jdk8-mips64-public/hotspot: src/os/aix/vm/os_aix.hpp@f90c822e73f8 (annotated)

src/os/aix/vm/os_aix.hpp@f90c822e73f8 (annotated)

src/os/aix/vm/os_aix.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 7424: c5e86c5cd22e
permissions: -rw-r--r--

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

 /*
  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
  * Copyright 2013 SAP AG. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef OS_AIX_VM_OS_AIX_HPP
 #define OS_AIX_VM_OS_AIX_HPP
 // Information about the protection of the page at address '0' on this os.
 static bool zero_page_read_protected() { return false; }
 // Class Aix defines the interface to the Aix operating systems.
 class Aix {
   friend class os;
   // For signal-chaining
   // highest so far (AIX 5.2) is SIGSAK (63)
 #define MAXSIGNUM 63
   // length of strings included in the libperfstat structures
 #define IDENTIFIER_LENGTH 64
   static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
   static unsigned int sigs;             // mask of signals that have
                                         // preinstalled signal handlers
   static bool libjsig_is_loaded;        // libjsig that interposes sigaction(),
                                         // __sigaction(), signal() is loaded
   static struct sigaction *(*get_signal_action)(int);
   static struct sigaction *get_preinstalled_handler(int);
   static void save_preinstalled_handler(int, struct sigaction&);
   static void check_signal_handler(int sig);
   // For signal flags diagnostics
   static int sigflags[MAXSIGNUM];
  protected:
   static julong _physical_memory;
   static pthread_t _main_thread;
   static Mutex* _createThread_lock;
   static int _page_size;
   static int _logical_cpus;
   // -1 = uninitialized, 0 = AIX, 1 = OS/400 (PASE)
   static int _on_pase;
   // -1 = uninitialized, otherwise 16 bit number:
   //  lower 8 bit - minor version
   //  higher 8 bit - major version
   //  For AIX, e.g. 0x0601 for AIX 6.1
   //  for OS/400 e.g. 0x0504 for OS/400 V5R4
   static int _os_version;
   // -1 = uninitialized,
   //  0 - SPEC1170 not requested (XPG_SUS_ENV is OFF or not set)
   //  1 - SPEC1170 requested (XPG_SUS_ENV is ON)
   static int _xpg_sus_mode;
   // -1 = uninitialized,
   //  0 - EXTSHM=OFF or not set
   //  1 - EXTSHM=ON
   static int _extshm;
   // page sizes on AIX.
   //
   //  AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The latter two
   //  (16M "large" resp. 16G "huge" pages) require special setup and are normally
   //  not available.
   //
   //  AIX supports multiple page sizes per process, for:
   //  - Stack (of the primordial thread, so not relevant for us)
   //  - Data - data, bss, heap, for us also pthread stacks
   //  - Text - text code
   //  - shared memory
   //
   //  Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
   //  and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...)
   //
   //  For shared memory, page size can be set dynamically via shmctl(). Different shared memory
   //  regions can have different page sizes.
   //
   //  More information can be found at AIBM info center:
   //   http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
   //
   // -----
   //  We want to support 4K and 64K and, if the machine is set up correctly, 16MB pages.
   //
   // page size of the stack of newly created pthreads
   // (should be LDR_CNTRL DATAPSIZE because stack is allocated on heap by pthread lib)
   static int _stack_page_size;
   // Default shm page size. Read: what page size shared memory will be backed
   // with if no page size was set explicitly using shmctl(SHM_PAGESIZE).
   // Should be LDR_CNTRL SHMPSIZE.
   static size_t _shm_default_page_size;
   // True if sys V shm can be used with 64K pages dynamically.
   // (via shmctl(.. SHM_PAGESIZE..). Should be true for AIX 53 and
   // newer / PASE V6R1 and newer. (0 or 1, -1 if not initialized)
   static int _can_use_64K_pages;
   // True if sys V shm can be used with 16M pages dynamically.
   // (via shmctl(.. SHM_PAGESIZE..). Only true on AIX 5.3 and
   // newer, if the system was set up to use 16M pages and the
   // jvm has enough user rights. (0 or 1, -1 if not initialized)
   static int _can_use_16M_pages;
   static julong available_memory();
   static julong physical_memory() { return _physical_memory; }
   static void initialize_system_info();
   // OS recognitions (PASE/AIX, OS level) call this before calling any
   // one of Aix::on_pase(), Aix::os_version().
   static void initialize_os_info();
   static int commit_memory_impl(char* addr, size_t bytes, bool exec);
   static int commit_memory_impl(char* addr, size_t bytes,
                                 size_t alignment_hint, bool exec);
   // Scan environment for important settings which might effect the
   // VM. Trace out settings. Warn about invalid settings and/or
   // correct them.
   //
   // Must run after os::Aix::initialue_os_info().
   static void scan_environment();
   // Retrieve information about multipage size support. Will initialize
   // _page_size, _stack_page_size, _can_use_64K_pages/_can_use_16M_pages
   static void query_multipage_support();
   // Initialize libo4 (on PASE) and libperfstat (on AIX). Call this
   // before relying on functions from either lib, e.g. Aix::get_meminfo().
   static void initialize_libo4();
   static void initialize_libperfstat();
   static bool supports_variable_stack_size();
  public:
   static void init_thread_fpu_state();
   static pthread_t main_thread(void)                                { return _main_thread; }
   // returns kernel thread id (similar to LWP id on Solaris), which can be
   // used to access /proc
   static pid_t gettid();
   static void set_createThread_lock(Mutex* lk)                      { _createThread_lock = lk; }
   static Mutex* createThread_lock(void)                             { return _createThread_lock; }
   static void hotspot_sigmask(Thread* thread);
   // Given an address, returns the size of the page backing that address
   static size_t query_pagesize(void* p);
   // Return `true' if the calling thread is the primordial thread. The
   // primordial thread is the thread which contains the main function,
   // *not* necessarily the thread which initialized the VM by calling
   // JNI_CreateJavaVM.
   static bool is_primordial_thread(void);
   static int page_size(void) {
     assert(_page_size != -1, "not initialized");
     return _page_size;
   }
   // Accessor methods for stack page size which may be different from usual page size.
   static int stack_page_size(void) {
     assert(_stack_page_size != -1, "not initialized");
     return _stack_page_size;
   }
   // default shm page size. Read: what page size shared memory
   // will be backed with if no page size was set explicitly using shmctl(SHM_PAGESIZE).
   // Should be LDR_CNTRL SHMPSIZE.
   static int shm_default_page_size(void) {
     assert(_shm_default_page_size != -1, "not initialized");
     return _shm_default_page_size;
   }
   // Return true if sys V shm can be used with 64K pages dynamically
   // (via shmctl(.. SHM_PAGESIZE..).
   static bool can_use_64K_pages () {
     assert(_can_use_64K_pages != -1,  "not initialized");
     return _can_use_64K_pages == 1 ? true : false;
   }
   // Return true if sys V shm can be used with 16M pages dynamically.
   // (via shmctl(.. SHM_PAGESIZE..).
   static bool can_use_16M_pages () {
     assert(_can_use_16M_pages != -1,  "not initialized");
     return _can_use_16M_pages == 1 ? true : false;
   }
   static address   ucontext_get_pc(ucontext_t* uc);
   static intptr_t* ucontext_get_sp(ucontext_t* uc);
   static intptr_t* ucontext_get_fp(ucontext_t* uc);
   // Set PC into context. Needed for continuation after signal.
   static void ucontext_set_pc(ucontext_t* uc, address pc);
   // This boolean allows users to forward their own non-matching signals
   // to JVM_handle_aix_signal, harmlessly.
   static bool signal_handlers_are_installed;
   static int get_our_sigflags(int);
   static void set_our_sigflags(int, int);
   static void signal_sets_init();
   static void install_signal_handlers();
   static void set_signal_handler(int, bool);
   static bool is_sig_ignored(int sig);
   static sigset_t* unblocked_signals();
   static sigset_t* vm_signals();
   static sigset_t* allowdebug_blocked_signals();
   // For signal-chaining
   static struct sigaction *get_chained_signal_action(int sig);
   static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
   // libpthread version string
   static void libpthread_init();
   // Minimum stack size a thread can be created with (allowing
   // the VM to completely create the thread and enter user code)
   static size_t min_stack_allowed;
   // Return default stack size or guard size for the specified thread type
   static size_t default_stack_size(os::ThreadType thr_type);
   static size_t default_guard_size(os::ThreadType thr_type);
   // Function returns true if we run on OS/400 (pase), false if we run
   // on AIX.
   static bool on_pase() {
     assert(_on_pase != -1, "not initialized");
     return _on_pase ? true : false;
   }
   // Function returns true if we run on AIX, false if we run on OS/400
   // (pase).
   static bool on_aix() {
     assert(_on_pase != -1, "not initialized");
     return _on_pase ? false : true;
   }
   // -1 = uninitialized, otherwise 16 bit number:
   // lower 8 bit - minor version
   // higher 8 bit - major version
   // For AIX, e.g. 0x0601 for AIX 6.1
   // for OS/400 e.g. 0x0504 for OS/400 V5R4
   static int os_version () {
     assert(_os_version != -1, "not initialized");
     return _os_version;
   }
   // Convenience method: returns true if running on AIX 5.3 or older.
   static bool on_aix_53_or_older() {
     return on_aix() && os_version() <= 0x0503;
   }
   // Returns true if we run in SPEC1170 compliant mode (XPG_SUS_ENV=ON).
   static bool xpg_sus_mode() {
     assert(_xpg_sus_mode != -1, "not initialized");
     return _xpg_sus_mode;
   }
   // Returns true if EXTSHM=ON.
   static bool extshm() {
     assert(_extshm != -1, "not initialized");
     return _extshm;
   }
   // result struct for get_meminfo()
   struct meminfo_t {
     // Amount of virtual memory (in units of 4 KB pages)
     unsigned long long virt_total;
     // Amount of real memory, in bytes
     unsigned long long real_total;
     // Amount of free real memory, in bytes
     unsigned long long real_free;
     // Total amount of paging space, in bytes
     unsigned long long pgsp_total;
     // Amount of free paging space, in bytes
     unsigned long long pgsp_free;
   };
   // Result struct for get_cpuinfo().
   struct cpuinfo_t {
     char description[IDENTIFIER_LENGTH];  // processor description (type/official name)
     u_longlong_t processorHZ;             // processor speed in Hz
     int ncpus;                            // number of active logical processors
     double loadavg[3];                    // (1<<SBITS) times the average number of runnables processes during the last 1, 5 and 15 minutes.
                                           // To calculate the load average, divide the numbers by (1<<SBITS). SBITS is defined in <sys/proc.h>.
     char version[20];                     // processor version from _system_configuration (sys/systemcfg.h)
   };
   // Functions to retrieve memory information on AIX, PASE.
   // (on AIX, using libperfstat, on PASE with libo4.so).
   // Returns true if ok, false if error.
   static bool get_meminfo(meminfo_t* pmi);
   // Function to retrieve cpu information on AIX
   // (on AIX, using libperfstat)
   // Returns true if ok, false if error.
   static bool get_cpuinfo(cpuinfo_t* pci);
 }; // os::Aix class
 class PlatformEvent : public CHeapObj<mtInternal> {
   private:
     double CachePad [4];   // increase odds that _mutex is sole occupant of cache line
     volatile int _Event;
     volatile int _nParked;
     pthread_mutex_t _mutex  [1];
     pthread_cond_t  _cond   [1];
     double PostPad  [2];
     Thread * _Assoc;
   public:       // TODO-FIXME: make dtor private
     ~PlatformEvent() { guarantee (0, "invariant"); }
   public:
     PlatformEvent() {
       int status;
       status = pthread_cond_init (_cond, NULL);
       assert_status(status == 0, status, "cond_init");
       status = pthread_mutex_init (_mutex, NULL);
       assert_status(status == 0, status, "mutex_init");
       _Event   = 0;
       _nParked = 0;
       _Assoc   = NULL;
     }
     // Use caution with reset() and fired() -- they may require MEMBARs
     void reset() { _Event = 0; }
     int  fired() { return _Event; }
     void park ();
     void unpark ();
     int  TryPark ();
     int  park (jlong millis);
     void SetAssociation (Thread * a) { _Assoc = a; }
 };
 class PlatformParker : public CHeapObj<mtInternal> {
   protected:
     pthread_mutex_t _mutex [1];
     pthread_cond_t  _cond  [1];
   public:       // TODO-FIXME: make dtor private
     ~PlatformParker() { guarantee (0, "invariant"); }
   public:
     PlatformParker() {
       int status;
       status = pthread_cond_init (_cond, NULL);
       assert_status(status == 0, status, "cond_init");
       status = pthread_mutex_init (_mutex, NULL);
       assert_status(status == 0, status, "mutex_init");
     }
 };
 #endif // OS_AIX_VM_OS_AIX_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/os/aix/vm/os_aix.hpp@f90c822e73f8 (annotated)

src/os/aix/vm/os_aix.hpp