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