NOTE: Bsd kernel does not really reserve the pages for us.
never@3156: //       All it does is to check if there are enough free pages
never@3156: //       left at the time of mmap(). This could be a potential
never@3156: //       problem.
zgu@3900: bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
never@3156:   int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
never@3156: #ifdef __OpenBSD__
never@3156:   // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
never@3156:   return ::mprotect(addr, size, prot) == 0;
never@3156: #else
never@3156:   uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
never@3156:                                    MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
never@3156:   return res != (uintptr_t) MAP_FAILED;
never@3156: #endif
never@3156: }
never@3156: 
never@3156: 
zgu@3900: bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
never@3156:                        bool exec) {
never@3156:   return commit_memory(addr, size, exec);
never@3156: }
never@3156: 
zgu@3900: void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
never@3156: }
never@3156: 
zgu@3900: void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
never@3156:   ::madvise(addr, bytes, MADV_DONTNEED);
never@3156: }
never@3156: 
never@3156: void os::numa_make_global(char *addr, size_t bytes) {
never@3156: }
never@3156: 
never@3156: void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
never@3156: }
never@3156: 
never@3156: bool os::numa_topology_changed()   { return false; }
never@3156: 
never@3156: size_t os::numa_get_groups_num() {
never@3156:   return 1;
never@3156: }
never@3156: 
never@3156: int os::numa_get_group_id() {
never@3156:   return 0;
never@3156: }
never@3156: 
never@3156: size_t os::numa_get_leaf_groups(int *ids, size_t size) {
never@3156:   if (size > 0) {
never@3156:     ids[0] = 0;
never@3156:     return 1;
never@3156:   }
never@3156:   return 0;
never@3156: }
never@3156: 
never@3156: bool os::get_page_info(char *start, page_info* info) {
never@3156:   return false;
never@3156: }
never@3156: 
never@3156: char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
never@3156:   return end;
never@3156: }
never@3156: 
never@3156: 
zgu@3900: bool os::pd_uncommit_memory(char* addr, size_t size) {
never@3156: #ifdef __OpenBSD__
never@3156:   // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
never@3156:   return ::mprotect(addr, size, PROT_NONE) == 0;
never@3156: #else
never@3156:   uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
never@3156:                 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
never@3156:   return res  != (uintptr_t) MAP_FAILED;
never@3156: #endif
never@3156: }
never@3156: 
zgu@3900: bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
never@3156:   return os::commit_memory(addr, size);
never@3156: }
never@3156: 
never@3156: // If this is a growable mapping, remove the guard pages entirely by
never@3156: // munmap()ping them.  If not, just call uncommit_memory().
never@3156: bool os::remove_stack_guard_pages(char* addr, size_t size) {
never@3156:   return os::uncommit_memory(addr, size);
never@3156: }
never@3156: 
never@3156: static address _highest_vm_reserved_address = NULL;
never@3156: 
never@3156: // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
never@3156: // at 'requested_addr'. If there are existing memory mappings at the same
never@3156: // location, however, they will be overwritten. If 'fixed' is false,
never@3156: // 'requested_addr' is only treated as a hint, the return value may or
never@3156: // may not start from the requested address. Unlike Bsd mmap(), this
never@3156: // function returns NULL to indicate failure.
never@3156: static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
never@3156:   char * addr;
never@3156:   int flags;
never@3156: 
never@3156:   flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
never@3156:   if (fixed) {
never@3156:     assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
never@3156:     flags |= MAP_FIXED;
never@3156:   }
never@3156: 
never@3156:   // Map uncommitted pages PROT_READ and PROT_WRITE, change access
never@3156:   // to PROT_EXEC if executable when we commit the page.
never@3156:   addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE,
never@3156:                        flags, -1, 0);
never@3156: 
never@3156:   if (addr != MAP_FAILED) {
never@3156:     // anon_mmap() should only get called during VM initialization,
never@3156:     // don't need lock (actually we can skip locking even it can be called
never@3156:     // from multiple threads, because _highest_vm_reserved_address is just a
never@3156:     // hint about the upper limit of non-stack memory regions.)
never@3156:     if ((address)addr + bytes > _highest_vm_reserved_address) {
never@3156:       _highest_vm_reserved_address = (address)addr + bytes;
never@3156:     }
never@3156:   }
never@3156: 
never@3156:   return addr == MAP_FAILED ? NULL : addr;
never@3156: }
never@3156: 
never@3156: // Don't update _highest_vm_reserved_address, because there might be memory
never@3156: // regions above addr + size. If so, releasing a memory region only creates
never@3156: // a hole in the address space, it doesn't help prevent heap-stack collision.
never@3156: //
never@3156: static int anon_munmap(char * addr, size_t size) {
never@3156:   return ::munmap(addr, size) == 0;
never@3156: }
never@3156: 
zgu@3900: char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
never@3156:                          size_t alignment_hint) {
never@3156:   return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
never@3156: }
never@3156: 
zgu@3900: bool os::pd_release_memory(char* addr, size_t size) {
never@3156:   return anon_munmap(addr, size);
never@3156: }
never@3156: 
never@3156: static address highest_vm_reserved_address() {
never@3156:   return _highest_vm_reserved_address;
never@3156: }
never@3156: 
never@3156: static bool bsd_mprotect(char* addr, size_t size, int prot) {
never@3156:   // Bsd wants the mprotect address argument to be page aligned.
never@3156:   char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size());
never@3156: 
never@3156:   // According to SUSv3, mprotect() should only be used with mappings
never@3156:   // established by mmap(), and mmap() always maps whole pages. Unaligned
never@3156:   // 'addr' likely indicates problem in the VM (e.g. trying to change
never@3156:   // protection of malloc'ed or statically allocated memory). Check the
never@3156:   // caller if you hit this assert.
never@3156:   assert(addr == bottom, "sanity check");
never@3156: 
never@3156:   size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
never@3156:   return ::mprotect(bottom, size, prot) == 0;
never@3156: }
never@3156: 
never@3156: // Set protections specified
never@3156: bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
never@3156:                         bool is_committed) {
never@3156:   unsigned int p = 0;
never@3156:   switch (prot) {
never@3156:   case MEM_PROT_NONE: p = PROT_NONE; break;
never@3156:   case MEM_PROT_READ: p = PROT_READ; break;
never@3156:   case MEM_PROT_RW:   p = PROT_READ|PROT_WRITE; break;
never@3156:   case MEM_PROT_RWX:  p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
never@3156:   default:
never@3156:     ShouldNotReachHere();
never@3156:   }
never@3156:   // is_committed is unused.
never@3156:   return bsd_mprotect(addr, bytes, p);
never@3156: }
never@3156: 
never@3156: bool os::guard_memory(char* addr, size_t size) {
never@3156:   return bsd_mprotect(addr, size, PROT_NONE);
never@3156: }
never@3156: 
never@3156: bool os::unguard_memory(char* addr, size_t size) {
never@3156:   return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
never@3156: }
never@3156: 
never@3156: bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
sla@4229:   return false;
never@3156: }
never@3156: 
never@3156: /*
never@3156: * Set the coredump_filter bits to include largepages in core dump (bit 6)
never@3156: *
never@3156: * From the coredump_filter documentation:
never@3156: *
never@3156: * - (bit 0) anonymous private memory
never@3156: * - (bit 1) anonymous shared memory
never@3156: * - (bit 2) file-backed private memory
never@3156: * - (bit 3) file-backed shared memory
never@3156: * - (bit 4) ELF header pages in file-backed private memory areas (it is
never@3156: *           effective only if the bit 2 is cleared)
never@3156: * - (bit 5) hugetlb private memory
never@3156: * - (bit 6) hugetlb shared memory
never@3156: */
never@3156: static void set_coredump_filter(void) {
never@3156:   FILE *f;
never@3156:   long cdm;
never@3156: 
never@3156:   if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) {
never@3156:     return;
never@3156:   }
never@3156: 
never@3156:   if (fscanf(f, "%lx", &cdm) != 1) {
never@3156:     fclose(f);
never@3156:     return;
never@3156:   }
never@3156: 
never@3156:   rewind(f);
never@3156: 
never@3156:   if ((cdm & LARGEPAGES_BIT) == 0) {
never@3156:     cdm |= LARGEPAGES_BIT;
never@3156:     fprintf(f, "%#lx", cdm);
never@3156:   }
never@3156: 
never@3156:   fclose(f);
never@3156: }
never@3156: 
never@3156: // Large page support
never@3156: 
never@3156: static size_t _large_page_size = 0;
never@3156: 
never@3156: void os::large_page_init() {
never@3156: }
never@3156: 
never@3156: 
never@3156: char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) {
never@3156:   // "exec" is passed in but not used.  Creating the shared image for
never@3156:   // the code cache doesn't have an SHM_X executable permission to check.
never@3156:   assert(UseLargePages && UseSHM, "only for SHM large pages");
never@3156: 
never@3156:   key_t key = IPC_PRIVATE;
never@3156:   char *addr;
never@3156: 
never@3156:   bool warn_on_failure = UseLargePages &&
never@3156:                         (!FLAG_IS_DEFAULT(UseLargePages) ||
never@3156:                          !FLAG_IS_DEFAULT(LargePageSizeInBytes)
never@3156:                         );
never@3156:   char msg[128];
never@3156: 
never@3156:   // Create a large shared memory region to attach to based on size.
never@3156:   // Currently, size is the total size of the heap
never@3156:   int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W);
never@3156:   if (shmid == -1) {
never@3156:      // Possible reasons for shmget failure:
never@3156:      // 1. shmmax is too small for Java heap.
never@3156:      //    > check shmmax value: cat /proc/sys/kernel/shmmax
never@3156:      //    > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax
never@3156:      // 2. not enough large page memory.
never@3156:      //    > check available large pages: cat /proc/meminfo
never@3156:      //    > increase amount of large pages:
never@3156:      //          echo new_value > /proc/sys/vm/nr_hugepages
never@3156:      //      Note 1: different Bsd may use different name for this property,
never@3156:      //            e.g. on Redhat AS-3 it is "hugetlb_pool".
never@3156:      //      Note 2: it's possible there's enough physical memory available but
never@3156:      //            they are so fragmented after a long run that they can't
never@3156:      //            coalesce into large pages. Try to reserve large pages when
never@3156:      //            the system is still "fresh".
never@3156:      if (warn_on_failure) {
never@3156:        jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno);
never@3156:        warning(msg);
never@3156:      }
never@3156:      return NULL;
never@3156:   }
never@3156: 
never@3156:   // attach to the region
never@3156:   addr = (char*)shmat(shmid, req_addr, 0);
never@3156:   int err = errno;
never@3156: 
never@3156:   // Remove shmid. If shmat() is successful, the actual shared memory segment
never@3156:   // will be deleted when it's detached by shmdt() or when the process
never@3156:   // terminates. If shmat() is not successful this will remove the shared
never@3156:   // segment immediately.
never@3156:   shmctl(shmid, IPC_RMID, NULL);
never@3156: 
never@3156:   if ((intptr_t)addr == -1) {
never@3156:      if (warn_on_failure) {
never@3156:        jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err);
never@3156:        warning(msg);
never@3156:      }
never@3156:      return NULL;
never@3156:   }
never@3156: 
zgu@4711:   // The memory is committed
zgu@4711:   address pc = CALLER_PC;
zgu@4711:   MemTracker::record_virtual_memory_reserve((address)addr, bytes, pc);
zgu@4711:   MemTracker::record_virtual_memory_commit((address)addr, bytes, pc);
zgu@4711: 
never@3156:   return addr;
never@3156: }
never@3156: 
never@3156: bool os::release_memory_special(char* base, size_t bytes) {
never@3156:   // detaching the SHM segment will also delete it, see reserve_memory_special()
never@3156:   int rslt = shmdt(base);
zgu@4711:   if (rslt == 0) {
zgu@4711:     MemTracker::record_virtual_memory_uncommit((address)base, bytes);
zgu@4711:     MemTracker::record_virtual_memory_release((address)base, bytes);
zgu@4711:     return true;
zgu@4711:   } else {
zgu@4711:     return false;
zgu@4711:   }
zgu@4711: 
never@3156: }
never@3156: 
never@3156: size_t os::large_page_size() {
never@3156:   return _large_page_size;
never@3156: }
never@3156: 
never@3156: // HugeTLBFS allows application to commit large page memory on demand;
never@3156: // with SysV SHM the entire memory region must be allocated as shared
never@3156: // memory.
never@3156: bool os::can_commit_large_page_memory() {
never@3156:   return UseHugeTLBFS;
never@3156: }
never@3156: 
never@3156: bool os::can_execute_large_page_memory() {
never@3156:   return UseHugeTLBFS;
never@3156: }
never@3156: 
never@3156: // Reserve memory at an arbitrary address, only if that area is
never@3156: // available (and not reserved for something else).
never@3156: 
zgu@3900: char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
never@3156:   const int max_tries = 10;
never@3156:   char* base[max_tries];
never@3156:   size_t size[max_tries];
never@3156:   const size_t gap = 0x000000;
never@3156: 
never@3156:   // Assert only that the size is a multiple of the page size, since
never@3156:   // that's all that mmap requires, and since that's all we really know
never@3156:   // about at this low abstraction level.  If we need higher alignment,
never@3156:   // we can either pass an alignment to this method or verify alignment
never@3156:   // in one of the methods further up the call chain.  See bug 5044738.
never@3156:   assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
never@3156: 
never@3156:   // Repeatedly allocate blocks until the block is allocated at the
never@3156:   // right spot. Give up after max_tries. Note that reserve_memory() will
never@3156:   // automatically update _highest_vm_reserved_address if the call is
never@3156:   // successful. The variable tracks the highest memory address every reserved
never@3156:   // by JVM. It is used to detect heap-stack collision if running with
never@3156:   // fixed-stack BsdThreads. Because here we may attempt to reserve more
never@3156:   // space than needed, it could confuse the collision detecting code. To
never@3156:   // solve the problem, save current _highest_vm_reserved_address and
never@3156:   // calculate the correct value before return.
never@3156:   address old_highest = _highest_vm_reserved_address;
never@3156: 
never@3156:   // Bsd mmap allows caller to pass an address as hint; give it a try first,
never@3156:   // if kernel honors the hint then we can return immediately.
never@3156:   char * addr = anon_mmap(requested_addr, bytes, false);
never@3156:   if (addr == requested_addr) {
never@3156:      return requested_addr;
never@3156:   }
never@3156: 
never@3156:   if (addr != NULL) {
never@3156:      // mmap() is successful but it fails to reserve at the requested address
never@3156:      anon_munmap(addr, bytes);
never@3156:   }
never@3156: 
never@3156:   int i;
never@3156:   for (i = 0; i < max_tries; ++i) {
never@3156:     base[i] = reserve_memory(bytes);
never@3156: 
never@3156:     if (base[i] != NULL) {
never@3156:       // Is this the block we wanted?
never@3156:       if (base[i] == requested_addr) {
never@3156:         size[i] = bytes;
never@3156:         break;
never@3156:       }
never@3156: 
never@3156:       // Does this overlap the block we wanted? Give back the overlapped
never@3156:       // parts and try again.
never@3156: 
never@3156:       size_t top_overlap = requested_addr + (bytes + gap) - base[i];
never@3156:       if (top_overlap >= 0 && top_overlap < bytes) {
never@3156:         unmap_memory(base[i], top_overlap);
never@3156:         base[i] += top_overlap;
never@3156:         size[i] = bytes - top_overlap;
never@3156:       } else {
never@3156:         size_t bottom_overlap = base[i] + bytes - requested_addr;
never@3156:         if (bottom_overlap >= 0 && bottom_overlap < bytes) {
never@3156:           unmap_memory(requested_addr, bottom_overlap);
never@3156:           size[i] = bytes - bottom_overlap;
never@3156:         } else {
never@3156:           size[i] = bytes;
never@3156:         }
never@3156:       }
never@3156:     }
never@3156:   }
never@3156: 
never@3156:   // Give back the unused reserved pieces.
never@3156: 
never@3156:   for (int j = 0; j < i; ++j) {
never@3156:     if (base[j] != NULL) {
never@3156:       unmap_memory(base[j], size[j]);
never@3156:     }
never@3156:   }
never@3156: 
never@3156:   if (i < max_tries) {
never@3156:     _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes);
never@3156:     return requested_addr;
never@3156:   } else {
never@3156:     _highest_vm_reserved_address = old_highest;
never@3156:     return NULL;
never@3156:   }
never@3156: }
never@3156: 
never@3156: size_t os::read(int fd, void *buf, unsigned int nBytes) {
never@3156:   RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
never@3156: }
never@3156: 
never@3156: // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation.
never@3156: // Solaris uses poll(), bsd uses park().
never@3156: // Poll() is likely a better choice, assuming that Thread.interrupt()
never@3156: // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with
never@3156: // SIGSEGV, see 4355769.
never@3156: 
never@3156: int os::sleep(Thread* thread, jlong millis, bool interruptible) {
never@3156:   assert(thread == Thread::current(),  "thread consistency check");
never@3156: 
never@3156:   ParkEvent * const slp = thread->_SleepEvent ;
never@3156:   slp->reset() ;
never@3156:   OrderAccess::fence() ;
never@3156: 
never@3156:   if (interruptible) {
never@3156:     jlong prevtime = javaTimeNanos();
never@3156: 
never@3156:     for (;;) {
never@3156:       if (os::is_interrupted(thread, true)) {
never@3156:         return OS_INTRPT;
never@3156:       }
never@3156: 
never@3156:       jlong newtime = javaTimeNanos();
never@3156: 
never@3156:       if (newtime - prevtime < 0) {
never@3156:         // time moving backwards, should only happen if no monotonic clock
never@3156:         // not a guarantee() because JVM should not abort on kernel/glibc bugs
never@3156:         assert(!Bsd::supports_monotonic_clock(), "time moving backwards");
never@3156:       } else {
johnc@3339:         millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
never@3156:       }
never@3156: 
never@3156:       if(millis <= 0) {
never@3156:         return OS_OK;
never@3156:       }
never@3156: 
never@3156:       prevtime = newtime;
never@3156: 
never@3156:       {
never@3156:         assert(thread->is_Java_thread(), "sanity check");
never@3156:         JavaThread *jt = (JavaThread *) thread;
never@3156:         ThreadBlockInVM tbivm(jt);
never@3156:         OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
never@3156: 
never@3156:         jt->set_suspend_equivalent();
never@3156:         // cleared by handle_special_suspend_equivalent_condition() or
never@3156:         // java_suspend_self() via check_and_wait_while_suspended()
never@3156: 
never@3156:         slp->park(millis);
never@3156: 
never@3156:         // were we externally suspended while we were waiting?
never@3156:         jt->check_and_wait_while_suspended();
never@3156:       }
never@3156:     }
never@3156:   } else {
never@3156:     OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
never@3156:     jlong prevtime = javaTimeNanos();
never@3156: 
never@3156:     for (;;) {
never@3156:       // It'd be nice to avoid the back-to-back javaTimeNanos() calls on
never@3156:       // the 1st iteration ...
never@3156:       jlong newtime = javaTimeNanos();
never@3156: 
never@3156:       if (newtime - prevtime < 0) {
never@3156:         // time moving backwards, should only happen if no monotonic clock
never@3156:         // not a guarantee() because JVM should not abort on kernel/glibc bugs
never@3156:         assert(!Bsd::supports_monotonic_clock(), "time moving backwards");
never@3156:       } else {
johnc@3339:         millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
never@3156:       }
never@3156: 
never@3156:       if(millis <= 0) break ;
never@3156: 
never@3156:       prevtime = newtime;
never@3156:       slp->park(millis);
never@3156:     }
never@3156:     return OS_OK ;
never@3156:   }
never@3156: }
never@3156: 
never@3156: int os::naked_sleep() {
never@3156:   // %% make the sleep time an integer flag. for now use 1 millisec.
never@3156:   return os::sleep(Thread::current(), 1, false);
never@3156: }
never@3156: 
never@3156: // Sleep forever; naked call to OS-specific sleep; use with CAUTION
never@3156: void os::infinite_sleep() {
never@3156:   while (true) {    // sleep forever ...
never@3156:     ::sleep(100);   // ... 100 seconds at a time
never@3156:   }
never@3156: }
never@3156: 
never@3156: // Used to convert frequent JVM_Yield() to nops
never@3156: bool os::dont_yield() {
never@3156:   return DontYieldALot;
never@3156: }
never@3156: 
never@3156: void os::yield() {
never@3156:   sched_yield();
never@3156: }
never@3156: 
never@3156: os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;}
never@3156: 
never@3156: void os::yield_all(int attempts) {
never@3156:   // Yields to all threads, including threads with lower priorities
never@3156:   // Threads on Bsd are all with same priority. The Solaris style
never@3156:   // os::yield_all() with nanosleep(1ms) is not necessary.
never@3156:   sched_yield();
never@3156: }
never@3156: 
never@3156: // Called from the tight loops to possibly influence time-sharing heuristics
never@3156: void os::loop_breaker(int attempts) {
never@3156:   os::yield_all(attempts);
never@3156: }
never@3156: 
never@3156: ////////////////////////////////////////////////////////////////////////////////
never@3156: // thread priority support
never@3156: 
never@3156: // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
never@3156: // only supports dynamic priority, static priority must be zero. For real-time
never@3156: // applications, Bsd supports SCHED_RR which allows static priority (1-99).
never@3156: // However, for large multi-threaded applications, SCHED_RR is not only slower
never@3156: // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
never@3156: // of 5 runs - Sep 2005).
never@3156: //
never@3156: // The following code actually changes the niceness of kernel-thread/LWP. It
never@3156: // has an assumption that setpriority() only modifies one kernel-thread/LWP,
never@3156: // not the entire user process, and user level threads are 1:1 mapped to kernel
never@3156: // threads. It has always been the case, but could change in the future. For
never@3156: // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
never@3156: // It is only used when ThreadPriorityPolicy=1 and requires root privilege.
never@3156: 
sla@4229: #if !defined(__APPLE__)
phh@3481: int os::java_to_os_priority[CriticalPriority + 1] = {
never@3156:   19,              // 0 Entry should never be used
never@3156: 
never@3156:    0,              // 1 MinPriority
never@3156:    3,              // 2
never@3156:    6,              // 3
never@3156: 
phh@3481:   10,              // 4
phh@3481:   15,              // 5 NormPriority
phh@3481:   18,              // 6
phh@3481: 
phh@3481:   21,              // 7
phh@3481:   25,              // 8
phh@3481:   28,              // 9 NearMaxPriority
phh@3481: 
phh@3481:   31,              // 10 MaxPriority
phh@3481: 
phh@3481:   31               // 11 CriticalPriority
never@3156: };
sla@4229: #else
never@3156: /* Using Mach high-level priority assignments */
phh@3481: int os::java_to_os_priority[CriticalPriority + 1] = {
never@3156:    0,              // 0 Entry should never be used (MINPRI_USER)
never@3156: 
never@3156:   27,              // 1 MinPriority
never@3156:   28,              // 2
never@3156:   29,              // 3
never@3156: 
never@3156:   30,              // 4
never@3156:   31,              // 5 NormPriority (BASEPRI_DEFAULT)
never@3156:   32,              // 6
never@3156: 
never@3156:   33,              // 7
never@3156:   34,              // 8
never@3156:   35,              // 9 NearMaxPriority
never@3156: 
phh@3481:   36,              // 10 MaxPriority
phh@3481: 
phh@3481:   36               // 11 CriticalPriority
never@3156: };
never@3156: #endif
never@3156: 
never@3156: static int prio_init() {
never@3156:   if (ThreadPriorityPolicy == 1) {
never@3156:     // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1
never@3156:     // if effective uid is not root. Perhaps, a more elegant way of doing
never@3156:     // this is to test CAP_SYS_NICE capability, but that will require libcap.so
never@3156:     if (geteuid() != 0) {
never@3156:       if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
never@3156:         warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd");
never@3156:       }
never@3156:       ThreadPriorityPolicy = 0;
never@3156:     }
never@3156:   }
phh@3481:   if (UseCriticalJavaThreadPriority) {
phh@3481:     os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
phh@3481:   }
never@3156:   return 0;
never@3156: }
never@3156: 
never@3156: OSReturn os::set_native_priority(Thread* thread, int newpri) {
never@3156:   if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK;
never@3156: 
never@3156: #ifdef __OpenBSD__
never@3156:   // OpenBSD pthread_setprio starves low priority threads
never@3156:   return OS_OK;
never@3156: #elif defined(__FreeBSD__)
never@3156:   int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
never@3156: #elif defined(__APPLE__) || defined(__NetBSD__)
never@3156:   struct sched_param sp;
never@3156:   int policy;
never@3156:   pthread_t self = pthread_self();
never@3156: 
never@3156:   if (pthread_getschedparam(self, &policy, &sp) != 0)
never@3156:     return OS_ERR;
never@3156: 
never@3156:   sp.sched_priority = newpri;
never@3156:   if (pthread_setschedparam(self, policy, &sp) != 0)
never@3156:     return OS_ERR;
never@3156: 
never@3156:   return OS_OK;
never@3156: #else
never@3156:   int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
never@3156:   return (ret == 0) ? OS_OK : OS_ERR;
never@3156: #endif
never@3156: }
never@3156: 
never@3156: OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
never@3156:   if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) {
never@3156:     *priority_ptr = java_to_os_priority[NormPriority];
never@3156:     return OS_OK;
never@3156:   }
never@3156: 
never@3156:   errno = 0;
never@3156: #if defined(__OpenBSD__) || defined(__FreeBSD__)
never@3156:   *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
never@3156: #elif defined(__APPLE__) || defined(__NetBSD__)
never@3156:   int policy;
never@3156:   struct sched_param sp;
never@3156: 
never@3156:   pthread_getschedparam(pthread_self(), &policy, &sp);
never@3156:   *priority_ptr = sp.sched_priority;
never@3156: #else
never@3156:   *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
never@3156: #endif
never@3156:   return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
never@3156: }
never@3156: 
never@3156: // Hint to the underlying OS that a task switch would not be good.
never@3156: // Void return because it's a hint and can fail.
never@3156: void os::hint_no_preempt() {}
never@3156: 
never@3156: ////////////////////////////////////////////////////////////////////////////////
never@3156: // suspend/resume support
never@3156: 
never@3156: //  the low-level signal-based suspend/resume support is a remnant from the
never@3156: //  old VM-suspension that used to be for java-suspension, safepoints etc,
never@3156: //  within hotspot. Now there is a single use-case for this:
never@3156: //    - calling get_thread_pc() on the VMThread by the flat-profiler task
never@3156: //      that runs in the watcher thread.
never@3156: //  The remaining code is greatly simplified from the more general suspension
never@3156: //  code that used to be used.
never@3156: //
never@3156: //  The protocol is quite simple:
never@3156: //  - suspend:
never@3156: //      - sends a signal to the target thread
never@3156: //      - polls the suspend state of the osthread using a yield loop
never@3156: //      - target thread signal handler (SR_handler) sets suspend state
never@3156: //        and blocks in sigsuspend until continued
never@3156: //  - resume:
never@3156: //      - sets target osthread state to continue
never@3156: //      - sends signal to end the sigsuspend loop in the SR_handler
never@3156: //
never@3156: //  Note that the SR_lock plays no role in this suspend/resume protocol.
never@3156: //
never@3156: 
never@3156: static void resume_clear_context(OSThread *osthread) {
never@3156:   osthread->set_ucontext(NULL);
never@3156:   osthread->set_siginfo(NULL);
never@3156: 
never@3156:   // notify the suspend action is completed, we have now resumed
never@3156:   osthread->sr.clear_suspended();
never@3156: }
never@3156: 
never@3156: static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
never@3156:   osthread->set_ucontext(context);
never@3156:   osthread->set_siginfo(siginfo);
never@3156: }
never@3156: 
never@3156: //
never@3156: // Handler function invoked when a thread's execution is suspended or
never@3156: // resumed. We have to be careful that only async-safe functions are
never@3156: // called here (Note: most pthread functions are not async safe and
never@3156: // should be avoided.)
never@3156: //
never@3156: // Note: sigwait() is a more natural fit than sigsuspend() from an
never@3156: // interface point of view, but sigwait() prevents the signal hander
never@3156: // from being run. libpthread would get very confused by not having
never@3156: // its signal handlers run and prevents sigwait()'s use with the
never@3156: // mutex granting granting signal.
never@3156: //
never@3156: // Currently only ever called on the VMThread
never@3156: //
never@3156: static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
never@3156:   // Save and restore errno to avoid confusing native code with EINTR
never@3156:   // after sigsuspend.
never@3156:   int old_errno = errno;
never@3156: 
never@3156:   Thread* thread = Thread::current();
never@3156:   OSThread* osthread = thread->osthread();
never@3156:   assert(thread->is_VM_thread(), "Must be VMThread");
never@3156:   // read current suspend action
never@3156:   int action = osthread->sr.suspend_action();
simonis@4675:   if (action == os::Bsd::SuspendResume::SR_SUSPEND) {
never@3156:     suspend_save_context(osthread, siginfo, context);
never@3156: 
never@3156:     // Notify the suspend action is about to be completed. do_suspend()
never@3156:     // waits until SR_SUSPENDED is set and then returns. We will wait
never@3156:     // here for a resume signal and that completes the suspend-other
never@3156:     // action. do_suspend/do_resume is always called as a pair from
never@3156:     // the same thread - so there are no races
never@3156: 
never@3156:     // notify the caller
never@3156:     osthread->sr.set_suspended();
never@3156: 
never@3156:     sigset_t suspend_set;  // signals for sigsuspend()
never@3156: 
never@3156:     // get current set of blocked signals and unblock resume signal
never@3156:     pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
never@3156:     sigdelset(&suspend_set, SR_signum);
never@3156: 
never@3156:     // wait here until we are resumed
never@3156:     do {
never@3156:       sigsuspend(&suspend_set);
never@3156:       // ignore all returns until we get a resume signal
simonis@4675:     } while (osthread->sr.suspend_action() != os::Bsd::SuspendResume::SR_CONTINUE);
never@3156: 
never@3156:     resume_clear_context(osthread);
never@3156: 
never@3156:   } else {
simonis@4675:     assert(action == os::Bsd::SuspendResume::SR_CONTINUE, "unexpected sr action");
never@3156:     // nothing special to do - just leave the handler
never@3156:   }
never@3156: 
never@3156:   errno = old_errno;
never@3156: }
never@3156: 
never@3156: 
never@3156: static int SR_initialize() {
never@3156:   struct sigaction act;
never@3156:   char *s;
never@3156:   /* Get signal number to use for suspend/resume */
never@3156:   if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
never@3156:     int sig = ::strtol(s, 0, 10);
never@3156:     if (sig > 0 || sig < NSIG) {
never@3156:         SR_signum = sig;
never@3156:     }
never@3156:   }
never@3156: 
never@3156:   assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
never@3156:         "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
never@3156: 
never@3156:   sigemptyset(&SR_sigset);
never@3156:   sigaddset(&SR_sigset, SR_signum);
never@3156: 
never@3156:   /* Set up signal handler for suspend/resume */
never@3156:   act.sa_flags = SA_RESTART|SA_SIGINFO;
never@3156:   act.sa_handler = (void (*)(int)) SR_handler;
never@3156: 
never@3156:   // SR_signum is blocked by default.
never@3156:   // 4528190 - We also need to block pthread restart signal (32 on all
never@3156:   // supported Bsd platforms). Note that BsdThreads need to block
never@3156:   // this signal for all threads to work properly. So we don't have
never@3156:   // to use hard-coded signal number when setting up the mask.
never@3156:   pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
never@3156: 
never@3156:   if (sigaction(SR_signum, &act, 0) == -1) {
never@3156:     return -1;
never@3156:   }
never@3156: 
never@3156:   // Save signal flag
never@3156:   os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
never@3156:   return 0;
never@3156: }
never@3156: 
never@3156: static int SR_finalize() {
never@3156:   return 0;
never@3156: }
never@3156: 
never@3156: 
never@3156: // returns true on success and false on error - really an error is fatal
never@3156: // but this seems the normal response to library errors
never@3156: static bool do_suspend(OSThread* osthread) {
never@3156:   // mark as suspended and send signal
simonis@4675:   osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_SUSPEND);
never@3156:   int status = pthread_kill(osthread->pthread_id(), SR_signum);
never@3156:   assert_status(status == 0, status, "pthread_kill");
never@3156: 
never@3156:   // check status and wait until notified of suspension
never@3156:   if (status == 0) {
never@3156:     for (int i = 0; !osthread->sr.is_suspended(); i++) {
never@3156:       os::yield_all(i);
never@3156:     }
simonis@4675:     osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_NONE);
never@3156:     return true;
never@3156:   }
never@3156:   else {
simonis@4675:     osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_NONE);
never@3156:     return false;
never@3156:   }
never@3156: }
never@3156: 
never@3156: static void do_resume(OSThread* osthread) {
never@3156:   assert(osthread->sr.is_suspended(), "thread should be suspended");
simonis@4675:   osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_CONTINUE);
never@3156: 
never@3156:   int status = pthread_kill(osthread->pthread_id(), SR_signum);
never@3156:   assert_status(status == 0, status, "pthread_kill");
never@3156:   // check status and wait unit notified of resumption
never@3156:   if (status == 0) {
never@3156:     for (int i = 0; osthread->sr.is_suspended(); i++) {
never@3156:       os::yield_all(i);
never@3156:     }
never@3156:   }
simonis@4675:   osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_NONE);
never@3156: }
never@3156: 
never@3156: ////////////////////////////////////////////////////////////////////////////////
never@3156: // interrupt support
never@3156: 
never@3156: void os::interrupt(Thread* thread) {
never@3156:   assert(Thread::current() == thread || Threads_lock->owned_by_self(),
never@3156:     "possibility of dangling Thread pointer");
never@3156: 
never@3156:   OSThread* osthread = thread->osthread();
never@3156: 
never@3156:   if (!osthread->interrupted()) {
never@3156:     osthread->set_interrupted(true);
never@3156:     // More than one thread can get here with the same value of osthread,
never@3156:     // resulting in multiple notifications.  We do, however, want the store
never@3156:     // to interrupted() to be visible to other threads before we execute unpark().
never@3156:     OrderAccess::fence();
never@3156:     ParkEvent * const slp = thread->_SleepEvent ;
never@3156:     if (slp != NULL) slp->unpark() ;
never@3156:   }
never@3156: 
never@3156:   // For JSR166. Unpark even if interrupt status already was set
never@3156:   if (thread->is_Java_thread())
never@3156:     ((JavaThread*)thread)->parker()->unpark();
never@3156: 
never@3156:   ParkEvent * ev = thread->_ParkEvent ;
never@3156:   if (ev != NULL) ev->unpark() ;
never@3156: 
never@3156: }
never@3156: 
never@3156: bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
never@3156:   assert(Thread::current() == thread || Threads_lock->owned_by_self(),
never@3156:     "possibility of dangling Thread pointer");
never@3156: 
never@3156:   OSThread* osthread = thread->osthread();
never@3156: 
never@3156:   bool interrupted = osthread->interrupted();
never@3156: 
never@3156:   if (interrupted && clear_interrupted) {
never@3156:     osthread->set_interrupted(false);
never@3156:     // consider thread->_SleepEvent->reset() ... optional optimization
never@3156:   }
never@3156: 
never@3156:   return interrupted;
never@3156: }
never@3156: 
never@3156: ///////////////////////////////////////////////////////////////////////////////////
never@3156: // signal handling (except suspend/resume)
never@3156: 
never@3156: // This routine may be used by user applications as a "hook" to catch signals.
never@3156: // The user-defined signal handler must pass unrecognized signals to this
never@3156: // routine, and if it returns true (non-zero), then the signal handler must
never@3156: // return immediately.  If the flag "abort_if_unrecognized" is true, then this
never@3156: // routine will never retun false (zero), but instead will execute a VM panic
never@3156: // routine kill the process.
never@3156: //
never@3156: // If this routine returns false, it is OK to call it again.  This allows
never@3156: // the user-defined signal handler to perform checks either before or after
never@3156: // the VM performs its own checks.  Naturally, the user code would be making
never@3156: // a serious error if it tried to handle an exception (such as a null check
never@3156: // or breakpoint) that the VM was generating for its own correct operation.
never@3156: //
never@3156: // This routine may recognize any of the following kinds of signals:
never@3156: //    SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
never@3156: // It should be consulted by handlers for any of those signals.
never@3156: //
never@3156: // The caller of this routine must pass in the three arguments supplied
never@3156: // to the function referred to in the "sa_sigaction" (not the "sa_handler")
never@3156: // field of the structure passed to sigaction().  This routine assumes that
never@3156: // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
never@3156: //
never@3156: // Note that the VM will print warnings if it detects conflicting signal
never@3156: // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
never@3156: //
never@3156: extern "C" JNIEXPORT int
never@3156: JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
never@3156:                         void* ucontext, int abort_if_unrecognized);
never@3156: 
never@3156: void signalHandler(int sig, siginfo_t* info, void* uc) {
never@3156:   assert(info != NULL && uc != NULL, "it must be old kernel");
hseigel@4608:   int orig_errno = errno;  // Preserve errno value over signal handler.
never@3156:   JVM_handle_bsd_signal(sig, info, uc, true);
hseigel@4608:   errno = orig_errno;
never@3156: }
never@3156: 
never@3156: 
never@3156: // This boolean allows users to forward their own non-matching signals
never@3156: // to JVM_handle_bsd_signal, harmlessly.
never@3156: bool os::Bsd::signal_handlers_are_installed = false;
never@3156: 
never@3156: // For signal-chaining
never@3156: struct sigaction os::Bsd::sigact[MAXSIGNUM];
never@3156: unsigned int os::Bsd::sigs = 0;
never@3156: bool os::Bsd::libjsig_is_loaded = false;
never@3156: typedef struct sigaction *(*get_signal_t)(int);
never@3156: get_signal_t os::Bsd::get_signal_action = NULL;
never@3156: 
never@3156: struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
never@3156:   struct sigaction *actp = NULL;
never@3156: 
never@3156:   if (libjsig_is_loaded) {
never@3156:     // Retrieve the old signal handler from libjsig
never@3156:     actp = (*get_signal_action)(sig);
never@3156:   }
never@3156:   if (actp == NULL) {
never@3156:     // Retrieve the preinstalled signal handler from jvm
never@3156:     actp = get_preinstalled_handler(sig);
never@3156:   }
never@3156: 
never@3156:   return actp;
never@3156: }
never@3156: 
never@3156: static bool call_chained_handler(struct sigaction *actp, int sig,
never@3156:                                  siginfo_t *siginfo, void *context) {
never@3156:   // Call the old signal handler
never@3156:   if (actp->sa_handler == SIG_DFL) {
never@3156:     // It's more reasonable to let jvm treat it as an unexpected exception
never@3156:     // instead of taking the default action.
never@3156:     return false;
never@3156:   } else if (actp->sa_handler != SIG_IGN) {
never@3156:     if ((actp->sa_flags & SA_NODEFER) == 0) {
never@3156:       // automaticlly block the signal
never@3156:       sigaddset(&(actp->sa_mask), sig);
never@3156:     }
never@3156: 
never@3156:     sa_handler_t hand;
never@3156:     sa_sigaction_t sa;
never@3156:     bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
never@3156:     // retrieve the chained handler
never@3156:     if (siginfo_flag_set) {
never@3156:       sa = actp->sa_sigaction;
never@3156:     } else {
never@3156:       hand = actp->sa_handler;
never@3156:     }
never@3156: 
never@3156:     if ((actp->sa_flags & SA_RESETHAND) != 0) {
never@3156:       actp->sa_handler = SIG_DFL;
never@3156:     }
never@3156: 
never@3156:     // try to honor the signal mask
never@3156:     sigset_t oset;
never@3156:     pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
never@3156: 
never@3156:     // call into the chained handler
never@3156:     if (siginfo_flag_set) {
never@3156:       (*sa)(sig, siginfo, context);
never@3156:     } else {
never@3156:       (*hand)(sig);
never@3156:     }
never@3156: 
never@3156:     // restore the signal mask
never@3156:     pthread_sigmask(SIG_SETMASK, &oset, 0);
never@3156:   }
never@3156:   // Tell jvm's signal handler the signal is taken care of.
never@3156:   return true;
never@3156: }
never@3156: 
never@3156: bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
never@3156:   bool chained = false;
never@3156:   // signal-chaining
never@3156:   if (UseSignalChaining) {
never@3156:     struct sigaction *actp = get_chained_signal_action(sig);
never@3156:     if (actp != NULL) {
never@3156:       chained = call_chained_handler(actp, sig, siginfo, context);
never@3156:     }
never@3156:   }
never@3156:   return chained;
never@3156: }
never@3156: 
never@3156: struct sigaction* os::Bsd::get_preinstalled_handler(int sig) {
never@3156:   if ((( (unsigned int)1 << sig ) & sigs) != 0) {
never@3156:     return &sigact[sig];
never@3156:   }
never@3156:   return NULL;
never@3156: }
never@3156: 
never@3156: void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
never@3156:   assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
never@3156:   sigact[sig] = oldAct;
never@3156:   sigs |= (unsigned int)1 << sig;
never@3156: }
never@3156: 
never@3156: // for diagnostic
never@3156: int os::Bsd::sigflags[MAXSIGNUM];
never@3156: 
never@3156: int os::Bsd::get_our_sigflags(int sig) {
never@3156:   assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
never@3156:   return sigflags[sig];
never@3156: }
never@3156: 
never@3156: void os::Bsd::set_our_sigflags(int sig, int flags) {
never@3156:   assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
never@3156:   sigflags[sig] = flags;
never@3156: }
never@3156: 
never@3156: void os::Bsd::set_signal_handler(int sig, bool set_installed) {
never@3156:   // Check for overwrite.
never@3156:   struct sigaction oldAct;
never@3156:   sigaction(sig, (struct sigaction*)NULL, &oldAct);
never@3156: 
never@3156:   void* oldhand = oldAct.sa_sigaction
never@3156:                 ? CAST_FROM_FN_PTR(void*,  oldAct.sa_sigaction)
never@3156:                 : CAST_FROM_FN_PTR(void*,  oldAct.sa_handler);
never@3156:   if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
never@3156:       oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
never@3156:       oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
never@3156:     if (AllowUserSignalHandlers || !set_installed) {
never@3156:       // Do not overwrite; user takes responsibility to forward to us.
never@3156:       return;
never@3156:     } else if (UseSignalChaining) {
never@3156:       // save the old handler in jvm
never@3156:       save_preinstalled_handler(sig, oldAct);
never@3156:       // libjsig also interposes the sigaction() call below and saves the
never@3156:       // old sigaction on it own.
never@3156:     } else {
never@3156:       fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
never@3156:                     "%#lx for signal %d.", (long)oldhand, sig));
never@3156:     }
never@3156:   }
never@3156: 
never@3156:   struct sigaction sigAct;
never@3156:   sigfillset(&(sigAct.sa_mask));
never@3156:   sigAct.sa_handler = SIG_DFL;
never@3156:   if (!set_installed) {
never@3156:     sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
never@3156:   } else {
never@3156:     sigAct.sa_sigaction = signalHandler;
never@3156:     sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
never@3156:   }
never@3156:   // Save flags, which are set by ours
never@3156:   assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
never@3156:   sigflags[sig] = sigAct.sa_flags;
never@3156: 
never@3156:   int ret = sigaction(sig, &sigAct, &oldAct);
never@3156:   assert(ret == 0, "check");
never@3156: 
never@3156:   void* oldhand2  = oldAct.sa_sigaction
never@3156:                   ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
never@3156:                   : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
never@3156:   assert(oldhand2 == oldhand, "no concurrent signal handler installation");
never@3156: }
never@3156: 
never@3156: // install signal handlers for signals that HotSpot needs to
never@3156: // handle in order to support Java-level exception handling.
never@3156: 
never@3156: void os::Bsd::install_signal_handlers() {
never@3156:   if (!signal_handlers_are_installed) {
never@3156:     signal_handlers_are_installed = true;
never@3156: 
never@3156:     // signal-chaining
never@3156:     typedef void (*signal_setting_t)();
never@3156:     signal_setting_t begin_signal_setting = NULL;
never@3156:     signal_setting_t end_signal_setting = NULL;
never@3156:     begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
never@3156:                              dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
never@3156:     if (begin_signal_setting != NULL) {
never@3156:       end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
never@3156:                              dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
never@3156:       get_signal_action = CAST_TO_FN_PTR(get_signal_t,
never@3156:                             dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
never@3156:       libjsig_is_loaded = true;
never@3156:       assert(UseSignalChaining, "should enable signal-chaining");
never@3156:     }
never@3156:     if (libjsig_is_loaded) {
never@3156:       // Tell libjsig jvm is setting signal handlers
never@3156:       (*begin_signal_setting)();
never@3156:     }
never@3156: 
never@3156:     set_signal_handler(SIGSEGV, true);
never@3156:     set_signal_handler(SIGPIPE, true);
never@3156:     set_signal_handler(SIGBUS, true);
never@3156:     set_signal_handler(SIGILL, true);
never@3156:     set_signal_handler(SIGFPE, true);
never@3156:     set_signal_handler(SIGXFSZ, true);
never@3156: 
never@3156: #if defined(__APPLE__)
never@3156:     // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
never@3156:     // signals caught and handled by the JVM. To work around this, we reset the mach task
never@3156:     // signal handler that's placed on our process by CrashReporter. This disables
never@3156:     // CrashReporter-based reporting.
never@3156:     //
never@3156:     // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
never@3156:     // on caught fatal signals.
never@3156:     //
never@3156:     // Additionally, gdb installs both standard BSD signal handlers, and mach exception
never@3156:     // handlers. By replacing the existing task exception handler, we disable gdb's mach
never@3156:     // exception handling, while leaving the standard BSD signal handlers functional.
never@3156:     kern_return_t kr;
never@3156:     kr = task_set_exception_ports(mach_task_self(),
never@3156:         EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
never@3156:         MACH_PORT_NULL,
never@3156:         EXCEPTION_STATE_IDENTITY,
never@3156:         MACHINE_THREAD_STATE);
never@3156: 
never@3156:     assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
never@3156: #endif
never@3156: 
never@3156:     if (libjsig_is_loaded) {
never@3156:       // Tell libjsig jvm finishes setting signal handlers
never@3156:       (*end_signal_setting)();
never@3156:     }
never@3156: 
never@3156:     // We don't activate signal checker if libjsig is in place, we trust ourselves
never@3156:     // and if UserSignalHandler is installed all bets are off
never@3156:     if (CheckJNICalls) {
never@3156:       if (libjsig_is_loaded) {
never@3156:         tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
never@3156:         check_signals = false;
never@3156:       }
never@3156:       if (AllowUserSignalHandlers) {
never@3156:         tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
never@3156:         check_signals = false;
never@3156:       }
never@3156:     }
never@3156:   }
never@3156: }
never@3156: 
never@3156: 
never@3156: /////
never@3156: // glibc on Bsd platform uses non-documented flag
never@3156: // to indicate, that some special sort of signal
never@3156: // trampoline is used.
never@3156: // We will never set this flag, and we should
never@3156: // ignore this flag in our diagnostic
never@3156: #ifdef SIGNIFICANT_SIGNAL_MASK
never@3156: #undef SIGNIFICANT_SIGNAL_MASK
never@3156: #endif
never@3156: #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
never@3156: 
never@3156: static const char* get_signal_handler_name(address handler,
never@3156:                                            char* buf, int buflen) {
never@3156:   int offset;
never@3156:   bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
never@3156:   if (found) {
never@3156:     // skip directory names
never@3156:     const char *p1, *p2;
never@3156:     p1 = buf;
never@3156:     size_t len = strlen(os::file_separator());
never@3156:     while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
never@3156:     jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
never@3156:   } else {
never@3156:     jio_snprintf(buf, buflen, PTR_FORMAT, handler);
never@3156:   }
never@3156:   return buf;
never@3156: }
never@3156: 
never@3156: static void print_signal_handler(outputStream* st, int sig,
never@3156:                                  char* buf, size_t buflen) {
never@3156:   struct sigaction sa;
never@3156: 
never@3156:   sigaction(sig, NULL, &sa);
never@3156: 
never@3156:   // See comment for SIGNIFICANT_SIGNAL_MASK define
never@3156:   sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
never@3156: 
never@3156:   st->print("%s: ", os::exception_name(sig, buf, buflen));
never@3156: 
never@3156:   address handler = (sa.sa_flags & SA_SIGINFO)
never@3156:     ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
never@3156:     : CAST_FROM_FN_PTR(address, sa.sa_handler);
never@3156: 
never@3156:   if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
never@3156:     st->print("SIG_DFL");
never@3156:   } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
never@3156:     st->print("SIG_IGN");
never@3156:   } else {
never@3156:     st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
never@3156:   }
never@3156: 
never@3156:   st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask);
never@3156: 
never@3156:   address rh = VMError::get_resetted_sighandler(sig);
never@3156:   // May be, handler was resetted by VMError?
never@3156:   if(rh != NULL) {
never@3156:     handler = rh;
never@3156:     sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
never@3156:   }
never@3156: 
never@3156:   st->print(", sa_flags="   PTR32_FORMAT, sa.sa_flags);
never@3156: 
never@3156:   // Check: is it our handler?
never@3156:   if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
never@3156:      handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
never@3156:     // It is our signal handler
never@3156:     // check for flags, reset system-used one!
never@3156:     if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
never@3156:       st->print(
never@3156:                 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
never@3156:                 os::Bsd::get_our_sigflags(sig));
never@3156:     }
never@3156:   }
never@3156:   st->cr();
never@3156: }
never@3156: 
never@3156: 
never@3156: #define DO_SIGNAL_CHECK(sig) \
never@3156:   if (!sigismember(&check_signal_done, sig)) \
never@3156:     os::Bsd::check_signal_handler(sig)
never@3156: 
never@3156: // This method is a periodic task to check for misbehaving JNI applications
never@3156: // under CheckJNI, we can add any periodic checks here
never@3156: 
never@3156: void os::run_periodic_checks() {
never@3156: 
never@3156:   if (check_signals == false) return;
never@3156: 
never@3156:   // SEGV and BUS if overridden could potentially prevent
never@3156:   // generation of hs*.log in the event of a crash, debugging
never@3156:   // such a case can be very challenging, so we absolutely
never@3156:   // check the following for a good measure:
never@3156:   DO_SIGNAL_CHECK(SIGSEGV);
never@3156:   DO_SIGNAL_CHECK(SIGILL);
never@3156:   DO_SIGNAL_CHECK(SIGFPE);
never@3156:   DO_SIGNAL_CHECK(SIGBUS);
never@3156:   DO_SIGNAL_CHECK(SIGPIPE);
never@3156:   DO_SIGNAL_CHECK(SIGXFSZ);
never@3156: 
never@3156: 
never@3156:   // ReduceSignalUsage allows the user to override these handlers
never@3156:   // see comments at the very top and jvm_solaris.h
never@3156:   if (!ReduceSignalUsage) {
never@3156:     DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
never@3156:     DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
never@3156:     DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
never@3156:     DO_SIGNAL_CHECK(BREAK_SIGNAL);
never@3156:   }
never@3156: 
never@3156:   DO_SIGNAL_CHECK(SR_signum);
never@3156:   DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
never@3156: }
never@3156: 
never@3156: typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
never@3156: 
never@3156: static os_sigaction_t os_sigaction = NULL;
never@3156: 
never@3156: void os::Bsd::check_signal_handler(int sig) {
never@3156:   char buf[O_BUFLEN];
never@3156:   address jvmHandler = NULL;
never@3156: 
never@3156: 
never@3156:   struct sigaction act;
never@3156:   if (os_sigaction == NULL) {
never@3156:     // only trust the default sigaction, in case it has been interposed
never@3156:     os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
never@3156:     if (os_sigaction == NULL) return;
never@3156:   }
never@3156: 
never@3156:   os_sigaction(sig, (struct sigaction*)NULL, &act);
never@3156: 
never@3156: 
never@3156:   act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
never@3156: 
never@3156:   address thisHandler = (act.sa_flags & SA_SIGINFO)
never@3156:     ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
never@3156:     : CAST_FROM_FN_PTR(address, act.sa_handler) ;
never@3156: 
never@3156: 
never@3156:   switch(sig) {
never@3156:   case SIGSEGV:
never@3156:   case SIGBUS:
never@3156:   case SIGFPE:
never@3156:   case SIGPIPE:
never@3156:   case SIGILL:
never@3156:   case SIGXFSZ:
never@3156:     jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
never@3156:     break;
never@3156: 
never@3156:   case SHUTDOWN1_SIGNAL:
never@3156:   case SHUTDOWN2_SIGNAL:
never@3156:   case SHUTDOWN3_SIGNAL:
never@3156:   case BREAK_SIGNAL:
never@3156:     jvmHandler = (address)user_handler();
never@3156:     break;
never@3156: 
never@3156:   case INTERRUPT_SIGNAL:
never@3156:     jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
never@3156:     break;
never@3156: 
never@3156:   default:
never@3156:     if (sig == SR_signum) {
never@3156:       jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
never@3156:     } else {
never@3156:       return;
never@3156:     }
never@3156:     break;
never@3156:   }
never@3156: 
never@3156:   if (thisHandler != jvmHandler) {
never@3156:     tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
never@3156:     tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
never@3156:     tty->print_cr("  found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
never@3156:     // No need to check this sig any longer
never@3156:     sigaddset(&check_signal_done, sig);
never@3156:   } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
never@3156:     tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
never@3156:     tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig));
never@3156:     tty->print_cr("  found:" PTR32_FORMAT, act.sa_flags);
never@3156:     // No need to check this sig any longer
never@3156:     sigaddset(&check_signal_done, sig);
never@3156:   }
never@3156: 
never@3156:   // Dump all the signal
never@3156:   if (sigismember(&check_signal_done, sig)) {
never@3156:     print_signal_handlers(tty, buf, O_BUFLEN);
never@3156:   }
never@3156: }
never@3156: 
never@3156: extern void report_error(char* file_name, int line_no, char* title, char* format, ...);
never@3156: 
never@3156: extern bool signal_name(int signo, char* buf, size_t len);
never@3156: 
never@3156: const char* os::exception_name(int exception_code, char* buf, size_t size) {
never@3156:   if (0 < exception_code && exception_code <= SIGRTMAX) {
never@3156:     // signal
never@3156:     if (!signal_name(exception_code, buf, size)) {
never@3156:       jio_snprintf(buf, size, "SIG%d", exception_code);
never@3156:     }
never@3156:     return buf;
never@3156:   } else {
never@3156:     return NULL;
never@3156:   }
never@3156: }
never@3156: 
never@3156: // this is called _before_ the most of global arguments have been parsed
never@3156: void os::init(void) {
never@3156:   char dummy;   /* used to get a guess on initial stack address */
never@3156: //  first_hrtime = gethrtime();
never@3156: 
never@3156:   // With BsdThreads the JavaMain thread pid (primordial thread)
never@3156:   // is different than the pid of the java launcher thread.
never@3156:   // So, on Bsd, the launcher thread pid is passed to the VM
never@3156:   // via the sun.java.launcher.pid property.
never@3156:   // Use this property instead of getpid() if it was correctly passed.
never@3156:   // See bug 6351349.
never@3156:   pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
never@3156: 
never@3156:   _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
never@3156: 
never@3156:   clock_tics_per_sec = CLK_TCK;
never@3156: 
never@3156:   init_random(1234567);
never@3156: 
never@3156:   ThreadCritical::initialize();
never@3156: 
never@3156:   Bsd::set_page_size(getpagesize());
never@3156:   if (Bsd::page_size() == -1) {
never@3156:     fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)",
never@3156:                   strerror(errno)));
never@3156:   }
never@3156:   init_page_sizes((size_t) Bsd::page_size());
never@3156: 
never@3156:   Bsd::initialize_system_info();
never@3156: 
never@3156:   // main_thread points to the aboriginal thread
never@3156:   Bsd::_main_thread = pthread_self();
never@3156: 
never@3156:   Bsd::clock_init();
never@3156:   initial_time_count = os::elapsed_counter();
never@3156: 
never@3156: #ifdef __APPLE__
never@3156:   // XXXDARWIN
never@3156:   // Work around the unaligned VM callbacks in hotspot's
never@3156:   // sharedRuntime. The callbacks don't use SSE2 instructions, and work on
never@3156:   // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces
never@3156:   // alignment when doing symbol lookup. To work around this, we force early
never@3156:   // binding of all symbols now, thus binding when alignment is known-good.
never@3156:   _dyld_bind_fully_image_containing_address((const void *) &os::init);
never@3156: #endif
never@3156: }
never@3156: 
never@3156: // To install functions for atexit system call
never@3156: extern "C" {
never@3156:   static void perfMemory_exit_helper() {
never@3156:     perfMemory_exit();
never@3156:   }
never@3156: }
never@3156: 
never@3156: // this is called _after_ the global arguments have been parsed
never@3156: jint os::init_2(void)
never@3156: {
never@3156:   // Allocate a single page and mark it as readable for safepoint polling
never@3156:   address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
never@3156:   guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" );
never@3156: 
never@3156:   os::set_polling_page( polling_page );
never@3156: 
never@3156: #ifndef PRODUCT
never@3156:   if(Verbose && PrintMiscellaneous)
never@3156:     tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
never@3156: #endif
never@3156: 
never@3156:   if (!UseMembar) {
never@3156:     address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
never@3156:     guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
never@3156:     os::set_memory_serialize_page( mem_serialize_page );
never@3156: 
never@3156: #ifndef PRODUCT
never@3156:     if(Verbose && PrintMiscellaneous)
never@3156:       tty->print("[Memory Serialize  Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
never@3156: #endif
never@3156:   }
never@3156: 
never@3156:   os::large_page_init();
never@3156: 
never@3156:   // initialize suspend/resume support - must do this before signal_sets_init()
never@3156:   if (SR_initialize() != 0) {
never@3156:     perror("SR_initialize failed");
never@3156:     return JNI_ERR;
never@3156:   }
never@3156: 
never@3156:   Bsd::signal_sets_init();
never@3156:   Bsd::install_signal_handlers();
never@3156: 
never@3156:   // Check minimum allowable stack size for thread creation and to initialize
never@3156:   // the java system classes, including StackOverflowError - depends on page
never@3156:   // size.  Add a page for compiler2 recursion in main thread.
never@3156:   // Add in 2*BytesPerWord times page size to account for VM stack during
never@3156:   // class initialization depending on 32 or 64 bit VM.
never@3156:   os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed,
never@3156:             (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
never@3156:                     2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size());
never@3156: 
never@3156:   size_t threadStackSizeInBytes = ThreadStackSize * K;
never@3156:   if (threadStackSizeInBytes != 0 &&
never@3156:       threadStackSizeInBytes < os::Bsd::min_stack_allowed) {
never@3156:         tty->print_cr("\nThe stack size specified is too small, "
never@3156:                       "Specify at least %dk",
never@3156:                       os::Bsd::min_stack_allowed/ K);
never@3156:         return JNI_ERR;
never@3156:   }
never@3156: 
never@3156:   // Make the stack size a multiple of the page size so that
never@3156:   // the yellow/red zones can be guarded.
never@3156:   JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
never@3156:         vm_page_size()));
never@3156: 
never@3156:   if (MaxFDLimit) {
never@3156:     // set the number of file descriptors to max. print out error
never@3156:     // if getrlimit/setrlimit fails but continue regardless.
never@3156:     struct rlimit nbr_files;
never@3156:     int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
never@3156:     if (status != 0) {
never@3156:       if (PrintMiscellaneous && (Verbose || WizardMode))
never@3156:         perror("os::init_2 getrlimit failed");
never@3156:     } else {
never@3156:       nbr_files.rlim_cur = nbr_files.rlim_max;
never@3156: 
never@3156: #ifdef __APPLE__
never@3156:       // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
never@3156:       // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
never@3156:       // be used instead
never@3156:       nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
never@3156: #endif
never@3156: 
never@3156:       status = setrlimit(RLIMIT_NOFILE, &nbr_files);
never@3156:       if (status != 0) {
never@3156:         if (PrintMiscellaneous && (Verbose || WizardMode))
never@3156:           perror("os::init_2 setrlimit failed");
never@3156:       }
never@3156:     }
never@3156:   }
never@3156: 
never@3156:   // at-exit methods are called in the reverse order of their registration.
never@3156:   // atexit functions are called on return from main or as a result of a
never@3156:   // call to exit(3C). There can be only 32 of these functions registered
never@3156:   // and atexit() does not set errno.
never@3156: 
never@3156:   if (PerfAllowAtExitRegistration) {
never@3156:     // only register atexit functions if PerfAllowAtExitRegistration is set.
never@3156:     // atexit functions can be delayed until process exit time, which
never@3156:     // can be problematic for embedded VM situations. Embedded VMs should
never@3156:     // call DestroyJavaVM() to assure that VM resources are released.
never@3156: 
never@3156:     // note: perfMemory_exit_helper atexit function may be removed in
never@3156:     // the future if the appropriate cleanup code can be added to the
never@3156:     // VM_Exit VMOperation's doit method.
never@3156:     if (atexit(perfMemory_exit_helper) != 0) {
never@3156:       warning("os::init2 atexit(perfMemory_exit_helper) failed");
never@3156:     }
never@3156:   }
never@3156: 
never@3156:   // initialize thread priority policy
never@3156:   prio_init();
never@3156: 
dcubed@3202: #ifdef __APPLE__
dcubed@3202:   // dynamically link to objective c gc registration
dcubed@3202:   void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
dcubed@3202:   if (handleLibObjc != NULL) {
dcubed@3202:     objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
dcubed@3202:   }
dcubed@3202: #endif
dcubed@3202: 
never@3156:   return JNI_OK;
never@3156: }
never@3156: 
never@3156: // this is called at the end of vm_initialization
never@3156: void os::init_3(void) { }
never@3156: 
never@3156: // Mark the polling page as unreadable
never@3156: void os::make_polling_page_unreadable(void) {
never@3156:   if( !guard_memory((char*)_polling_page, Bsd::page_size()) )
never@3156:     fatal("Could not disable polling page");
never@3156: };
never@3156: 
never@3156: // Mark the polling page as readable
never@3156: void os::make_polling_page_readable(void) {
never@3156:   if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
never@3156:     fatal("Could not enable polling page");
never@3156:   }
never@3156: };
never@3156: 
never@3156: int os::active_processor_count() {
never@3156:   return _processor_count;
never@3156: }
never@3156: 
dcubed@3202: void os::set_native_thread_name(const char *name) {
dcubed@3202: #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
dcubed@3202:   // This is only supported in Snow Leopard and beyond
dcubed@3202:   if (name != NULL) {
dcubed@3202:     // Add a "Java: " prefix to the name
dcubed@3202:     char buf[MAXTHREADNAMESIZE];
dcubed@3202:     snprintf(buf, sizeof(buf), "Java: %s", name);
dcubed@3202:     pthread_setname_np(buf);
dcubed@3202:   }
dcubed@3202: #endif
dcubed@3202: }
dcubed@3202: 
never@3156: bool os::distribute_processes(uint length, uint* distribution) {
never@3156:   // Not yet implemented.
never@3156:   return false;
never@3156: }
never@3156: 
never@3156: bool os::bind_to_processor(uint processor_id) {
never@3156:   // Not yet implemented.
never@3156:   return false;
never@3156: }
never@3156: 
never@3156: ///
never@3156: 
never@3156: // Suspends the target using the signal mechanism and then grabs the PC before
never@3156: // resuming the target. Used by the flat-profiler only
never@3156: ExtendedPC os::get_thread_pc(Thread* thread) {
never@3156:   // Make sure that it is called by the watcher for the VMThread
never@3156:   assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
never@3156:   assert(thread->is_VM_thread(), "Can only be called for VMThread");
never@3156: 
never@3156:   ExtendedPC epc;
never@3156: 
never@3156:   OSThread* osthread = thread->osthread();
never@3156:   if (do_suspend(osthread)) {
never@3156:     if (osthread->ucontext() != NULL) {
never@3156:       epc = os::Bsd::ucontext_get_pc(osthread->ucontext());
never@3156:     } else {
never@3156:       // NULL context is unexpected, double-check this is the VMThread
never@3156:       guarantee(thread->is_VM_thread(), "can only be called for VMThread");
never@3156:     }
never@3156:     do_resume(osthread);
never@3156:   }
never@3156:   // failure means pthread_kill failed for some reason - arguably this is
never@3156:   // a fatal problem, but such problems are ignored elsewhere
never@3156: 
never@3156:   return epc;
never@3156: }
never@3156: 
never@3156: int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime)
never@3156: {
never@3156:   return pthread_cond_timedwait(_cond, _mutex, _abstime);
never@3156: }
never@3156: 
never@3156: ////////////////////////////////////////////////////////////////////////////////
never@3156: // debug support
never@3156: 
never@3156: static address same_page(address x, address y) {
never@3156:   int page_bits = -os::vm_page_size();
never@3156:   if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
never@3156:     return x;
never@3156:   else if (x > y)
never@3156:     return (address)(intptr_t(y) | ~page_bits) + 1;
never@3156:   else
never@3156:     return (address)(intptr_t(y) & page_bits);
never@3156: }
never@3156: 
never@3156: bool os::find(address addr, outputStream* st) {
never@3156:   Dl_info dlinfo;
never@3156:   memset(&dlinfo, 0, sizeof(dlinfo));
never@3156:   if (dladdr(addr, &dlinfo)) {
never@3156:     st->print(PTR_FORMAT ": ", addr);
never@3156:     if (dlinfo.dli_sname != NULL) {
never@3156:       st->print("%s+%#x", dlinfo.dli_sname,
never@3156:                  addr - (intptr_t)dlinfo.dli_saddr);
never@3156:     } else if (dlinfo.dli_fname) {
never@3156:       st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase);
never@3156:     } else {
never@3156:       st->print("<absolute address>");
never@3156:     }
never@3156:     if (dlinfo.dli_fname) {
never@3156:       st->print(" in %s", dlinfo.dli_fname);
never@3156:     }
never@3156:     if (dlinfo.dli_fbase) {
never@3156:       st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
never@3156:     }
never@3156:     st->cr();
never@3156: 
never@3156:     if (Verbose) {
never@3156:       // decode some bytes around the PC
never@3156:       address begin = same_page(addr-40, addr);
never@3156:       address end   = same_page(addr+40, addr);
never@3156:       address       lowest = (address) dlinfo.dli_sname;
never@3156:       if (!lowest)  lowest = (address) dlinfo.dli_fbase;
never@3156:       if (begin < lowest)  begin = lowest;
never@3156:       Dl_info dlinfo2;
never@3156:       if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr
never@3156:           && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
never@3156:         end = (address) dlinfo2.dli_saddr;
never@3156:       Disassembler::decode(begin, end, st);
never@3156:     }
never@3156:     return true;
never@3156:   }
never@3156:   return false;
never@3156: }
never@3156: 
never@3156: ////////////////////////////////////////////////////////////////////////////////
never@3156: // misc
never@3156: 
never@3156: // This does not do anything on Bsd. This is basically a hook for being
never@3156: // able to use structured exception handling (thread-local exception filters)
never@3156: // on, e.g., Win32.
never@3156: void
never@3156: os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
never@3156:                          JavaCallArguments* args, Thread* thread) {
never@3156:   f(value, method, args, thread);
never@3156: }
never@3156: 
never@3156: void os::print_statistics() {
never@3156: }
never@3156: 
never@3156: int os::message_box(const char* title, const char* message) {
never@3156:   int i;
never@3156:   fdStream err(defaultStream::error_fd());
never@3156:   for (i = 0; i < 78; i++) err.print_raw("=");
never@3156:   err.cr();
never@3156:   err.print_raw_cr(title);
never@3156:   for (i = 0; i < 78; i++) err.print_raw("-");
never@3156:   err.cr();
never@3156:   err.print_raw_cr(message);
never@3156:   for (i = 0; i < 78; i++) err.print_raw("=");
never@3156:   err.cr();
never@3156: 
never@3156:   char buf[16];
never@3156:   // Prevent process from exiting upon "read error" without consuming all CPU
never@3156:   while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
never@3156: 
never@3156:   return buf[0] == 'y' || buf[0] == 'Y';
never@3156: }
never@3156: 
never@3156: int os::stat(const char *path, struct stat *sbuf) {
never@3156:   char pathbuf[MAX_PATH];
never@3156:   if (strlen(path) > MAX_PATH - 1) {
never@3156:     errno = ENAMETOOLONG;
never@3156:     return -1;
never@3156:   }
never@3156:   os::native_path(strcpy(pathbuf, path));
never@3156:   return ::stat(pathbuf, sbuf);
never@3156: }
never@3156: 
never@3156: bool os::check_heap(bool force) {
never@3156:   return true;
never@3156: }
never@3156: 
never@3156: int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) {
never@3156:   return ::vsnprintf(buf, count, format, args);
never@3156: }
never@3156: 
never@3156: // Is a (classpath) directory empty?
never@3156: bool os::dir_is_empty(const char* path) {
never@3156:   DIR *dir = NULL;
never@3156:   struct dirent *ptr;
never@3156: 
never@3156:   dir = opendir(path);
never@3156:   if (dir == NULL) return true;
never@3156: 
never@3156:   /* Scan the directory */
never@3156:   bool result = true;
never@3156:   char buf[sizeof(struct dirent) + MAX_PATH];
never@3156:   while (result && (ptr = ::readdir(dir)) != NULL) {
never@3156:     if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
never@3156:       result = false;
never@3156:     }
never@3156:   }
never@3156:   closedir(dir);
never@3156:   return result;
never@3156: }
never@3156: 
never@3156: // This code originates from JDK's sysOpen and open64_w
never@3156: // from src/solaris/hpi/src/system_md.c
never@3156: 
never@3156: #ifndef O_DELETE
never@3156: #define O_DELETE 0x10000
never@3156: #endif
never@3156: 
never@3156: // Open a file. Unlink the file immediately after open returns
never@3156: // if the specified oflag has the O_DELETE flag set.
never@3156: // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
never@3156: 
never@3156: int os::open(const char *path, int oflag, int mode) {
never@3156: 
never@3156:   if (strlen(path) > MAX_PATH - 1) {
never@3156:     errno = ENAMETOOLONG;
never@3156:     return -1;
never@3156:   }
never@3156:   int fd;
never@3156:   int o_delete = (oflag & O_DELETE);
never@3156:   oflag = oflag & ~O_DELETE;
never@3156: 
never@3156:   fd = ::open(path, oflag, mode);
never@3156:   if (fd == -1) return -1;
never@3156: 
never@3156:   //If the open succeeded, the file might still be a directory
never@3156:   {
never@3156:     struct stat buf;
never@3156:     int ret = ::fstat(fd, &buf);
never@3156:     int st_mode = buf.st_mode;
never@3156: 
never@3156:     if (ret != -1) {
never@3156:       if ((st_mode & S_IFMT) == S_IFDIR) {
never@3156:         errno = EISDIR;
never@3156:         ::close(fd);
never@3156:         return -1;
never@3156:       }
never@3156:     } else {
never@3156:       ::close(fd);
never@3156:       return -1;
never@3156:     }
never@3156:   }
never@3156: 
never@3156:     /*
never@3156:      * All file descriptors that are opened in the JVM and not
never@3156:      * specifically destined for a subprocess should have the
never@3156:      * close-on-exec flag set.  If we don't set it, then careless 3rd
never@3156:      * party native code might fork and exec without closing all
never@3156:      * appropriate file descriptors (e.g. as we do in closeDescriptors in
never@3156:      * UNIXProcess.c), and this in turn might:
never@3156:      *
never@3156:      * - cause end-of-file to fail to be detected on some file
never@3156:      *   descriptors, resulting in mysterious hangs, or
never@3156:      *
never@3156:      * - might cause an fopen in the subprocess to fail on a system
never@3156:      *   suffering from bug 1085341.
never@3156:      *
never@3156:      * (Yes, the default setting of the close-on-exec flag is a Unix
never@3156:      * design flaw)
never@3156:      *
never@3156:      * See:
never@3156:      * 1085341: 32-bit stdio routines should support file descriptors >255
never@3156:      * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
never@3156:      * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
never@3156:      */
never@3156: #ifdef FD_CLOEXEC
never@3156:     {
never@3156:         int flags = ::fcntl(fd, F_GETFD);
never@3156:         if (flags != -1)
never@3156:             ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
never@3156:     }
never@3156: #endif
never@3156: 
never@3156:   if (o_delete != 0) {
never@3156:     ::unlink(path);
never@3156:   }
never@3156:   return fd;
never@3156: }
never@3156: 
never@3156: 
never@3156: // create binary file, rewriting existing file if required
never@3156: int os::create_binary_file(const char* path, bool rewrite_existing) {
never@3156:   int oflags = O_WRONLY | O_CREAT;
never@3156:   if (!rewrite_existing) {
never@3156:     oflags |= O_EXCL;
never@3156:   }
never@3156:   return ::open(path, oflags, S_IREAD | S_IWRITE);
never@3156: }
never@3156: 
never@3156: // return current position of file pointer
never@3156: jlong os::current_file_offset(int fd) {
never@3156:   return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
never@3156: }
never@3156: 
never@3156: // move file pointer to the specified offset
never@3156: jlong os::seek_to_file_offset(int fd, jlong offset) {
never@3156:   return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
never@3156: }
never@3156: 
never@3156: // This code originates from JDK's sysAvailable
never@3156: // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
never@3156: 
never@3156: int os::available(int fd, jlong *bytes) {
never@3156:   jlong cur, end;
never@3156:   int mode;
never@3156:   struct stat buf;
never@3156: 
never@3156:   if (::fstat(fd, &buf) >= 0) {
never@3156:     mode = buf.st_mode;
never@3156:     if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
never@3156:       /*
never@3156:       * XXX: is the following call interruptible? If so, this might
never@3156:       * need to go through the INTERRUPT_IO() wrapper as for other
never@3156:       * blocking, interruptible calls in this file.
never@3156:       */
never@3156:       int n;
never@3156:       if (::ioctl(fd, FIONREAD, &n) >= 0) {
never@3156:         *bytes = n;
never@3156:         return 1;
never@3156:       }
never@3156:     }
never@3156:   }
never@3156:   if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
never@3156:     return 0;
never@3156:   } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
never@3156:     return 0;
never@3156:   } else if (::lseek(fd, cur, SEEK_SET) == -1) {
never@3156:     return 0;
never@3156:   }
never@3156:   *bytes = end - cur;
never@3156:   return 1;
never@3156: }
never@3156: 
never@3156: int os::socket_available(int fd, jint *pbytes) {
never@3156:    if (fd < 0)
never@3156:      return OS_OK;
never@3156: 
never@3156:    int ret;
never@3156: 
never@3156:    RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
never@3156: 
never@3156:    //%% note ioctl can return 0 when successful, JVM_SocketAvailable
never@3156:    // is expected to return 0 on failure and 1 on success to the jdk.
never@3156: 
never@3156:    return (ret == OS_ERR) ? 0 : 1;
never@3156: }
never@3156: 
never@3156: // Map a block of memory.
zgu@3900: char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
never@3156:                      char *addr, size_t bytes, bool read_only,
never@3156:                      bool allow_exec) {
never@3156:   int prot;
never@3156:   int flags;
never@3156: 
never@3156:   if (read_only) {
never@3156:     prot = PROT_READ;
never@3156:     flags = MAP_SHARED;
never@3156:   } else {
never@3156:     prot = PROT_READ | PROT_WRITE;
never@3156:     flags = MAP_PRIVATE;
never@3156:   }
never@3156: 
never@3156:   if (allow_exec) {
never@3156:     prot |= PROT_EXEC;
never@3156:   }
never@3156: 
never@3156:   if (addr != NULL) {
never@3156:     flags |= MAP_FIXED;
never@3156:   }
never@3156: 
never@3156:   char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
never@3156:                                      fd, file_offset);
never@3156:   if (mapped_address == MAP_FAILED) {
never@3156:     return NULL;
never@3156:   }
never@3156:   return mapped_address;
never@3156: }
never@3156: 
never@3156: 
never@3156: // Remap a block of memory.
zgu@3900: char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
never@3156:                        char *addr, size_t bytes, bool read_only,
never@3156:                        bool allow_exec) {
never@3156:   // same as map_memory() on this OS
never@3156:   return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
never@3156:                         allow_exec);
never@3156: }
never@3156: 
never@3156: 
never@3156: // Unmap a block of memory.
zgu@3900: bool os::pd_unmap_memory(char* addr, size_t bytes) {
never@3156:   return munmap(addr, bytes) == 0;
never@3156: }
never@3156: 
never@3156: // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
never@3156: // are used by JVM M&M and JVMTI to get user+sys or user CPU time
never@3156: // of a thread.
never@3156: //
never@3156: // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
never@3156: // the fast estimate available on the platform.
never@3156: 
never@3156: jlong os::current_thread_cpu_time() {
never@3156: #ifdef __APPLE__
never@3156:   return os::thread_cpu_time(Thread::current(), true /* user + sys */);
morris@4689: #else
morris@4689:   Unimplemented();
morris@4689:   return 0;
never@3156: #endif
never@3156: }
never@3156: 
never@3156: jlong os::thread_cpu_time(Thread* thread) {
morris@4689: #ifdef __APPLE__
morris@4689:   return os::thread_cpu_time(thread, true /* user + sys */);
morris@4689: #else
morris@4689:   Unimplemented();
morris@4689:   return 0;
morris@4689: #endif
never@3156: }
never@3156: 
never@3156: jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
never@3156: #ifdef __APPLE__
never@3156:   return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
morris@4689: #else
morris@4689:   Unimplemented();
morris@4689:   return 0;
never@3156: #endif
never@3156: }
never@3156: 
never@3156: jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
never@3156: #ifdef __APPLE__
never@3156:   struct thread_basic_info tinfo;
never@3156:   mach_msg_type_number_t tcount = THREAD_INFO_MAX;
never@3156:   kern_return_t kr;
sla@3587:   thread_t mach_thread;
sla@3587: 
sla@3587:   mach_thread = thread->osthread()->thread_id();
never@3156:   kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
never@3156:   if (kr != KERN_SUCCESS)
never@3156:     return -1;
never@3156: 
never@3156:   if (user_sys_cpu_time) {
never@3156:     jlong nanos;
never@3156:     nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
never@3156:     nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
never@3156:     return nanos;
never@3156:   } else {
never@3156:     return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
never@3156:   }
morris@4689: #else
morris@4689:   Unimplemented();
morris@4689:   return 0;
never@3156: #endif
never@3156: }
never@3156: 
never@3156: 
never@3156: void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
never@3156:   info_ptr->max_value = ALL_64_BITS;       // will not wrap in less than 64 bits
never@3156:   info_ptr->may_skip_backward = false;     // elapsed time not wall time
never@3156:   info_ptr->may_skip_forward = false;      // elapsed time not wall time
never@3156:   info_ptr->kind = JVMTI_TIMER_TOTAL_CPU;  // user+system time is returned
never@3156: }
never@3156: 
never@3156: void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
never@3156:   info_ptr->max_value = ALL_64_BITS;       // will not wrap in less than 64 bits
never@3156:   info_ptr->may_skip_backward = false;     // elapsed time not wall time
never@3156:   info_ptr->may_skip_forward = false;      // elapsed time not wall time
never@3156:   info_ptr->kind = JVMTI_TIMER_TOTAL_CPU;  // user+system time is returned
never@3156: }
never@3156: 
never@3156: bool os::is_thread_cpu_time_supported() {
never@3156: #ifdef __APPLE__
never@3156:   return true;
sla@4229: #else
never@3156:   return false;
never@3156: #endif
never@3156: }
never@3156: 
never@3156: // System loadavg support.  Returns -1 if load average cannot be obtained.
never@3156: // Bsd doesn't yet have a (official) notion of processor sets,
never@3156: // so just return the system wide load average.
never@3156: int os::loadavg(double loadavg[], int nelem) {
never@3156:   return ::getloadavg(loadavg, nelem);
never@3156: }
never@3156: 
never@3156: void os::pause() {
never@3156:   char filename[MAX_PATH];
never@3156:   if (PauseAtStartupFile && PauseAtStartupFile[0]) {
never@3156:     jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
never@3156:   } else {
never@3156:     jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
never@3156:   }
never@3156: 
never@3156:   int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
never@3156:   if (fd != -1) {
never@3156:     struct stat buf;
never@3156:     ::close(fd);
never@3156:     while (::stat(filename, &buf) == 0) {
never@3156:       (void)::poll(NULL, 0, 100);
never@3156:     }
never@3156:   } else {
never@3156:     jio_fprintf(stderr,
never@3156:       "Could not open pause file '%s', continuing immediately.\n", filename);
never@3156:   }
never@3156: }
never@3156: 
never@3156: 
never@3156: // Refer to the comments in os_solaris.cpp park-unpark.
never@3156: //
never@3156: // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
never@3156: // hang indefinitely.  For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
never@3156: // For specifics regarding the bug see GLIBC BUGID 261237 :
never@3156: //    http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
never@3156: // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
never@3156: // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
never@3156: // is used.  (The simple C test-case provided in the GLIBC bug report manifests the
never@3156: // hang).  The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
never@3156: // and monitorenter when we're using 1-0 locking.  All those operations may result in
never@3156: // calls to pthread_cond_timedwait().  Using LD_ASSUME_KERNEL to use an older version
never@3156: // of libpthread avoids the problem, but isn't practical.
never@3156: //
never@3156: // Possible remedies:
never@3156: //
never@3156: // 1.   Establish a minimum relative wait time.  50 to 100 msecs seems to work.
never@3156: //      This is palliative and probabilistic, however.  If the thread is preempted
never@3156: //      between the call to compute_abstime() and pthread_cond_timedwait(), more
never@3156: //      than the minimum period may have passed, and the abstime may be stale (in the
never@3156: //      past) resultin in a hang.   Using this technique reduces the odds of a hang
never@3156: //      but the JVM is still vulnerable, particularly on heavily loaded systems.
never@3156: //
never@3156: // 2.   Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
never@3156: //      of the usual flag-condvar-mutex idiom.  The write side of the pipe is set
never@3156: //      NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
never@3156: //      reduces to poll()+read().  This works well, but consumes 2 FDs per extant
never@3156: //      thread.
never@3156: //
never@3156: // 3.   Embargo pthread_cond_timedwait() and implement a native "chron" thread
never@3156: //      that manages timeouts.  We'd emulate pthread_cond_timedwait() by enqueuing
never@3156: //      a timeout request to the chron thread and then blocking via pthread_cond_wait().
never@3156: //      This also works well.  In fact it avoids kernel-level scalability impediments
never@3156: //      on certain platforms that don't handle lots of active pthread_cond_timedwait()
never@3156: //      timers in a graceful fashion.
never@3156: //
never@3156: // 4.   When the abstime value is in the past it appears that control returns
never@3156: //      correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
never@3156: //      Subsequent timedwait/wait calls may hang indefinitely.  Given that, we
never@3156: //      can avoid the problem by reinitializing the condvar -- by cond_destroy()
never@3156: //      followed by cond_init() -- after all calls to pthread_cond_timedwait().
never@3156: //      It may be possible to avoid reinitialization by checking the return
never@3156: //      value from pthread_cond_timedwait().  In addition to reinitializing the
never@3156: //      condvar we must establish the invariant that cond_signal() is only called
never@3156: //      within critical sections protected by the adjunct mutex.  This prevents
never@3156: //      cond_signal() from "seeing" a condvar that's in the midst of being
never@3156: //      reinitialized or that is corrupt.  Sadly, this invariant obviates the
never@3156: //      desirable signal-after-unlock optimization that avoids futile context switching.
never@3156: //
never@3156: //      I'm also concerned that some versions of NTPL might allocate an auxilliary
never@3156: //      structure when a condvar is used or initialized.  cond_destroy()  would
never@3156: //      release the helper structure.  Our reinitialize-after-timedwait fix
never@3156: //      put excessive stress on malloc/free and locks protecting the c-heap.
never@3156: //
never@3156: // We currently use (4).  See the WorkAroundNTPLTimedWaitHang flag.
never@3156: // It may be possible to refine (4) by checking the kernel and NTPL verisons
never@3156: // and only enabling the work-around for vulnerable environments.
never@3156: 
never@3156: // utility to compute the abstime argument to timedwait:
never@3156: // millis is the relative timeout time
never@3156: // abstime will be the absolute timeout time
never@3156: // TODO: replace compute_abstime() with unpackTime()
never@3156: 
never@3156: static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) {
never@3156:   if (millis < 0)  millis = 0;
never@3156:   struct timeval now;
never@3156:   int status = gettimeofday(&now, NULL);
never@3156:   assert(status == 0, "gettimeofday");
never@3156:   jlong seconds = millis / 1000;
never@3156:   millis %= 1000;
never@3156:   if (seconds > 50000000) { // see man cond_timedwait(3T)
never@3156:     seconds = 50000000;
never@3156:   }
never@3156:   abstime->tv_sec = now.tv_sec  + seconds;
never@3156:   long       usec = now.tv_usec + millis * 1000;
never@3156:   if (usec >= 1000000) {
never@3156:     abstime->tv_sec += 1;
never@3156:     usec -= 1000000;
never@3156:   }
never@3156:   abstime->tv_nsec = usec * 1000;
never@3156:   return abstime;
never@3156: }
never@3156: 
never@3156: 
never@3156: // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
never@3156: // Conceptually TryPark() should be equivalent to park(0).
never@3156: 
never@3156: int os::PlatformEvent::TryPark() {
never@3156:   for (;;) {
never@3156:     const int v = _Event ;
never@3156:     guarantee ((v == 0) || (v == 1), "invariant") ;
never@3156:     if (Atomic::cmpxchg (0, &_Event, v) == v) return v  ;
never@3156:   }
never@3156: }
never@3156: 
never@3156: void os::PlatformEvent::park() {       // AKA "down()"
never@3156:   // Invariant: Only the thread associated with the Event/PlatformEvent
never@3156:   // may call park().
never@3156:   // TODO: assert that _Assoc != NULL or _Assoc == Self
never@3156:   int v ;
never@3156:   for (;;) {
never@3156:       v = _Event ;
never@3156:       if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
never@3156:   }
never@3156:   guarantee (v >= 0, "invariant") ;
never@3156:   if (v == 0) {
never@3156:      // Do this the hard way by blocking ...
never@3156:      int status = pthread_mutex_lock(_mutex);
never@3156:      assert_status(status == 0, status, "mutex_lock");
never@3156:      guarantee (_nParked == 0, "invariant") ;
never@3156:      ++ _nParked ;
never@3156:      while (_Event < 0) {
never@3156:         status = pthread_cond_wait(_cond, _mutex);
never@3156:         // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
never@3156:         // Treat this the same as if the wait was interrupted
never@3156:         if (status == ETIMEDOUT) { status = EINTR; }
never@3156:         assert_status(status == 0 || status == EINTR, status, "cond_wait");
never@3156:      }
never@3156:      -- _nParked ;
never@3156: 
never@3156:     _Event = 0 ;
never@3156:      status = pthread_mutex_unlock(_mutex);
never@3156:      assert_status(status == 0, status, "mutex_unlock");
dcubed@4471:     // Paranoia to ensure our locked and lock-free paths interact
dcubed@4471:     // correctly with each other.
dcubed@4471:     OrderAccess::fence();
never@3156:   }
never@3156:   guarantee (_Event >= 0, "invariant") ;
never@3156: }
never@3156: 
never@3156: int os::PlatformEvent::park(jlong millis) {
never@3156:   guarantee (_nParked == 0, "invariant") ;
never@3156: 
never@3156:   int v ;
never@3156:   for (;;) {
never@3156:       v = _Event ;
never@3156:       if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
never@3156:   }
never@3156:   guarantee (v >= 0, "invariant") ;
never@3156:   if (v != 0) return OS_OK ;
never@3156: 
never@3156:   // We do this the hard way, by blocking the thread.
never@3156:   // Consider enforcing a minimum timeout value.
never@3156:   struct timespec abst;
never@3156:   compute_abstime(&abst, millis);
never@3156: 
never@3156:   int ret = OS_TIMEOUT;
never@3156:   int status = pthread_mutex_lock(_mutex);
never@3156:   assert_status(status == 0, status, "mutex_lock");
never@3156:   guarantee (_nParked == 0, "invariant") ;
never@3156:   ++_nParked ;
never@3156: 
never@3156:   // Object.wait(timo) will return because of
never@3156:   // (a) notification
never@3156:   // (b) timeout
never@3156:   // (c) thread.interrupt
never@3156:   //
never@3156:   // Thread.interrupt and object.notify{All} both call Event::set.
never@3156:   // That is, we treat thread.interrupt as a special case of notification.
never@3156:   // The underlying Solaris implementation, cond_timedwait, admits
never@3156:   // spurious/premature wakeups, but the JLS/JVM spec prevents the
never@3156:   // JVM from making those visible to Java code.  As such, we must
never@3156:   // filter out spurious wakeups.  We assume all ETIME returns are valid.
never@3156:   //
never@3156:   // TODO: properly differentiate simultaneous notify+interrupt.
never@3156:   // In that case, we should propagate the notify to another waiter.
never@3156: 
never@3156:   while (_Event < 0) {
never@3156:     status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst);
never@3156:     if (status != 0 && WorkAroundNPTLTimedWaitHang) {
never@3156:       pthread_cond_destroy (_cond);
never@3156:       pthread_cond_init (_cond, NULL) ;
never@3156:     }
never@3156:     assert_status(status == 0 || status == EINTR ||
never@3156:                   status == ETIMEDOUT,
never@3156:                   status, "cond_timedwait");
never@3156:     if (!FilterSpuriousWakeups) break ;                 // previous semantics
never@3156:     if (status == ETIMEDOUT) break ;
never@3156:     // We consume and ignore EINTR and spurious wakeups.
never@3156:   }
never@3156:   --_nParked ;
never@3156:   if (_Event >= 0) {
never@3156:      ret = OS_OK;
never@3156:   }
never@3156:   _Event = 0 ;
never@3156:   status = pthread_mutex_unlock(_mutex);
never@3156:   assert_status(status == 0, status, "mutex_unlock");
never@3156:   assert (_nParked == 0, "invariant") ;
dcubed@4471:   // Paranoia to ensure our locked and lock-free paths interact
dcubed@4471:   // correctly with each other.
dcubed@4471:   OrderAccess::fence();
never@3156:   return ret;
never@3156: }
never@3156: 
never@3156: void os::PlatformEvent::unpark() {
dcubed@4471:   // Transitions for _Event:
dcubed@4471:   //    0 :=> 1
dcubed@4471:   //    1 :=> 1
dcubed@4471:   //   -1 :=> either 0 or 1; must signal target thread
dcubed@4471:   //          That is, we can safely transition _Event from -1 to either
dcubed@4471:   //          0 or 1. Forcing 1 is slightly more efficient for back-to-back
dcubed@4471:   //          unpark() calls.
dcubed@4471:   // See also: "Semaphores in Plan 9" by Mullender & Cox
dcubed@4471:   //
dcubed@4471:   // Note: Forcing a transition from "-1" to "1" on an unpark() means
dcubed@4471:   // that it will take two back-to-back park() calls for the owning
dcubed@4471:   // thread to block. This has the benefit of forcing a spurious return
dcubed@4471:   // from the first park() call after an unpark() call which will help
dcubed@4471:   // shake out uses of park() and unpark() without condition variables.
dcubed@4471: 
dcubed@4471:   if (Atomic::xchg(1, &_Event) >= 0) return;
dcubed@4471: 
dcubed@4471:   // Wait for the thread associated with the event to vacate
dcubed@4471:   int status = pthread_mutex_lock(_mutex);
dcubed@4471:   assert_status(status == 0, status, "mutex_lock");
dcubed@4471:   int AnyWaiters = _nParked;
dcubed@4471:   assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
dcubed@4471:   if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) {
dcubed@4471:     AnyWaiters = 0;
dcubed@4471:     pthread_cond_signal(_cond);
never@3156:   }
dcubed@4471:   status = pthread_mutex_unlock(_mutex);
dcubed@4471:   assert_status(status == 0, status, "mutex_unlock");
dcubed@4471:   if (AnyWaiters != 0) {
dcubed@4471:     status = pthread_cond_signal(_cond);
dcubed@4471:     assert_status(status == 0, status, "cond_signal");
never@3156:   }
never@3156: 
never@3156:   // Note that we signal() _after dropping the lock for "immortal" Events.
never@3156:   // This is safe and avoids a common class of  futile wakeups.  In rare
never@3156:   // circumstances this can cause a thread to return prematurely from
never@3156:   // cond_{timed}wait() but the spurious wakeup is benign and the victim will
never@3156:   // simply re-test the condition and re-park itself.
never@3156: }
never@3156: 
never@3156: 
never@3156: // JSR166
never@3156: // -------------------------------------------------------
never@3156: 
never@3156: /*
never@3156:  * The solaris and bsd implementations of park/unpark are fairly
never@3156:  * conservative for now, but can be improved. They currently use a
never@3156:  * mutex/condvar pair, plus a a count.
never@3156:  * Park decrements count if > 0, else does a condvar wait.  Unpark
never@3156:  * sets count to 1 and signals condvar.  Only one thread ever waits
never@3156:  * on the condvar. Contention seen when trying to park implies that someone
never@3156:  * is unparking you, so don't wait. And spurious returns are fine, so there
never@3156:  * is no need to track notifications.
never@3156:  */
never@3156: 
never@3156: #define MAX_SECS 100000000
never@3156: /*
never@3156:  * This code is common to bsd and solaris and will be moved to a
never@3156:  * common place in dolphin.
never@3156:  *
never@3156:  * The passed in time value is either a relative time in nanoseconds
never@3156:  * or an absolute time in milliseconds. Either way it has to be unpacked
never@3156:  * into suitable seconds and nanoseconds components and stored in the
never@3156:  * given timespec structure.
never@3156:  * Given time is a 64-bit value and the time_t used in the timespec is only
never@3156:  * a signed-32-bit value (except on 64-bit Bsd) we have to watch for
never@3156:  * overflow if times way in the future are given. Further on Solaris versions
never@3156:  * prior to 10 there is a restriction (see cond_timedwait) that the specified
never@3156:  * number of seconds, in abstime, is less than current_time  + 100,000,000.
never@3156:  * As it will be 28 years before "now + 100000000" will overflow we can
never@3156:  * ignore overflow and just impose a hard-limit on seconds using the value
never@3156:  * of "now + 100,000,000". This places a limit on the timeout of about 3.17
never@3156:  * years from "now".
never@3156:  */
never@3156: 
never@3156: static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) {
never@3156:   assert (time > 0, "convertTime");
never@3156: 
never@3156:   struct timeval now;
never@3156:   int status = gettimeofday(&now, NULL);
never@3156:   assert(status == 0, "gettimeofday");
never@3156: 
never@3156:   time_t max_secs = now.tv_sec + MAX_SECS;
never@3156: 
never@3156:   if (isAbsolute) {
never@3156:     jlong secs = time / 1000;
never@3156:     if (secs > max_secs) {
never@3156:       absTime->tv_sec = max_secs;
never@3156:     }
never@3156:     else {
never@3156:       absTime->tv_sec = secs;
never@3156:     }
never@3156:     absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
never@3156:   }
never@3156:   else {
never@3156:     jlong secs = time / NANOSECS_PER_SEC;
never@3156:     if (secs >= MAX_SECS) {
never@3156:       absTime->tv_sec = max_secs;
never@3156:       absTime->tv_nsec = 0;
never@3156:     }
never@3156:     else {
never@3156:       absTime->tv_sec = now.tv_sec + secs;
never@3156:       absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
never@3156:       if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
never@3156:         absTime->tv_nsec -= NANOSECS_PER_SEC;
never@3156:         ++absTime->tv_sec; // note: this must be <= max_secs
never@3156:       }
never@3156:     }
never@3156:   }
never@3156:   assert(absTime->tv_sec >= 0, "tv_sec < 0");
never@3156:   assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
never@3156:   assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
never@3156:   assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
never@3156: }
never@3156: 
never@3156: void Parker::park(bool isAbsolute, jlong time) {
dcubed@4471:   // Ideally we'd do something useful while spinning, such
dcubed@4471:   // as calling unpackTime().
dcubed@4471: 
never@3156:   // Optional fast-path check:
never@3156:   // Return immediately if a permit is available.
dcubed@4471:   // We depend on Atomic::xchg() having full barrier semantics
dcubed@4471:   // since we are doing a lock-free update to _counter.
dcubed@4471:   if (Atomic::xchg(0, &_counter) > 0) return;
never@3156: 
never@3156:   Thread* thread = Thread::current();
never@3156:   assert(thread->is_Java_thread(), "Must be JavaThread");
never@3156:   JavaThread *jt = (JavaThread *)thread;
never@3156: 
never@3156:   // Optional optimization -- avoid state transitions if there's an interrupt pending.
never@3156:   // Check interrupt before trying to wait
never@3156:   if (Thread::is_interrupted(thread, false)) {
never@3156:     return;
never@3156:   }
never@3156: 
never@3156:   // Next, demultiplex/decode time arguments
never@3156:   struct timespec absTime;
never@3156:   if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
never@3156:     return;
never@3156:   }
never@3156:   if (time > 0) {
never@3156:     unpackTime(&absTime, isAbsolute, time);
never@3156:   }
never@3156: 
never@3156: 
never@3156:   // Enter safepoint region
never@3156:   // Beware of deadlocks such as 6317397.
never@3156:   // The per-thread Parker:: mutex is a classic leaf-lock.
never@3156:   // In particular a thread must never block on the Threads_lock while
never@3156:   // holding the Parker:: mutex.  If safepoints are pending both the
never@3156:   // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
never@3156:   ThreadBlockInVM tbivm(jt);
never@3156: 
never@3156:   // Don't wait if cannot get lock since interference arises from
never@3156:   // unblocking.  Also. check interrupt before trying wait
never@3156:   if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
never@3156:     return;
never@3156:   }
never@3156: 
never@3156:   int status ;
never@3156:   if (_counter > 0)  { // no wait needed
never@3156:     _counter = 0;
never@3156:     status = pthread_mutex_unlock(_mutex);
never@3156:     assert (status == 0, "invariant") ;
dcubed@4471:     // Paranoia to ensure our locked and lock-free paths interact
dcubed@4471:     // correctly with each other and Java-level accesses.
never@3156:     OrderAccess::fence();
never@3156:     return;
never@3156:   }
never@3156: 
never@3156: #ifdef ASSERT
never@3156:   // Don't catch signals while blocked; let the running threads have the signals.
never@3156:   // (This allows a debugger to break into the running thread.)
never@3156:   sigset_t oldsigs;
never@3156:   sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals();
never@3156:   pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
never@3156: #endif
never@3156: 
never@3156:   OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
never@3156:   jt->set_suspend_equivalent();
never@3156:   // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
never@3156: 
never@3156:   if (time == 0) {
never@3156:     status = pthread_cond_wait (_cond, _mutex) ;
never@3156:   } else {
never@3156:     status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ;
never@3156:     if (status != 0 && WorkAroundNPTLTimedWaitHang) {
never@3156:       pthread_cond_destroy (_cond) ;
never@3156:       pthread_cond_init    (_cond, NULL);
never@3156:     }
never@3156:   }
never@3156:   assert_status(status == 0 || status == EINTR ||
never@3156:                 status == ETIMEDOUT,
never@3156:                 status, "cond_timedwait");
never@3156: 
never@3156: #ifdef ASSERT
never@3156:   pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
never@3156: #endif
never@3156: 
never@3156:   _counter = 0 ;
never@3156:   status = pthread_mutex_unlock(_mutex) ;
never@3156:   assert_status(status == 0, status, "invariant") ;
dcubed@4471:   // Paranoia to ensure our locked and lock-free paths interact
dcubed@4471:   // correctly with each other and Java-level accesses.
dcubed@4471:   OrderAccess::fence();
dcubed@4471: 
never@3156:   // If externally suspended while waiting, re-suspend
never@3156:   if (jt->handle_special_suspend_equivalent_condition()) {
never@3156:     jt->java_suspend_self();
never@3156:   }
never@3156: }
never@3156: 
never@3156: void Parker::unpark() {
never@3156:   int s, status ;
never@3156:   status = pthread_mutex_lock(_mutex);
never@3156:   assert (status == 0, "invariant") ;
never@3156:   s = _counter;
never@3156:   _counter = 1;
never@3156:   if (s < 1) {
never@3156:      if (WorkAroundNPTLTimedWaitHang) {
never@3156:         status = pthread_cond_signal (_cond) ;
never@3156:         assert (status == 0, "invariant") ;
never@3156:         status = pthread_mutex_unlock(_mutex);
never@3156:         assert (status == 0, "invariant") ;
never@3156:      } else {
never@3156:         status = pthread_mutex_unlock(_mutex);
never@3156:         assert (status == 0, "invariant") ;
never@3156:         status = pthread_cond_signal (_cond) ;
never@3156:         assert (status == 0, "invariant") ;
never@3156:      }
never@3156:   } else {
never@3156:     pthread_mutex_unlock(_mutex);
never@3156:     assert (status == 0, "invariant") ;
never@3156:   }
never@3156: }
never@3156: 
never@3156: 
never@3156: /* Darwin has no "environ" in a dynamic library. */
never@3156: #ifdef __APPLE__
never@3156: #include <crt_externs.h>
never@3156: #define environ (*_NSGetEnviron())
never@3156: #else
never@3156: extern char** environ;
never@3156: #endif
never@3156: 
never@3156: // Run the specified command in a separate process. Return its exit value,
never@3156: // or -1 on failure (e.g. can't fork a new process).
never@3156: // Unlike system(), this function can be called from signal handler. It
never@3156: // doesn't block SIGINT et al.
never@3156: int os::fork_and_exec(char* cmd) {
never@3156:   const char * argv[4] = {"sh", "-c", cmd, NULL};
never@3156: 
never@3156:   // fork() in BsdThreads/NPTL is not async-safe. It needs to run
never@3156:   // pthread_atfork handlers and reset pthread library. All we need is a
never@3156:   // separate process to execve. Make a direct syscall to fork process.
never@3156:   // On IA64 there's no fork syscall, we have to use fork() and hope for
never@3156:   // the best...
never@3156:   pid_t pid = fork();
never@3156: 
never@3156:   if (pid < 0) {
never@3156:     // fork failed
never@3156:     return -1;
never@3156: 
never@3156:   } else if (pid == 0) {
never@3156:     // child process
never@3156: 
never@3156:     // execve() in BsdThreads will call pthread_kill_other_threads_np()
never@3156:     // first to kill every thread on the thread list. Because this list is
never@3156:     // not reset by fork() (see notes above), execve() will instead kill
never@3156:     // every thread in the parent process. We know this is the only thread
never@3156:     // in the new process, so make a system call directly.
never@3156:     // IA64 should use normal execve() from glibc to match the glibc fork()
never@3156:     // above.
never@3156:     execve("/bin/sh", (char* const*)argv, environ);
never@3156: 
never@3156:     // execve failed
never@3156:     _exit(-1);
never@3156: 
never@3156:   } else  {
never@3156:     // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
never@3156:     // care about the actual exit code, for now.
never@3156: 
never@3156:     int status;
never@3156: 
never@3156:     // Wait for the child process to exit.  This returns immediately if
never@3156:     // the child has already exited. */
never@3156:     while (waitpid(pid, &status, 0) < 0) {
never@3156:         switch (errno) {
never@3156:         case ECHILD: return 0;
never@3156:         case EINTR: break;
never@3156:         default: return -1;
never@3156:         }
never@3156:     }
never@3156: 
never@3156:     if (WIFEXITED(status)) {
never@3156:        // The child exited normally; get its exit code.
never@3156:        return WEXITSTATUS(status);
never@3156:     } else if (WIFSIGNALED(status)) {
never@3156:        // The child exited because of a signal
never@3156:        // The best value to return is 0x80 + signal number,
never@3156:        // because that is what all Unix shells do, and because
never@3156:        // it allows callers to distinguish between process exit and
never@3156:        // process death by signal.
never@3156:        return 0x80 + WTERMSIG(status);
never@3156:     } else {
never@3156:        // Unknown exit code; pass it through
never@3156:        return status;
never@3156:     }
never@3156:   }
never@3156: }
never@3156: 
never@3156: // is_headless_jre()
never@3156: //
dholmes@3281: // Test for the existence of xawt/libmawt.so or libawt_xawt.so
never@3156: // in order to report if we are running in a headless jre
never@3156: //
dholmes@3281: // Since JDK8 xawt/libmawt.so was moved into the same directory
dholmes@3281: // as libawt.so, and renamed libawt_xawt.so
dholmes@3281: //
never@3156: bool os::is_headless_jre() {
never@3156:     struct stat statbuf;
never@3156:     char buf[MAXPATHLEN];
never@3156:     char libmawtpath[MAXPATHLEN];
dcubed@3202:     const char *xawtstr  = "/xawt/libmawt" JNI_LIB_SUFFIX;
dcubed@3625:     const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX;
never@3156:     char *p;
never@3156: 
never@3156:     // Get path to libjvm.so
never@3156:     os::jvm_path(buf, sizeof(buf));
never@3156: 
never@3156:     // Get rid of libjvm.so
never@3156:     p = strrchr(buf, '/');
never@3156:     if (p == NULL) return false;
never@3156:     else *p = '\0';
never@3156: 
never@3156:     // Get rid of client or server
never@3156:     p = strrchr(buf, '/');
never@3156:     if (p == NULL) return false;
never@3156:     else *p = '\0';
never@3156: 
never@3156:     // check xawt/libmawt.so
never@3156:     strcpy(libmawtpath, buf);
never@3156:     strcat(libmawtpath, xawtstr);
never@3156:     if (::stat(libmawtpath, &statbuf) == 0) return false;
never@3156: 
dholmes@3281:     // check libawt_xawt.so
never@3156:     strcpy(libmawtpath, buf);
dholmes@3281:     strcat(libmawtpath, new_xawtstr);
never@3156:     if (::stat(libmawtpath, &statbuf) == 0) return false;
never@3156: 
never@3156:     return true;
never@3156: }
mikael@3903: 
mikael@3903: // Get the default path to the core file
mikael@3903: // Returns the length of the string
mikael@3903: int os::get_core_path(char* buffer, size_t bufferSize) {
mikael@3903:   int n = jio_snprintf(buffer, bufferSize, "/cores");
mikael@3903: 
mikael@3903:   // Truncate if theoretical string was longer than bufferSize
mikael@3903:   n = MIN2(n, (int)bufferSize);
mikael@3903: 
mikael@3903:   return n;
mikael@3903: }