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annotate src/share/vm/runtime/mutexLocker.hpp @ 18096:ca6d25be853b jdk8u25-b13
8044269: Analysis of archive files.
Summary: Add checksum verification.
Reviewed-by: iklam, dholmes, mschoene
| author | jiangli |
|---|---|
| date | Tue, 12 Aug 2014 17:46:16 -0400 |
| parents | 62c54fcc0a35 |
| children | 52b4284cb496 581e70386ec9 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 17764 | 2 * Copyright (c) 1997, 2014, 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 | |
| 14411 | 39 #ifdef TARGET_OS_FAMILY_aix |
| 40 # include "os_aix.inline.hpp" | |
| 41 #endif | |
| 3960 | 42 #ifdef TARGET_OS_FAMILY_bsd |
| 43 # include "os_bsd.inline.hpp" | |
| 44 #endif | |
| 1972 | 45 |
| 0 | 46 // Mutexes used in the VM. |
| 47 | |
| 48 extern Mutex* Patching_lock; // a lock used to guard code patching of compiled code | |
| 49 extern Monitor* SystemDictionary_lock; // a lock on the system dictonary | |
| 50 extern Mutex* PackageTable_lock; // a lock on the class loader package table | |
| 51 extern Mutex* CompiledIC_lock; // a lock used to guard compiled IC patching and access | |
| 52 extern Mutex* InlineCacheBuffer_lock; // a lock used to guard the InlineCacheBuffer | |
| 53 extern Mutex* VMStatistic_lock; // a lock used to guard statistics count increment | |
| 54 extern Mutex* JNIGlobalHandle_lock; // a lock on creating JNI global handles | |
| 55 extern Mutex* JNIHandleBlockFreeList_lock; // a lock on the JNI handle block free list | |
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56 extern Mutex* MemberNameTable_lock; // a lock on the MemberNameTable updates |
| 0 | 57 extern Mutex* JmethodIdCreation_lock; // a lock on creating JNI method identifiers |
| 58 extern Mutex* JfieldIdCreation_lock; // a lock on creating JNI static field identifiers | |
| 59 extern Monitor* JNICritical_lock; // a lock used while entering and exiting JNI critical regions, allows GC to sometimes get in | |
| 60 extern Mutex* JvmtiThreadState_lock; // a lock on modification of JVMTI thread data | |
| 61 extern Monitor* JvmtiPendingEvent_lock; // a lock on the JVMTI pending events list | |
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62 extern Monitor* Heap_lock; // a lock on the heap |
| 0 | 63 extern Mutex* ExpandHeap_lock; // a lock on expanding the heap |
| 64 extern Mutex* AdapterHandlerLibrary_lock; // a lock on the AdapterHandlerLibrary | |
| 65 extern Mutex* SignatureHandlerLibrary_lock; // a lock on the SignatureHandlerLibrary | |
| 66 extern Mutex* VtableStubs_lock; // a lock on the VtableStubs | |
| 67 extern Mutex* SymbolTable_lock; // a lock on the symbol table | |
| 68 extern Mutex* StringTable_lock; // a lock on the interned string table | |
| 17764 | 69 extern Monitor* StringDedupQueue_lock; // a lock on the string deduplication queue |
| 70 extern Mutex* StringDedupTable_lock; // a lock on the string deduplication table | |
| 0 | 71 extern Mutex* CodeCache_lock; // a lock on the CodeCache, rank is special, use MutexLockerEx |
| 72 extern Mutex* MethodData_lock; // a lock on installation of method data | |
| 73 extern Mutex* RetData_lock; // a lock on installation of RetData inside method data | |
| 74 extern Mutex* DerivedPointerTableGC_lock; // a lock to protect the derived pointer table | |
| 75 extern Monitor* VMOperationQueue_lock; // a lock on queue of vm_operations waiting to execute | |
| 76 extern Monitor* VMOperationRequest_lock; // a lock on Threads waiting for a vm_operation to terminate | |
| 77 extern Monitor* Safepoint_lock; // a lock used by the safepoint abstraction | |
| 78 extern Monitor* Threads_lock; // a lock on the Threads table of active Java threads | |
| 79 // (also used by Safepoints too to block threads creation/destruction) | |
| 80 extern Monitor* CGC_lock; // used for coordination between | |
| 81 // fore- & background GC threads. | |
| 82 extern Mutex* STS_init_lock; // coordinate initialization of SuspendibleThreadSets. | |
| 83 extern Monitor* SLT_lock; // used in CMS GC for acquiring PLL | |
| 84 extern Monitor* iCMS_lock; // CMS incremental mode start/stop notification | |
| 85 extern Monitor* FullGCCount_lock; // in support of "concurrent" full gc | |
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86 extern Monitor* CMark_lock; // used for concurrent mark thread coordination |
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87 extern Mutex* CMRegionStack_lock; // used for protecting accesses to the CM region stack |
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88 extern Mutex* SATB_Q_FL_lock; // Protects SATB Q |
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89 // buffer free list. |
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90 extern Monitor* SATB_Q_CBL_mon; // Protects SATB Q |
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91 // completed buffer queue. |
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92 extern Mutex* Shared_SATB_Q_lock; // Lock protecting SATB |
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93 // queue shared by |
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94 // non-Java threads. |
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95 |
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96 extern Mutex* DirtyCardQ_FL_lock; // Protects dirty card Q |
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97 // buffer free list. |
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98 extern Monitor* DirtyCardQ_CBL_mon; // Protects dirty card Q |
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99 // completed buffer queue. |
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100 extern Mutex* Shared_DirtyCardQ_lock; // Lock protecting dirty card |
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101 // queue shared by |
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102 // non-Java threads. |
| 0 | 103 // (see option ExplicitGCInvokesConcurrent) |
| 104 extern Mutex* ParGCRareEvent_lock; // Synchronizes various (rare) parallel GC ops. | |
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105 extern Mutex* EvacFailureStack_lock; // guards the evac failure scan stack |
| 0 | 106 extern Mutex* Compile_lock; // a lock held when Compilation is updating code (used to block CodeCache traversal, CHA updates, etc) |
| 107 extern Monitor* MethodCompileQueue_lock; // a lock held when method compilations are enqueued, dequeued | |
| 108 extern Monitor* CompileThread_lock; // a lock held by compile threads during compilation system initialization | |
| 109 extern Mutex* CompileTaskAlloc_lock; // a lock held when CompileTasks are allocated | |
| 110 extern Mutex* CompileStatistics_lock; // a lock held when updating compilation statistics | |
| 111 extern Mutex* MultiArray_lock; // a lock used to guard allocation of multi-dim arrays | |
| 112 extern Monitor* Terminator_lock; // a lock used to guard termination of the vm | |
| 113 extern Monitor* BeforeExit_lock; // a lock used to guard cleanups and shutdown hooks | |
| 114 extern Monitor* Notify_lock; // a lock used to synchronize the start-up of the vm | |
| 115 extern Monitor* Interrupt_lock; // a lock used for condition variable mediated interrupt processing | |
| 116 extern Monitor* ProfileVM_lock; // a lock used for profiling the VMThread | |
| 117 extern Mutex* ProfilePrint_lock; // a lock used to serialize the printing of profiles | |
| 118 extern Mutex* ExceptionCache_lock; // a lock used to synchronize exception cache updates | |
| 119 extern Mutex* OsrList_lock; // a lock used to serialize access to OSR queues | |
| 120 | |
| 121 #ifndef PRODUCT | |
| 122 extern Mutex* FullGCALot_lock; // a lock to make FullGCALot MT safe | |
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123 #endif // PRODUCT |
| 0 | 124 extern Mutex* Debug1_lock; // A bunch of pre-allocated locks that can be used for tracing |
| 125 extern Mutex* Debug2_lock; // down synchronization related bugs! | |
| 126 extern Mutex* Debug3_lock; | |
| 127 | |
| 128 extern Mutex* RawMonitor_lock; | |
| 129 extern Mutex* PerfDataMemAlloc_lock; // a lock on the allocator for PerfData memory for performance data | |
| 130 extern Mutex* PerfDataManager_lock; // a long on access to PerfDataManager resources | |
| 131 extern Mutex* ParkerFreeList_lock; | |
| 132 extern Mutex* OopMapCacheAlloc_lock; // protects allocation of oop_map caches | |
| 133 | |
| 2152 | 134 extern Mutex* FreeList_lock; // protects the free region list during safepoints |
| 135 extern Monitor* SecondaryFreeList_lock; // protects the secondary free region list | |
| 136 extern Mutex* OldSets_lock; // protects the old region sets | |
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137 extern Monitor* RootRegionScan_lock; // used to notify that the CM threads have finished scanning the IM snapshot regions |
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138 extern Mutex* MMUTracker_lock; // protects the MMU |
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139 // tracker data structures |
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140 extern Mutex* HotCardCache_lock; // protects the hot card cache |
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141 |
| 0 | 142 extern Mutex* Management_lock; // a lock used to serialize JVM management |
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143 extern Monitor* Service_lock; // a lock used for service thread operation |
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144 extern Monitor* PeriodicTask_lock; // protects the periodic task structure |
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145 |
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146 #ifdef INCLUDE_TRACE |
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147 extern Mutex* JfrStacktrace_lock; // used to guard access to the JFR stacktrace table |
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148 extern Monitor* JfrMsg_lock; // protects JFR messaging |
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149 extern Mutex* JfrBuffer_lock; // protects JFR buffer operations |
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150 extern Mutex* JfrStream_lock; // protects JFR stream access |
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151 extern Mutex* JfrThreadGroups_lock; // protects JFR access to Thread Groups |
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152 #endif |
| 0 | 153 |
| 154 // A MutexLocker provides mutual exclusion with respect to a given mutex | |
| 155 // for the scope which contains the locker. The lock is an OS lock, not | |
| 156 // an object lock, and the two do not interoperate. Do not use Mutex-based | |
| 157 // locks to lock on Java objects, because they will not be respected if a | |
| 158 // that object is locked using the Java locking mechanism. | |
| 159 // | |
| 160 // NOTE WELL!! | |
| 161 // | |
| 162 // See orderAccess.hpp. We assume throughout the VM that MutexLocker's | |
| 163 // and friends constructors do a fence, a lock and an acquire *in that | |
| 164 // order*. And that their destructors do a release and unlock, in *that* | |
| 165 // order. If their implementations change such that these assumptions | |
| 166 // are violated, a whole lot of code will break. | |
| 167 | |
| 168 // Print all mutexes/monitors that are currently owned by a thread; called | |
| 169 // by fatal error handler. | |
| 170 void print_owned_locks_on_error(outputStream* st); | |
| 171 | |
| 172 char *lock_name(Mutex *mutex); | |
| 173 | |
| 174 class MutexLocker: StackObj { | |
| 175 private: | |
| 176 Monitor * _mutex; | |
| 177 public: | |
| 178 MutexLocker(Monitor * mutex) { | |
| 179 assert(mutex->rank() != Mutex::special, | |
| 180 "Special ranked mutex should only use MutexLockerEx"); | |
| 181 _mutex = mutex; | |
| 182 _mutex->lock(); | |
| 183 } | |
| 184 | |
| 185 // Overloaded constructor passing current thread | |
| 186 MutexLocker(Monitor * mutex, Thread *thread) { | |
| 187 assert(mutex->rank() != Mutex::special, | |
| 188 "Special ranked mutex should only use MutexLockerEx"); | |
| 189 _mutex = mutex; | |
| 190 _mutex->lock(thread); | |
| 191 } | |
| 192 | |
| 193 ~MutexLocker() { | |
| 194 _mutex->unlock(); | |
| 195 } | |
| 196 | |
| 197 }; | |
| 198 | |
| 199 // for debugging: check that we're already owning this lock (or are at a safepoint) | |
| 200 #ifdef ASSERT | |
| 201 void assert_locked_or_safepoint(const Monitor * lock); | |
| 202 void assert_lock_strong(const Monitor * lock); | |
| 203 #else | |
| 204 #define assert_locked_or_safepoint(lock) | |
| 205 #define assert_lock_strong(lock) | |
| 206 #endif | |
| 207 | |
| 208 // A MutexLockerEx behaves like a MutexLocker when its constructor is | |
| 209 // called with a Mutex. Unlike a MutexLocker, its constructor can also be | |
| 210 // called with NULL, in which case the MutexLockerEx is a no-op. There | |
| 211 // is also a corresponding MutexUnlockerEx. We want to keep the | |
| 212 // basic MutexLocker as fast as possible. MutexLockerEx can also lock | |
| 213 // without safepoint check. | |
| 214 | |
| 215 class MutexLockerEx: public StackObj { | |
| 216 private: | |
| 217 Monitor * _mutex; | |
| 218 public: | |
| 219 MutexLockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) { | |
| 220 _mutex = mutex; | |
| 221 if (_mutex != NULL) { | |
| 222 assert(mutex->rank() > Mutex::special || no_safepoint_check, | |
| 223 "Mutexes with rank special or lower should not do safepoint checks"); | |
| 224 if (no_safepoint_check) | |
| 225 _mutex->lock_without_safepoint_check(); | |
| 226 else | |
| 227 _mutex->lock(); | |
| 228 } | |
| 229 } | |
| 230 | |
| 231 ~MutexLockerEx() { | |
| 232 if (_mutex != NULL) { | |
| 233 _mutex->unlock(); | |
| 234 } | |
| 235 } | |
| 236 }; | |
| 237 | |
| 238 // A MonitorLockerEx is like a MutexLockerEx above, except it takes | |
| 239 // a possibly null Monitor, and allows wait/notify as well which are | |
| 240 // delegated to the underlying Monitor. | |
| 241 | |
| 242 class MonitorLockerEx: public MutexLockerEx { | |
| 243 private: | |
| 244 Monitor * _monitor; | |
| 245 public: | |
| 246 MonitorLockerEx(Monitor* monitor, | |
| 247 bool no_safepoint_check = !Mutex::_no_safepoint_check_flag): | |
| 248 MutexLockerEx(monitor, no_safepoint_check), | |
| 249 _monitor(monitor) { | |
| 250 // Superclass constructor did locking | |
| 251 } | |
| 252 | |
| 253 ~MonitorLockerEx() { | |
| 254 #ifdef ASSERT | |
| 255 if (_monitor != NULL) { | |
| 256 assert_lock_strong(_monitor); | |
| 257 } | |
| 258 #endif // ASSERT | |
| 259 // Superclass destructor will do unlocking | |
| 260 } | |
| 261 | |
| 262 bool wait(bool no_safepoint_check = !Mutex::_no_safepoint_check_flag, | |
| 263 long timeout = 0, | |
| 264 bool as_suspend_equivalent = !Mutex::_as_suspend_equivalent_flag) { | |
| 265 if (_monitor != NULL) { | |
| 266 return _monitor->wait(no_safepoint_check, timeout, as_suspend_equivalent); | |
| 267 } | |
| 268 return false; | |
| 269 } | |
| 270 | |
| 271 bool notify_all() { | |
| 272 if (_monitor != NULL) { | |
| 273 return _monitor->notify_all(); | |
| 274 } | |
| 275 return true; | |
| 276 } | |
| 277 | |
| 278 bool notify() { | |
| 279 if (_monitor != NULL) { | |
| 280 return _monitor->notify(); | |
| 281 } | |
| 282 return true; | |
| 283 } | |
| 284 }; | |
| 285 | |
| 286 | |
| 287 | |
| 288 // A GCMutexLocker is usually initialized with a mutex that is | |
| 289 // automatically acquired in order to do GC. The function that | |
| 290 // synchronizes using a GCMutexLocker may be called both during and between | |
| 291 // GC's. Thus, it must acquire the mutex if GC is not in progress, but not | |
| 292 // if GC is in progress (since the mutex is already held on its behalf.) | |
| 293 | |
| 294 class GCMutexLocker: public StackObj { | |
| 295 private: | |
| 296 Monitor * _mutex; | |
| 297 bool _locked; | |
| 298 public: | |
| 299 GCMutexLocker(Monitor * mutex); | |
| 300 ~GCMutexLocker() { if (_locked) _mutex->unlock(); } | |
| 301 }; | |
| 302 | |
| 303 | |
| 304 | |
| 305 // A MutexUnlocker temporarily exits a previously | |
| 306 // entered mutex for the scope which contains the unlocker. | |
| 307 | |
| 308 class MutexUnlocker: StackObj { | |
| 309 private: | |
| 310 Monitor * _mutex; | |
| 311 | |
| 312 public: | |
| 313 MutexUnlocker(Monitor * mutex) { | |
| 314 _mutex = mutex; | |
| 315 _mutex->unlock(); | |
| 316 } | |
| 317 | |
| 318 ~MutexUnlocker() { | |
| 319 _mutex->lock(); | |
| 320 } | |
| 321 }; | |
| 322 | |
| 323 // A MutexUnlockerEx temporarily exits a previously | |
| 324 // entered mutex for the scope which contains the unlocker. | |
| 325 | |
| 326 class MutexUnlockerEx: StackObj { | |
| 327 private: | |
| 328 Monitor * _mutex; | |
| 329 bool _no_safepoint_check; | |
| 330 | |
| 331 public: | |
| 332 MutexUnlockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) { | |
| 333 _mutex = mutex; | |
| 334 _no_safepoint_check = no_safepoint_check; | |
| 335 _mutex->unlock(); | |
| 336 } | |
| 337 | |
| 338 ~MutexUnlockerEx() { | |
| 339 if (_no_safepoint_check == Mutex::_no_safepoint_check_flag) { | |
| 340 _mutex->lock_without_safepoint_check(); | |
| 341 } else { | |
| 342 _mutex->lock(); | |
| 343 } | |
| 344 } | |
| 345 }; | |
| 346 | |
| 347 #ifndef PRODUCT | |
| 348 // | |
| 349 // A special MutexLocker that allows: | |
| 350 // - reentrant locking | |
| 351 // - locking out of order | |
| 352 // | |
| 353 // Only too be used for verify code, where we can relaxe out dead-lock | |
| 354 // dection code a bit (unsafe, but probably ok). This code is NEVER to | |
| 355 // be included in a product version. | |
| 356 // | |
| 357 class VerifyMutexLocker: StackObj { | |
| 358 private: | |
| 359 Monitor * _mutex; | |
| 360 bool _reentrant; | |
| 361 public: | |
| 362 VerifyMutexLocker(Monitor * mutex) { | |
| 363 _mutex = mutex; | |
| 364 _reentrant = mutex->owned_by_self(); | |
| 365 if (!_reentrant) { | |
| 366 // We temp. diable strict safepoint checking, while we require the lock | |
| 367 FlagSetting fs(StrictSafepointChecks, false); | |
| 368 _mutex->lock(); | |
| 369 } | |
| 370 } | |
| 371 | |
| 372 ~VerifyMutexLocker() { | |
| 373 if (!_reentrant) { | |
| 374 _mutex->unlock(); | |
| 375 } | |
| 376 } | |
| 377 }; | |
| 378 | |
| 379 #endif | |
| 1972 | 380 |
| 381 #endif // SHARE_VM_RUNTIME_MUTEXLOCKER_HPP |