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1 /*
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2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // Mutexes used in the VM.
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26
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27 extern Mutex* Patching_lock; // a lock used to guard code patching of compiled code
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28 extern Monitor* SystemDictionary_lock; // a lock on the system dictonary
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29 extern Mutex* PackageTable_lock; // a lock on the class loader package table
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30 extern Mutex* CompiledIC_lock; // a lock used to guard compiled IC patching and access
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31 extern Mutex* InlineCacheBuffer_lock; // a lock used to guard the InlineCacheBuffer
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32 extern Mutex* VMStatistic_lock; // a lock used to guard statistics count increment
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33 extern Mutex* JNIGlobalHandle_lock; // a lock on creating JNI global handles
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34 extern Mutex* JNIHandleBlockFreeList_lock; // a lock on the JNI handle block free list
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35 extern Mutex* JNICachedItableIndex_lock; // a lock on caching an itable index during JNI invoke
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36 extern Mutex* JmethodIdCreation_lock; // a lock on creating JNI method identifiers
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37 extern Mutex* JfieldIdCreation_lock; // a lock on creating JNI static field identifiers
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38 extern Monitor* JNICritical_lock; // a lock used while entering and exiting JNI critical regions, allows GC to sometimes get in
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39 extern Mutex* JvmtiThreadState_lock; // a lock on modification of JVMTI thread data
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40 extern Monitor* JvmtiPendingEvent_lock; // a lock on the JVMTI pending events list
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41 extern Mutex* Heap_lock; // a lock on the heap
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42 extern Mutex* ExpandHeap_lock; // a lock on expanding the heap
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43 extern Mutex* AdapterHandlerLibrary_lock; // a lock on the AdapterHandlerLibrary
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44 extern Mutex* SignatureHandlerLibrary_lock; // a lock on the SignatureHandlerLibrary
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45 extern Mutex* VtableStubs_lock; // a lock on the VtableStubs
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46 extern Mutex* SymbolTable_lock; // a lock on the symbol table
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47 extern Mutex* StringTable_lock; // a lock on the interned string table
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48 extern Mutex* CodeCache_lock; // a lock on the CodeCache, rank is special, use MutexLockerEx
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49 extern Mutex* MethodData_lock; // a lock on installation of method data
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50 extern Mutex* RetData_lock; // a lock on installation of RetData inside method data
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51 extern Mutex* DerivedPointerTableGC_lock; // a lock to protect the derived pointer table
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52 extern Monitor* VMOperationQueue_lock; // a lock on queue of vm_operations waiting to execute
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53 extern Monitor* VMOperationRequest_lock; // a lock on Threads waiting for a vm_operation to terminate
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54 extern Monitor* Safepoint_lock; // a lock used by the safepoint abstraction
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55 extern Monitor* Threads_lock; // a lock on the Threads table of active Java threads
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56 // (also used by Safepoints too to block threads creation/destruction)
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57 extern Monitor* CGC_lock; // used for coordination between
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58 // fore- & background GC threads.
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59 extern Mutex* STS_init_lock; // coordinate initialization of SuspendibleThreadSets.
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60 extern Monitor* SLT_lock; // used in CMS GC for acquiring PLL
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61 extern Monitor* iCMS_lock; // CMS incremental mode start/stop notification
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62 extern Monitor* FullGCCount_lock; // in support of "concurrent" full gc
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63 // (see option ExplicitGCInvokesConcurrent)
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64 extern Mutex* ParGCRareEvent_lock; // Synchronizes various (rare) parallel GC ops.
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65 extern Mutex* Compile_lock; // a lock held when Compilation is updating code (used to block CodeCache traversal, CHA updates, etc)
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66 extern Monitor* MethodCompileQueue_lock; // a lock held when method compilations are enqueued, dequeued
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67 #ifdef TIERED
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68 extern Monitor* C1_lock; // a lock to ensure on single c1 compile is ever active
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69 #endif // TIERED
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70 extern Monitor* CompileThread_lock; // a lock held by compile threads during compilation system initialization
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71 extern Mutex* CompileTaskAlloc_lock; // a lock held when CompileTasks are allocated
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72 extern Mutex* CompileStatistics_lock; // a lock held when updating compilation statistics
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73 extern Mutex* MultiArray_lock; // a lock used to guard allocation of multi-dim arrays
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74 extern Monitor* Terminator_lock; // a lock used to guard termination of the vm
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75 extern Monitor* BeforeExit_lock; // a lock used to guard cleanups and shutdown hooks
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76 extern Monitor* Notify_lock; // a lock used to synchronize the start-up of the vm
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77 extern Monitor* Interrupt_lock; // a lock used for condition variable mediated interrupt processing
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78 extern Monitor* ProfileVM_lock; // a lock used for profiling the VMThread
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79 extern Mutex* ProfilePrint_lock; // a lock used to serialize the printing of profiles
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80 extern Mutex* ExceptionCache_lock; // a lock used to synchronize exception cache updates
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81 extern Mutex* OsrList_lock; // a lock used to serialize access to OSR queues
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82
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83 #ifndef PRODUCT
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84 extern Mutex* FullGCALot_lock; // a lock to make FullGCALot MT safe
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85 #endif
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86 extern Mutex* Debug1_lock; // A bunch of pre-allocated locks that can be used for tracing
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87 extern Mutex* Debug2_lock; // down synchronization related bugs!
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88 extern Mutex* Debug3_lock;
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89
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90 extern Mutex* RawMonitor_lock;
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91 extern Mutex* PerfDataMemAlloc_lock; // a lock on the allocator for PerfData memory for performance data
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92 extern Mutex* PerfDataManager_lock; // a long on access to PerfDataManager resources
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93 extern Mutex* ParkerFreeList_lock;
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94 extern Mutex* OopMapCacheAlloc_lock; // protects allocation of oop_map caches
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95
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96 extern Mutex* Management_lock; // a lock used to serialize JVM management
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97 extern Monitor* LowMemory_lock; // a lock used for low memory detection
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98
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99 // A MutexLocker provides mutual exclusion with respect to a given mutex
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100 // for the scope which contains the locker. The lock is an OS lock, not
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101 // an object lock, and the two do not interoperate. Do not use Mutex-based
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102 // locks to lock on Java objects, because they will not be respected if a
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103 // that object is locked using the Java locking mechanism.
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104 //
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105 // NOTE WELL!!
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106 //
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107 // See orderAccess.hpp. We assume throughout the VM that MutexLocker's
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108 // and friends constructors do a fence, a lock and an acquire *in that
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109 // order*. And that their destructors do a release and unlock, in *that*
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110 // order. If their implementations change such that these assumptions
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111 // are violated, a whole lot of code will break.
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112
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113 // Print all mutexes/monitors that are currently owned by a thread; called
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114 // by fatal error handler.
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115 void print_owned_locks_on_error(outputStream* st);
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116
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117 char *lock_name(Mutex *mutex);
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118
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119 class MutexLocker: StackObj {
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120 private:
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121 Monitor * _mutex;
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122 public:
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123 MutexLocker(Monitor * mutex) {
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124 assert(mutex->rank() != Mutex::special,
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125 "Special ranked mutex should only use MutexLockerEx");
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126 _mutex = mutex;
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127 _mutex->lock();
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128 }
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129
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130 // Overloaded constructor passing current thread
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131 MutexLocker(Monitor * mutex, Thread *thread) {
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132 assert(mutex->rank() != Mutex::special,
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133 "Special ranked mutex should only use MutexLockerEx");
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134 _mutex = mutex;
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135 _mutex->lock(thread);
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136 }
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137
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138 ~MutexLocker() {
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139 _mutex->unlock();
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140 }
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141
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142 };
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143
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144 // for debugging: check that we're already owning this lock (or are at a safepoint)
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145 #ifdef ASSERT
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146 void assert_locked_or_safepoint(const Monitor * lock);
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147 void assert_lock_strong(const Monitor * lock);
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148 #else
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149 #define assert_locked_or_safepoint(lock)
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150 #define assert_lock_strong(lock)
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151 #endif
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152
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153 // A MutexLockerEx behaves like a MutexLocker when its constructor is
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154 // called with a Mutex. Unlike a MutexLocker, its constructor can also be
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155 // called with NULL, in which case the MutexLockerEx is a no-op. There
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156 // is also a corresponding MutexUnlockerEx. We want to keep the
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157 // basic MutexLocker as fast as possible. MutexLockerEx can also lock
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158 // without safepoint check.
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159
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160 class MutexLockerEx: public StackObj {
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161 private:
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162 Monitor * _mutex;
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163 public:
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164 MutexLockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) {
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165 _mutex = mutex;
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166 if (_mutex != NULL) {
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167 assert(mutex->rank() > Mutex::special || no_safepoint_check,
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168 "Mutexes with rank special or lower should not do safepoint checks");
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169 if (no_safepoint_check)
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170 _mutex->lock_without_safepoint_check();
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171 else
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172 _mutex->lock();
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173 }
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174 }
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175
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176 ~MutexLockerEx() {
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177 if (_mutex != NULL) {
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178 _mutex->unlock();
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179 }
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180 }
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181 };
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182
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183 // A MonitorLockerEx is like a MutexLockerEx above, except it takes
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184 // a possibly null Monitor, and allows wait/notify as well which are
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185 // delegated to the underlying Monitor.
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186
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187 class MonitorLockerEx: public MutexLockerEx {
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188 private:
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189 Monitor * _monitor;
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190 public:
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191 MonitorLockerEx(Monitor* monitor,
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192 bool no_safepoint_check = !Mutex::_no_safepoint_check_flag):
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193 MutexLockerEx(monitor, no_safepoint_check),
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194 _monitor(monitor) {
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195 // Superclass constructor did locking
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196 }
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197
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198 ~MonitorLockerEx() {
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199 #ifdef ASSERT
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200 if (_monitor != NULL) {
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201 assert_lock_strong(_monitor);
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202 }
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203 #endif // ASSERT
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204 // Superclass destructor will do unlocking
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205 }
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206
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207 bool wait(bool no_safepoint_check = !Mutex::_no_safepoint_check_flag,
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208 long timeout = 0,
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209 bool as_suspend_equivalent = !Mutex::_as_suspend_equivalent_flag) {
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210 if (_monitor != NULL) {
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211 return _monitor->wait(no_safepoint_check, timeout, as_suspend_equivalent);
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212 }
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213 return false;
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214 }
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215
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216 bool notify_all() {
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217 if (_monitor != NULL) {
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218 return _monitor->notify_all();
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219 }
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220 return true;
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221 }
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222
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223 bool notify() {
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224 if (_monitor != NULL) {
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225 return _monitor->notify();
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226 }
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227 return true;
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228 }
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229 };
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230
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231
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232
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233 // A GCMutexLocker is usually initialized with a mutex that is
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234 // automatically acquired in order to do GC. The function that
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235 // synchronizes using a GCMutexLocker may be called both during and between
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236 // GC's. Thus, it must acquire the mutex if GC is not in progress, but not
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237 // if GC is in progress (since the mutex is already held on its behalf.)
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238
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239 class GCMutexLocker: public StackObj {
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240 private:
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241 Monitor * _mutex;
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242 bool _locked;
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243 public:
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244 GCMutexLocker(Monitor * mutex);
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245 ~GCMutexLocker() { if (_locked) _mutex->unlock(); }
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246 };
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247
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248
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249
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250 // A MutexUnlocker temporarily exits a previously
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251 // entered mutex for the scope which contains the unlocker.
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252
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253 class MutexUnlocker: StackObj {
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254 private:
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255 Monitor * _mutex;
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256
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257 public:
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258 MutexUnlocker(Monitor * mutex) {
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259 _mutex = mutex;
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260 _mutex->unlock();
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261 }
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262
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263 ~MutexUnlocker() {
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264 _mutex->lock();
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265 }
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266 };
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267
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268 // A MutexUnlockerEx temporarily exits a previously
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269 // entered mutex for the scope which contains the unlocker.
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270
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271 class MutexUnlockerEx: StackObj {
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272 private:
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273 Monitor * _mutex;
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274 bool _no_safepoint_check;
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275
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276 public:
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277 MutexUnlockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) {
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278 _mutex = mutex;
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279 _no_safepoint_check = no_safepoint_check;
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280 _mutex->unlock();
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281 }
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282
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283 ~MutexUnlockerEx() {
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284 if (_no_safepoint_check == Mutex::_no_safepoint_check_flag) {
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285 _mutex->lock_without_safepoint_check();
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286 } else {
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287 _mutex->lock();
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288 }
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289 }
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290 };
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291
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292 #ifndef PRODUCT
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293 //
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294 // A special MutexLocker that allows:
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295 // - reentrant locking
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296 // - locking out of order
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297 //
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298 // Only too be used for verify code, where we can relaxe out dead-lock
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299 // dection code a bit (unsafe, but probably ok). This code is NEVER to
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300 // be included in a product version.
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301 //
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302 class VerifyMutexLocker: StackObj {
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303 private:
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304 Monitor * _mutex;
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305 bool _reentrant;
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306 public:
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307 VerifyMutexLocker(Monitor * mutex) {
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308 _mutex = mutex;
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309 _reentrant = mutex->owned_by_self();
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310 if (!_reentrant) {
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311 // We temp. diable strict safepoint checking, while we require the lock
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312 FlagSetting fs(StrictSafepointChecks, false);
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313 _mutex->lock();
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314 }
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315 }
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316
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317 ~VerifyMutexLocker() {
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318 if (!_reentrant) {
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319 _mutex->unlock();
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320 }
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321 }
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322 };
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323
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324 #endif
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