mutexLocker.cpp revision 0:a61af66fc99e
1/* 2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25#include "incls/_precompiled.incl" 26#include "incls/_mutexLocker.cpp.incl" 27 28// Mutexes used in the VM (see comment in mutexLocker.hpp): 29// 30// Note that the following pointers are effectively final -- after having been 31// set at JVM startup-time, they should never be subsequently mutated. 32// Instead of using pointers to malloc()ed monitors and mutexes we should consider 33// eliminating the indirection and using instances instead. 34// Consider using GCC's __read_mostly. 35 36Mutex* Patching_lock = NULL; 37Monitor* SystemDictionary_lock = NULL; 38Mutex* PackageTable_lock = NULL; 39Mutex* CompiledIC_lock = NULL; 40Mutex* InlineCacheBuffer_lock = NULL; 41Mutex* VMStatistic_lock = NULL; 42Mutex* JNIGlobalHandle_lock = NULL; 43Mutex* JNIHandleBlockFreeList_lock = NULL; 44Mutex* JNICachedItableIndex_lock = NULL; 45Mutex* JmethodIdCreation_lock = NULL; 46Mutex* JfieldIdCreation_lock = NULL; 47Monitor* JNICritical_lock = NULL; 48Mutex* JvmtiThreadState_lock = NULL; 49Monitor* JvmtiPendingEvent_lock = NULL; 50Mutex* Heap_lock = NULL; 51Mutex* ExpandHeap_lock = NULL; 52Mutex* AdapterHandlerLibrary_lock = NULL; 53Mutex* SignatureHandlerLibrary_lock = NULL; 54Mutex* VtableStubs_lock = NULL; 55Mutex* SymbolTable_lock = NULL; 56Mutex* StringTable_lock = NULL; 57Mutex* CodeCache_lock = NULL; 58Mutex* MethodData_lock = NULL; 59Mutex* RetData_lock = NULL; 60Monitor* VMOperationQueue_lock = NULL; 61Monitor* VMOperationRequest_lock = NULL; 62Monitor* Safepoint_lock = NULL; 63Monitor* SerializePage_lock = NULL; 64Monitor* Threads_lock = NULL; 65Monitor* CGC_lock = NULL; 66Mutex* STS_init_lock = NULL; 67Monitor* SLT_lock = NULL; 68Monitor* iCMS_lock = NULL; 69Monitor* FullGCCount_lock = NULL; 70Mutex* ParGCRareEvent_lock = NULL; 71Mutex* DerivedPointerTableGC_lock = NULL; 72Mutex* Compile_lock = NULL; 73Monitor* MethodCompileQueue_lock = NULL; 74#ifdef TIERED 75Monitor* C1_lock = NULL; 76#endif // TIERED 77Monitor* CompileThread_lock = NULL; 78Mutex* CompileTaskAlloc_lock = NULL; 79Mutex* CompileStatistics_lock = NULL; 80Mutex* MultiArray_lock = NULL; 81Monitor* Terminator_lock = NULL; 82Monitor* BeforeExit_lock = NULL; 83Monitor* Notify_lock = NULL; 84Monitor* Interrupt_lock = NULL; 85Monitor* ProfileVM_lock = NULL; 86Mutex* ProfilePrint_lock = NULL; 87Mutex* ExceptionCache_lock = NULL; 88Monitor* ObjAllocPost_lock = NULL; 89Mutex* OsrList_lock = NULL; 90#ifndef PRODUCT 91Mutex* FullGCALot_lock = NULL; 92#endif 93 94Mutex* Debug1_lock = NULL; 95Mutex* Debug2_lock = NULL; 96Mutex* Debug3_lock = NULL; 97 98Mutex* tty_lock = NULL; 99 100Mutex* RawMonitor_lock = NULL; 101Mutex* PerfDataMemAlloc_lock = NULL; 102Mutex* PerfDataManager_lock = NULL; 103Mutex* OopMapCacheAlloc_lock = NULL; 104 105Monitor* GCTaskManager_lock = NULL; 106 107Mutex* Management_lock = NULL; 108Monitor* LowMemory_lock = NULL; 109 110#define MAX_NUM_MUTEX 128 111static Monitor * _mutex_array[MAX_NUM_MUTEX]; 112static int _num_mutex; 113 114#ifdef ASSERT 115void assert_locked_or_safepoint(const Monitor * lock) { 116 // check if this thread owns the lock (common case) 117 if (IgnoreLockingAssertions) return; 118 assert(lock != NULL, "Need non-NULL lock"); 119 if (lock->owned_by_self()) return; 120 if (SafepointSynchronize::is_at_safepoint()) return; 121 if (!Universe::is_fully_initialized()) return; 122 // see if invoker of VM operation owns it 123 VM_Operation* op = VMThread::vm_operation(); 124 if (op != NULL && op->calling_thread() == lock->owner()) return; 125 fatal1("must own lock %s", lock->name()); 126} 127 128// a stronger assertion than the above 129void assert_lock_strong(const Monitor * lock) { 130 if (IgnoreLockingAssertions) return; 131 assert(lock != NULL, "Need non-NULL lock"); 132 if (lock->owned_by_self()) return; 133 fatal1("must own lock %s", lock->name()); 134} 135#endif 136 137#define def(var, type, pri, vm_block) { \ 138 var = new type(Mutex::pri, #var, vm_block); \ 139 assert(_num_mutex < MAX_NUM_MUTEX, \ 140 "increase MAX_NUM_MUTEX"); \ 141 _mutex_array[_num_mutex++] = var; \ 142} 143 144void mutex_init() { 145 def(tty_lock , Mutex , event, true ); // allow to lock in VM 146 147 def(CGC_lock , Monitor, special, true ); // coordinate between fore- and background GC 148 def(STS_init_lock , Mutex, leaf, true ); 149 if (UseConcMarkSweepGC) { 150 def(iCMS_lock , Monitor, special, true ); // CMS incremental mode start/stop notification 151 def(FullGCCount_lock , Monitor, leaf, true ); // in support of ExplicitGCInvokesConcurrent 152 } 153 def(ParGCRareEvent_lock , Mutex , leaf , true ); 154 def(DerivedPointerTableGC_lock , Mutex, leaf, true ); 155 def(CodeCache_lock , Mutex , special, true ); 156 def(Interrupt_lock , Monitor, special, true ); // used for interrupt processing 157 def(RawMonitor_lock , Mutex, special, true ); 158 def(OopMapCacheAlloc_lock , Mutex, leaf, true ); // used for oop_map_cache allocation. 159 160 def(Patching_lock , Mutex , special, true ); // used for safepointing and code patching. 161 def(ObjAllocPost_lock , Monitor, special, false); 162 def(LowMemory_lock , Monitor, special, true ); // used for low memory detection 163 def(JmethodIdCreation_lock , Mutex , leaf, true ); // used for creating jmethodIDs. 164 165 def(SystemDictionary_lock , Monitor, leaf, true ); // lookups done by VM thread 166 def(PackageTable_lock , Mutex , leaf, false); 167 def(InlineCacheBuffer_lock , Mutex , leaf, true ); 168 def(VMStatistic_lock , Mutex , leaf, false); 169 def(ExpandHeap_lock , Mutex , leaf, true ); // Used during compilation by VM thread 170 def(JNIHandleBlockFreeList_lock , Mutex , leaf, true ); // handles are used by VM thread 171 def(SignatureHandlerLibrary_lock , Mutex , leaf, false); 172 def(SymbolTable_lock , Mutex , leaf, true ); 173 def(StringTable_lock , Mutex , leaf, true ); 174 def(ProfilePrint_lock , Mutex , leaf, false); // serial profile printing 175 def(ExceptionCache_lock , Mutex , leaf, false); // serial profile printing 176 def(OsrList_lock , Mutex , leaf, true ); 177 def(Debug1_lock , Mutex , leaf, true ); 178#ifndef PRODUCT 179 def(FullGCALot_lock , Mutex , leaf, false); // a lock to make FullGCALot MT safe 180#endif 181 def(BeforeExit_lock , Monitor, leaf, true ); 182 def(PerfDataMemAlloc_lock , Mutex , leaf, true ); // used for allocating PerfData memory for performance data 183 def(PerfDataManager_lock , Mutex , leaf, true ); // used for synchronized access to PerfDataManager resources 184 185 // CMS_modUnionTable_lock leaf 186 // CMS_bitMap_lock leaf + 1 187 // CMS_freeList_lock leaf + 2 188 189 def(Safepoint_lock , Monitor, safepoint, true ); // locks SnippetCache_lock/Threads_lock 190 191 if (!UseMembar) { 192 def(SerializePage_lock , Monitor, leaf, true ); 193 } 194 195 def(Threads_lock , Monitor, barrier, true ); 196 197 def(VMOperationQueue_lock , Monitor, nonleaf, true ); // VM_thread allowed to block on these 198 def(VMOperationRequest_lock , Monitor, nonleaf, true ); 199 def(RetData_lock , Mutex , nonleaf, false); 200 def(Terminator_lock , Monitor, nonleaf, true ); 201 def(VtableStubs_lock , Mutex , nonleaf, true ); 202 def(Notify_lock , Monitor, nonleaf, true ); 203 def(JNIGlobalHandle_lock , Mutex , nonleaf, true ); // locks JNIHandleBlockFreeList_lock 204 def(JNICritical_lock , Monitor, nonleaf, true ); // used for JNI critical regions 205 def(AdapterHandlerLibrary_lock , Mutex , nonleaf, true); 206 if (UseConcMarkSweepGC) { 207 def(SLT_lock , Monitor, nonleaf, false ); 208 // used in CMS GC for locking PLL lock 209 } 210 def(Heap_lock , Mutex , nonleaf+1, false); 211 def(JfieldIdCreation_lock , Mutex , nonleaf+1, true ); // jfieldID, Used in VM_Operation 212 def(JNICachedItableIndex_lock , Mutex , nonleaf+1, false); // Used to cache an itable index during JNI invoke 213 214 def(CompiledIC_lock , Mutex , nonleaf+2, false); // locks VtableStubs_lock, InlineCacheBuffer_lock 215 def(CompileTaskAlloc_lock , Mutex , nonleaf+2, true ); 216 def(CompileStatistics_lock , Mutex , nonleaf+2, false); 217 def(MultiArray_lock , Mutex , nonleaf+2, false); // locks SymbolTable_lock 218 219 def(JvmtiThreadState_lock , Mutex , nonleaf+2, false); // Used by JvmtiThreadState/JvmtiEventController 220 def(JvmtiPendingEvent_lock , Monitor, nonleaf, false); // Used by JvmtiCodeBlobEvents 221 def(Management_lock , Mutex , nonleaf+2, false); // used for JVM management 222 223 def(Compile_lock , Mutex , nonleaf+3, true ); 224 def(MethodData_lock , Mutex , nonleaf+3, false); 225 226 def(MethodCompileQueue_lock , Monitor, nonleaf+4, true ); 227 def(Debug2_lock , Mutex , nonleaf+4, true ); 228 def(Debug3_lock , Mutex , nonleaf+4, true ); 229 def(ProfileVM_lock , Monitor, nonleaf+4, false); // used for profiling of the VMThread 230 def(CompileThread_lock , Monitor, nonleaf+5, false ); 231#ifdef TIERED 232 def(C1_lock , Monitor, nonleaf+5, false ); 233#endif // TIERED 234 235 236} 237 238GCMutexLocker::GCMutexLocker(Monitor * mutex) { 239 if (SafepointSynchronize::is_at_safepoint()) { 240 _locked = false; 241 } else { 242 _mutex = mutex; 243 _locked = true; 244 _mutex->lock(); 245 } 246} 247 248// Print all mutexes/monitors that are currently owned by a thread; called 249// by fatal error handler. 250void print_owned_locks_on_error(outputStream* st) { 251 st->print("VM Mutex/Monitor currently owned by a thread: "); 252 bool none = true; 253 for (int i = 0; i < _num_mutex; i++) { 254 // see if it has an owner 255 if (_mutex_array[i]->owner() != NULL) { 256 if (none) { 257 // print format used by Mutex::print_on_error() 258 st->print_cr(" ([mutex/lock_event])"); 259 none = false; 260 } 261 _mutex_array[i]->print_on_error(st); 262 st->cr(); 263 } 264 } 265 if (none) st->print_cr("None"); 266} 267