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Java example source code file (mutexLocker.cpp)

This example Java source code file (mutexLocker.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

include_trace, jnihandleblockfreelist_lock, max_num_mutex, monitor, mutex, null, safepointsynchronize\:\:is_at_safepoint, symboltable_lock, useconcmarksweepgc, used, useg1gc, vm_operation

The mutexLocker.cpp Java example source code

/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. 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.
 *
 */

#include "precompiled.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/safepoint.hpp"
#include "runtime/thread.inline.hpp"
#include "runtime/threadLocalStorage.hpp"
#include "runtime/vmThread.hpp"

// Mutexes used in the VM (see comment in mutexLocker.hpp):
//
// Note that the following pointers are effectively final -- after having been
// set at JVM startup-time, they should never be subsequently mutated.
// Instead of using pointers to malloc()ed monitors and mutexes we should consider
// eliminating the indirection and using instances instead.
// Consider using GCC's __read_mostly.

Mutex*   Patching_lock                = NULL;
Monitor* SystemDictionary_lock        = NULL;
Mutex*   PackageTable_lock            = NULL;
Mutex*   CompiledIC_lock              = NULL;
Mutex*   InlineCacheBuffer_lock       = NULL;
Mutex*   VMStatistic_lock             = NULL;
Mutex*   JNIGlobalHandle_lock         = NULL;
Mutex*   JNIHandleBlockFreeList_lock  = NULL;
Mutex*   MemberNameTable_lock         = NULL;
Mutex*   JmethodIdCreation_lock       = NULL;
Mutex*   JfieldIdCreation_lock        = NULL;
Monitor* JNICritical_lock             = NULL;
Mutex*   JvmtiThreadState_lock        = NULL;
Monitor* JvmtiPendingEvent_lock       = NULL;
Monitor* Heap_lock                    = NULL;
Mutex*   ExpandHeap_lock              = NULL;
Mutex*   AdapterHandlerLibrary_lock   = NULL;
Mutex*   SignatureHandlerLibrary_lock = NULL;
Mutex*   VtableStubs_lock             = NULL;
Mutex*   SymbolTable_lock             = NULL;
Mutex*   StringTable_lock             = NULL;
Mutex*   CodeCache_lock               = NULL;
Mutex*   MethodData_lock              = NULL;
Mutex*   RetData_lock                 = NULL;
Monitor* VMOperationQueue_lock        = NULL;
Monitor* VMOperationRequest_lock      = NULL;
Monitor* Safepoint_lock               = NULL;
Monitor* SerializePage_lock           = NULL;
Monitor* Threads_lock                 = NULL;
Monitor* CGC_lock                     = NULL;
Mutex*   STS_init_lock                = NULL;
Monitor* SLT_lock                     = NULL;
Monitor* iCMS_lock                    = NULL;
Monitor* FullGCCount_lock             = NULL;
Monitor* CMark_lock                   = NULL;
Mutex*   CMRegionStack_lock           = NULL;
Mutex*   SATB_Q_FL_lock               = NULL;
Monitor* SATB_Q_CBL_mon               = NULL;
Mutex*   Shared_SATB_Q_lock           = NULL;
Mutex*   DirtyCardQ_FL_lock           = NULL;
Monitor* DirtyCardQ_CBL_mon           = NULL;
Mutex*   Shared_DirtyCardQ_lock       = NULL;
Mutex*   ParGCRareEvent_lock          = NULL;
Mutex*   EvacFailureStack_lock        = NULL;
Mutex*   DerivedPointerTableGC_lock   = NULL;
Mutex*   Compile_lock                 = NULL;
Monitor* MethodCompileQueue_lock      = NULL;
Monitor* CompileThread_lock           = NULL;
Mutex*   CompileTaskAlloc_lock        = NULL;
Mutex*   CompileStatistics_lock       = NULL;
Mutex*   MultiArray_lock              = NULL;
Monitor* Terminator_lock              = NULL;
Monitor* BeforeExit_lock              = NULL;
Monitor* Notify_lock                  = NULL;
Monitor* Interrupt_lock               = NULL;
Monitor* ProfileVM_lock               = NULL;
Mutex*   ProfilePrint_lock            = NULL;
Mutex*   ExceptionCache_lock          = NULL;
Monitor* ObjAllocPost_lock            = NULL;
Mutex*   OsrList_lock                 = NULL;
#ifndef PRODUCT
Mutex*   FullGCALot_lock              = NULL;
#endif

Mutex*   Debug1_lock                  = NULL;
Mutex*   Debug2_lock                  = NULL;
Mutex*   Debug3_lock                  = NULL;

Mutex*   tty_lock                     = NULL;

Mutex*   RawMonitor_lock              = NULL;
Mutex*   PerfDataMemAlloc_lock        = NULL;
Mutex*   PerfDataManager_lock         = NULL;
Mutex*   OopMapCacheAlloc_lock        = NULL;

Mutex*   FreeList_lock                = NULL;
Monitor* SecondaryFreeList_lock       = NULL;
Mutex*   OldSets_lock                 = NULL;
Monitor* RootRegionScan_lock          = NULL;
Mutex*   MMUTracker_lock              = NULL;
Mutex*   HotCardCache_lock            = NULL;

Monitor* GCTaskManager_lock           = NULL;

Mutex*   Management_lock              = NULL;
Monitor* Service_lock                 = NULL;
Monitor* PeriodicTask_lock            = NULL;

#ifdef INCLUDE_TRACE
Mutex*   JfrStacktrace_lock           = NULL;
Monitor* JfrMsg_lock                  = NULL;
Mutex*   JfrBuffer_lock               = NULL;
Mutex*   JfrStream_lock               = NULL;
Mutex*   JfrThreadGroups_lock         = NULL;
#endif

#define MAX_NUM_MUTEX 128
static Monitor * _mutex_array[MAX_NUM_MUTEX];
static int _num_mutex;

#ifdef ASSERT
void assert_locked_or_safepoint(const Monitor * lock) {
  // check if this thread owns the lock (common case)
  if (IgnoreLockingAssertions) return;
  assert(lock != NULL, "Need non-NULL lock");
  if (lock->owned_by_self()) return;
  if (SafepointSynchronize::is_at_safepoint()) return;
  if (!Universe::is_fully_initialized()) return;
  // see if invoker of VM operation owns it
  VM_Operation* op = VMThread::vm_operation();
  if (op != NULL && op->calling_thread() == lock->owner()) return;
  fatal(err_msg("must own lock %s", lock->name()));
}

// a stronger assertion than the above
void assert_lock_strong(const Monitor * lock) {
  if (IgnoreLockingAssertions) return;
  assert(lock != NULL, "Need non-NULL lock");
  if (lock->owned_by_self()) return;
  fatal(err_msg("must own lock %s", lock->name()));
}
#endif

#define def(var, type, pri, vm_block) {                           \
  var = new type(Mutex::pri, #var, vm_block);                     \
  assert(_num_mutex < MAX_NUM_MUTEX,                              \
                    "increase MAX_NUM_MUTEX");                    \
  _mutex_array[_num_mutex++] = var;                               \
}

void mutex_init() {
  def(tty_lock                     , Mutex  , event,       true ); // allow to lock in VM

  def(CGC_lock                   , Monitor, special,     true ); // coordinate between fore- and background GC
  def(STS_init_lock              , Mutex,   leaf,        true );
  if (UseConcMarkSweepGC) {
    def(iCMS_lock                  , Monitor, special,     true ); // CMS incremental mode start/stop notification
  }
  if (UseConcMarkSweepGC || UseG1GC) {
    def(FullGCCount_lock           , Monitor, leaf,        true ); // in support of ExplicitGCInvokesConcurrent
  }
  if (UseG1GC) {
    def(CMark_lock                 , Monitor, nonleaf,     true ); // coordinate concurrent mark thread
    def(CMRegionStack_lock         , Mutex,   leaf,        true );
    def(SATB_Q_FL_lock             , Mutex  , special,     true );
    def(SATB_Q_CBL_mon             , Monitor, nonleaf,     true );
    def(Shared_SATB_Q_lock         , Mutex,   nonleaf,     true );

    def(DirtyCardQ_FL_lock         , Mutex  , special,     true );
    def(DirtyCardQ_CBL_mon         , Monitor, nonleaf,     true );
    def(Shared_DirtyCardQ_lock     , Mutex,   nonleaf,     true );

    def(FreeList_lock              , Mutex,   leaf     ,   true );
    def(SecondaryFreeList_lock     , Monitor, leaf     ,   true );
    def(OldSets_lock               , Mutex  , leaf     ,   true );
    def(RootRegionScan_lock        , Monitor, leaf     ,   true );
    def(MMUTracker_lock            , Mutex  , leaf     ,   true );
    def(HotCardCache_lock          , Mutex  , special  ,   true );
    def(EvacFailureStack_lock      , Mutex  , nonleaf  ,   true );
  }
  def(ParGCRareEvent_lock          , Mutex  , leaf     ,   true );
  def(DerivedPointerTableGC_lock   , Mutex,   leaf,        true );
  def(CodeCache_lock               , Mutex  , special,     true );
  def(Interrupt_lock               , Monitor, special,     true ); // used for interrupt processing
  def(RawMonitor_lock              , Mutex,   special,     true );
  def(OopMapCacheAlloc_lock        , Mutex,   leaf,        true ); // used for oop_map_cache allocation.

  def(Patching_lock                , Mutex  , special,     true ); // used for safepointing and code patching.
  def(ObjAllocPost_lock            , Monitor, special,     false);
  def(Service_lock                 , Monitor, special,     true ); // used for service thread operations
  def(JmethodIdCreation_lock       , Mutex  , leaf,        true ); // used for creating jmethodIDs.

  def(SystemDictionary_lock        , Monitor, leaf,        true ); // lookups done by VM thread
  def(PackageTable_lock            , Mutex  , leaf,        false);
  def(InlineCacheBuffer_lock       , Mutex  , leaf,        true );
  def(VMStatistic_lock             , Mutex  , leaf,        false);
  def(ExpandHeap_lock              , Mutex  , leaf,        true ); // Used during compilation by VM thread
  def(JNIHandleBlockFreeList_lock  , Mutex  , leaf,        true ); // handles are used by VM thread
  def(SignatureHandlerLibrary_lock , Mutex  , leaf,        false);
  def(SymbolTable_lock             , Mutex  , leaf+2,      true );
  def(StringTable_lock             , Mutex  , leaf,        true );
  def(ProfilePrint_lock            , Mutex  , leaf,        false); // serial profile printing
  def(ExceptionCache_lock          , Mutex  , leaf,        false); // serial profile printing
  def(OsrList_lock                 , Mutex  , leaf,        true );
  def(Debug1_lock                  , Mutex  , leaf,        true );
#ifndef PRODUCT
  def(FullGCALot_lock              , Mutex  , leaf,        false); // a lock to make FullGCALot MT safe
#endif
  def(BeforeExit_lock              , Monitor, leaf,        true );
  def(PerfDataMemAlloc_lock        , Mutex  , leaf,        true ); // used for allocating PerfData memory for performance data
  def(PerfDataManager_lock         , Mutex  , leaf,        true ); // used for synchronized access to PerfDataManager resources

  // CMS_modUnionTable_lock                   leaf
  // CMS_bitMap_lock                          leaf + 1
  // CMS_freeList_lock                        leaf + 2

  def(Safepoint_lock               , Monitor, safepoint,   true ); // locks SnippetCache_lock/Threads_lock

  def(Threads_lock                 , Monitor, barrier,     true );

  def(VMOperationQueue_lock        , Monitor, nonleaf,     true ); // VM_thread allowed to block on these
  def(VMOperationRequest_lock      , Monitor, nonleaf,     true );
  def(RetData_lock                 , Mutex  , nonleaf,     false);
  def(Terminator_lock              , Monitor, nonleaf,     true );
  def(VtableStubs_lock             , Mutex  , nonleaf,     true );
  def(Notify_lock                  , Monitor, nonleaf,     true );
  def(JNIGlobalHandle_lock         , Mutex  , nonleaf,     true ); // locks JNIHandleBlockFreeList_lock
  def(JNICritical_lock             , Monitor, nonleaf,     true ); // used for JNI critical regions
  def(AdapterHandlerLibrary_lock   , Mutex  , nonleaf,     true);
  if (UseConcMarkSweepGC) {
    def(SLT_lock                   , Monitor, nonleaf,     false );
                    // used in CMS GC for locking PLL lock
  }
  def(Heap_lock                    , Monitor, nonleaf+1,   false);
  def(JfieldIdCreation_lock        , Mutex  , nonleaf+1,   true ); // jfieldID, Used in VM_Operation
  def(MemberNameTable_lock         , Mutex  , nonleaf+1,   false); // Used to protect MemberNameTable

  def(CompiledIC_lock              , Mutex  , nonleaf+2,   false); // locks VtableStubs_lock, InlineCacheBuffer_lock
  def(CompileTaskAlloc_lock        , Mutex  , nonleaf+2,   true );
  def(CompileStatistics_lock       , Mutex  , nonleaf+2,   false);
  def(MultiArray_lock              , Mutex  , nonleaf+2,   false); // locks SymbolTable_lock

  def(JvmtiThreadState_lock        , Mutex  , nonleaf+2,   false); // Used by JvmtiThreadState/JvmtiEventController
  def(JvmtiPendingEvent_lock       , Monitor, nonleaf,     false); // Used by JvmtiCodeBlobEvents
  def(Management_lock              , Mutex  , nonleaf+2,   false); // used for JVM management

  def(Compile_lock                 , Mutex  , nonleaf+3,   true );
  def(MethodData_lock              , Mutex  , nonleaf+3,   false);

  def(MethodCompileQueue_lock      , Monitor, nonleaf+4,   true );
  def(Debug2_lock                  , Mutex  , nonleaf+4,   true );
  def(Debug3_lock                  , Mutex  , nonleaf+4,   true );
  def(ProfileVM_lock               , Monitor, special,   false); // used for profiling of the VMThread
  def(CompileThread_lock           , Monitor, nonleaf+5,   false );
  def(PeriodicTask_lock            , Monitor, nonleaf+5,   true);

#ifdef INCLUDE_TRACE
  def(JfrMsg_lock                  , Monitor, leaf,        true);
  def(JfrBuffer_lock               , Mutex,   nonleaf+1,   true);
  def(JfrThreadGroups_lock         , Mutex,   nonleaf+1,   true);
  def(JfrStream_lock               , Mutex,   nonleaf+2,   true);
  def(JfrStacktrace_lock           , Mutex,   special,     true );
#endif

}

GCMutexLocker::GCMutexLocker(Monitor * mutex) {
  if (SafepointSynchronize::is_at_safepoint()) {
    _locked = false;
  } else {
    _mutex = mutex;
    _locked = true;
    _mutex->lock();
  }
}

// Print all mutexes/monitors that are currently owned by a thread; called
// by fatal error handler.
void print_owned_locks_on_error(outputStream* st) {
  st->print("VM Mutex/Monitor currently owned by a thread: ");
  bool none = true;
  for (int i = 0; i < _num_mutex; i++) {
     // see if it has an owner
     if (_mutex_array[i]->owner() != NULL) {
       if (none) {
          // print format used by Mutex::print_on_error()
          st->print_cr(" ([mutex/lock_event])");
          none = false;
       }
       _mutex_array[i]->print_on_error(st);
       st->cr();
     }
  }
  if (none) st->print_cr("None");
}

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