1 /*
2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "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* NMethodState_lock = nullptr;
40 Monitor* SystemDictionary_lock = nullptr;
41 Mutex* InvokeMethodTypeTable_lock = nullptr;
42 Monitor* InvokeMethodIntrinsicTable_lock = nullptr;
43 Mutex* SharedDictionary_lock = nullptr;
44 Monitor* ClassInitError_lock = nullptr;
45 Mutex* Module_lock = nullptr;
46 Mutex* CompiledIC_lock = nullptr;
47 Mutex* VMStatistic_lock = nullptr;
48 Mutex* JmethodIdCreation_lock = nullptr;
49 Mutex* JfieldIdCreation_lock = nullptr;
50 Monitor* JNICritical_lock = nullptr;
51 Mutex* JvmtiThreadState_lock = nullptr;
52 Monitor* EscapeBarrier_lock = nullptr;
53 Monitor* JvmtiVTMSTransition_lock = nullptr;
54 Monitor* Heap_lock = nullptr;
55 #ifdef INCLUDE_PARALLELGC
56 Mutex* PSOldGenExpand_lock = nullptr;
57 #endif
58 Mutex* AdapterHandlerLibrary_lock = nullptr;
59 Mutex* SignatureHandlerLibrary_lock = nullptr;
60 Mutex* VtableStubs_lock = nullptr;
61 Mutex* SymbolArena_lock = nullptr;
62 Monitor* StringDedup_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 #ifndef PRODUCT
94 Mutex* FullGCALot_lock = nullptr;
95 #endif
96
97 Mutex* tty_lock = nullptr;
98
99 Mutex* RawMonitor_lock = nullptr;
100 Mutex* PerfDataMemAlloc_lock = nullptr;
101 Mutex* PerfDataManager_lock = nullptr;
102
103 Mutex* FreeList_lock = nullptr;
104 Mutex* OldSets_lock = nullptr;
105 Mutex* Uncommit_lock = nullptr;
106 Monitor* RootRegionScan_lock = nullptr;
107
108 Mutex* Management_lock = nullptr;
109 Monitor* MonitorDeflation_lock = nullptr;
110 Monitor* Service_lock = nullptr;
111 Monitor* Notification_lock = nullptr;
112 Monitor* PeriodicTask_lock = nullptr;
113 Monitor* RedefineClasses_lock = nullptr;
114 Mutex* Verify_lock = nullptr;
115
116 #if INCLUDE_JFR
117 Mutex* JfrStacktrace_lock = nullptr;
118 Monitor* JfrMsg_lock = nullptr;
119 Mutex* JfrBuffer_lock = nullptr;
120 Monitor* JfrThreadSampler_lock = nullptr;
121 #endif
122
123 Mutex* CodeHeapStateAnalytics_lock = nullptr;
124
125 Mutex* ExternalsRecorder_lock = nullptr;
126
127 Monitor* ContinuationRelativize_lock = nullptr;
128
129 Mutex* Metaspace_lock = nullptr;
130 Monitor* MetaspaceCritical_lock = nullptr;
131 Mutex* ClassLoaderDataGraph_lock = nullptr;
132 Monitor* ThreadsSMRDelete_lock = nullptr;
133 Mutex* ThreadIdTableCreate_lock = nullptr;
134 Mutex* SharedDecoder_lock = nullptr;
135 Mutex* DCmdFactory_lock = nullptr;
136 Mutex* NMTQuery_lock = nullptr;
137 Mutex* NMTCompilationCostHistory_lock = nullptr;
138
139 #if INCLUDE_CDS
140 #if INCLUDE_JVMTI
141 Mutex* CDSClassFileStream_lock = nullptr;
142 #endif
143 Mutex* DumpTimeTable_lock = nullptr;
144 Mutex* CDSLambda_lock = nullptr;
145 Mutex* DumpRegion_lock = nullptr;
146 Mutex* ClassListFile_lock = nullptr;
147 Mutex* UnregisteredClassesTable_lock= nullptr;
148 Mutex* LambdaFormInvokers_lock = nullptr;
149 Mutex* ScratchObjects_lock = nullptr;
150 #endif // INCLUDE_CDS
151 Mutex* Bootclasspath_lock = nullptr;
152
153 #if INCLUDE_JVMCI
154 Monitor* JVMCI_lock = nullptr;
155 Monitor* JVMCIRuntime_lock = nullptr;
156 #endif
157
158 // Only one RecursiveMutex
159 RecursiveMutex* MultiArray_lock = nullptr;
160
161 #ifdef ASSERT
162 void assert_locked_or_safepoint(const Mutex* lock) {
163 if (DebuggingContext::is_enabled() || VMError::is_error_reported()) return;
164 // check if this thread owns the lock (common case)
165 assert(lock != nullptr, "Need non-null lock");
166 if (lock->owned_by_self()) return;
167 if (SafepointSynchronize::is_at_safepoint()) return;
168 if (!Universe::is_fully_initialized()) return;
169 fatal("must own lock %s", lock->name());
170 }
171
172 // a stronger assertion than the above
173 void assert_lock_strong(const Mutex* lock) {
174 if (DebuggingContext::is_enabled() || VMError::is_error_reported()) return;
175 assert(lock != nullptr, "Need non-null lock");
176 if (lock->owned_by_self()) return;
177 fatal("must own lock %s", lock->name());
178 }
179 #endif
180
181 #define MUTEX_STORAGE_NAME(name) name##_storage
182 #define MUTEX_STORAGE(name, type) alignas(type) static uint8_t MUTEX_STORAGE_NAME(name)[sizeof(type)]
183 #define MUTEX_DEF(name, type, pri, ...) { \
184 assert(name == nullptr, "Mutex/Monitor initialized twice"); \
185 MUTEX_STORAGE(name, type); \
186 name = ::new(static_cast<void*>(MUTEX_STORAGE_NAME(name))) type((pri), #name, ##__VA_ARGS__); \
187 Mutex::add_mutex(name); \
188 }
189 #define MUTEX_DEFN(name, type, pri, ...) MUTEX_DEF(name, type, Mutex::pri, ##__VA_ARGS__)
190
191 // Specify relative ranked lock
192 #ifdef ASSERT
193 #define MUTEX_DEFL(name, type, held_lock, ...) MUTEX_DEF(name, type, (held_lock)->rank() - 1, ##__VA_ARGS__)
194 #else
195 #define MUTEX_DEFL(name, type, held_lock, ...) MUTEX_DEFN(name, type, safepoint, ##__VA_ARGS__)
196 #endif
197
198 // Using Padded subclasses to prevent false sharing of these global monitors and mutexes.
199 void mutex_init() {
200 MUTEX_DEFN(tty_lock , PaddedMutex , tty); // allow to lock in VM
201
202 MUTEX_DEFN(STS_lock , PaddedMonitor, nosafepoint);
203
204 if (UseG1GC) {
205 MUTEX_DEFN(CGC_lock , PaddedMonitor, nosafepoint);
206
207 MUTEX_DEFN(G1DetachedRefinementStats_lock, PaddedMutex , nosafepoint-2);
208
209 MUTEX_DEFN(FreeList_lock , PaddedMutex , service-1);
210 MUTEX_DEFN(OldSets_lock , PaddedMutex , nosafepoint);
211 MUTEX_DEFN(Uncommit_lock , PaddedMutex , service-2);
212 MUTEX_DEFN(RootRegionScan_lock , PaddedMonitor, nosafepoint-1);
213
214 MUTEX_DEFN(MarkStackFreeList_lock , PaddedMutex , nosafepoint);
215 MUTEX_DEFN(MarkStackChunkList_lock , PaddedMutex , nosafepoint);
216 }
217 MUTEX_DEFN(MonitoringSupport_lock , PaddedMutex , service-1); // used for serviceability monitoring support
218
219 MUTEX_DEFN(StringDedup_lock , PaddedMonitor, nosafepoint);
220 MUTEX_DEFN(StringDedupIntern_lock , PaddedMutex , nosafepoint);
221 MUTEX_DEFN(RawMonitor_lock , PaddedMutex , nosafepoint-1);
222
223 MUTEX_DEFN(Metaspace_lock , PaddedMutex , nosafepoint-3);
224 MUTEX_DEFN(MetaspaceCritical_lock , PaddedMonitor, nosafepoint-1);
225
226 MUTEX_DEFN(MonitorDeflation_lock , PaddedMonitor, nosafepoint); // used for monitor deflation thread operations
227 MUTEX_DEFN(Service_lock , PaddedMonitor, service); // used for service thread operations
228 MUTEX_DEFN(Notification_lock , PaddedMonitor, service); // used for notification thread operations
229
230 MUTEX_DEFN(JmethodIdCreation_lock , PaddedMutex , nosafepoint-2); // used for creating jmethodIDs.
231 MUTEX_DEFN(InvokeMethodTypeTable_lock , PaddedMutex , safepoint);
232 MUTEX_DEFN(InvokeMethodIntrinsicTable_lock , PaddedMonitor, safepoint);
233 MUTEX_DEFN(AdapterHandlerLibrary_lock , PaddedMutex , safepoint);
234 MUTEX_DEFN(SharedDictionary_lock , PaddedMutex , safepoint);
235 MUTEX_DEFN(VMStatistic_lock , PaddedMutex , safepoint);
236 MUTEX_DEFN(SignatureHandlerLibrary_lock , PaddedMutex , safepoint);
237 MUTEX_DEFN(SymbolArena_lock , PaddedMutex , nosafepoint);
238 MUTEX_DEFN(ExceptionCache_lock , PaddedMutex , safepoint);
239 #ifndef PRODUCT
240 MUTEX_DEFN(FullGCALot_lock , PaddedMutex , safepoint); // a lock to make FullGCALot MT safe
241 #endif
242 MUTEX_DEFN(BeforeExit_lock , PaddedMonitor, safepoint);
243
244 MUTEX_DEFN(NonJavaThreadsList_lock , PaddedMutex , nosafepoint-1);
245 MUTEX_DEFN(NonJavaThreadsListSync_lock , PaddedMutex , nosafepoint);
246
247 MUTEX_DEFN(RetData_lock , PaddedMutex , safepoint);
248 MUTEX_DEFN(Terminator_lock , PaddedMonitor, safepoint, true);
249 MUTEX_DEFN(InitCompleted_lock , PaddedMonitor, nosafepoint);
250 MUTEX_DEFN(Notify_lock , PaddedMonitor, safepoint, true);
251
252 MUTEX_DEFN(JfieldIdCreation_lock , PaddedMutex , safepoint);
253
254 MUTEX_DEFN(CompiledIC_lock , PaddedMutex , nosafepoint); // locks VtableStubs_lock
255 MUTEX_DEFN(MethodCompileQueue_lock , PaddedMonitor, safepoint);
256 MUTEX_DEFN(CompileStatistics_lock , PaddedMutex , safepoint);
257 MUTEX_DEFN(DirectivesStack_lock , PaddedMutex , nosafepoint);
258
259 MUTEX_DEFN(JvmtiVTMSTransition_lock , PaddedMonitor, safepoint); // used for Virtual Thread Mount State transition management
260 MUTEX_DEFN(EscapeBarrier_lock , PaddedMonitor, nosafepoint); // Used to synchronize object reallocation/relocking triggered by JVMTI
261 MUTEX_DEFN(Management_lock , PaddedMutex , safepoint); // used for JVM management
262
263 MUTEX_DEFN(ConcurrentGCBreakpoints_lock , PaddedMonitor, safepoint, true);
264 MUTEX_DEFN(TouchedMethodLog_lock , PaddedMutex , safepoint);
265
266 MUTEX_DEFN(CompileThread_lock , PaddedMonitor, safepoint);
267 MUTEX_DEFN(PeriodicTask_lock , PaddedMonitor, safepoint, true);
268 MUTEX_DEFN(RedefineClasses_lock , PaddedMonitor, safepoint);
269 MUTEX_DEFN(Verify_lock , PaddedMutex , safepoint);
270 MUTEX_DEFN(ClassLoaderDataGraph_lock , PaddedMutex , safepoint);
271
272 if (WhiteBoxAPI) {
273 MUTEX_DEFN(Compilation_lock , PaddedMonitor, nosafepoint);
274 }
275
276 #if INCLUDE_JFR
277 MUTEX_DEFN(JfrBuffer_lock , PaddedMutex , event);
278 MUTEX_DEFN(JfrMsg_lock , PaddedMonitor, event);
279 MUTEX_DEFN(JfrStacktrace_lock , PaddedMutex , event);
280 MUTEX_DEFN(JfrThreadSampler_lock , PaddedMonitor, nosafepoint);
281 #endif
282
283 MUTEX_DEFN(ContinuationRelativize_lock , PaddedMonitor, nosafepoint-3);
284 MUTEX_DEFN(CodeHeapStateAnalytics_lock , PaddedMutex , safepoint);
285 MUTEX_DEFN(ThreadsSMRDelete_lock , PaddedMonitor, service-2); // Holds ConcurrentHashTableResize_lock
286 MUTEX_DEFN(ThreadIdTableCreate_lock , PaddedMutex , safepoint);
287 MUTEX_DEFN(SharedDecoder_lock , PaddedMutex , tty-1);
288 MUTEX_DEFN(DCmdFactory_lock , PaddedMutex , nosafepoint);
289 MUTEX_DEFN(NMTQuery_lock , PaddedMutex , safepoint);
290 MUTEX_DEFN(NMTCompilationCostHistory_lock , PaddedMutex , nosafepoint);
291 #if INCLUDE_CDS
292 #if INCLUDE_JVMTI
293 MUTEX_DEFN(CDSClassFileStream_lock , PaddedMutex , safepoint);
294 #endif
295 MUTEX_DEFN(DumpTimeTable_lock , PaddedMutex , nosafepoint);
296 MUTEX_DEFN(CDSLambda_lock , PaddedMutex , nosafepoint);
297 MUTEX_DEFN(DumpRegion_lock , PaddedMutex , nosafepoint);
298 MUTEX_DEFN(ClassListFile_lock , PaddedMutex , nosafepoint);
299 MUTEX_DEFN(UnregisteredClassesTable_lock , PaddedMutex , nosafepoint-1);
300 MUTEX_DEFN(LambdaFormInvokers_lock , PaddedMutex , safepoint);
301 MUTEX_DEFN(ScratchObjects_lock , PaddedMutex , nosafepoint-1); // Holds DumpTimeTable_lock
302 #endif // INCLUDE_CDS
303 MUTEX_DEFN(Bootclasspath_lock , PaddedMutex , nosafepoint);
304
305 #if INCLUDE_JVMCI
306 // JVMCIRuntime::_lock must be acquired before JVMCI_lock to avoid deadlock
307 MUTEX_DEFN(JVMCIRuntime_lock , PaddedMonitor, safepoint, true);
308 #endif
309
310 MUTEX_DEFN(ThreadsLockThrottle_lock , PaddedMonitor, safepoint);
311
312 // These locks have relative rankings, and inherit safepoint checking attributes from that rank.
313 MUTEX_DEFL(VtableStubs_lock , PaddedMutex , CompiledIC_lock); // Also holds DumpTimeTable_lock
314 MUTEX_DEFL(CodeCache_lock , PaddedMonitor, VtableStubs_lock);
315 MUTEX_DEFL(NMethodState_lock , PaddedMutex , CodeCache_lock);
316
317 // tty_lock is held when printing nmethod and its relocations which use this lock.
318 MUTEX_DEFL(ExternalsRecorder_lock , PaddedMutex , tty_lock);
319
320 MUTEX_DEFL(Threads_lock , PaddedMonitor, CompileThread_lock, true);
321 MUTEX_DEFL(Compile_lock , PaddedMutex , MethodCompileQueue_lock);
322 MUTEX_DEFL(Heap_lock , PaddedMonitor, AdapterHandlerLibrary_lock);
323
324 MUTEX_DEFL(PerfDataMemAlloc_lock , PaddedMutex , Heap_lock);
325 MUTEX_DEFL(PerfDataManager_lock , PaddedMutex , Heap_lock);
326 MUTEX_DEFL(VMOperation_lock , PaddedMonitor, Heap_lock, true);
327 MUTEX_DEFL(ClassInitError_lock , PaddedMonitor, Threads_lock);
328
329 if (UseG1GC) {
330 MUTEX_DEFL(G1OldGCCount_lock , PaddedMonitor, Threads_lock, true);
331 MUTEX_DEFL(G1RareEvent_lock , PaddedMutex , Threads_lock, true);
332 }
333
334 MUTEX_DEFL(CompileTaskAlloc_lock , PaddedMutex , MethodCompileQueue_lock);
335 #ifdef INCLUDE_PARALLELGC
336 if (UseParallelGC) {
337 MUTEX_DEFL(PSOldGenExpand_lock , PaddedMutex , Heap_lock, true);
338 }
339 #endif
340 MUTEX_DEFL(Module_lock , PaddedMutex , ClassLoaderDataGraph_lock);
341 MUTEX_DEFL(SystemDictionary_lock , PaddedMonitor, Module_lock);
342 MUTEX_DEFL(JNICritical_lock , PaddedMonitor, AdapterHandlerLibrary_lock); // used for JNI critical regions
343 #if INCLUDE_JVMCI
344 // JVMCIRuntime_lock must be acquired before JVMCI_lock to avoid deadlock
345 MUTEX_DEFL(JVMCI_lock , PaddedMonitor, JVMCIRuntime_lock);
346 #endif
347 MUTEX_DEFL(JvmtiThreadState_lock , PaddedMutex , JvmtiVTMSTransition_lock); // Used by JvmtiThreadState/JvmtiEventController
348
349 // Allocate RecursiveMutex
350 MultiArray_lock = new RecursiveMutex();
351 }
352
353 #undef MUTEX_DEFL
354 #undef MUTEX_DEFN
355 #undef MUTEX_DEF
356 #undef MUTEX_STORAGE
357 #undef MUTEX_STORAGE_NAME
358
359 void MutexLockerImpl::post_initialize() {
360 // Print mutex ranks if requested.
361 LogTarget(Info, vmmutex) lt;
362 if (lt.is_enabled()) {
363 ResourceMark rm;
364 LogStream ls(lt);
365 Mutex::print_lock_ranks(&ls);
366 }
367 }
368
369 GCMutexLocker::GCMutexLocker(Mutex* mutex) {
370 if (SafepointSynchronize::is_at_safepoint()) {
371 _locked = false;
372 } else {
373 _mutex = mutex;
374 _locked = true;
375 _mutex->lock();
376 }
377 }
378