1 /* 2 * Copyright (c) 1997, 2025, 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 "compiler/compiler_globals.hpp" 26 #include "gc/shared/gc_globals.hpp" 27 #include "logging/log.hpp" 28 #include "logging/logStream.hpp" 29 #include "memory/resourceArea.hpp" 30 #include "memory/universe.hpp" 31 #include "runtime/java.hpp" 32 #include "runtime/javaThread.hpp" 33 #include "runtime/mutexLocker.hpp" 34 #include "runtime/safepoint.hpp" 35 #include "runtime/vmThread.hpp" 36 #include "services/management.hpp" 37 #include "utilities/vmError.hpp" 38 39 // Mutexes used in the VM (see comment in mutexLocker.hpp): 40 41 Mutex* NMethodState_lock = nullptr; 42 Monitor* SystemDictionary_lock = nullptr; 43 Mutex* InvokeMethodTypeTable_lock = nullptr; 44 Monitor* InvokeMethodIntrinsicTable_lock = nullptr; 45 Mutex* SharedDictionary_lock = nullptr; 46 Monitor* ClassInitError_lock = nullptr; 47 Mutex* Module_lock = nullptr; 48 Mutex* CompiledIC_lock = nullptr; 49 Mutex* VMStatistic_lock = nullptr; 50 Mutex* JmethodIdCreation_lock = nullptr; 51 Mutex* JfieldIdCreation_lock = nullptr; 52 Monitor* JNICritical_lock = nullptr; 53 Mutex* JvmtiThreadState_lock = nullptr; 54 Monitor* EscapeBarrier_lock = nullptr; 55 Monitor* JvmtiVTMSTransition_lock = nullptr; 56 Mutex* JvmtiVThreadSuspend_lock = nullptr; 57 Monitor* Heap_lock = nullptr; 58 #if INCLUDE_PARALLELGC 59 Mutex* PSOldGenExpand_lock = nullptr; 60 #endif 61 Mutex* AdapterHandlerLibrary_lock = nullptr; 62 Mutex* SignatureHandlerLibrary_lock = nullptr; 63 Mutex* VtableStubs_lock = nullptr; 64 Mutex* SymbolArena_lock = nullptr; 65 Monitor* StringDedup_lock = nullptr; 66 Mutex* StringDedupIntern_lock = nullptr; 67 Monitor* CodeCache_lock = nullptr; 68 Mutex* TouchedMethodLog_lock = nullptr; 69 Mutex* RetData_lock = nullptr; 70 Monitor* VMOperation_lock = nullptr; 71 Monitor* ThreadsLockThrottle_lock = nullptr; 72 Monitor* Threads_lock = nullptr; 73 Mutex* NonJavaThreadsList_lock = nullptr; 74 Mutex* NonJavaThreadsListSync_lock = nullptr; 75 Monitor* CGC_lock = nullptr; 76 Monitor* STS_lock = nullptr; 77 Monitor* G1OldGCCount_lock = nullptr; 78 Mutex* G1RareEvent_lock = nullptr; 79 Mutex* G1DetachedRefinementStats_lock = nullptr; 80 Mutex* MarkStackFreeList_lock = nullptr; 81 Mutex* MarkStackChunkList_lock = nullptr; 82 Mutex* MonitoringSupport_lock = nullptr; 83 Monitor* ConcurrentGCBreakpoints_lock = nullptr; 84 Mutex* Compile_lock = nullptr; 85 Monitor* CompileTaskWait_lock = nullptr; 86 Monitor* MethodCompileQueue_lock = nullptr; 87 Monitor* MethodCompileQueueC1_lock = nullptr; 88 Monitor* MethodCompileQueueC2_lock = nullptr; 89 Monitor* MethodCompileQueueC3_lock = nullptr; 90 Monitor* MethodCompileQueueSC1_lock = nullptr; 91 Monitor* MethodCompileQueueSC2_lock = nullptr; 92 Monitor* CompileThread_lock = nullptr; 93 Monitor* Compilation_lock = nullptr; 94 Mutex* CompileTaskAlloc_lock = nullptr; 95 Mutex* CompileStatistics_lock = nullptr; 96 Mutex* DirectivesStack_lock = nullptr; 97 Monitor* Terminator_lock = nullptr; 98 Monitor* InitCompleted_lock = nullptr; 99 Monitor* BeforeExit_lock = nullptr; 100 Monitor* Notify_lock = nullptr; 101 Mutex* ExceptionCache_lock = nullptr; 102 Mutex* TrainingData_lock = nullptr; 103 Monitor* TrainingReplayQueue_lock = nullptr; 104 #ifndef PRODUCT 105 Mutex* FullGCALot_lock = nullptr; 106 #endif 107 108 Mutex* tty_lock = nullptr; 109 110 Mutex* RawMonitor_lock = nullptr; 111 Mutex* PerfDataMemAlloc_lock = nullptr; 112 Mutex* PerfDataManager_lock = nullptr; 113 114 Mutex* FreeList_lock = nullptr; 115 Mutex* OldSets_lock = nullptr; 116 Mutex* Uncommit_lock = nullptr; 117 Monitor* RootRegionScan_lock = nullptr; 118 119 Mutex* Management_lock = nullptr; 120 Monitor* MonitorDeflation_lock = nullptr; 121 Monitor* Service_lock = nullptr; 122 Monitor* Notification_lock = nullptr; 123 Monitor* PeriodicTask_lock = nullptr; 124 Monitor* RedefineClasses_lock = nullptr; 125 Mutex* Verify_lock = nullptr; 126 127 #if INCLUDE_JFR 128 Mutex* JfrStacktrace_lock = nullptr; 129 Monitor* JfrMsg_lock = nullptr; 130 Mutex* JfrBuffer_lock = nullptr; 131 #endif 132 133 Mutex* CodeHeapStateAnalytics_lock = nullptr; 134 135 Mutex* ExternalsRecorder_lock = nullptr; 136 137 Mutex* AOTCodeCStrings_lock = nullptr; 138 139 Monitor* ContinuationRelativize_lock = nullptr; 140 141 Mutex* Metaspace_lock = nullptr; 142 Monitor* MetaspaceCritical_lock = nullptr; 143 Mutex* ClassLoaderDataGraph_lock = nullptr; 144 Monitor* ThreadsSMRDelete_lock = nullptr; 145 Mutex* ThreadIdTableCreate_lock = nullptr; 146 Mutex* SharedDecoder_lock = nullptr; 147 Mutex* DCmdFactory_lock = nullptr; 148 Mutex* NMTQuery_lock = nullptr; 149 Mutex* NMTCompilationCostHistory_lock = nullptr; 150 Mutex* NmtVirtualMemory_lock = nullptr; 151 152 #if INCLUDE_CDS 153 #if INCLUDE_JVMTI 154 Mutex* CDSClassFileStream_lock = nullptr; 155 #endif 156 Mutex* DumpTimeTable_lock = nullptr; 157 Mutex* CDSLambda_lock = nullptr; 158 Mutex* DumpRegion_lock = nullptr; 159 Mutex* ClassListFile_lock = nullptr; 160 Mutex* UnregisteredClassesTable_lock= nullptr; 161 Mutex* LambdaFormInvokers_lock = nullptr; 162 Mutex* ScratchObjects_lock = nullptr; 163 Mutex* ArchivedObjectTables_lock = nullptr; 164 Mutex* FinalImageRecipes_lock = nullptr; 165 #endif // INCLUDE_CDS 166 Mutex* Bootclasspath_lock = nullptr; 167 168 #if INCLUDE_JVMCI 169 Monitor* JVMCI_lock = nullptr; 170 Monitor* JVMCIRuntime_lock = nullptr; 171 #endif 172 173 // Only one RecursiveMutex 174 RecursiveMutex* MultiArray_lock = nullptr; 175 176 #ifdef ASSERT 177 void assert_locked_or_safepoint(const Mutex* lock) { 178 if (DebuggingContext::is_enabled() || VMError::is_error_reported()) return; 179 // check if this thread owns the lock (common case) 180 assert(lock != nullptr, "Need non-null lock"); 181 if (lock->owned_by_self()) return; 182 if (SafepointSynchronize::is_at_safepoint()) return; 183 if (!Universe::is_fully_initialized()) return; 184 fatal("must own lock %s", lock->name()); 185 } 186 187 // a stronger assertion than the above 188 void assert_lock_strong(const Mutex* lock) { 189 if (DebuggingContext::is_enabled() || VMError::is_error_reported()) return; 190 assert(lock != nullptr, "Need non-null lock"); 191 if (lock->owned_by_self()) return; 192 fatal("must own lock %s", lock->name()); 193 } 194 #endif 195 196 #define MUTEX_STORAGE_NAME(name) name##_storage 197 #define MUTEX_STORAGE(name, type) alignas(type) static uint8_t MUTEX_STORAGE_NAME(name)[sizeof(type)] 198 #define MUTEX_DEF(name, type, pri, ...) { \ 199 assert(name == nullptr, "Mutex/Monitor initialized twice"); \ 200 MUTEX_STORAGE(name, type); \ 201 name = ::new(static_cast<void*>(MUTEX_STORAGE_NAME(name))) type((pri), #name, ##__VA_ARGS__); \ 202 Mutex::add_mutex(name); \ 203 } 204 #define MUTEX_DEFN(name, type, pri, ...) MUTEX_DEF(name, type, Mutex::pri, ##__VA_ARGS__) 205 206 // Specify relative ranked lock 207 #ifdef ASSERT 208 #define MUTEX_DEFL(name, type, held_lock, ...) MUTEX_DEF(name, type, (held_lock)->rank() - 1, ##__VA_ARGS__) 209 #else 210 #define MUTEX_DEFL(name, type, held_lock, ...) MUTEX_DEFN(name, type, safepoint, ##__VA_ARGS__) 211 #endif 212 213 // Using Padded subclasses to prevent false sharing of these global monitors and mutexes. 214 void mutex_init() { 215 MUTEX_DEFN(tty_lock , PaddedMutex , tty); // allow to lock in VM 216 217 MUTEX_DEFN(STS_lock , PaddedMonitor, nosafepoint); 218 219 if (UseG1GC) { 220 MUTEX_DEFN(CGC_lock , PaddedMonitor, nosafepoint); 221 222 MUTEX_DEFN(G1DetachedRefinementStats_lock, PaddedMutex , nosafepoint-2); 223 224 MUTEX_DEFN(FreeList_lock , PaddedMutex , service-1); 225 MUTEX_DEFN(OldSets_lock , PaddedMutex , nosafepoint); 226 MUTEX_DEFN(Uncommit_lock , PaddedMutex , service-2); 227 MUTEX_DEFN(RootRegionScan_lock , PaddedMonitor, nosafepoint-1); 228 229 MUTEX_DEFN(MarkStackFreeList_lock , PaddedMutex , nosafepoint); 230 MUTEX_DEFN(MarkStackChunkList_lock , PaddedMutex , nosafepoint); 231 } 232 MUTEX_DEFN(MonitoringSupport_lock , PaddedMutex , service-1); // used for serviceability monitoring support 233 234 MUTEX_DEFN(StringDedup_lock , PaddedMonitor, nosafepoint); 235 MUTEX_DEFN(StringDedupIntern_lock , PaddedMutex , nosafepoint); 236 MUTEX_DEFN(RawMonitor_lock , PaddedMutex , nosafepoint-1); 237 238 MUTEX_DEFN(Metaspace_lock , PaddedMutex , nosafepoint-3); 239 MUTEX_DEFN(MetaspaceCritical_lock , PaddedMonitor, nosafepoint-1); 240 241 MUTEX_DEFN(MonitorDeflation_lock , PaddedMonitor, nosafepoint); // used for monitor deflation thread operations 242 MUTEX_DEFN(Service_lock , PaddedMonitor, service); // used for service thread operations 243 MUTEX_DEFN(Notification_lock , PaddedMonitor, service); // used for notification thread operations 244 245 MUTEX_DEFN(JmethodIdCreation_lock , PaddedMutex , nosafepoint-2); // used for creating jmethodIDs. 246 MUTEX_DEFN(InvokeMethodTypeTable_lock , PaddedMutex , safepoint); 247 MUTEX_DEFN(InvokeMethodIntrinsicTable_lock , PaddedMonitor, safepoint); 248 MUTEX_DEFN(AdapterHandlerLibrary_lock , PaddedMutex , safepoint); 249 MUTEX_DEFN(SharedDictionary_lock , PaddedMutex , safepoint); 250 MUTEX_DEFN(VMStatistic_lock , PaddedMutex , safepoint); 251 MUTEX_DEFN(SignatureHandlerLibrary_lock , PaddedMutex , safepoint); 252 MUTEX_DEFN(SymbolArena_lock , PaddedMutex , nosafepoint); 253 MUTEX_DEFN(ExceptionCache_lock , PaddedMutex , safepoint); 254 #ifndef PRODUCT 255 MUTEX_DEFN(FullGCALot_lock , PaddedMutex , safepoint); // a lock to make FullGCALot MT safe 256 #endif 257 MUTEX_DEFN(BeforeExit_lock , PaddedMonitor, safepoint); 258 259 MUTEX_DEFN(NonJavaThreadsList_lock , PaddedMutex , nosafepoint-1); 260 MUTEX_DEFN(NonJavaThreadsListSync_lock , PaddedMutex , nosafepoint); 261 262 MUTEX_DEFN(RetData_lock , PaddedMutex , safepoint); 263 MUTEX_DEFN(Terminator_lock , PaddedMonitor, safepoint, true); 264 MUTEX_DEFN(InitCompleted_lock , PaddedMonitor, nosafepoint); 265 MUTEX_DEFN(Notify_lock , PaddedMonitor, safepoint, true); 266 267 MUTEX_DEFN(JfieldIdCreation_lock , PaddedMutex , safepoint); 268 269 MUTEX_DEFN(CompiledIC_lock , PaddedMutex , nosafepoint); // locks VtableStubs_lock 270 MUTEX_DEFN(MethodCompileQueue_lock , PaddedMonitor, safepoint); 271 if (UseGlobalCompileQueueLock) { 272 MethodCompileQueueC1_lock = MethodCompileQueue_lock; 273 MethodCompileQueueC2_lock = MethodCompileQueue_lock; 274 MethodCompileQueueC3_lock = MethodCompileQueue_lock; 275 MethodCompileQueueSC1_lock = MethodCompileQueue_lock; 276 MethodCompileQueueSC2_lock = MethodCompileQueue_lock; 277 } else { 278 MUTEX_DEFN(MethodCompileQueueC1_lock , PaddedMonitor, safepoint); 279 MUTEX_DEFN(MethodCompileQueueC2_lock , PaddedMonitor, safepoint); 280 MUTEX_DEFN(MethodCompileQueueC3_lock , PaddedMonitor, safepoint); 281 MUTEX_DEFN(MethodCompileQueueSC1_lock , PaddedMonitor, safepoint); 282 MUTEX_DEFN(MethodCompileQueueSC2_lock , PaddedMonitor, safepoint); 283 } 284 MUTEX_DEFL(TrainingData_lock , PaddedMutex , MethodCompileQueue_lock); 285 MUTEX_DEFN(TrainingReplayQueue_lock , PaddedMonitor, safepoint); 286 MUTEX_DEFN(CompileStatistics_lock , PaddedMutex , safepoint); 287 MUTEX_DEFN(DirectivesStack_lock , PaddedMutex , nosafepoint); 288 289 MUTEX_DEFN(JvmtiVTMSTransition_lock , PaddedMonitor, safepoint); // used for Virtual Thread Mount State transition management 290 MUTEX_DEFN(JvmtiVThreadSuspend_lock , PaddedMutex, nosafepoint-1); 291 MUTEX_DEFN(EscapeBarrier_lock , PaddedMonitor, nosafepoint); // Used to synchronize object reallocation/relocking triggered by JVMTI 292 MUTEX_DEFN(Management_lock , PaddedMutex , safepoint); // used for JVM management 293 294 MUTEX_DEFN(ConcurrentGCBreakpoints_lock , PaddedMonitor, safepoint, true); 295 MUTEX_DEFN(TouchedMethodLog_lock , PaddedMutex , safepoint); 296 297 MUTEX_DEFN(CompileThread_lock , PaddedMonitor, safepoint); 298 MUTEX_DEFN(PeriodicTask_lock , PaddedMonitor, safepoint, true); 299 MUTEX_DEFN(RedefineClasses_lock , PaddedMonitor, safepoint); 300 MUTEX_DEFN(Verify_lock , PaddedMutex , safepoint); 301 MUTEX_DEFN(ClassLoaderDataGraph_lock , PaddedMutex , safepoint); 302 303 MUTEX_DEFN(Compilation_lock , PaddedMonitor, nosafepoint); 304 305 #if INCLUDE_JFR 306 MUTEX_DEFN(JfrBuffer_lock , PaddedMutex , event); 307 MUTEX_DEFN(JfrMsg_lock , PaddedMonitor, event); 308 MUTEX_DEFN(JfrStacktrace_lock , PaddedMutex , event); 309 #endif 310 311 MUTEX_DEFN(ContinuationRelativize_lock , PaddedMonitor, nosafepoint-3); 312 MUTEX_DEFN(CodeHeapStateAnalytics_lock , PaddedMutex , safepoint); 313 MUTEX_DEFN(ThreadsSMRDelete_lock , PaddedMonitor, service-2); // Holds ConcurrentHashTableResize_lock 314 MUTEX_DEFN(ThreadIdTableCreate_lock , PaddedMutex , safepoint); 315 MUTEX_DEFN(DCmdFactory_lock , PaddedMutex , nosafepoint); 316 MUTEX_DEFN(NMTQuery_lock , PaddedMutex , safepoint); 317 MUTEX_DEFN(NMTCompilationCostHistory_lock , PaddedMutex , nosafepoint); 318 MUTEX_DEFN(NmtVirtualMemory_lock , PaddedMutex , service-4); // Must be lower than G1Mapper_lock used from G1RegionsSmallerThanCommitSizeMapper::commit_regions 319 #if INCLUDE_CDS 320 #if INCLUDE_JVMTI 321 MUTEX_DEFN(CDSClassFileStream_lock , PaddedMutex , safepoint); 322 #endif 323 MUTEX_DEFN(DumpTimeTable_lock , PaddedMutex , nosafepoint); 324 MUTEX_DEFN(CDSLambda_lock , PaddedMutex , nosafepoint); 325 MUTEX_DEFN(DumpRegion_lock , PaddedMutex , nosafepoint); 326 MUTEX_DEFN(ClassListFile_lock , PaddedMutex , nosafepoint); 327 MUTEX_DEFN(UnregisteredClassesTable_lock , PaddedMutex , nosafepoint-1); 328 MUTEX_DEFN(LambdaFormInvokers_lock , PaddedMutex , safepoint); 329 MUTEX_DEFN(ScratchObjects_lock , PaddedMutex , nosafepoint-1); // Holds DumpTimeTable_lock 330 MUTEX_DEFN(ArchivedObjectTables_lock , PaddedMutex , nosafepoint); 331 MUTEX_DEFN(FinalImageRecipes_lock , PaddedMutex , nosafepoint); 332 #endif // INCLUDE_CDS 333 MUTEX_DEFN(Bootclasspath_lock , PaddedMutex , nosafepoint); 334 335 #if INCLUDE_JVMCI 336 // JVMCIRuntime::_lock must be acquired before JVMCI_lock to avoid deadlock 337 MUTEX_DEFN(JVMCIRuntime_lock , PaddedMonitor, safepoint, true); 338 #endif 339 340 MUTEX_DEFN(ThreadsLockThrottle_lock , PaddedMonitor, safepoint); 341 342 // These locks have relative rankings, and inherit safepoint checking attributes from that rank. 343 MUTEX_DEFL(VtableStubs_lock , PaddedMutex , CompiledIC_lock); // Also holds DumpTimeTable_lock 344 MUTEX_DEFL(CodeCache_lock , PaddedMonitor, VtableStubs_lock); 345 MUTEX_DEFL(NMethodState_lock , PaddedMutex , CodeCache_lock); 346 347 // tty_lock is held when printing nmethod and its relocations which use this lock. 348 MUTEX_DEFL(ExternalsRecorder_lock , PaddedMutex , tty_lock); 349 350 MUTEX_DEFL(AOTCodeCStrings_lock , PaddedMutex , tty_lock); 351 352 MUTEX_DEFL(Threads_lock , PaddedMonitor, CompileThread_lock, true); 353 MUTEX_DEFL(Compile_lock , PaddedMutex , MethodCompileQueue_lock); 354 MUTEX_DEFL(JNICritical_lock , PaddedMonitor, AdapterHandlerLibrary_lock); // used for JNI critical regions 355 MUTEX_DEFL(Heap_lock , PaddedMonitor, TrainingData_lock /*JNICritical_lock*/); 356 357 MUTEX_DEFL(PerfDataMemAlloc_lock , PaddedMutex , Heap_lock); 358 MUTEX_DEFL(PerfDataManager_lock , PaddedMutex , Heap_lock); 359 MUTEX_DEFL(VMOperation_lock , PaddedMonitor, Heap_lock, true); 360 MUTEX_DEFL(ClassInitError_lock , PaddedMonitor, Threads_lock); 361 362 if (UseG1GC) { 363 MUTEX_DEFL(G1OldGCCount_lock , PaddedMonitor, Threads_lock, true); 364 MUTEX_DEFL(G1RareEvent_lock , PaddedMutex , Threads_lock, true); 365 } 366 367 MUTEX_DEFL(CompileTaskAlloc_lock , PaddedMutex, MethodCompileQueue_lock); 368 MUTEX_DEFL(CompileTaskWait_lock , PaddedMonitor, MethodCompileQueue_lock); 369 370 #if INCLUDE_PARALLELGC 371 if (UseParallelGC) { 372 MUTEX_DEFL(PSOldGenExpand_lock , PaddedMutex , Heap_lock, true); 373 } 374 #endif 375 MUTEX_DEFL(Module_lock , PaddedMutex , ClassLoaderDataGraph_lock); 376 MUTEX_DEFL(SystemDictionary_lock , PaddedMonitor, Module_lock); 377 #if INCLUDE_JVMCI 378 // JVMCIRuntime_lock must be acquired before JVMCI_lock to avoid deadlock 379 MUTEX_DEFL(JVMCI_lock , PaddedMonitor, JVMCIRuntime_lock); 380 #endif 381 MUTEX_DEFL(JvmtiThreadState_lock , PaddedMutex , JvmtiVTMSTransition_lock); // Used by JvmtiThreadState/JvmtiEventController 382 MUTEX_DEFL(SharedDecoder_lock , PaddedMutex , NmtVirtualMemory_lock); // Must be lower than NmtVirtualMemory_lock due to MemTracker::print_containing_region 383 384 // Allocate RecursiveMutex 385 MultiArray_lock = new RecursiveMutex(); 386 } 387 388 #undef MUTEX_DEFL 389 #undef MUTEX_DEFN 390 #undef MUTEX_DEF 391 #undef MUTEX_STORAGE 392 #undef MUTEX_STORAGE_NAME 393 394 static const int MAX_NAMES = 200; 395 static const char* _names[MAX_NAMES] = { nullptr }; 396 static bool _is_unique[MAX_NAMES] = { false }; 397 static int _num_names = 0; 398 399 PerfCounter** MutexLockerImpl::_perf_lock_count = nullptr; 400 PerfCounter** MutexLockerImpl::_perf_lock_wait_time = nullptr; 401 PerfCounter** MutexLockerImpl::_perf_lock_hold_time = nullptr; 402 403 MutexLockerImpl::MutexLockerImpl(Mutex* mutex, Mutex::SafepointCheckFlag flag) : 404 _mutex(mutex), 405 _prof(ProfileVMLocks && Thread::current_or_null() != nullptr && Thread::current()->profile_vm_locks()) { 406 407 bool no_safepoint_check = flag == Mutex::_no_safepoint_check_flag; 408 if (_mutex != nullptr) { 409 if (_prof) { _before.start(); } // before 410 411 if (no_safepoint_check) { 412 _mutex->lock_without_safepoint_check(); 413 } else { 414 _mutex->lock(); 415 } 416 417 if (_prof) { _before.stop(); _after.start(); } // after 418 } 419 } 420 421 MutexLockerImpl::MutexLockerImpl(Thread* thread, Mutex* mutex, Mutex::SafepointCheckFlag flag) : 422 _mutex(mutex), _prof(thread->profile_vm_locks()) { 423 424 if (_prof) { _before.start(); } // before 425 426 bool no_safepoint_check = flag == Mutex::_no_safepoint_check_flag; 427 if (_mutex != nullptr) { 428 if (no_safepoint_check) { 429 _mutex->lock_without_safepoint_check(thread); 430 } else { 431 _mutex->lock(thread); 432 } 433 } 434 435 if (_prof) { _before.stop(); _after.start(); } // after 436 } 437 438 void MutexLockerImpl::init_counters() { 439 if (ProfileVMLocks && UsePerfData) { 440 ResourceMark rm; 441 EXCEPTION_MARK; 442 _perf_lock_count = NEW_C_HEAP_ARRAY(PerfCounter*, MAX_NAMES + 1, mtInternal); 443 _perf_lock_wait_time = NEW_C_HEAP_ARRAY(PerfCounter*, MAX_NAMES + 1, mtInternal); 444 _perf_lock_hold_time = NEW_C_HEAP_ARRAY(PerfCounter*, MAX_NAMES + 1, mtInternal); 445 446 NEWPERFEVENTCOUNTER(_perf_lock_count[0], SUN_RT, PerfDataManager::counter_name("Other", "Count")); 447 NEWPERFEVENTCOUNTER(_perf_lock_wait_time[0], SUN_RT, PerfDataManager::counter_name("Other", "BeforeTime")); 448 NEWPERFEVENTCOUNTER(_perf_lock_hold_time[0], SUN_RT, PerfDataManager::counter_name("Other", "AfterTime")); 449 for (int i = 0; i < MAX_NAMES; i++) { 450 ResourceMark rm; 451 const char* counter_name = _names[i]; 452 if (counter_name == nullptr) { 453 stringStream ss; 454 ss.print("UnnamedMutex#%d", i); 455 counter_name = ss.as_string(); 456 } 457 NEWPERFEVENTCOUNTER(_perf_lock_count[i + 1], SUN_RT, PerfDataManager::counter_name(counter_name, "Count")); 458 NEWPERFEVENTCOUNTER(_perf_lock_wait_time[i + 1], SUN_RT, PerfDataManager::counter_name(counter_name, "BeforeTime")); 459 NEWPERFEVENTCOUNTER(_perf_lock_hold_time[i + 1], SUN_RT, PerfDataManager::counter_name(counter_name, "AfterTime")); 460 } 461 if (HAS_PENDING_EXCEPTION) { 462 vm_exit_during_initialization("MutexLockerImpl::init_counters() failed unexpectedly"); 463 } 464 } 465 } 466 467 int MutexLockerImpl::name2id(const char* name) { 468 if (ProfileVMLocks && UsePerfData) { 469 for (int i = 0; i < _num_names; i++) { 470 if (strcmp(_names[i], name) == 0) { 471 _is_unique[i] = false; 472 return i; 473 } 474 } 475 if (_num_names < MAX_NAMES) { 476 int new_id = _num_names++; 477 _names[new_id] = os::strdup(name, mtInternal); 478 _is_unique[new_id] = true; 479 return new_id; 480 } 481 log_debug(init)("Unnamed: %s", name); // no slots left 482 } 483 return -1; 484 } 485 486 void MutexLockerImpl::print_counter_on(outputStream* st, const char* name, bool is_unique, int idx) { 487 jlong count = _perf_lock_count[idx]->get_value(); 488 if (count > 0) { 489 st->print_cr(" %3d: %s%40s = " JLONG_FORMAT_W(5) "us (" JLONG_FORMAT_W(5) "us) / " JLONG_FORMAT_W(9) " events", 490 idx, (is_unique ? " " : "M"), name, 491 Management::ticks_to_us(_perf_lock_hold_time[idx]->get_value()), 492 Management::ticks_to_us(_perf_lock_wait_time[idx]->get_value()), 493 count); 494 } 495 } 496 497 static jlong accumulate_lock_counters(PerfCounter** lock_counters) { 498 jlong acc = 0; 499 for (int i = 0; i < _num_names + 1; i++) { // 0 slot is reserved for unnamed locks 500 if (lock_counters[i] == nullptr) { 501 break; 502 } 503 acc += lock_counters[i]->get_value(); 504 } 505 return acc; 506 } 507 508 void MutexLockerImpl::print_counters_on(outputStream* st) { 509 if (ProfileVMLocks && UsePerfData) { 510 jlong total_count = accumulate_lock_counters(_perf_lock_count); 511 jlong total_wait_time = accumulate_lock_counters(_perf_lock_wait_time); 512 jlong total_hold_time = accumulate_lock_counters(_perf_lock_hold_time); 513 514 st->print_cr("MutexLocker: Total: %d named locks (%d unique names); hold = " JLONG_FORMAT "us (wait = " JLONG_FORMAT "us) / " JLONG_FORMAT " events for thread \"main\"", 515 Mutex::num_mutex(), _num_names, 516 Management::ticks_to_us(total_hold_time), 517 Management::ticks_to_us(total_wait_time), 518 total_count); 519 for (int i = 0; i < _num_names; i++) { 520 print_counter_on(st, _names[i], _is_unique[i], i+1); 521 } 522 print_counter_on(st, "Unnamed / Other", false /*is_unique*/, 0); 523 } else { 524 st->print_cr("MutexLocker: no info (%s is disabled)", (UsePerfData ? "ProfileVMLocks" : "UsePerfData")); 525 } 526 } 527 528 void MutexLockerImpl::post_initialize() { 529 // Print mutex ranks if requested. 530 LogTarget(Info, vmmutex) lt; 531 if (lt.is_enabled()) { 532 ResourceMark rm; 533 LogStream ls(lt); 534 Mutex::print_lock_ranks(&ls); 535 } 536 } 537 538 GCMutexLocker::GCMutexLocker(Mutex* mutex) { 539 if (SafepointSynchronize::is_at_safepoint()) { 540 _locked = false; 541 } else { 542 _mutex = mutex; 543 _locked = true; 544 _mutex->lock(); 545 } 546 }