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src/hotspot/share/runtime/mutexLocker.cpp

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  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 "gc/shared/gc_globals.hpp"
 26 #include "logging/log.hpp"
 27 #include "logging/logStream.hpp"
 28 #include "memory/resourceArea.hpp"
 29 #include "memory/universe.hpp"

 30 #include "runtime/javaThread.hpp"
 31 #include "runtime/mutexLocker.hpp"
 32 #include "runtime/safepoint.hpp"
 33 #include "runtime/vmThread.hpp"

 34 #include "utilities/vmError.hpp"
 35 
 36 // Mutexes used in the VM (see comment in mutexLocker.hpp):
 37 
 38 Mutex*   NMethodState_lock            = nullptr;
 39 Monitor* SystemDictionary_lock        = nullptr;
 40 Mutex*   InvokeMethodTypeTable_lock   = nullptr;
 41 Monitor* InvokeMethodIntrinsicTable_lock = nullptr;
 42 Mutex*   SharedDictionary_lock        = nullptr;
 43 Monitor* ClassInitError_lock          = nullptr;
 44 Mutex*   Module_lock                  = nullptr;
 45 Mutex*   CompiledIC_lock              = nullptr;
 46 Mutex*   VMStatistic_lock             = nullptr;
 47 Mutex*   JmethodIdCreation_lock       = nullptr;
 48 Mutex*   JfieldIdCreation_lock        = nullptr;
 49 Monitor* JNICritical_lock             = nullptr;
 50 Mutex*   JvmtiThreadState_lock        = nullptr;
 51 Monitor* EscapeBarrier_lock           = nullptr;
 52 Monitor* JvmtiVTMSTransition_lock     = nullptr;
 53 Mutex*   JvmtiVThreadSuspend_lock     = nullptr;

 63 Mutex*   StringDedupIntern_lock       = nullptr;
 64 Monitor* CodeCache_lock               = nullptr;
 65 Mutex*   TouchedMethodLog_lock        = nullptr;
 66 Mutex*   RetData_lock                 = nullptr;
 67 Monitor* VMOperation_lock             = nullptr;
 68 Monitor* ThreadsLockThrottle_lock     = nullptr;
 69 Monitor* Threads_lock                 = nullptr;
 70 Mutex*   NonJavaThreadsList_lock      = nullptr;
 71 Mutex*   NonJavaThreadsListSync_lock  = nullptr;
 72 Monitor* CGC_lock                     = nullptr;
 73 Monitor* STS_lock                     = nullptr;
 74 Monitor* G1OldGCCount_lock            = nullptr;
 75 Mutex*   G1RareEvent_lock             = nullptr;
 76 Mutex*   G1DetachedRefinementStats_lock = nullptr;
 77 Mutex*   MarkStackFreeList_lock       = nullptr;
 78 Mutex*   MarkStackChunkList_lock      = nullptr;
 79 Mutex*   MonitoringSupport_lock       = nullptr;
 80 Monitor* ConcurrentGCBreakpoints_lock = nullptr;
 81 Mutex*   Compile_lock                 = nullptr;
 82 Monitor* MethodCompileQueue_lock      = nullptr;





 83 Monitor* CompileThread_lock           = nullptr;
 84 Monitor* Compilation_lock             = nullptr;
 85 Mutex*   CompileTaskAlloc_lock        = nullptr;
 86 Mutex*   CompileStatistics_lock       = nullptr;
 87 Mutex*   DirectivesStack_lock         = nullptr;
 88 Monitor* Terminator_lock              = nullptr;
 89 Monitor* InitCompleted_lock           = nullptr;
 90 Monitor* BeforeExit_lock              = nullptr;
 91 Monitor* Notify_lock                  = nullptr;
 92 Mutex*   ExceptionCache_lock          = nullptr;
 93 Mutex*   TrainingData_lock            = nullptr;
 94 Monitor* TrainingReplayQueue_lock     = nullptr;
 95 #ifndef PRODUCT
 96 Mutex*   FullGCALot_lock              = nullptr;
 97 #endif
 98 
 99 Mutex*   tty_lock                     = nullptr;
100 
101 Mutex*   RawMonitor_lock              = nullptr;
102 Mutex*   PerfDataMemAlloc_lock        = nullptr;
103 Mutex*   PerfDataManager_lock         = nullptr;
104 
105 Mutex*   FreeList_lock                = nullptr;

134 Mutex*   ClassLoaderDataGraph_lock    = nullptr;
135 Monitor* ThreadsSMRDelete_lock        = nullptr;
136 Mutex*   ThreadIdTableCreate_lock     = nullptr;
137 Mutex*   SharedDecoder_lock           = nullptr;
138 Mutex*   DCmdFactory_lock             = nullptr;
139 Mutex*   NMTQuery_lock                = nullptr;
140 Mutex*   NMTCompilationCostHistory_lock = nullptr;
141 Mutex*   NmtVirtualMemory_lock          = nullptr;
142 
143 #if INCLUDE_CDS
144 #if INCLUDE_JVMTI
145 Mutex*   CDSClassFileStream_lock      = nullptr;
146 #endif
147 Mutex*   DumpTimeTable_lock           = nullptr;
148 Mutex*   CDSLambda_lock               = nullptr;
149 Mutex*   DumpRegion_lock              = nullptr;
150 Mutex*   ClassListFile_lock           = nullptr;
151 Mutex*   UnregisteredClassesTable_lock= nullptr;
152 Mutex*   LambdaFormInvokers_lock      = nullptr;
153 Mutex*   ScratchObjects_lock          = nullptr;

154 Mutex*   FinalImageRecipes_lock       = nullptr;
155 #endif // INCLUDE_CDS
156 Mutex*   Bootclasspath_lock           = nullptr;
157 
158 #if INCLUDE_JVMCI
159 Monitor* JVMCI_lock                   = nullptr;
160 Monitor* JVMCIRuntime_lock            = nullptr;
161 #endif
162 
163 // Only one RecursiveMutex
164 RecursiveMutex* MultiArray_lock       = nullptr;
165 
166 #ifdef ASSERT
167 void assert_locked_or_safepoint(const Mutex* lock) {
168   if (DebuggingContext::is_enabled() || VMError::is_error_reported()) return;
169   // check if this thread owns the lock (common case)
170   assert(lock != nullptr, "Need non-null lock");
171   if (lock->owned_by_self()) return;
172   if (SafepointSynchronize::is_at_safepoint()) return;
173   if (!Universe::is_fully_initialized()) return;

241   MUTEX_DEFN(SignatureHandlerLibrary_lock    , PaddedMutex  , safepoint);
242   MUTEX_DEFN(SymbolArena_lock                , PaddedMutex  , nosafepoint);
243   MUTEX_DEFN(ExceptionCache_lock             , PaddedMutex  , safepoint);
244 #ifndef PRODUCT
245   MUTEX_DEFN(FullGCALot_lock                 , PaddedMutex  , safepoint); // a lock to make FullGCALot MT safe
246 #endif
247   MUTEX_DEFN(BeforeExit_lock                 , PaddedMonitor, safepoint);
248 
249   MUTEX_DEFN(NonJavaThreadsList_lock         , PaddedMutex  , nosafepoint-1);
250   MUTEX_DEFN(NonJavaThreadsListSync_lock     , PaddedMutex  , nosafepoint);
251 
252   MUTEX_DEFN(RetData_lock                    , PaddedMutex  , safepoint);
253   MUTEX_DEFN(Terminator_lock                 , PaddedMonitor, safepoint, true);
254   MUTEX_DEFN(InitCompleted_lock              , PaddedMonitor, nosafepoint);
255   MUTEX_DEFN(Notify_lock                     , PaddedMonitor, safepoint, true);
256 
257   MUTEX_DEFN(JfieldIdCreation_lock           , PaddedMutex  , safepoint);
258 
259   MUTEX_DEFN(CompiledIC_lock                 , PaddedMutex  , nosafepoint);  // locks VtableStubs_lock
260   MUTEX_DEFN(MethodCompileQueue_lock         , PaddedMonitor, safepoint);













261   MUTEX_DEFL(TrainingData_lock               , PaddedMutex  , MethodCompileQueue_lock);
262   MUTEX_DEFN(TrainingReplayQueue_lock        , PaddedMonitor, safepoint);
263   MUTEX_DEFN(CompileStatistics_lock          , PaddedMutex  , safepoint);
264   MUTEX_DEFN(DirectivesStack_lock            , PaddedMutex  , nosafepoint);
265 
266   MUTEX_DEFN(JvmtiVTMSTransition_lock        , PaddedMonitor, safepoint);   // used for Virtual Thread Mount State transition management
267   MUTEX_DEFN(JvmtiVThreadSuspend_lock        , PaddedMutex,   nosafepoint-1);
268   MUTEX_DEFN(EscapeBarrier_lock              , PaddedMonitor, nosafepoint); // Used to synchronize object reallocation/relocking triggered by JVMTI
269   MUTEX_DEFN(Management_lock                 , PaddedMutex  , safepoint);   // used for JVM management
270 
271   MUTEX_DEFN(ConcurrentGCBreakpoints_lock    , PaddedMonitor, safepoint, true);
272   MUTEX_DEFN(TouchedMethodLog_lock           , PaddedMutex  , safepoint);
273 
274   MUTEX_DEFN(CompileThread_lock              , PaddedMonitor, safepoint);
275   MUTEX_DEFN(PeriodicTask_lock               , PaddedMonitor, safepoint, true);
276   MUTEX_DEFN(RedefineClasses_lock            , PaddedMonitor, safepoint);
277   MUTEX_DEFN(Verify_lock                     , PaddedMutex  , safepoint);
278   MUTEX_DEFN(ClassLoaderDataGraph_lock       , PaddedMutex  , safepoint);
279 
280   if (WhiteBoxAPI) {
281     MUTEX_DEFN(Compilation_lock              , PaddedMonitor, nosafepoint);
282   }
283 
284 #if INCLUDE_JFR
285   MUTEX_DEFN(JfrBuffer_lock                  , PaddedMutex  , event);
286   MUTEX_DEFN(JfrMsg_lock                     , PaddedMonitor, event);
287   MUTEX_DEFN(JfrStacktrace_lock              , PaddedMutex  , event);
288 #endif
289 
290   MUTEX_DEFN(ContinuationRelativize_lock     , PaddedMonitor, nosafepoint-3);
291   MUTEX_DEFN(CodeHeapStateAnalytics_lock     , PaddedMutex  , safepoint);
292   MUTEX_DEFN(ThreadsSMRDelete_lock           , PaddedMonitor, service-2); // Holds ConcurrentHashTableResize_lock
293   MUTEX_DEFN(ThreadIdTableCreate_lock        , PaddedMutex  , safepoint);
294   MUTEX_DEFN(DCmdFactory_lock                , PaddedMutex  , nosafepoint);
295   MUTEX_DEFN(NMTQuery_lock                   , PaddedMutex  , safepoint);
296   MUTEX_DEFN(NMTCompilationCostHistory_lock  , PaddedMutex  , nosafepoint);
297   MUTEX_DEFN(NmtVirtualMemory_lock           , PaddedMutex  , service-4); // Must be lower than G1Mapper_lock used from G1RegionsSmallerThanCommitSizeMapper::commit_regions
298 #if INCLUDE_CDS
299 #if INCLUDE_JVMTI
300   MUTEX_DEFN(CDSClassFileStream_lock         , PaddedMutex  , safepoint);
301 #endif
302   MUTEX_DEFN(DumpTimeTable_lock              , PaddedMutex  , nosafepoint);
303   MUTEX_DEFN(CDSLambda_lock                  , PaddedMutex  , nosafepoint);
304   MUTEX_DEFN(DumpRegion_lock                 , PaddedMutex  , nosafepoint);
305   MUTEX_DEFN(ClassListFile_lock              , PaddedMutex  , nosafepoint);
306   MUTEX_DEFN(UnregisteredClassesTable_lock   , PaddedMutex  , nosafepoint-1);
307   MUTEX_DEFN(LambdaFormInvokers_lock         , PaddedMutex  , safepoint);
308   MUTEX_DEFN(ScratchObjects_lock             , PaddedMutex  , nosafepoint-1); // Holds DumpTimeTable_lock

309   MUTEX_DEFN(FinalImageRecipes_lock          , PaddedMutex  , nosafepoint);
310 #endif // INCLUDE_CDS
311   MUTEX_DEFN(Bootclasspath_lock              , PaddedMutex  , nosafepoint);
312 
313 #if INCLUDE_JVMCI
314   // JVMCIRuntime::_lock must be acquired before JVMCI_lock to avoid deadlock
315   MUTEX_DEFN(JVMCIRuntime_lock               , PaddedMonitor, safepoint, true);
316 #endif
317 
318   MUTEX_DEFN(ThreadsLockThrottle_lock        , PaddedMonitor, safepoint);
319 
320   // These locks have relative rankings, and inherit safepoint checking attributes from that rank.
321   MUTEX_DEFL(VtableStubs_lock               , PaddedMutex  , CompiledIC_lock);  // Also holds DumpTimeTable_lock
322   MUTEX_DEFL(CodeCache_lock                 , PaddedMonitor, VtableStubs_lock);
323   MUTEX_DEFL(NMethodState_lock              , PaddedMutex  , CodeCache_lock);
324 
325   // tty_lock is held when printing nmethod and its relocations which use this lock.
326   MUTEX_DEFL(ExternalsRecorder_lock         , PaddedMutex  , tty_lock);
327 
328   MUTEX_DEFL(AOTCodeCStrings_lock           , PaddedMutex  , tty_lock);
329 
330   MUTEX_DEFL(Threads_lock                   , PaddedMonitor, CompileThread_lock, true);
331   MUTEX_DEFL(Compile_lock                   , PaddedMutex  , MethodCompileQueue_lock);
332   MUTEX_DEFL(JNICritical_lock               , PaddedMonitor, AdapterHandlerLibrary_lock); // used for JNI critical regions
333   MUTEX_DEFL(Heap_lock                      , PaddedMonitor, JNICritical_lock);
334 
335   MUTEX_DEFL(PerfDataMemAlloc_lock          , PaddedMutex  , Heap_lock);
336   MUTEX_DEFL(PerfDataManager_lock           , PaddedMutex  , Heap_lock);
337   MUTEX_DEFL(VMOperation_lock               , PaddedMonitor, Heap_lock, true);
338   MUTEX_DEFL(ClassInitError_lock            , PaddedMonitor, Threads_lock);
339 
340   if (UseG1GC) {
341     MUTEX_DEFL(G1OldGCCount_lock            , PaddedMonitor, Threads_lock, true);
342     MUTEX_DEFL(G1RareEvent_lock             , PaddedMutex  , Threads_lock, true);
343   }
344 
345   MUTEX_DEFL(CompileTaskAlloc_lock          , PaddedMutex  ,  MethodCompileQueue_lock);
346 #if INCLUDE_PARALLELGC
347   if (UseParallelGC) {
348     MUTEX_DEFL(PSOldGenExpand_lock          , PaddedMutex  , Heap_lock, true);
349   }
350 #endif
351   MUTEX_DEFL(Module_lock                    , PaddedMutex  ,  ClassLoaderDataGraph_lock);
352   MUTEX_DEFL(SystemDictionary_lock          , PaddedMonitor, Module_lock);
353 #if INCLUDE_JVMCI
354   // JVMCIRuntime_lock must be acquired before JVMCI_lock to avoid deadlock
355   MUTEX_DEFL(JVMCI_lock                     , PaddedMonitor, JVMCIRuntime_lock);
356 #endif
357   MUTEX_DEFL(JvmtiThreadState_lock          , PaddedMutex  , JvmtiVTMSTransition_lock);   // Used by JvmtiThreadState/JvmtiEventController
358   MUTEX_DEFL(SharedDecoder_lock             , PaddedMutex  , NmtVirtualMemory_lock); // Must be lower than NmtVirtualMemory_lock due to MemTracker::print_containing_region
359 
360   // Allocate RecursiveMutex
361   MultiArray_lock = new RecursiveMutex();
362 }
363 
364 #undef MUTEX_DEFL
365 #undef MUTEX_DEFN
366 #undef MUTEX_DEF
367 #undef MUTEX_STORAGE
368 #undef MUTEX_STORAGE_NAME
369 






































































































































370 void MutexLockerImpl::post_initialize() {
371   // Print mutex ranks if requested.
372   LogTarget(Info, vmmutex) lt;
373   if (lt.is_enabled()) {
374     ResourceMark rm;
375     LogStream ls(lt);
376     Mutex::print_lock_ranks(&ls);
377   }
378 }
379 
380 GCMutexLocker::GCMutexLocker(Mutex* mutex) {
381   if (SafepointSynchronize::is_at_safepoint()) {
382     _locked = false;
383   } else {
384     _mutex = mutex;
385     _locked = true;
386     _mutex->lock();
387   }
388 }

  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;

 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* MethodCompileQueue_lock      = nullptr;
 86 Monitor* MethodCompileQueueC1_lock    = nullptr;
 87 Monitor* MethodCompileQueueC2_lock    = nullptr;
 88 Monitor* MethodCompileQueueC3_lock    = nullptr;
 89 Monitor* MethodCompileQueueSC1_lock   = nullptr;
 90 Monitor* MethodCompileQueueSC2_lock   = nullptr;
 91 Monitor* CompileThread_lock           = nullptr;
 92 Monitor* Compilation_lock             = nullptr;
 93 Monitor* CompileTaskAlloc_lock        = nullptr;
 94 Mutex*   CompileStatistics_lock       = nullptr;
 95 Mutex*   DirectivesStack_lock         = nullptr;
 96 Monitor* Terminator_lock              = nullptr;
 97 Monitor* InitCompleted_lock           = nullptr;
 98 Monitor* BeforeExit_lock              = nullptr;
 99 Monitor* Notify_lock                  = nullptr;
100 Mutex*   ExceptionCache_lock          = nullptr;
101 Mutex*   TrainingData_lock            = nullptr;
102 Monitor* TrainingReplayQueue_lock     = nullptr;
103 #ifndef PRODUCT
104 Mutex*   FullGCALot_lock              = nullptr;
105 #endif
106 
107 Mutex*   tty_lock                     = nullptr;
108 
109 Mutex*   RawMonitor_lock              = nullptr;
110 Mutex*   PerfDataMemAlloc_lock        = nullptr;
111 Mutex*   PerfDataManager_lock         = nullptr;
112 
113 Mutex*   FreeList_lock                = nullptr;

142 Mutex*   ClassLoaderDataGraph_lock    = nullptr;
143 Monitor* ThreadsSMRDelete_lock        = nullptr;
144 Mutex*   ThreadIdTableCreate_lock     = nullptr;
145 Mutex*   SharedDecoder_lock           = nullptr;
146 Mutex*   DCmdFactory_lock             = nullptr;
147 Mutex*   NMTQuery_lock                = nullptr;
148 Mutex*   NMTCompilationCostHistory_lock = nullptr;
149 Mutex*   NmtVirtualMemory_lock          = nullptr;
150 
151 #if INCLUDE_CDS
152 #if INCLUDE_JVMTI
153 Mutex*   CDSClassFileStream_lock      = nullptr;
154 #endif
155 Mutex*   DumpTimeTable_lock           = nullptr;
156 Mutex*   CDSLambda_lock               = nullptr;
157 Mutex*   DumpRegion_lock              = nullptr;
158 Mutex*   ClassListFile_lock           = nullptr;
159 Mutex*   UnregisteredClassesTable_lock= nullptr;
160 Mutex*   LambdaFormInvokers_lock      = nullptr;
161 Mutex*   ScratchObjects_lock          = nullptr;
162 Mutex*   ArchivedObjectTables_lock    = nullptr;
163 Mutex*   FinalImageRecipes_lock       = nullptr;
164 #endif // INCLUDE_CDS
165 Mutex*   Bootclasspath_lock           = nullptr;
166 
167 #if INCLUDE_JVMCI
168 Monitor* JVMCI_lock                   = nullptr;
169 Monitor* JVMCIRuntime_lock            = nullptr;
170 #endif
171 
172 // Only one RecursiveMutex
173 RecursiveMutex* MultiArray_lock       = nullptr;
174 
175 #ifdef ASSERT
176 void assert_locked_or_safepoint(const Mutex* lock) {
177   if (DebuggingContext::is_enabled() || VMError::is_error_reported()) return;
178   // check if this thread owns the lock (common case)
179   assert(lock != nullptr, "Need non-null lock");
180   if (lock->owned_by_self()) return;
181   if (SafepointSynchronize::is_at_safepoint()) return;
182   if (!Universe::is_fully_initialized()) return;

250   MUTEX_DEFN(SignatureHandlerLibrary_lock    , PaddedMutex  , safepoint);
251   MUTEX_DEFN(SymbolArena_lock                , PaddedMutex  , nosafepoint);
252   MUTEX_DEFN(ExceptionCache_lock             , PaddedMutex  , safepoint);
253 #ifndef PRODUCT
254   MUTEX_DEFN(FullGCALot_lock                 , PaddedMutex  , safepoint); // a lock to make FullGCALot MT safe
255 #endif
256   MUTEX_DEFN(BeforeExit_lock                 , PaddedMonitor, safepoint);
257 
258   MUTEX_DEFN(NonJavaThreadsList_lock         , PaddedMutex  , nosafepoint-1);
259   MUTEX_DEFN(NonJavaThreadsListSync_lock     , PaddedMutex  , nosafepoint);
260 
261   MUTEX_DEFN(RetData_lock                    , PaddedMutex  , safepoint);
262   MUTEX_DEFN(Terminator_lock                 , PaddedMonitor, safepoint, true);
263   MUTEX_DEFN(InitCompleted_lock              , PaddedMonitor, nosafepoint);
264   MUTEX_DEFN(Notify_lock                     , PaddedMonitor, safepoint, true);
265 
266   MUTEX_DEFN(JfieldIdCreation_lock           , PaddedMutex  , safepoint);
267 
268   MUTEX_DEFN(CompiledIC_lock                 , PaddedMutex  , nosafepoint);  // locks VtableStubs_lock
269   MUTEX_DEFN(MethodCompileQueue_lock         , PaddedMonitor, safepoint);
270   if (UseGlobalCompileQueueLock) {
271     MethodCompileQueueC1_lock  = MethodCompileQueue_lock;
272     MethodCompileQueueC2_lock  = MethodCompileQueue_lock;
273     MethodCompileQueueC3_lock  = MethodCompileQueue_lock;
274     MethodCompileQueueSC1_lock = MethodCompileQueue_lock;
275     MethodCompileQueueSC2_lock = MethodCompileQueue_lock;
276   } else {
277     MUTEX_DEFN(MethodCompileQueueC1_lock     , PaddedMonitor, safepoint);
278     MUTEX_DEFN(MethodCompileQueueC2_lock     , PaddedMonitor, safepoint);
279     MUTEX_DEFN(MethodCompileQueueC3_lock     , PaddedMonitor, safepoint);
280     MUTEX_DEFN(MethodCompileQueueSC1_lock    , PaddedMonitor, safepoint);
281     MUTEX_DEFN(MethodCompileQueueSC2_lock    , PaddedMonitor, safepoint);
282   }
283   MUTEX_DEFL(TrainingData_lock               , PaddedMutex  , MethodCompileQueue_lock);
284   MUTEX_DEFN(TrainingReplayQueue_lock        , PaddedMonitor, safepoint);
285   MUTEX_DEFN(CompileStatistics_lock          , PaddedMutex  , safepoint);
286   MUTEX_DEFN(DirectivesStack_lock            , PaddedMutex  , nosafepoint);
287 
288   MUTEX_DEFN(JvmtiVTMSTransition_lock        , PaddedMonitor, safepoint);   // used for Virtual Thread Mount State transition management
289   MUTEX_DEFN(JvmtiVThreadSuspend_lock        , PaddedMutex,   nosafepoint-1);
290   MUTEX_DEFN(EscapeBarrier_lock              , PaddedMonitor, nosafepoint); // Used to synchronize object reallocation/relocking triggered by JVMTI
291   MUTEX_DEFN(Management_lock                 , PaddedMutex  , safepoint);   // used for JVM management
292 
293   MUTEX_DEFN(ConcurrentGCBreakpoints_lock    , PaddedMonitor, safepoint, true);
294   MUTEX_DEFN(TouchedMethodLog_lock           , PaddedMutex  , safepoint);
295 
296   MUTEX_DEFN(CompileThread_lock              , PaddedMonitor, safepoint);
297   MUTEX_DEFN(PeriodicTask_lock               , PaddedMonitor, safepoint, true);
298   MUTEX_DEFN(RedefineClasses_lock            , PaddedMonitor, safepoint);
299   MUTEX_DEFN(Verify_lock                     , PaddedMutex  , safepoint);
300   MUTEX_DEFN(ClassLoaderDataGraph_lock       , PaddedMutex  , safepoint);
301 
302   MUTEX_DEFN(Compilation_lock                , PaddedMonitor, nosafepoint);


303 
304 #if INCLUDE_JFR
305   MUTEX_DEFN(JfrBuffer_lock                  , PaddedMutex  , event);
306   MUTEX_DEFN(JfrMsg_lock                     , PaddedMonitor, event);
307   MUTEX_DEFN(JfrStacktrace_lock              , PaddedMutex  , event);
308 #endif
309 
310   MUTEX_DEFN(ContinuationRelativize_lock     , PaddedMonitor, nosafepoint-3);
311   MUTEX_DEFN(CodeHeapStateAnalytics_lock     , PaddedMutex  , safepoint);
312   MUTEX_DEFN(ThreadsSMRDelete_lock           , PaddedMonitor, service-2); // Holds ConcurrentHashTableResize_lock
313   MUTEX_DEFN(ThreadIdTableCreate_lock        , PaddedMutex  , safepoint);
314   MUTEX_DEFN(DCmdFactory_lock                , PaddedMutex  , nosafepoint);
315   MUTEX_DEFN(NMTQuery_lock                   , PaddedMutex  , safepoint);
316   MUTEX_DEFN(NMTCompilationCostHistory_lock  , PaddedMutex  , nosafepoint);
317   MUTEX_DEFN(NmtVirtualMemory_lock           , PaddedMutex  , service-4); // Must be lower than G1Mapper_lock used from G1RegionsSmallerThanCommitSizeMapper::commit_regions
318 #if INCLUDE_CDS
319 #if INCLUDE_JVMTI
320   MUTEX_DEFN(CDSClassFileStream_lock         , PaddedMutex  , safepoint);
321 #endif
322   MUTEX_DEFN(DumpTimeTable_lock              , PaddedMutex  , nosafepoint);
323   MUTEX_DEFN(CDSLambda_lock                  , PaddedMutex  , nosafepoint);
324   MUTEX_DEFN(DumpRegion_lock                 , PaddedMutex  , nosafepoint);
325   MUTEX_DEFN(ClassListFile_lock              , PaddedMutex  , nosafepoint);
326   MUTEX_DEFN(UnregisteredClassesTable_lock   , PaddedMutex  , nosafepoint-1);
327   MUTEX_DEFN(LambdaFormInvokers_lock         , PaddedMutex  , safepoint);
328   MUTEX_DEFN(ScratchObjects_lock             , PaddedMutex  , nosafepoint-1); // Holds DumpTimeTable_lock
329   MUTEX_DEFN(ArchivedObjectTables_lock       , PaddedMutex  , nosafepoint);
330   MUTEX_DEFN(FinalImageRecipes_lock          , PaddedMutex  , nosafepoint);
331 #endif // INCLUDE_CDS
332   MUTEX_DEFN(Bootclasspath_lock              , PaddedMutex  , nosafepoint);
333 
334 #if INCLUDE_JVMCI
335   // JVMCIRuntime::_lock must be acquired before JVMCI_lock to avoid deadlock
336   MUTEX_DEFN(JVMCIRuntime_lock               , PaddedMonitor, safepoint, true);
337 #endif
338 
339   MUTEX_DEFN(ThreadsLockThrottle_lock        , PaddedMonitor, safepoint);
340 
341   // These locks have relative rankings, and inherit safepoint checking attributes from that rank.
342   MUTEX_DEFL(VtableStubs_lock               , PaddedMutex  , CompiledIC_lock);  // Also holds DumpTimeTable_lock
343   MUTEX_DEFL(CodeCache_lock                 , PaddedMonitor, VtableStubs_lock);
344   MUTEX_DEFL(NMethodState_lock              , PaddedMutex  , CodeCache_lock);
345 
346   // tty_lock is held when printing nmethod and its relocations which use this lock.
347   MUTEX_DEFL(ExternalsRecorder_lock         , PaddedMutex  , tty_lock);
348 
349   MUTEX_DEFL(AOTCodeCStrings_lock           , PaddedMutex  , tty_lock);
350 
351   MUTEX_DEFL(Threads_lock                   , PaddedMonitor, CompileThread_lock, true);
352   MUTEX_DEFL(Compile_lock                   , PaddedMutex  , MethodCompileQueue_lock);
353   MUTEX_DEFL(JNICritical_lock               , PaddedMonitor, AdapterHandlerLibrary_lock); // used for JNI critical regions
354   MUTEX_DEFL(Heap_lock                      , PaddedMonitor, TrainingData_lock  /*JNICritical_lock*/);
355 
356   MUTEX_DEFL(PerfDataMemAlloc_lock          , PaddedMutex  , Heap_lock);
357   MUTEX_DEFL(PerfDataManager_lock           , PaddedMutex  , Heap_lock);
358   MUTEX_DEFL(VMOperation_lock               , PaddedMonitor, Heap_lock, true);
359   MUTEX_DEFL(ClassInitError_lock            , PaddedMonitor, Threads_lock);
360 
361   if (UseG1GC) {
362     MUTEX_DEFL(G1OldGCCount_lock            , PaddedMonitor, Threads_lock, true);
363     MUTEX_DEFL(G1RareEvent_lock             , PaddedMutex  , Threads_lock, true);
364   }
365 
366   MUTEX_DEFL(CompileTaskAlloc_lock          , PaddedMonitor,  MethodCompileQueue_lock);
367 #if INCLUDE_PARALLELGC
368   if (UseParallelGC) {
369     MUTEX_DEFL(PSOldGenExpand_lock          , PaddedMutex  , Heap_lock, true);
370   }
371 #endif
372   MUTEX_DEFL(Module_lock                    , PaddedMutex  ,  ClassLoaderDataGraph_lock);
373   MUTEX_DEFL(SystemDictionary_lock          , PaddedMonitor, Module_lock);
374 #if INCLUDE_JVMCI
375   // JVMCIRuntime_lock must be acquired before JVMCI_lock to avoid deadlock
376   MUTEX_DEFL(JVMCI_lock                     , PaddedMonitor, JVMCIRuntime_lock);
377 #endif
378   MUTEX_DEFL(JvmtiThreadState_lock          , PaddedMutex  , JvmtiVTMSTransition_lock);   // Used by JvmtiThreadState/JvmtiEventController
379   MUTEX_DEFL(SharedDecoder_lock             , PaddedMutex  , NmtVirtualMemory_lock); // Must be lower than NmtVirtualMemory_lock due to MemTracker::print_containing_region
380 
381   // Allocate RecursiveMutex
382   MultiArray_lock = new RecursiveMutex();
383 }
384 
385 #undef MUTEX_DEFL
386 #undef MUTEX_DEFN
387 #undef MUTEX_DEF
388 #undef MUTEX_STORAGE
389 #undef MUTEX_STORAGE_NAME
390 
391 static const int MAX_NAMES = 200;
392 static const char* _names[MAX_NAMES] = { nullptr };
393 static bool _is_unique[MAX_NAMES] = { false };
394 static int _num_names = 0;
395 
396 PerfCounter** MutexLockerImpl::_perf_lock_count     = nullptr;
397 PerfCounter** MutexLockerImpl::_perf_lock_wait_time = nullptr;
398 PerfCounter** MutexLockerImpl::_perf_lock_hold_time = nullptr;
399 
400 MutexLockerImpl::MutexLockerImpl(Mutex* mutex, Mutex::SafepointCheckFlag flag) :
401   _mutex(mutex),
402   _prof(ProfileVMLocks && Thread::current_or_null() != nullptr && Thread::current()->profile_vm_locks()) {
403 
404   bool no_safepoint_check = flag == Mutex::_no_safepoint_check_flag;
405   if (_mutex != nullptr) {
406     if (_prof) { _before.start(); } // before
407 
408     if (no_safepoint_check) {
409       _mutex->lock_without_safepoint_check();
410     } else {
411       _mutex->lock();
412     }
413 
414     if (_prof) { _before.stop(); _after.start(); } // after
415   }
416 }
417 
418 MutexLockerImpl::MutexLockerImpl(Thread* thread, Mutex* mutex, Mutex::SafepointCheckFlag flag) :
419   _mutex(mutex), _prof(thread->profile_vm_locks()) {
420 
421   if (_prof) { _before.start(); } // before
422 
423   bool no_safepoint_check = flag == Mutex::_no_safepoint_check_flag;
424   if (_mutex != nullptr) {
425     if (no_safepoint_check) {
426       _mutex->lock_without_safepoint_check(thread);
427     } else {
428       _mutex->lock(thread);
429     }
430   }
431 
432   if (_prof) { _before.stop(); _after.start(); } // after
433 }
434 
435 void MutexLockerImpl::init_counters() {
436   if (ProfileVMLocks && UsePerfData) {
437     ResourceMark rm;
438     EXCEPTION_MARK;
439     _perf_lock_count     = NEW_C_HEAP_ARRAY(PerfCounter*, MAX_NAMES + 1, mtInternal);
440     _perf_lock_wait_time = NEW_C_HEAP_ARRAY(PerfCounter*, MAX_NAMES + 1, mtInternal);
441     _perf_lock_hold_time = NEW_C_HEAP_ARRAY(PerfCounter*, MAX_NAMES + 1, mtInternal);
442 
443     NEWPERFEVENTCOUNTER(_perf_lock_count[0],     SUN_RT, PerfDataManager::counter_name("Other", "Count"));
444     NEWPERFEVENTCOUNTER(_perf_lock_wait_time[0], SUN_RT, PerfDataManager::counter_name("Other", "BeforeTime"));
445     NEWPERFEVENTCOUNTER(_perf_lock_hold_time[0], SUN_RT, PerfDataManager::counter_name("Other", "AfterTime"));
446     for (int i = 0; i < MAX_NAMES; i++) {
447       ResourceMark rm;
448       const char* counter_name = _names[i];
449       if (counter_name == nullptr) {
450         stringStream ss;
451         ss.print("UnnamedMutex#%d", i);
452         counter_name = ss.as_string();
453       }
454       NEWPERFEVENTCOUNTER(_perf_lock_count[i + 1],     SUN_RT, PerfDataManager::counter_name(counter_name, "Count"));
455       NEWPERFEVENTCOUNTER(_perf_lock_wait_time[i + 1], SUN_RT, PerfDataManager::counter_name(counter_name, "BeforeTime"));
456       NEWPERFEVENTCOUNTER(_perf_lock_hold_time[i + 1], SUN_RT, PerfDataManager::counter_name(counter_name, "AfterTime"));
457     }
458     if (HAS_PENDING_EXCEPTION) {
459       vm_exit_during_initialization("MutexLockerImpl::init_counters() failed unexpectedly");
460     }
461   }
462 }
463 
464 int MutexLockerImpl::name2id(const char* name) {
465   if (ProfileVMLocks && UsePerfData) {
466     for (int i = 0; i < _num_names; i++) {
467       if (strcmp(_names[i], name) == 0) {
468         _is_unique[i] = false;
469         return i;
470       }
471     }
472     if (_num_names < MAX_NAMES) {
473       int new_id = _num_names++;
474       _names[new_id] = os::strdup(name, mtInternal);
475       _is_unique[new_id] = true;
476       return new_id;
477     }
478     log_debug(init)("Unnamed: %s", name); // no slots left
479   }
480   return -1;
481 }
482 
483 void MutexLockerImpl::print_counter_on(outputStream* st, const char* name, bool is_unique, int idx) {
484   jlong count = _perf_lock_count[idx]->get_value();
485   if (count > 0) {
486     st->print_cr("  %3d: %s%40s = " JLONG_FORMAT_W(5) "us (" JLONG_FORMAT_W(5) "us) / " JLONG_FORMAT_W(9) " events",
487                  idx, (is_unique ? " " : "M"), name,
488                  Management::ticks_to_us(_perf_lock_hold_time[idx]->get_value()),
489                  Management::ticks_to_us(_perf_lock_wait_time[idx]->get_value()),
490                  count);
491   }
492 }
493 
494 static jlong accumulate_lock_counters(PerfCounter** lock_counters) {
495   jlong acc = 0;
496   for (int i = 0; i < _num_names + 1; i++) { // 0 slot is reserved for unnamed locks
497     if (lock_counters[i] == nullptr) {
498       break;
499     }
500     acc += lock_counters[i]->get_value();
501   }
502   return acc;
503 }
504 
505 void MutexLockerImpl::print_counters_on(outputStream* st) {
506   if (ProfileVMLocks && UsePerfData) {
507     jlong total_count     = accumulate_lock_counters(_perf_lock_count);
508     jlong total_wait_time = accumulate_lock_counters(_perf_lock_wait_time);
509     jlong total_hold_time = accumulate_lock_counters(_perf_lock_hold_time);
510 
511     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\"",
512                  Mutex::num_mutex(), _num_names,
513                  Management::ticks_to_us(total_hold_time),
514                  Management::ticks_to_us(total_wait_time),
515                  total_count);
516     for (int i = 0; i < _num_names; i++) {
517       print_counter_on(st, _names[i], _is_unique[i], i+1);
518     }
519     print_counter_on(st, "Unnamed / Other", false /*is_unique*/, 0);
520   } else {
521     st->print_cr("MutexLocker: no info (%s is disabled)", (UsePerfData ? "ProfileVMLocks" : "UsePerfData"));
522   }
523 }
524 
525 void MutexLockerImpl::post_initialize() {
526   // Print mutex ranks if requested.
527   LogTarget(Info, vmmutex) lt;
528   if (lt.is_enabled()) {
529     ResourceMark rm;
530     LogStream ls(lt);
531     Mutex::print_lock_ranks(&ls);
532   }
533 }
534 
535 GCMutexLocker::GCMutexLocker(Mutex* mutex) {
536   if (SafepointSynchronize::is_at_safepoint()) {
537     _locked = false;
538   } else {
539     _mutex = mutex;
540     _locked = true;
541     _mutex->lock();
542   }
543 }
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