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