Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/mutexLocker.hpp @ 692:23276f80d930
6825642: nsk sajdi tests fail with NullPointerException
Reviewed-by: xlu, coleenp, kamg, swamyv
author | acorn |
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date | Thu, 02 Apr 2009 14:26:42 -0400 |
parents | 1ee8caae33af |
children | 315a5d70b295 |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // Mutexes used in the VM. | |
26 | |
27 extern Mutex* Patching_lock; // a lock used to guard code patching of compiled code | |
28 extern Monitor* SystemDictionary_lock; // a lock on the system dictonary | |
29 extern Mutex* PackageTable_lock; // a lock on the class loader package table | |
30 extern Mutex* CompiledIC_lock; // a lock used to guard compiled IC patching and access | |
31 extern Mutex* InlineCacheBuffer_lock; // a lock used to guard the InlineCacheBuffer | |
32 extern Mutex* VMStatistic_lock; // a lock used to guard statistics count increment | |
33 extern Mutex* JNIGlobalHandle_lock; // a lock on creating JNI global handles | |
34 extern Mutex* JNIHandleBlockFreeList_lock; // a lock on the JNI handle block free list | |
35 extern Mutex* JNICachedItableIndex_lock; // a lock on caching an itable index during JNI invoke | |
36 extern Mutex* JmethodIdCreation_lock; // a lock on creating JNI method identifiers | |
37 extern Mutex* JfieldIdCreation_lock; // a lock on creating JNI static field identifiers | |
38 extern Monitor* JNICritical_lock; // a lock used while entering and exiting JNI critical regions, allows GC to sometimes get in | |
39 extern Mutex* JvmtiThreadState_lock; // a lock on modification of JVMTI thread data | |
40 extern Monitor* JvmtiPendingEvent_lock; // a lock on the JVMTI pending events list | |
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41 extern Monitor* Heap_lock; // a lock on the heap |
0 | 42 extern Mutex* ExpandHeap_lock; // a lock on expanding the heap |
43 extern Mutex* AdapterHandlerLibrary_lock; // a lock on the AdapterHandlerLibrary | |
44 extern Mutex* SignatureHandlerLibrary_lock; // a lock on the SignatureHandlerLibrary | |
45 extern Mutex* VtableStubs_lock; // a lock on the VtableStubs | |
46 extern Mutex* SymbolTable_lock; // a lock on the symbol table | |
47 extern Mutex* StringTable_lock; // a lock on the interned string table | |
48 extern Mutex* CodeCache_lock; // a lock on the CodeCache, rank is special, use MutexLockerEx | |
49 extern Mutex* MethodData_lock; // a lock on installation of method data | |
50 extern Mutex* RetData_lock; // a lock on installation of RetData inside method data | |
51 extern Mutex* DerivedPointerTableGC_lock; // a lock to protect the derived pointer table | |
52 extern Monitor* VMOperationQueue_lock; // a lock on queue of vm_operations waiting to execute | |
53 extern Monitor* VMOperationRequest_lock; // a lock on Threads waiting for a vm_operation to terminate | |
54 extern Monitor* Safepoint_lock; // a lock used by the safepoint abstraction | |
55 extern Monitor* Threads_lock; // a lock on the Threads table of active Java threads | |
56 // (also used by Safepoints too to block threads creation/destruction) | |
57 extern Monitor* CGC_lock; // used for coordination between | |
58 // fore- & background GC threads. | |
59 extern Mutex* STS_init_lock; // coordinate initialization of SuspendibleThreadSets. | |
60 extern Monitor* SLT_lock; // used in CMS GC for acquiring PLL | |
61 extern Monitor* iCMS_lock; // CMS incremental mode start/stop notification | |
62 extern Monitor* FullGCCount_lock; // in support of "concurrent" full gc | |
342
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63 extern Monitor* CMark_lock; // used for concurrent mark thread coordination |
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64 extern Monitor* ZF_mon; // used for G1 conc zero-fill. |
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65 extern Monitor* Cleanup_mon; // used for G1 conc cleanup. |
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66 extern Monitor* G1ConcRefine_mon; // used for G1 conc-refine |
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67 // coordination. |
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68 |
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69 extern Mutex* SATB_Q_FL_lock; // Protects SATB Q |
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70 // buffer free list. |
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71 extern Monitor* SATB_Q_CBL_mon; // Protects SATB Q |
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72 // completed buffer queue. |
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73 extern Mutex* Shared_SATB_Q_lock; // Lock protecting SATB |
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74 // queue shared by |
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75 // non-Java threads. |
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76 |
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77 extern Mutex* DirtyCardQ_FL_lock; // Protects dirty card Q |
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78 // buffer free list. |
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79 extern Monitor* DirtyCardQ_CBL_mon; // Protects dirty card Q |
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80 // completed buffer queue. |
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81 extern Mutex* Shared_DirtyCardQ_lock; // Lock protecting dirty card |
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82 // queue shared by |
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83 // non-Java threads. |
0 | 84 // (see option ExplicitGCInvokesConcurrent) |
85 extern Mutex* ParGCRareEvent_lock; // Synchronizes various (rare) parallel GC ops. | |
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86 extern Mutex* EvacFailureStack_lock; // guards the evac failure scan stack |
0 | 87 extern Mutex* Compile_lock; // a lock held when Compilation is updating code (used to block CodeCache traversal, CHA updates, etc) |
88 extern Monitor* MethodCompileQueue_lock; // a lock held when method compilations are enqueued, dequeued | |
89 #ifdef TIERED | |
90 extern Monitor* C1_lock; // a lock to ensure on single c1 compile is ever active | |
91 #endif // TIERED | |
92 extern Monitor* CompileThread_lock; // a lock held by compile threads during compilation system initialization | |
93 extern Mutex* CompileTaskAlloc_lock; // a lock held when CompileTasks are allocated | |
94 extern Mutex* CompileStatistics_lock; // a lock held when updating compilation statistics | |
95 extern Mutex* MultiArray_lock; // a lock used to guard allocation of multi-dim arrays | |
96 extern Monitor* Terminator_lock; // a lock used to guard termination of the vm | |
97 extern Monitor* BeforeExit_lock; // a lock used to guard cleanups and shutdown hooks | |
98 extern Monitor* Notify_lock; // a lock used to synchronize the start-up of the vm | |
99 extern Monitor* Interrupt_lock; // a lock used for condition variable mediated interrupt processing | |
100 extern Monitor* ProfileVM_lock; // a lock used for profiling the VMThread | |
101 extern Mutex* ProfilePrint_lock; // a lock used to serialize the printing of profiles | |
102 extern Mutex* ExceptionCache_lock; // a lock used to synchronize exception cache updates | |
103 extern Mutex* OsrList_lock; // a lock used to serialize access to OSR queues | |
104 | |
105 #ifndef PRODUCT | |
106 extern Mutex* FullGCALot_lock; // a lock to make FullGCALot MT safe | |
107 #endif | |
108 extern Mutex* Debug1_lock; // A bunch of pre-allocated locks that can be used for tracing | |
109 extern Mutex* Debug2_lock; // down synchronization related bugs! | |
110 extern Mutex* Debug3_lock; | |
111 | |
112 extern Mutex* RawMonitor_lock; | |
113 extern Mutex* PerfDataMemAlloc_lock; // a lock on the allocator for PerfData memory for performance data | |
114 extern Mutex* PerfDataManager_lock; // a long on access to PerfDataManager resources | |
115 extern Mutex* ParkerFreeList_lock; | |
116 extern Mutex* OopMapCacheAlloc_lock; // protects allocation of oop_map caches | |
117 | |
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118 extern Mutex* MMUTracker_lock; // protects the MMU |
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119 // tracker data structures |
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120 extern Mutex* HotCardCache_lock; // protects the hot card cache |
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121 |
0 | 122 extern Mutex* Management_lock; // a lock used to serialize JVM management |
123 extern Monitor* LowMemory_lock; // a lock used for low memory detection | |
124 | |
125 // A MutexLocker provides mutual exclusion with respect to a given mutex | |
126 // for the scope which contains the locker. The lock is an OS lock, not | |
127 // an object lock, and the two do not interoperate. Do not use Mutex-based | |
128 // locks to lock on Java objects, because they will not be respected if a | |
129 // that object is locked using the Java locking mechanism. | |
130 // | |
131 // NOTE WELL!! | |
132 // | |
133 // See orderAccess.hpp. We assume throughout the VM that MutexLocker's | |
134 // and friends constructors do a fence, a lock and an acquire *in that | |
135 // order*. And that their destructors do a release and unlock, in *that* | |
136 // order. If their implementations change such that these assumptions | |
137 // are violated, a whole lot of code will break. | |
138 | |
139 // Print all mutexes/monitors that are currently owned by a thread; called | |
140 // by fatal error handler. | |
141 void print_owned_locks_on_error(outputStream* st); | |
142 | |
143 char *lock_name(Mutex *mutex); | |
144 | |
145 class MutexLocker: StackObj { | |
146 private: | |
147 Monitor * _mutex; | |
148 public: | |
149 MutexLocker(Monitor * mutex) { | |
150 assert(mutex->rank() != Mutex::special, | |
151 "Special ranked mutex should only use MutexLockerEx"); | |
152 _mutex = mutex; | |
153 _mutex->lock(); | |
154 } | |
155 | |
156 // Overloaded constructor passing current thread | |
157 MutexLocker(Monitor * mutex, Thread *thread) { | |
158 assert(mutex->rank() != Mutex::special, | |
159 "Special ranked mutex should only use MutexLockerEx"); | |
160 _mutex = mutex; | |
161 _mutex->lock(thread); | |
162 } | |
163 | |
164 ~MutexLocker() { | |
165 _mutex->unlock(); | |
166 } | |
167 | |
168 }; | |
169 | |
170 // for debugging: check that we're already owning this lock (or are at a safepoint) | |
171 #ifdef ASSERT | |
172 void assert_locked_or_safepoint(const Monitor * lock); | |
173 void assert_lock_strong(const Monitor * lock); | |
174 #else | |
175 #define assert_locked_or_safepoint(lock) | |
176 #define assert_lock_strong(lock) | |
177 #endif | |
178 | |
179 // A MutexLockerEx behaves like a MutexLocker when its constructor is | |
180 // called with a Mutex. Unlike a MutexLocker, its constructor can also be | |
181 // called with NULL, in which case the MutexLockerEx is a no-op. There | |
182 // is also a corresponding MutexUnlockerEx. We want to keep the | |
183 // basic MutexLocker as fast as possible. MutexLockerEx can also lock | |
184 // without safepoint check. | |
185 | |
186 class MutexLockerEx: public StackObj { | |
187 private: | |
188 Monitor * _mutex; | |
189 public: | |
190 MutexLockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) { | |
191 _mutex = mutex; | |
192 if (_mutex != NULL) { | |
193 assert(mutex->rank() > Mutex::special || no_safepoint_check, | |
194 "Mutexes with rank special or lower should not do safepoint checks"); | |
195 if (no_safepoint_check) | |
196 _mutex->lock_without_safepoint_check(); | |
197 else | |
198 _mutex->lock(); | |
199 } | |
200 } | |
201 | |
202 ~MutexLockerEx() { | |
203 if (_mutex != NULL) { | |
204 _mutex->unlock(); | |
205 } | |
206 } | |
207 }; | |
208 | |
209 // A MonitorLockerEx is like a MutexLockerEx above, except it takes | |
210 // a possibly null Monitor, and allows wait/notify as well which are | |
211 // delegated to the underlying Monitor. | |
212 | |
213 class MonitorLockerEx: public MutexLockerEx { | |
214 private: | |
215 Monitor * _monitor; | |
216 public: | |
217 MonitorLockerEx(Monitor* monitor, | |
218 bool no_safepoint_check = !Mutex::_no_safepoint_check_flag): | |
219 MutexLockerEx(monitor, no_safepoint_check), | |
220 _monitor(monitor) { | |
221 // Superclass constructor did locking | |
222 } | |
223 | |
224 ~MonitorLockerEx() { | |
225 #ifdef ASSERT | |
226 if (_monitor != NULL) { | |
227 assert_lock_strong(_monitor); | |
228 } | |
229 #endif // ASSERT | |
230 // Superclass destructor will do unlocking | |
231 } | |
232 | |
233 bool wait(bool no_safepoint_check = !Mutex::_no_safepoint_check_flag, | |
234 long timeout = 0, | |
235 bool as_suspend_equivalent = !Mutex::_as_suspend_equivalent_flag) { | |
236 if (_monitor != NULL) { | |
237 return _monitor->wait(no_safepoint_check, timeout, as_suspend_equivalent); | |
238 } | |
239 return false; | |
240 } | |
241 | |
242 bool notify_all() { | |
243 if (_monitor != NULL) { | |
244 return _monitor->notify_all(); | |
245 } | |
246 return true; | |
247 } | |
248 | |
249 bool notify() { | |
250 if (_monitor != NULL) { | |
251 return _monitor->notify(); | |
252 } | |
253 return true; | |
254 } | |
255 }; | |
256 | |
257 | |
258 | |
259 // A GCMutexLocker is usually initialized with a mutex that is | |
260 // automatically acquired in order to do GC. The function that | |
261 // synchronizes using a GCMutexLocker may be called both during and between | |
262 // GC's. Thus, it must acquire the mutex if GC is not in progress, but not | |
263 // if GC is in progress (since the mutex is already held on its behalf.) | |
264 | |
265 class GCMutexLocker: public StackObj { | |
266 private: | |
267 Monitor * _mutex; | |
268 bool _locked; | |
269 public: | |
270 GCMutexLocker(Monitor * mutex); | |
271 ~GCMutexLocker() { if (_locked) _mutex->unlock(); } | |
272 }; | |
273 | |
274 | |
275 | |
276 // A MutexUnlocker temporarily exits a previously | |
277 // entered mutex for the scope which contains the unlocker. | |
278 | |
279 class MutexUnlocker: StackObj { | |
280 private: | |
281 Monitor * _mutex; | |
282 | |
283 public: | |
284 MutexUnlocker(Monitor * mutex) { | |
285 _mutex = mutex; | |
286 _mutex->unlock(); | |
287 } | |
288 | |
289 ~MutexUnlocker() { | |
290 _mutex->lock(); | |
291 } | |
292 }; | |
293 | |
294 // A MutexUnlockerEx temporarily exits a previously | |
295 // entered mutex for the scope which contains the unlocker. | |
296 | |
297 class MutexUnlockerEx: StackObj { | |
298 private: | |
299 Monitor * _mutex; | |
300 bool _no_safepoint_check; | |
301 | |
302 public: | |
303 MutexUnlockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) { | |
304 _mutex = mutex; | |
305 _no_safepoint_check = no_safepoint_check; | |
306 _mutex->unlock(); | |
307 } | |
308 | |
309 ~MutexUnlockerEx() { | |
310 if (_no_safepoint_check == Mutex::_no_safepoint_check_flag) { | |
311 _mutex->lock_without_safepoint_check(); | |
312 } else { | |
313 _mutex->lock(); | |
314 } | |
315 } | |
316 }; | |
317 | |
318 #ifndef PRODUCT | |
319 // | |
320 // A special MutexLocker that allows: | |
321 // - reentrant locking | |
322 // - locking out of order | |
323 // | |
324 // Only too be used for verify code, where we can relaxe out dead-lock | |
325 // dection code a bit (unsafe, but probably ok). This code is NEVER to | |
326 // be included in a product version. | |
327 // | |
328 class VerifyMutexLocker: StackObj { | |
329 private: | |
330 Monitor * _mutex; | |
331 bool _reentrant; | |
332 public: | |
333 VerifyMutexLocker(Monitor * mutex) { | |
334 _mutex = mutex; | |
335 _reentrant = mutex->owned_by_self(); | |
336 if (!_reentrant) { | |
337 // We temp. diable strict safepoint checking, while we require the lock | |
338 FlagSetting fs(StrictSafepointChecks, false); | |
339 _mutex->lock(); | |
340 } | |
341 } | |
342 | |
343 ~VerifyMutexLocker() { | |
344 if (!_reentrant) { | |
345 _mutex->unlock(); | |
346 } | |
347 } | |
348 }; | |
349 | |
350 #endif |