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annotate src/share/vm/runtime/mutexLocker.hpp @ 11083:8b789ce47503
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author | roland |
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date | Thu, 04 Jul 2013 01:42:34 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_MUTEXLOCKER_HPP |
26 #define SHARE_VM_RUNTIME_MUTEXLOCKER_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "runtime/mutex.hpp" | |
30 #ifdef TARGET_OS_FAMILY_linux | |
31 # include "os_linux.inline.hpp" | |
32 #endif | |
33 #ifdef TARGET_OS_FAMILY_solaris | |
34 # include "os_solaris.inline.hpp" | |
35 #endif | |
36 #ifdef TARGET_OS_FAMILY_windows | |
37 # include "os_windows.inline.hpp" | |
38 #endif | |
3960 | 39 #ifdef TARGET_OS_FAMILY_bsd |
40 # include "os_bsd.inline.hpp" | |
41 #endif | |
1972 | 42 |
0 | 43 // Mutexes used in the VM. |
44 | |
45 extern Mutex* Patching_lock; // a lock used to guard code patching of compiled code | |
46 extern Monitor* SystemDictionary_lock; // a lock on the system dictonary | |
47 extern Mutex* PackageTable_lock; // a lock on the class loader package table | |
48 extern Mutex* CompiledIC_lock; // a lock used to guard compiled IC patching and access | |
49 extern Mutex* InlineCacheBuffer_lock; // a lock used to guard the InlineCacheBuffer | |
50 extern Mutex* VMStatistic_lock; // a lock used to guard statistics count increment | |
51 extern Mutex* JNIGlobalHandle_lock; // a lock on creating JNI global handles | |
52 extern Mutex* JNIHandleBlockFreeList_lock; // a lock on the JNI handle block free list | |
53 extern Mutex* JNICachedItableIndex_lock; // a lock on caching an itable index during JNI invoke | |
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54 extern Mutex* MemberNameTable_lock; // a lock on the MemberNameTable updates |
0 | 55 extern Mutex* JmethodIdCreation_lock; // a lock on creating JNI method identifiers |
56 extern Mutex* JfieldIdCreation_lock; // a lock on creating JNI static field identifiers | |
57 extern Monitor* JNICritical_lock; // a lock used while entering and exiting JNI critical regions, allows GC to sometimes get in | |
58 extern Mutex* JvmtiThreadState_lock; // a lock on modification of JVMTI thread data | |
59 extern Monitor* JvmtiPendingEvent_lock; // a lock on the JVMTI pending events list | |
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60 extern Monitor* Heap_lock; // a lock on the heap |
0 | 61 extern Mutex* ExpandHeap_lock; // a lock on expanding the heap |
62 extern Mutex* AdapterHandlerLibrary_lock; // a lock on the AdapterHandlerLibrary | |
63 extern Mutex* SignatureHandlerLibrary_lock; // a lock on the SignatureHandlerLibrary | |
64 extern Mutex* VtableStubs_lock; // a lock on the VtableStubs | |
65 extern Mutex* SymbolTable_lock; // a lock on the symbol table | |
66 extern Mutex* StringTable_lock; // a lock on the interned string table | |
67 extern Mutex* CodeCache_lock; // a lock on the CodeCache, rank is special, use MutexLockerEx | |
68 extern Mutex* MethodData_lock; // a lock on installation of method data | |
69 extern Mutex* RetData_lock; // a lock on installation of RetData inside method data | |
70 extern Mutex* DerivedPointerTableGC_lock; // a lock to protect the derived pointer table | |
71 extern Monitor* VMOperationQueue_lock; // a lock on queue of vm_operations waiting to execute | |
72 extern Monitor* VMOperationRequest_lock; // a lock on Threads waiting for a vm_operation to terminate | |
73 extern Monitor* Safepoint_lock; // a lock used by the safepoint abstraction | |
74 extern Monitor* Threads_lock; // a lock on the Threads table of active Java threads | |
75 // (also used by Safepoints too to block threads creation/destruction) | |
76 extern Monitor* CGC_lock; // used for coordination between | |
77 // fore- & background GC threads. | |
78 extern Mutex* STS_init_lock; // coordinate initialization of SuspendibleThreadSets. | |
79 extern Monitor* SLT_lock; // used in CMS GC for acquiring PLL | |
80 extern Monitor* iCMS_lock; // CMS incremental mode start/stop notification | |
81 extern Monitor* FullGCCount_lock; // in support of "concurrent" full gc | |
342
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82 extern Monitor* CMark_lock; // used for concurrent mark thread coordination |
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83 extern Mutex* CMRegionStack_lock; // used for protecting accesses to the CM region stack |
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84 extern Mutex* SATB_Q_FL_lock; // Protects SATB Q |
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85 // buffer free list. |
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86 extern Monitor* SATB_Q_CBL_mon; // Protects SATB Q |
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87 // completed buffer queue. |
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88 extern Mutex* Shared_SATB_Q_lock; // Lock protecting SATB |
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89 // queue shared by |
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90 // non-Java threads. |
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91 |
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92 extern Mutex* DirtyCardQ_FL_lock; // Protects dirty card Q |
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93 // buffer free list. |
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94 extern Monitor* DirtyCardQ_CBL_mon; // Protects dirty card Q |
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95 // completed buffer queue. |
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96 extern Mutex* Shared_DirtyCardQ_lock; // Lock protecting dirty card |
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97 // queue shared by |
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98 // non-Java threads. |
0 | 99 // (see option ExplicitGCInvokesConcurrent) |
100 extern Mutex* ParGCRareEvent_lock; // Synchronizes various (rare) parallel GC ops. | |
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101 extern Mutex* EvacFailureStack_lock; // guards the evac failure scan stack |
0 | 102 extern Mutex* Compile_lock; // a lock held when Compilation is updating code (used to block CodeCache traversal, CHA updates, etc) |
103 extern Monitor* MethodCompileQueue_lock; // a lock held when method compilations are enqueued, dequeued | |
104 extern Monitor* CompileThread_lock; // a lock held by compile threads during compilation system initialization | |
105 extern Mutex* CompileTaskAlloc_lock; // a lock held when CompileTasks are allocated | |
106 extern Mutex* CompileStatistics_lock; // a lock held when updating compilation statistics | |
107 extern Mutex* MultiArray_lock; // a lock used to guard allocation of multi-dim arrays | |
108 extern Monitor* Terminator_lock; // a lock used to guard termination of the vm | |
109 extern Monitor* BeforeExit_lock; // a lock used to guard cleanups and shutdown hooks | |
110 extern Monitor* Notify_lock; // a lock used to synchronize the start-up of the vm | |
111 extern Monitor* Interrupt_lock; // a lock used for condition variable mediated interrupt processing | |
112 extern Monitor* ProfileVM_lock; // a lock used for profiling the VMThread | |
113 extern Mutex* ProfilePrint_lock; // a lock used to serialize the printing of profiles | |
114 extern Mutex* ExceptionCache_lock; // a lock used to synchronize exception cache updates | |
115 extern Mutex* OsrList_lock; // a lock used to serialize access to OSR queues | |
116 | |
117 #ifndef PRODUCT | |
118 extern Mutex* FullGCALot_lock; // a lock to make FullGCALot MT safe | |
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119 #endif // PRODUCT |
0 | 120 extern Mutex* Debug1_lock; // A bunch of pre-allocated locks that can be used for tracing |
121 extern Mutex* Debug2_lock; // down synchronization related bugs! | |
122 extern Mutex* Debug3_lock; | |
123 | |
124 extern Mutex* RawMonitor_lock; | |
125 extern Mutex* PerfDataMemAlloc_lock; // a lock on the allocator for PerfData memory for performance data | |
126 extern Mutex* PerfDataManager_lock; // a long on access to PerfDataManager resources | |
127 extern Mutex* ParkerFreeList_lock; | |
128 extern Mutex* OopMapCacheAlloc_lock; // protects allocation of oop_map caches | |
129 | |
2152 | 130 extern Mutex* FreeList_lock; // protects the free region list during safepoints |
131 extern Monitor* SecondaryFreeList_lock; // protects the secondary free region list | |
132 extern Mutex* OldSets_lock; // protects the old region sets | |
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133 extern Monitor* RootRegionScan_lock; // used to notify that the CM threads have finished scanning the IM snapshot regions |
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134 extern Mutex* MMUTracker_lock; // protects the MMU |
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135 // tracker data structures |
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136 extern Mutex* HotCardCache_lock; // protects the hot card cache |
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137 |
0 | 138 extern Mutex* Management_lock; // a lock used to serialize JVM management |
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139 extern Monitor* Service_lock; // a lock used for service thread operation |
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140 extern Mutex* Stacktrace_lock; // used to guard access to the stacktrace table |
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141 |
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142 extern Monitor* JfrQuery_lock; // protects JFR use |
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143 extern Monitor* JfrMsg_lock; // protects JFR messaging |
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144 extern Mutex* JfrBuffer_lock; // protects JFR buffer operations |
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145 extern Mutex* JfrStream_lock; // protects JFR stream access |
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146 extern Monitor* PeriodicTask_lock; // protects the periodic task structure |
0 | 147 |
148 // A MutexLocker provides mutual exclusion with respect to a given mutex | |
149 // for the scope which contains the locker. The lock is an OS lock, not | |
150 // an object lock, and the two do not interoperate. Do not use Mutex-based | |
151 // locks to lock on Java objects, because they will not be respected if a | |
152 // that object is locked using the Java locking mechanism. | |
153 // | |
154 // NOTE WELL!! | |
155 // | |
156 // See orderAccess.hpp. We assume throughout the VM that MutexLocker's | |
157 // and friends constructors do a fence, a lock and an acquire *in that | |
158 // order*. And that their destructors do a release and unlock, in *that* | |
159 // order. If their implementations change such that these assumptions | |
160 // are violated, a whole lot of code will break. | |
161 | |
162 // Print all mutexes/monitors that are currently owned by a thread; called | |
163 // by fatal error handler. | |
164 void print_owned_locks_on_error(outputStream* st); | |
165 | |
166 char *lock_name(Mutex *mutex); | |
167 | |
168 class MutexLocker: StackObj { | |
169 private: | |
170 Monitor * _mutex; | |
171 public: | |
172 MutexLocker(Monitor * mutex) { | |
173 assert(mutex->rank() != Mutex::special, | |
174 "Special ranked mutex should only use MutexLockerEx"); | |
175 _mutex = mutex; | |
176 _mutex->lock(); | |
177 } | |
178 | |
179 // Overloaded constructor passing current thread | |
180 MutexLocker(Monitor * mutex, Thread *thread) { | |
181 assert(mutex->rank() != Mutex::special, | |
182 "Special ranked mutex should only use MutexLockerEx"); | |
183 _mutex = mutex; | |
184 _mutex->lock(thread); | |
185 } | |
186 | |
187 ~MutexLocker() { | |
188 _mutex->unlock(); | |
189 } | |
190 | |
191 }; | |
192 | |
193 // for debugging: check that we're already owning this lock (or are at a safepoint) | |
194 #ifdef ASSERT | |
195 void assert_locked_or_safepoint(const Monitor * lock); | |
196 void assert_lock_strong(const Monitor * lock); | |
197 #else | |
198 #define assert_locked_or_safepoint(lock) | |
199 #define assert_lock_strong(lock) | |
200 #endif | |
201 | |
202 // A MutexLockerEx behaves like a MutexLocker when its constructor is | |
203 // called with a Mutex. Unlike a MutexLocker, its constructor can also be | |
204 // called with NULL, in which case the MutexLockerEx is a no-op. There | |
205 // is also a corresponding MutexUnlockerEx. We want to keep the | |
206 // basic MutexLocker as fast as possible. MutexLockerEx can also lock | |
207 // without safepoint check. | |
208 | |
209 class MutexLockerEx: public StackObj { | |
210 private: | |
211 Monitor * _mutex; | |
212 public: | |
213 MutexLockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) { | |
214 _mutex = mutex; | |
215 if (_mutex != NULL) { | |
216 assert(mutex->rank() > Mutex::special || no_safepoint_check, | |
217 "Mutexes with rank special or lower should not do safepoint checks"); | |
218 if (no_safepoint_check) | |
219 _mutex->lock_without_safepoint_check(); | |
220 else | |
221 _mutex->lock(); | |
222 } | |
223 } | |
224 | |
225 ~MutexLockerEx() { | |
226 if (_mutex != NULL) { | |
227 _mutex->unlock(); | |
228 } | |
229 } | |
230 }; | |
231 | |
232 // A MonitorLockerEx is like a MutexLockerEx above, except it takes | |
233 // a possibly null Monitor, and allows wait/notify as well which are | |
234 // delegated to the underlying Monitor. | |
235 | |
236 class MonitorLockerEx: public MutexLockerEx { | |
237 private: | |
238 Monitor * _monitor; | |
239 public: | |
240 MonitorLockerEx(Monitor* monitor, | |
241 bool no_safepoint_check = !Mutex::_no_safepoint_check_flag): | |
242 MutexLockerEx(monitor, no_safepoint_check), | |
243 _monitor(monitor) { | |
244 // Superclass constructor did locking | |
245 } | |
246 | |
247 ~MonitorLockerEx() { | |
248 #ifdef ASSERT | |
249 if (_monitor != NULL) { | |
250 assert_lock_strong(_monitor); | |
251 } | |
252 #endif // ASSERT | |
253 // Superclass destructor will do unlocking | |
254 } | |
255 | |
256 bool wait(bool no_safepoint_check = !Mutex::_no_safepoint_check_flag, | |
257 long timeout = 0, | |
258 bool as_suspend_equivalent = !Mutex::_as_suspend_equivalent_flag) { | |
259 if (_monitor != NULL) { | |
260 return _monitor->wait(no_safepoint_check, timeout, as_suspend_equivalent); | |
261 } | |
262 return false; | |
263 } | |
264 | |
265 bool notify_all() { | |
266 if (_monitor != NULL) { | |
267 return _monitor->notify_all(); | |
268 } | |
269 return true; | |
270 } | |
271 | |
272 bool notify() { | |
273 if (_monitor != NULL) { | |
274 return _monitor->notify(); | |
275 } | |
276 return true; | |
277 } | |
278 }; | |
279 | |
280 | |
281 | |
282 // A GCMutexLocker is usually initialized with a mutex that is | |
283 // automatically acquired in order to do GC. The function that | |
284 // synchronizes using a GCMutexLocker may be called both during and between | |
285 // GC's. Thus, it must acquire the mutex if GC is not in progress, but not | |
286 // if GC is in progress (since the mutex is already held on its behalf.) | |
287 | |
288 class GCMutexLocker: public StackObj { | |
289 private: | |
290 Monitor * _mutex; | |
291 bool _locked; | |
292 public: | |
293 GCMutexLocker(Monitor * mutex); | |
294 ~GCMutexLocker() { if (_locked) _mutex->unlock(); } | |
295 }; | |
296 | |
297 | |
298 | |
299 // A MutexUnlocker temporarily exits a previously | |
300 // entered mutex for the scope which contains the unlocker. | |
301 | |
302 class MutexUnlocker: StackObj { | |
303 private: | |
304 Monitor * _mutex; | |
305 | |
306 public: | |
307 MutexUnlocker(Monitor * mutex) { | |
308 _mutex = mutex; | |
309 _mutex->unlock(); | |
310 } | |
311 | |
312 ~MutexUnlocker() { | |
313 _mutex->lock(); | |
314 } | |
315 }; | |
316 | |
317 // A MutexUnlockerEx temporarily exits a previously | |
318 // entered mutex for the scope which contains the unlocker. | |
319 | |
320 class MutexUnlockerEx: StackObj { | |
321 private: | |
322 Monitor * _mutex; | |
323 bool _no_safepoint_check; | |
324 | |
325 public: | |
326 MutexUnlockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) { | |
327 _mutex = mutex; | |
328 _no_safepoint_check = no_safepoint_check; | |
329 _mutex->unlock(); | |
330 } | |
331 | |
332 ~MutexUnlockerEx() { | |
333 if (_no_safepoint_check == Mutex::_no_safepoint_check_flag) { | |
334 _mutex->lock_without_safepoint_check(); | |
335 } else { | |
336 _mutex->lock(); | |
337 } | |
338 } | |
339 }; | |
340 | |
341 #ifndef PRODUCT | |
342 // | |
343 // A special MutexLocker that allows: | |
344 // - reentrant locking | |
345 // - locking out of order | |
346 // | |
347 // Only too be used for verify code, where we can relaxe out dead-lock | |
348 // dection code a bit (unsafe, but probably ok). This code is NEVER to | |
349 // be included in a product version. | |
350 // | |
351 class VerifyMutexLocker: StackObj { | |
352 private: | |
353 Monitor * _mutex; | |
354 bool _reentrant; | |
355 public: | |
356 VerifyMutexLocker(Monitor * mutex) { | |
357 _mutex = mutex; | |
358 _reentrant = mutex->owned_by_self(); | |
359 if (!_reentrant) { | |
360 // We temp. diable strict safepoint checking, while we require the lock | |
361 FlagSetting fs(StrictSafepointChecks, false); | |
362 _mutex->lock(); | |
363 } | |
364 } | |
365 | |
366 ~VerifyMutexLocker() { | |
367 if (!_reentrant) { | |
368 _mutex->unlock(); | |
369 } | |
370 } | |
371 }; | |
372 | |
373 #endif | |
1972 | 374 |
375 #endif // SHARE_VM_RUNTIME_MUTEXLOCKER_HPP |