mutexLocker.cpp revision 3864:f34d701e952e
1/* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "runtime/mutexLocker.hpp" 27#include "runtime/safepoint.hpp" 28#include "runtime/thread.inline.hpp" 29#include "runtime/threadLocalStorage.hpp" 30#include "runtime/vmThread.hpp" 31 32// Mutexes used in the VM (see comment in mutexLocker.hpp): 33// 34// Note that the following pointers are effectively final -- after having been 35// set at JVM startup-time, they should never be subsequently mutated. 36// Instead of using pointers to malloc()ed monitors and mutexes we should consider 37// eliminating the indirection and using instances instead. 38// Consider using GCC's __read_mostly. 39 40Mutex* Patching_lock = NULL; 41Monitor* SystemDictionary_lock = NULL; 42Mutex* PackageTable_lock = NULL; 43Mutex* CompiledIC_lock = NULL; 44Mutex* InlineCacheBuffer_lock = NULL; 45Mutex* VMStatistic_lock = NULL; 46Mutex* JNIGlobalHandle_lock = NULL; 47Mutex* JNIHandleBlockFreeList_lock = NULL; 48Mutex* JNICachedItableIndex_lock = NULL; 49Mutex* JmethodIdCreation_lock = NULL; 50Mutex* JfieldIdCreation_lock = NULL; 51Monitor* JNICritical_lock = NULL; 52Mutex* JvmtiThreadState_lock = NULL; 53Monitor* JvmtiPendingEvent_lock = NULL; 54Monitor* Heap_lock = NULL; 55Mutex* ExpandHeap_lock = NULL; 56Mutex* AdapterHandlerLibrary_lock = NULL; 57Mutex* SignatureHandlerLibrary_lock = NULL; 58Mutex* VtableStubs_lock = NULL; 59Mutex* SymbolTable_lock = NULL; 60Mutex* StringTable_lock = NULL; 61Mutex* CodeCache_lock = NULL; 62Mutex* MethodData_lock = NULL; 63Mutex* RetData_lock = NULL; 64Monitor* VMOperationQueue_lock = NULL; 65Monitor* VMOperationRequest_lock = NULL; 66Monitor* Safepoint_lock = NULL; 67Monitor* SerializePage_lock = NULL; 68Monitor* Threads_lock = NULL; 69Monitor* CGC_lock = NULL; 70Mutex* STS_init_lock = NULL; 71Monitor* SLT_lock = NULL; 72Monitor* iCMS_lock = NULL; 73Monitor* FullGCCount_lock = NULL; 74Monitor* CMark_lock = NULL; 75Mutex* CMRegionStack_lock = NULL; 76Mutex* SATB_Q_FL_lock = NULL; 77Monitor* SATB_Q_CBL_mon = NULL; 78Mutex* Shared_SATB_Q_lock = NULL; 79Mutex* DirtyCardQ_FL_lock = NULL; 80Monitor* DirtyCardQ_CBL_mon = NULL; 81Mutex* Shared_DirtyCardQ_lock = NULL; 82Mutex* ParGCRareEvent_lock = NULL; 83Mutex* EvacFailureStack_lock = NULL; 84Mutex* DerivedPointerTableGC_lock = NULL; 85Mutex* Compile_lock = NULL; 86Monitor* MethodCompileQueue_lock = NULL; 87Monitor* CompileThread_lock = NULL; 88Mutex* CompileTaskAlloc_lock = NULL; 89Mutex* CompileStatistics_lock = NULL; 90Mutex* MultiArray_lock = NULL; 91Monitor* Terminator_lock = NULL; 92Monitor* BeforeExit_lock = NULL; 93Monitor* Notify_lock = NULL; 94Monitor* Interrupt_lock = NULL; 95Monitor* ProfileVM_lock = NULL; 96Mutex* ProfilePrint_lock = NULL; 97Mutex* ExceptionCache_lock = NULL; 98Monitor* ObjAllocPost_lock = NULL; 99Mutex* OsrList_lock = NULL; 100#ifndef PRODUCT 101Mutex* FullGCALot_lock = NULL; 102#endif 103 104Mutex* Debug1_lock = NULL; 105Mutex* Debug2_lock = NULL; 106Mutex* Debug3_lock = NULL; 107 108Mutex* tty_lock = NULL; 109 110Mutex* RawMonitor_lock = NULL; 111Mutex* PerfDataMemAlloc_lock = NULL; 112Mutex* PerfDataManager_lock = NULL; 113Mutex* OopMapCacheAlloc_lock = NULL; 114 115Mutex* FreeList_lock = NULL; 116Monitor* SecondaryFreeList_lock = NULL; 117Mutex* OldSets_lock = NULL; 118Monitor* RootRegionScan_lock = NULL; 119Mutex* MMUTracker_lock = NULL; 120Mutex* HotCardCache_lock = NULL; 121 122Monitor* GCTaskManager_lock = NULL; 123 124Mutex* Management_lock = NULL; 125Monitor* Service_lock = NULL; 126Mutex* Stacktrace_lock = NULL; 127 128Monitor* JfrQuery_lock = NULL; 129Monitor* JfrMsg_lock = NULL; 130Mutex* JfrBuffer_lock = NULL; 131Mutex* JfrStream_lock = NULL; 132Monitor* PeriodicTask_lock = NULL; 133 134#define MAX_NUM_MUTEX 128 135static Monitor * _mutex_array[MAX_NUM_MUTEX]; 136static int _num_mutex; 137 138#ifdef ASSERT 139void assert_locked_or_safepoint(const Monitor * lock) { 140 // check if this thread owns the lock (common case) 141 if (IgnoreLockingAssertions) return; 142 assert(lock != NULL, "Need non-NULL lock"); 143 if (lock->owned_by_self()) return; 144 if (SafepointSynchronize::is_at_safepoint()) return; 145 if (!Universe::is_fully_initialized()) return; 146 // see if invoker of VM operation owns it 147 VM_Operation* op = VMThread::vm_operation(); 148 if (op != NULL && op->calling_thread() == lock->owner()) return; 149 fatal(err_msg("must own lock %s", lock->name())); 150} 151 152// a stronger assertion than the above 153void assert_lock_strong(const Monitor * lock) { 154 if (IgnoreLockingAssertions) return; 155 assert(lock != NULL, "Need non-NULL lock"); 156 if (lock->owned_by_self()) return; 157 fatal(err_msg("must own lock %s", lock->name())); 158} 159#endif 160 161#define def(var, type, pri, vm_block) { \ 162 var = new type(Mutex::pri, #var, vm_block); \ 163 assert(_num_mutex < MAX_NUM_MUTEX, \ 164 "increase MAX_NUM_MUTEX"); \ 165 _mutex_array[_num_mutex++] = var; \ 166} 167 168void mutex_init() { 169 def(tty_lock , Mutex , event, true ); // allow to lock in VM 170 171 def(CGC_lock , Monitor, special, true ); // coordinate between fore- and background GC 172 def(STS_init_lock , Mutex, leaf, true ); 173 if (UseConcMarkSweepGC) { 174 def(iCMS_lock , Monitor, special, true ); // CMS incremental mode start/stop notification 175 } 176 if (UseConcMarkSweepGC || UseG1GC) { 177 def(FullGCCount_lock , Monitor, leaf, true ); // in support of ExplicitGCInvokesConcurrent 178 } 179 if (UseG1GC) { 180 def(CMark_lock , Monitor, nonleaf, true ); // coordinate concurrent mark thread 181 def(CMRegionStack_lock , Mutex, leaf, true ); 182 def(SATB_Q_FL_lock , Mutex , special, true ); 183 def(SATB_Q_CBL_mon , Monitor, nonleaf, true ); 184 def(Shared_SATB_Q_lock , Mutex, nonleaf, true ); 185 186 def(DirtyCardQ_FL_lock , Mutex , special, true ); 187 def(DirtyCardQ_CBL_mon , Monitor, nonleaf, true ); 188 def(Shared_DirtyCardQ_lock , Mutex, nonleaf, true ); 189 190 def(FreeList_lock , Mutex, leaf , true ); 191 def(SecondaryFreeList_lock , Monitor, leaf , true ); 192 def(OldSets_lock , Mutex , leaf , true ); 193 def(RootRegionScan_lock , Monitor, leaf , true ); 194 def(MMUTracker_lock , Mutex , leaf , true ); 195 def(HotCardCache_lock , Mutex , special , true ); 196 def(EvacFailureStack_lock , Mutex , nonleaf , true ); 197 } 198 def(ParGCRareEvent_lock , Mutex , leaf , true ); 199 def(DerivedPointerTableGC_lock , Mutex, leaf, true ); 200 def(CodeCache_lock , Mutex , special, true ); 201 def(Interrupt_lock , Monitor, special, true ); // used for interrupt processing 202 def(RawMonitor_lock , Mutex, special, true ); 203 def(OopMapCacheAlloc_lock , Mutex, leaf, true ); // used for oop_map_cache allocation. 204 205 def(Patching_lock , Mutex , special, true ); // used for safepointing and code patching. 206 def(ObjAllocPost_lock , Monitor, special, false); 207 def(Service_lock , Monitor, special, true ); // used for service thread operations 208 def(Stacktrace_lock , Mutex, special, true ); // used for JFR stacktrace database 209 def(JmethodIdCreation_lock , Mutex , leaf, true ); // used for creating jmethodIDs. 210 211 def(SystemDictionary_lock , Monitor, leaf, true ); // lookups done by VM thread 212 def(PackageTable_lock , Mutex , leaf, false); 213 def(InlineCacheBuffer_lock , Mutex , leaf, true ); 214 def(VMStatistic_lock , Mutex , leaf, false); 215 def(ExpandHeap_lock , Mutex , leaf, true ); // Used during compilation by VM thread 216 def(JNIHandleBlockFreeList_lock , Mutex , leaf, true ); // handles are used by VM thread 217 def(SignatureHandlerLibrary_lock , Mutex , leaf, false); 218 def(SymbolTable_lock , Mutex , leaf+2, true ); 219 def(StringTable_lock , Mutex , leaf, true ); 220 def(ProfilePrint_lock , Mutex , leaf, false); // serial profile printing 221 def(ExceptionCache_lock , Mutex , leaf, false); // serial profile printing 222 def(OsrList_lock , Mutex , leaf, true ); 223 def(Debug1_lock , Mutex , leaf, true ); 224#ifndef PRODUCT 225 def(FullGCALot_lock , Mutex , leaf, false); // a lock to make FullGCALot MT safe 226#endif 227 def(BeforeExit_lock , Monitor, leaf, true ); 228 def(PerfDataMemAlloc_lock , Mutex , leaf, true ); // used for allocating PerfData memory for performance data 229 def(PerfDataManager_lock , Mutex , leaf, true ); // used for synchronized access to PerfDataManager resources 230 231 // CMS_modUnionTable_lock leaf 232 // CMS_bitMap_lock leaf + 1 233 // CMS_freeList_lock leaf + 2 234 235 def(Safepoint_lock , Monitor, safepoint, true ); // locks SnippetCache_lock/Threads_lock 236 237 def(Threads_lock , Monitor, barrier, true ); 238 239 def(VMOperationQueue_lock , Monitor, nonleaf, true ); // VM_thread allowed to block on these 240 def(VMOperationRequest_lock , Monitor, nonleaf, true ); 241 def(RetData_lock , Mutex , nonleaf, false); 242 def(Terminator_lock , Monitor, nonleaf, true ); 243 def(VtableStubs_lock , Mutex , nonleaf, true ); 244 def(Notify_lock , Monitor, nonleaf, true ); 245 def(JNIGlobalHandle_lock , Mutex , nonleaf, true ); // locks JNIHandleBlockFreeList_lock 246 def(JNICritical_lock , Monitor, nonleaf, true ); // used for JNI critical regions 247 def(AdapterHandlerLibrary_lock , Mutex , nonleaf, true); 248 if (UseConcMarkSweepGC) { 249 def(SLT_lock , Monitor, nonleaf, false ); 250 // used in CMS GC for locking PLL lock 251 } 252 def(Heap_lock , Monitor, nonleaf+1, false); 253 def(JfieldIdCreation_lock , Mutex , nonleaf+1, true ); // jfieldID, Used in VM_Operation 254 def(JNICachedItableIndex_lock , Mutex , nonleaf+1, false); // Used to cache an itable index during JNI invoke 255 256 def(CompiledIC_lock , Mutex , nonleaf+2, false); // locks VtableStubs_lock, InlineCacheBuffer_lock 257 def(CompileTaskAlloc_lock , Mutex , nonleaf+2, true ); 258 def(CompileStatistics_lock , Mutex , nonleaf+2, false); 259 def(MultiArray_lock , Mutex , nonleaf+2, false); // locks SymbolTable_lock 260 261 def(JvmtiThreadState_lock , Mutex , nonleaf+2, false); // Used by JvmtiThreadState/JvmtiEventController 262 def(JvmtiPendingEvent_lock , Monitor, nonleaf, false); // Used by JvmtiCodeBlobEvents 263 def(Management_lock , Mutex , nonleaf+2, false); // used for JVM management 264 265 def(Compile_lock , Mutex , nonleaf+3, true ); 266 def(MethodData_lock , Mutex , nonleaf+3, false); 267 268 def(MethodCompileQueue_lock , Monitor, nonleaf+4, true ); 269 def(Debug2_lock , Mutex , nonleaf+4, true ); 270 def(Debug3_lock , Mutex , nonleaf+4, true ); 271 def(ProfileVM_lock , Monitor, nonleaf+4, false); // used for profiling of the VMThread 272 def(CompileThread_lock , Monitor, nonleaf+5, false ); 273 274 def(JfrQuery_lock , Monitor, nonleaf, true); // JFR locks, keep these in consecutive order 275 def(JfrMsg_lock , Monitor, nonleaf+2, true); 276 def(JfrBuffer_lock , Mutex, nonleaf+3, true); 277 def(JfrStream_lock , Mutex, nonleaf+4, true); 278 def(PeriodicTask_lock , Monitor, nonleaf+5, true); 279} 280 281GCMutexLocker::GCMutexLocker(Monitor * mutex) { 282 if (SafepointSynchronize::is_at_safepoint()) { 283 _locked = false; 284 } else { 285 _mutex = mutex; 286 _locked = true; 287 _mutex->lock(); 288 } 289} 290 291// Print all mutexes/monitors that are currently owned by a thread; called 292// by fatal error handler. 293void print_owned_locks_on_error(outputStream* st) { 294 st->print("VM Mutex/Monitor currently owned by a thread: "); 295 bool none = true; 296 for (int i = 0; i < _num_mutex; i++) { 297 // see if it has an owner 298 if (_mutex_array[i]->owner() != NULL) { 299 if (none) { 300 // print format used by Mutex::print_on_error() 301 st->print_cr(" ([mutex/lock_event])"); 302 none = false; 303 } 304 _mutex_array[i]->print_on_error(st); 305 st->cr(); 306 } 307 } 308 if (none) st->print_cr("None"); 309} 310