mutex.h revision db978719dbcb73fc6acfd193561445c4462786b8
18daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes/* 28daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes * Copyright (C) 2011 The Android Open Source Project 38daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes * 48daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes * Licensed under the Apache License, Version 2.0 (the "License"); 58daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes * you may not use this file except in compliance with the License. 68daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes * You may obtain a copy of the License at 78daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes * 88daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes * http://www.apache.org/licenses/LICENSE-2.0 98daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes * 108daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes * Unless required by applicable law or agreed to in writing, software 118daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes * distributed under the License is distributed on an "AS IS" BASIS, 128daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 138daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes * See the License for the specific language governing permissions and 148daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes * limitations under the License. 158daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes */ 168daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 17fc0e3219edc9a5bf81b166e82fd5db2796eb6a0dBrian Carlstrom#ifndef ART_RUNTIME_BASE_MUTEX_H_ 18fc0e3219edc9a5bf81b166e82fd5db2796eb6a0dBrian Carlstrom#define ART_RUNTIME_BASE_MUTEX_H_ 198daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 208daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes#include <pthread.h> 21cd74c4b3a6893c876c6e03fd99a1264249653d80Brian Carlstrom#include <stdint.h> 22ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes 23ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes#include <iosfwd> 248daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes#include <string> 258daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 26ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogers#include "atomic.h" 2707ed66b5ae659c452cbe1ab20c3dbf1d6f546461Elliott Hughes#include "base/logging.h" 28761600567d73b23324ae0251e871c15d6849ffd8Elliott Hughes#include "base/macros.h" 2900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers#include "globals.h" 3081d425b0b232962441616f8b14f73620bffef5e5Ian Rogers 31ab47016374d340011680e9cd970ee7d6225d6704Ian Rogers#if defined(__APPLE__) 3281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers#define ART_USE_FUTEXES 0 33ab47016374d340011680e9cd970ee7d6225d6704Ian Rogers#else 34c01417898a6e4f8a5663d6c0556982488c133cdfChris Dearman#define ART_USE_FUTEXES 1 35ab47016374d340011680e9cd970ee7d6225d6704Ian Rogers#endif 368daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 3766aee5cd571cf4739d2735769304202ea5051fb8Ian Rogers// Currently Darwin doesn't support locks with timeouts. 3866aee5cd571cf4739d2735769304202ea5051fb8Ian Rogers#if !defined(__APPLE__) 3966aee5cd571cf4739d2735769304202ea5051fb8Ian Rogers#define HAVE_TIMED_RWLOCK 1 4066aee5cd571cf4739d2735769304202ea5051fb8Ian Rogers#else 4166aee5cd571cf4739d2735769304202ea5051fb8Ian Rogers#define HAVE_TIMED_RWLOCK 0 4266aee5cd571cf4739d2735769304202ea5051fb8Ian Rogers#endif 4366aee5cd571cf4739d2735769304202ea5051fb8Ian Rogers 448daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughesnamespace art { 458daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 46719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogersclass LOCKABLE ReaderWriterMutex; 4756edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogersclass ScopedContentionRecorder; 4850b35e2fd1a68cd1240e4a9d9f363e11764957d1Ian Rogersclass Thread; 4950b35e2fd1a68cd1240e4a9d9f363e11764957d1Ian Rogers 50719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers// LockLevel is used to impose a lock hierarchy [1] where acquisition of a Mutex at a higher or 51719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers// equal level to a lock a thread holds is invalid. The lock hierarchy achieves a cycle free 52719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers// partial ordering and thereby cause deadlock situations to fail checks. 53719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers// 54719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers// [1] http://www.drdobbs.com/parallel/use-lock-hierarchies-to-avoid-deadlock/204801163 55719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogersenum LockLevel { 56719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kLoggingLock = 0, 573eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi kMemMapsLock, 587de77dd4f2d3cbb0615ee001589eb99ae82c3dccRaghu Gandham kSwapMutexesLock, 59719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kUnexpectedSignalLock, 60719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kThreadSuspendCountLock, 61719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kAbortLock, 62719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kJdwpSocketLock, 63a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier kReferenceQueueSoftReferencesLock, 64a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier kReferenceQueuePhantomReferencesLock, 65a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier kReferenceQueueFinalizerReferencesLock, 66a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier kReferenceQueueWeakReferencesLock, 67a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier kReferenceQueueClearedReferencesLock, 68a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier kReferenceProcessorLock, 69719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kRosAllocGlobalLock, 70719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kRosAllocBracketLock, 71719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kRosAllocBulkFreeLock, 72719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kAllocSpaceLock, 73719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kDexFileMethodInlinerLock, 74719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kDexFileToMethodInlinerMapLock, 75719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kMarkSweepMarkStackLock, 76719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kTransactionLogLock, 77719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kInternTableLock, 783f5838d7d0b9fc63db0ccc35c2ea05ed29264986Vladimir Marko kOatFileSecondaryLookupLock, 79719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kDefaultMutexLevel, 80719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kMarkSweepLargeObjectLock, 81719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kPinTableLock, 82719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kJdwpObjectRegistryLock, 839e36931cc79ca665908db9575126881d1cfdea5aChao-ying Fu kModifyLdtLock, 849e36931cc79ca665908db9575126881d1cfdea5aChao-ying Fu kAllocatedThreadIdsLock, 8574240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe kMonitorPoolLock, 86719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kClassLinkerClassesLock, 87719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kBreakpointLock, 88719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kMonitorLock, 89440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier kMonitorListLock, 9068d8b42ddec39ec0174162d90d4abaa004d1983eIan Rogers kJniLoadLibraryLock, 91719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kThreadListLock, 92719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kBreakpointInvokeLock, 93306db81aba41eb244a4e8299cf58ac18ae9999c7Brian Carlstrom kAllocTrackerLock, 94719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kDeoptimizationLock, 95719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kProfilerLock, 96719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kJdwpEventListLock, 97719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kJdwpAttachLock, 98719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kJdwpStartLock, 99719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kRuntimeShutdownLock, 10069dbec6d9d55eeb2867949c2791d01dc9aa916c8Jeff Hao kTraceLock, 101719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kHeapBitmapLock, 102719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kMutatorLock, 1039ef78b59da51080882e47505896b420977fd79aeMathieu Chartier kInstrumentEntrypointsLock, 104719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kZygoteCreationLock, 105719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 106719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers kLockLevelCount // Must come last. 107719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers}; 108719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogersstd::ostream& operator<<(std::ostream& os, const LockLevel& rhs); 109719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 1102e250c826b3c405d675017efe79e5db3651c9ee6Brian Carlstromconst bool kDebugLocking = kIsDebugBuild; 11125fd14b87cced64a179dee885573113be5e11944Ian Rogers 1121afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi// Record Log contention information, dumpable via SIGQUIT. 1131afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi#ifdef ART_USE_FUTEXES 11408f2e7b59fab9df108d3d91e6eeb4bbccbb325d1Jeff Hao// To enable lock contention logging, set this to true. 11508f2e7b59fab9df108d3d91e6eeb4bbccbb325d1Jeff Haoconst bool kLogLockContentions = false; 1161afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi#else 1171afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi// Keep this false as lock contention logging is supported only with 1181afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi// futex. 1191afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchiconst bool kLogLockContentions = false; 1201afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi#endif 121d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogersconst size_t kContentionLogSize = 4; 1221afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchiconst size_t kContentionLogDataSize = kLogLockContentions ? 1 : 0; 1231afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchiconst size_t kAllMutexDataSize = kLogLockContentions ? 1 : 0; 1241afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi 12500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Base class for all Mutex implementations 12600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogersclass BaseMutex { 12700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers public: 128bab74963db2484ea5f10a82ea26e8a99722bfefeIan Rogers const char* GetName() const { 12900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers return name_; 13000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 13100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 13200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers virtual bool IsMutex() const { return false; } 13300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers virtual bool IsReaderWriterMutex() const { return false; } 13400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 13556edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers virtual void Dump(std::ostream& os) const = 0; 13656edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers 13756edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers static void DumpAll(std::ostream& os); 13856edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers 13900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers protected: 14000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers friend class ConditionVariable; 14100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 14281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers BaseMutex(const char* name, LockLevel level); 14356edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers virtual ~BaseMutex(); 14481d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void RegisterAsLocked(Thread* self); 14581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void RegisterAsUnlocked(Thread* self); 14681d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void CheckSafeToWait(Thread* self); 14700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 14856edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers friend class ScopedContentionRecorder; 14956edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers 1501afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi void RecordContention(uint64_t blocked_tid, uint64_t owner_tid, uint64_t nano_time_blocked); 15156edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers void DumpContention(std::ostream& os) const; 15256edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers 15381d425b0b232962441616f8b14f73620bffef5e5Ian Rogers const LockLevel level_; // Support for lock hierarchy. 154bab74963db2484ea5f10a82ea26e8a99722bfefeIan Rogers const char* const name_; 1551afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi 15656edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers // A log entry that records contention but makes no guarantee that either tid will be held live. 15756edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers struct ContentionLogEntry { 15856edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers ContentionLogEntry() : blocked_tid(0), owner_tid(0) {} 15956edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers uint64_t blocked_tid; 16056edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers uint64_t owner_tid; 16156edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers AtomicInteger count; 16256edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers }; 1631afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi struct ContentionLogData { 1641afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi ContentionLogEntry contention_log[kContentionLogSize]; 1651afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi // The next entry in the contention log to be updated. Value ranges from 0 to 1661afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi // kContentionLogSize - 1. 1671afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi AtomicInteger cur_content_log_entry; 1681afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi // Number of times the Mutex has been contended. 1691afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi AtomicInteger contention_count; 1701afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi // Sum of time waited by all contenders in ns. 17137f3c968ecd04e77802fe17bb82dabc07de21ca1Ian Rogers Atomic<uint64_t> wait_time; 1721afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi void AddToWaitTime(uint64_t value); 1731afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi ContentionLogData() : wait_time(0) {} 1741afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi }; 1753e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers ContentionLogData contention_log_data_[kContentionLogDataSize]; 1761afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi 1771afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi public: 1781afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi bool HasEverContended() const { 1791afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi if (kLogLockContentions) { 1803e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers return contention_log_data_->contention_count.LoadSequentiallyConsistent() > 0; 1811afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi } 1821afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi return false; 1831afde13b36cc1d67528104c2b1395495f669cd3fHiroshi Yamauchi } 18400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers}; 18500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 18600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// A Mutex is used to achieve mutual exclusion between threads. A Mutex can be used to gain 18700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// exclusive access to what it guards. A Mutex can be in one of two states: 18800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// - Free - not owned by any thread, 18900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// - Exclusive - owned by a single thread. 19000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// 19100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// The effect of locking and unlocking operations on the state is: 19200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// State | ExclusiveLock | ExclusiveUnlock 19300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// ------------------------------------------- 19400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Free | Exclusive | error 19500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Exclusive | Block* | Free 19600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// * Mutex is not reentrant and so an attempt to ExclusiveLock on the same thread will result in 19700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// an error. Being non-reentrant simplifies Waiting on ConditionVariables. 19801ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogersstd::ostream& operator<<(std::ostream& os, const Mutex& mu); 19900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogersclass LOCKABLE Mutex : public BaseMutex { 20000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers public: 20181d425b0b232962441616f8b14f73620bffef5e5Ian Rogers explicit Mutex(const char* name, LockLevel level = kDefaultMutexLevel, bool recursive = false); 20200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers ~Mutex(); 20300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 20400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers virtual bool IsMutex() const { return true; } 20500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 20600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Block until mutex is free then acquire exclusive access. 20781d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void ExclusiveLock(Thread* self) EXCLUSIVE_LOCK_FUNCTION(); 20881d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void Lock(Thread* self) EXCLUSIVE_LOCK_FUNCTION() { ExclusiveLock(self); } 20900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 21000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Returns true if acquires exclusive access, false otherwise. 21181d425b0b232962441616f8b14f73620bffef5e5Ian Rogers bool ExclusiveTryLock(Thread* self) EXCLUSIVE_TRYLOCK_FUNCTION(true); 21281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers bool TryLock(Thread* self) EXCLUSIVE_TRYLOCK_FUNCTION(true) { return ExclusiveTryLock(self); } 21300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 21400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Release exclusive access. 21581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void ExclusiveUnlock(Thread* self) UNLOCK_FUNCTION(); 21681d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void Unlock(Thread* self) UNLOCK_FUNCTION() { ExclusiveUnlock(self); } 21700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 21800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Is the current thread the exclusive holder of the Mutex. 21981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers bool IsExclusiveHeld(const Thread* self) const; 2208daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 22100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Assert that the Mutex is exclusively held by the current thread. 22281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertExclusiveHeld(const Thread* self) { 223db978719dbcb73fc6acfd193561445c4462786b8Nicolas Geoffray if (kDebugLocking && (gAborting == 0)) { 22401ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogers CHECK(IsExclusiveHeld(self)) << *this; 22500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 22600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 22781d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertHeld(const Thread* self) { AssertExclusiveHeld(self); } 22800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 22900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Assert that the Mutex is not held by the current thread. 23081d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertNotHeldExclusive(const Thread* self) { 231db978719dbcb73fc6acfd193561445c4462786b8Nicolas Geoffray if (kDebugLocking && (gAborting == 0)) { 23201ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogers CHECK(!IsExclusiveHeld(self)) << *this; 23300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 23400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 23581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertNotHeld(const Thread* self) { AssertNotHeldExclusive(self); } 23600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 237c7190697f8665e706f6ebb4ae36fa63c46a32cd5Ian Rogers // Id associated with exclusive owner. No memory ordering semantics if called from a thread other 238c7190697f8665e706f6ebb4ae36fa63c46a32cd5Ian Rogers // than the owner. 23900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers uint64_t GetExclusiveOwnerTid() const; 24000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 24100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Returns how many times this Mutex has been locked, it is better to use AssertHeld/NotHeld. 24200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers unsigned int GetDepth() const { 24300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers return recursion_count_; 24400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 24500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 24656edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers virtual void Dump(std::ostream& os) const; 24701ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogers 24800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers private: 249c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers#if ART_USE_FUTEXES 250c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // 0 is unheld, 1 is held. 251c7190697f8665e706f6ebb4ae36fa63c46a32cd5Ian Rogers AtomicInteger state_; 252c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // Exclusive owner. 253c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers volatile uint64_t exclusive_owner_; 254c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // Number of waiting contenders. 255b122a4bbed34ab22b4c1541ee25e5cf22f12a926Ian Rogers AtomicInteger num_contenders_; 256c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers#else 25700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers pthread_mutex_t mutex_; 258c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers volatile uint64_t exclusive_owner_; // Guarded by mutex_. 259c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers#endif 26000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers const bool recursive_; // Can the lock be recursively held? 26100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers unsigned int recursion_count_; 262f1498437b0d6beb9f4f91980b98cbeb0b5c773ceElliott Hughes friend class ConditionVariable; 2638daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes DISALLOW_COPY_AND_ASSIGN(Mutex); 2648daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes}; 2658daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 26600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// A ReaderWriterMutex is used to achieve mutual exclusion between threads, similar to a Mutex. 26700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Unlike a Mutex a ReaderWriterMutex can be used to gain exclusive (writer) or shared (reader) 26800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// access to what it guards. A flaw in relation to a Mutex is that it cannot be used with a 26900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// condition variable. A ReaderWriterMutex can be in one of three states: 27000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// - Free - not owned by any thread, 27100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// - Exclusive - owned by a single thread, 27200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// - Shared(n) - shared amongst n threads. 27300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// 27400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// The effect of locking and unlocking operations on the state is: 27500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// 27600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// State | ExclusiveLock | ExclusiveUnlock | SharedLock | SharedUnlock 27700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// ---------------------------------------------------------------------------- 27800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Free | Exclusive | error | SharedLock(1) | error 27900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Exclusive | Block | Free | Block | error 28000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Shared(n) | Block | error | SharedLock(n+1)* | Shared(n-1) or Free 28100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// * for large values of n the SharedLock may block. 28201ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogersstd::ostream& operator<<(std::ostream& os, const ReaderWriterMutex& mu); 28300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogersclass LOCKABLE ReaderWriterMutex : public BaseMutex { 2848daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes public: 28581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers explicit ReaderWriterMutex(const char* name, LockLevel level = kDefaultMutexLevel); 28600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers ~ReaderWriterMutex(); 28700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 28800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers virtual bool IsReaderWriterMutex() const { return true; } 28900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 29000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Block until ReaderWriterMutex is free then acquire exclusive access. 29181d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void ExclusiveLock(Thread* self) EXCLUSIVE_LOCK_FUNCTION(); 29281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void WriterLock(Thread* self) EXCLUSIVE_LOCK_FUNCTION() { ExclusiveLock(self); } 29300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 29400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Release exclusive access. 29581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void ExclusiveUnlock(Thread* self) UNLOCK_FUNCTION(); 29681d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void WriterUnlock(Thread* self) UNLOCK_FUNCTION() { ExclusiveUnlock(self); } 29700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 29800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Block until ReaderWriterMutex is free and acquire exclusive access. Returns true on success 29900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // or false if timeout is reached. 30066aee5cd571cf4739d2735769304202ea5051fb8Ian Rogers#if HAVE_TIMED_RWLOCK 301c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers bool ExclusiveLockWithTimeout(Thread* self, int64_t ms, int32_t ns) 30281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers EXCLUSIVE_TRYLOCK_FUNCTION(true); 30366aee5cd571cf4739d2735769304202ea5051fb8Ian Rogers#endif 30400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 30500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Block until ReaderWriterMutex is shared or free then acquire a share on the access. 3061ffa32f0be7becec4907b26ead353e4b17e1219cIan Rogers void SharedLock(Thread* self) SHARED_LOCK_FUNCTION() ALWAYS_INLINE; 30781d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void ReaderLock(Thread* self) SHARED_LOCK_FUNCTION() { SharedLock(self); } 30800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 30900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Try to acquire share of ReaderWriterMutex. 31081d425b0b232962441616f8b14f73620bffef5e5Ian Rogers bool SharedTryLock(Thread* self) EXCLUSIVE_TRYLOCK_FUNCTION(true); 31100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 31200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Release a share of the access. 3131ffa32f0be7becec4907b26ead353e4b17e1219cIan Rogers void SharedUnlock(Thread* self) UNLOCK_FUNCTION() ALWAYS_INLINE; 31481d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void ReaderUnlock(Thread* self) UNLOCK_FUNCTION() { SharedUnlock(self); } 31500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 31600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Is the current thread the exclusive holder of the ReaderWriterMutex. 31781d425b0b232962441616f8b14f73620bffef5e5Ian Rogers bool IsExclusiveHeld(const Thread* self) const; 31800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 31900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Assert the current thread has exclusive access to the ReaderWriterMutex. 32081d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertExclusiveHeld(const Thread* self) { 321db978719dbcb73fc6acfd193561445c4462786b8Nicolas Geoffray if (kDebugLocking && (gAborting == 0)) { 32201ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogers CHECK(IsExclusiveHeld(self)) << *this; 32300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 3248daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes } 32581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertWriterHeld(const Thread* self) { AssertExclusiveHeld(self); } 3268daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 32700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Assert the current thread doesn't have exclusive access to the ReaderWriterMutex. 32881d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertNotExclusiveHeld(const Thread* self) { 329db978719dbcb73fc6acfd193561445c4462786b8Nicolas Geoffray if (kDebugLocking && (gAborting == 0)) { 330e3359f7ad7671c5816f17145ca3a01516512e8d6Ian Rogers CHECK(!IsExclusiveHeld(self)) << *this; 33100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 33200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 33381d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertNotWriterHeld(const Thread* self) { AssertNotExclusiveHeld(self); } 33400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 33500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Is the current thread a shared holder of the ReaderWriterMutex. 33681d425b0b232962441616f8b14f73620bffef5e5Ian Rogers bool IsSharedHeld(const Thread* self) const; 33700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 33800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Assert the current thread has shared access to the ReaderWriterMutex. 33981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertSharedHeld(const Thread* self) { 340db978719dbcb73fc6acfd193561445c4462786b8Nicolas Geoffray if (kDebugLocking && (gAborting == 0)) { 34123055dc5d7a90c4a12e259fd0ed7cd4d04d89182Ian Rogers // TODO: we can only assert this well when self != NULL. 34223055dc5d7a90c4a12e259fd0ed7cd4d04d89182Ian Rogers CHECK(IsSharedHeld(self) || self == NULL) << *this; 34300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 3448daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes } 34581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertReaderHeld(const Thread* self) { AssertSharedHeld(self); } 3468daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 34700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Assert the current thread doesn't hold this ReaderWriterMutex either in shared or exclusive 34800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // mode. 34981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertNotHeld(const Thread* self) { 350db978719dbcb73fc6acfd193561445c4462786b8Nicolas Geoffray if (kDebugLocking && (gAborting == 0)) { 35101ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogers CHECK(!IsSharedHeld(self)) << *this; 35200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 35300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 35400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 355c7190697f8665e706f6ebb4ae36fa63c46a32cd5Ian Rogers // Id associated with exclusive owner. No memory ordering semantics if called from a thread other 356c7190697f8665e706f6ebb4ae36fa63c46a32cd5Ian Rogers // than the owner. 35700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers uint64_t GetExclusiveOwnerTid() const; 35881d425b0b232962441616f8b14f73620bffef5e5Ian Rogers 35956edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers virtual void Dump(std::ostream& os) const; 36001ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogers 3618daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes private: 36251d212ef31945743abe8a469707aaa25bab95357Ian Rogers#if ART_USE_FUTEXES 363cf7f19135f0e273f7b0136315633c2abfc715343Ian Rogers // Out-of-inline path for handling contention for a SharedLock. 364cf7f19135f0e273f7b0136315633c2abfc715343Ian Rogers void HandleSharedLockContention(Thread* self, int32_t cur_state); 365cf7f19135f0e273f7b0136315633c2abfc715343Ian Rogers 36681d425b0b232962441616f8b14f73620bffef5e5Ian Rogers // -1 implies held exclusive, +ve shared held by state_ many owners. 367c7190697f8665e706f6ebb4ae36fa63c46a32cd5Ian Rogers AtomicInteger state_; 368c7190697f8665e706f6ebb4ae36fa63c46a32cd5Ian Rogers // Exclusive owner. Modification guarded by this mutex. 36981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers volatile uint64_t exclusive_owner_; 370c7190697f8665e706f6ebb4ae36fa63c46a32cd5Ian Rogers // Number of contenders waiting for a reader share. 371c7190697f8665e706f6ebb4ae36fa63c46a32cd5Ian Rogers AtomicInteger num_pending_readers_; 372c7190697f8665e706f6ebb4ae36fa63c46a32cd5Ian Rogers // Number of contenders waiting to be the writer. 373b122a4bbed34ab22b4c1541ee25e5cf22f12a926Ian Rogers AtomicInteger num_pending_writers_; 37481d425b0b232962441616f8b14f73620bffef5e5Ian Rogers#else 37500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers pthread_rwlock_t rwlock_; 376c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers volatile uint64_t exclusive_owner_; // Guarded by rwlock_. 37781d425b0b232962441616f8b14f73620bffef5e5Ian Rogers#endif 37800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers DISALLOW_COPY_AND_ASSIGN(ReaderWriterMutex); 3798daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes}; 3808daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 38100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// ConditionVariables allow threads to queue and sleep. Threads may then be resumed individually 38200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// (Signal) or all at once (Broadcast). 3835f79133a435ebcb20000370d56046fe01201dd80Elliott Hughesclass ConditionVariable { 3845f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes public: 38523055dc5d7a90c4a12e259fd0ed7cd4d04d89182Ian Rogers explicit ConditionVariable(const char* name, Mutex& mutex); 3865f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes ~ConditionVariable(); 3875f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 388c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers void Broadcast(Thread* self); 389c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers void Signal(Thread* self); 390c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // TODO: No thread safety analysis on Wait and TimedWait as they call mutex operations via their 391c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // pointer copy, thereby defeating annotalysis. 392c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers void Wait(Thread* self) NO_THREAD_SAFETY_ANALYSIS; 3937b078e8c04f3e1451dbdd18543c8b9692b5b067eIan Rogers bool TimedWait(Thread* self, int64_t ms, int32_t ns) NO_THREAD_SAFETY_ANALYSIS; 3941d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Variant of Wait that should be used with caution. Doesn't validate that no mutexes are held 3951d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // when waiting. 3961d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // TODO: remove this. 3971d54e73444e017d3a65234e0f193846f3e27472bIan Rogers void WaitHoldingLocks(Thread* self) NO_THREAD_SAFETY_ANALYSIS; 3985f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 3995f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes private: 40023055dc5d7a90c4a12e259fd0ed7cd4d04d89182Ian Rogers const char* const name_; 401c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // The Mutex being used by waiters. It is an error to mix condition variables between different 402c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // Mutexes. 403c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers Mutex& guard_; 404c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers#if ART_USE_FUTEXES 405c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // A counter that is modified by signals and broadcasts. This ensures that when a waiter gives up 406d45f201e9bd43490e30a35710865789b8d70e249Ian Rogers // their Mutex and another thread takes it and signals, the waiting thread observes that sequence_ 407d45f201e9bd43490e30a35710865789b8d70e249Ian Rogers // changed and doesn't enter the wait. Modified while holding guard_, but is read by futex wait 408d45f201e9bd43490e30a35710865789b8d70e249Ian Rogers // without guard_ held. 409b122a4bbed34ab22b4c1541ee25e5cf22f12a926Ian Rogers AtomicInteger sequence_; 410c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // Number of threads that have come into to wait, not the length of the waiters on the futex as 4115bd97c483c1de1eb97afe76123b1b9ab53095edfIan Rogers // waiters may have been requeued onto guard_. Guarded by guard_. 412c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers volatile int32_t num_waiters_; 413c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers#else 414c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers pthread_cond_t cond_; 415c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers#endif 4165f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DISALLOW_COPY_AND_ASSIGN(ConditionVariable); 4175f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes}; 4185f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 41900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Scoped locker/unlocker for a regular Mutex that acquires mu upon construction and releases it 42000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// upon destruction. 42100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogersclass SCOPED_LOCKABLE MutexLock { 42200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers public: 42381d425b0b232962441616f8b14f73620bffef5e5Ian Rogers explicit MutexLock(Thread* self, Mutex& mu) EXCLUSIVE_LOCK_FUNCTION(mu) : self_(self), mu_(mu) { 42481d425b0b232962441616f8b14f73620bffef5e5Ian Rogers mu_.ExclusiveLock(self_); 42581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers } 42681d425b0b232962441616f8b14f73620bffef5e5Ian Rogers 42700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers ~MutexLock() UNLOCK_FUNCTION() { 42881d425b0b232962441616f8b14f73620bffef5e5Ian Rogers mu_.ExclusiveUnlock(self_); 42900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 43000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 43100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers private: 43281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers Thread* const self_; 43300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers Mutex& mu_; 43400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers DISALLOW_COPY_AND_ASSIGN(MutexLock); 43500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers}; 43600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Catch bug where variable name is omitted. "MutexLock (lock);" instead of "MutexLock mu(lock)". 437575e78c41ece0dec969d31f46be563d4eb7ae43bAndreas Gampe#define MutexLock(x) static_assert(0, "MutexLock declaration missing variable name") 43800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 43900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Scoped locker/unlocker for a ReaderWriterMutex that acquires read access to mu upon 44000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// construction and releases it upon destruction. 44100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogersclass SCOPED_LOCKABLE ReaderMutexLock { 44200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers public: 44381d425b0b232962441616f8b14f73620bffef5e5Ian Rogers explicit ReaderMutexLock(Thread* self, ReaderWriterMutex& mu) EXCLUSIVE_LOCK_FUNCTION(mu) : 44481d425b0b232962441616f8b14f73620bffef5e5Ian Rogers self_(self), mu_(mu) { 44581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers mu_.SharedLock(self_); 44681d425b0b232962441616f8b14f73620bffef5e5Ian Rogers } 44781d425b0b232962441616f8b14f73620bffef5e5Ian Rogers 44800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers ~ReaderMutexLock() UNLOCK_FUNCTION() { 44981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers mu_.SharedUnlock(self_); 45000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 45100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 45200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers private: 45381d425b0b232962441616f8b14f73620bffef5e5Ian Rogers Thread* const self_; 45400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers ReaderWriterMutex& mu_; 45500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers DISALLOW_COPY_AND_ASSIGN(ReaderMutexLock); 45600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers}; 45700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Catch bug where variable name is omitted. "ReaderMutexLock (lock);" instead of 45800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// "ReaderMutexLock mu(lock)". 459575e78c41ece0dec969d31f46be563d4eb7ae43bAndreas Gampe#define ReaderMutexLock(x) static_assert(0, "ReaderMutexLock declaration missing variable name") 46000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 46100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Scoped locker/unlocker for a ReaderWriterMutex that acquires write access to mu upon 46200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// construction and releases it upon destruction. 46300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogersclass SCOPED_LOCKABLE WriterMutexLock { 46400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers public: 46581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers explicit WriterMutexLock(Thread* self, ReaderWriterMutex& mu) EXCLUSIVE_LOCK_FUNCTION(mu) : 46681d425b0b232962441616f8b14f73620bffef5e5Ian Rogers self_(self), mu_(mu) { 46781d425b0b232962441616f8b14f73620bffef5e5Ian Rogers mu_.ExclusiveLock(self_); 46881d425b0b232962441616f8b14f73620bffef5e5Ian Rogers } 46981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers 47000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers ~WriterMutexLock() UNLOCK_FUNCTION() { 47181d425b0b232962441616f8b14f73620bffef5e5Ian Rogers mu_.ExclusiveUnlock(self_); 47200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 47300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 47400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers private: 47550b35e2fd1a68cd1240e4a9d9f363e11764957d1Ian Rogers Thread* const self_; 47600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers ReaderWriterMutex& mu_; 47700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers DISALLOW_COPY_AND_ASSIGN(WriterMutexLock); 47800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers}; 47900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Catch bug where variable name is omitted. "WriterMutexLock (lock);" instead of 48000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// "WriterMutexLock mu(lock)". 481575e78c41ece0dec969d31f46be563d4eb7ae43bAndreas Gampe#define WriterMutexLock(x) static_assert(0, "WriterMutexLock declaration missing variable name") 48200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 483719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers// Global mutexes corresponding to the levels above. 484719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogersclass Locks { 485719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers public: 486719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers static void Init(); 487719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 4889ef78b59da51080882e47505896b420977fd79aeMathieu Chartier // Guards allocation entrypoint instrumenting. 4894ad5cd3e7d519484559ef778d96fb3f0be8919faIan Rogers static Mutex* instrument_entrypoints_lock_; 4909ef78b59da51080882e47505896b420977fd79aeMathieu Chartier 491719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // The mutator_lock_ is used to allow mutators to execute in a shared (reader) mode or to block 492719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // mutators by having an exclusive (writer) owner. In normal execution each mutator thread holds 493719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // a share on the mutator_lock_. The garbage collector may also execute with shared access but 494719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // at times requires exclusive access to the heap (not to be confused with the heap meta-data 495719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // guarded by the heap_lock_ below). When the garbage collector requires exclusive access it asks 496719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // the mutators to suspend themselves which also involves usage of the thread_suspend_count_lock_ 497719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // to cover weaknesses in using ReaderWriterMutexes with ConditionVariables. We use a condition 498719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // variable to wait upon in the suspension logic as releasing and then re-acquiring a share on 499719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // the mutator lock doesn't necessarily allow the exclusive user (e.g the garbage collector) 500719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // chance to acquire the lock. 501719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // 502719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Thread suspension: 503719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Shared users | Exclusive user 504719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // (holding mutator lock and in kRunnable state) | .. running .. 505719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // .. running .. | Request thread suspension by: 506719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // .. running .. | - acquiring thread_suspend_count_lock_ 507719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // .. running .. | - incrementing Thread::suspend_count_ on 508719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // .. running .. | all mutator threads 509719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // .. running .. | - releasing thread_suspend_count_lock_ 510719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // .. running .. | Block trying to acquire exclusive mutator lock 511719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Poll Thread::suspend_count_ and enter full | .. blocked .. 512719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // suspend code. | .. blocked .. 513719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Change state to kSuspended | .. blocked .. 514719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // x: Release share on mutator_lock_ | Carry out exclusive access 515719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Acquire thread_suspend_count_lock_ | .. exclusive .. 516719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // while Thread::suspend_count_ > 0 | .. exclusive .. 517719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // - wait on Thread::resume_cond_ | .. exclusive .. 518719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // (releases thread_suspend_count_lock_) | .. exclusive .. 519719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // .. waiting .. | Release mutator_lock_ 520719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // .. waiting .. | Request thread resumption by: 521719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // .. waiting .. | - acquiring thread_suspend_count_lock_ 522719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // .. waiting .. | - decrementing Thread::suspend_count_ on 523719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // .. waiting .. | all mutator threads 524719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // .. waiting .. | - notifying on Thread::resume_cond_ 525719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // - re-acquire thread_suspend_count_lock_ | - releasing thread_suspend_count_lock_ 526719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Release thread_suspend_count_lock_ | .. running .. 527719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Acquire share on mutator_lock_ | .. running .. 528719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // - This could block but the thread still | .. running .. 529719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // has a state of kSuspended and so this | .. running .. 530719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // isn't an issue. | .. running .. 531719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Acquire thread_suspend_count_lock_ | .. running .. 532719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // - we poll here as we're transitioning into | .. running .. 533719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // kRunnable and an individual thread suspend | .. running .. 534719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // request (e.g for debugging) won't try | .. running .. 535719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // to acquire the mutator lock (which would | .. running .. 536719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // block as we hold the mutator lock). This | .. running .. 537719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // poll ensures that if the suspender thought | .. running .. 538719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // we were suspended by incrementing our | .. running .. 539719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Thread::suspend_count_ and then reading | .. running .. 540719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // our state we go back to waiting on | .. running .. 541719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Thread::resume_cond_. | .. running .. 542719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // can_go_runnable = Thread::suspend_count_ == 0 | .. running .. 543719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Release thread_suspend_count_lock_ | .. running .. 544719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // if can_go_runnable | .. running .. 545719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Change state to kRunnable | .. running .. 546719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // else | .. running .. 547719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Goto x | .. running .. 548719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // .. running .. | .. running .. 5499ef78b59da51080882e47505896b420977fd79aeMathieu Chartier static ReaderWriterMutex* mutator_lock_ ACQUIRED_AFTER(instrument_entrypoints_lock_); 550719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 551719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Allow reader-writer mutual exclusion on the mark and live bitmaps of the heap. 552719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers static ReaderWriterMutex* heap_bitmap_lock_ ACQUIRED_AFTER(mutator_lock_); 553719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 554719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Guards shutdown of the runtime. 555719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers static Mutex* runtime_shutdown_lock_ ACQUIRED_AFTER(heap_bitmap_lock_); 556719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 5579e36931cc79ca665908db9575126881d1cfdea5aChao-ying Fu // Guards background profiler global state. 5589e36931cc79ca665908db9575126881d1cfdea5aChao-ying Fu static Mutex* profiler_lock_ ACQUIRED_AFTER(runtime_shutdown_lock_); 5599e36931cc79ca665908db9575126881d1cfdea5aChao-ying Fu 5609e36931cc79ca665908db9575126881d1cfdea5aChao-ying Fu // Guards trace (ie traceview) requests. 5619e36931cc79ca665908db9575126881d1cfdea5aChao-ying Fu static Mutex* trace_lock_ ACQUIRED_AFTER(profiler_lock_); 5629e36931cc79ca665908db9575126881d1cfdea5aChao-ying Fu 563306db81aba41eb244a4e8299cf58ac18ae9999c7Brian Carlstrom // Guards debugger recent allocation records. 564306db81aba41eb244a4e8299cf58ac18ae9999c7Brian Carlstrom static Mutex* alloc_tracker_lock_ ACQUIRED_AFTER(trace_lock_); 565306db81aba41eb244a4e8299cf58ac18ae9999c7Brian Carlstrom 566306db81aba41eb244a4e8299cf58ac18ae9999c7Brian Carlstrom // Guards updates to instrumentation to ensure mutual exclusion of 567306db81aba41eb244a4e8299cf58ac18ae9999c7Brian Carlstrom // events like deoptimization requests. 568306db81aba41eb244a4e8299cf58ac18ae9999c7Brian Carlstrom // TODO: improve name, perhaps instrumentation_update_lock_. 569306db81aba41eb244a4e8299cf58ac18ae9999c7Brian Carlstrom static Mutex* deoptimization_lock_ ACQUIRED_AFTER(alloc_tracker_lock_); 570306db81aba41eb244a4e8299cf58ac18ae9999c7Brian Carlstrom 571719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // The thread_list_lock_ guards ThreadList::list_. It is also commonly held to stop threads 572719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // attaching and detaching. 573306db81aba41eb244a4e8299cf58ac18ae9999c7Brian Carlstrom static Mutex* thread_list_lock_ ACQUIRED_AFTER(deoptimization_lock_); 574719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 57568d8b42ddec39ec0174162d90d4abaa004d1983eIan Rogers // Guards maintaining loading library data structures. 57668d8b42ddec39ec0174162d90d4abaa004d1983eIan Rogers static Mutex* jni_libraries_lock_ ACQUIRED_AFTER(thread_list_lock_); 57768d8b42ddec39ec0174162d90d4abaa004d1983eIan Rogers 578719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Guards breakpoints. 579ed2be1725fb79075892b1a9103487c9d9a95b350Sebastien Hertz static ReaderWriterMutex* breakpoint_lock_ ACQUIRED_AFTER(jni_libraries_lock_); 580719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 581719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Guards lists of classes within the class linker. 5829e36931cc79ca665908db9575126881d1cfdea5aChao-ying Fu static ReaderWriterMutex* classlinker_classes_lock_ ACQUIRED_AFTER(breakpoint_lock_); 583719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 584719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // When declaring any Mutex add DEFAULT_MUTEX_ACQUIRED_AFTER to use annotalysis to check the code 585719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // doesn't try to hold a higher level Mutex. 586719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers #define DEFAULT_MUTEX_ACQUIRED_AFTER ACQUIRED_AFTER(Locks::classlinker_classes_lock_) 587719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 58874240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe static Mutex* allocated_monitor_ids_lock_ ACQUIRED_AFTER(classlinker_classes_lock_); 58974240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe 5909e36931cc79ca665908db9575126881d1cfdea5aChao-ying Fu // Guard the allocation/deallocation of thread ids. 59174240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe static Mutex* allocated_thread_ids_lock_ ACQUIRED_AFTER(allocated_monitor_ids_lock_); 5929e36931cc79ca665908db9575126881d1cfdea5aChao-ying Fu 5939e36931cc79ca665908db9575126881d1cfdea5aChao-ying Fu // Guards modification of the LDT on x86. 5949e36931cc79ca665908db9575126881d1cfdea5aChao-ying Fu static Mutex* modify_ldt_lock_ ACQUIRED_AFTER(allocated_thread_ids_lock_); 5959e36931cc79ca665908db9575126881d1cfdea5aChao-ying Fu 596719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Guards intern table. 5979e36931cc79ca665908db9575126881d1cfdea5aChao-ying Fu static Mutex* intern_table_lock_ ACQUIRED_AFTER(modify_ldt_lock_); 598719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 599a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier // Guards reference processor. 600a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier static Mutex* reference_processor_lock_ ACQUIRED_AFTER(intern_table_lock_); 601a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier 602a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier // Guards cleared references queue. 603a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier static Mutex* reference_queue_cleared_references_lock_ ACQUIRED_AFTER(reference_processor_lock_); 604a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier 605a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier // Guards weak references queue. 606a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier static Mutex* reference_queue_weak_references_lock_ ACQUIRED_AFTER(reference_queue_cleared_references_lock_); 607a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier 608a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier // Guards finalizer references queue. 609a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier static Mutex* reference_queue_finalizer_references_lock_ ACQUIRED_AFTER(reference_queue_weak_references_lock_); 610a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier 611a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier // Guards phantom references queue. 612a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier static Mutex* reference_queue_phantom_references_lock_ ACQUIRED_AFTER(reference_queue_finalizer_references_lock_); 613a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier 614a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier // Guards soft references queue. 615a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier static Mutex* reference_queue_soft_references_lock_ ACQUIRED_AFTER(reference_queue_phantom_references_lock_); 616a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier 617719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Have an exclusive aborting thread. 618a5a53efea976af505f4f849b5925d5e14c4f8e5cMathieu Chartier static Mutex* abort_lock_ ACQUIRED_AFTER(reference_queue_soft_references_lock_); 619719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 620719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Allow mutual exclusion when manipulating Thread::suspend_count_. 621719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // TODO: Does the trade-off of a per-thread lock make sense? 622719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers static Mutex* thread_suspend_count_lock_ ACQUIRED_AFTER(abort_lock_); 623719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 624719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // One unexpected signal at a time lock. 625719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers static Mutex* unexpected_signal_lock_ ACQUIRED_AFTER(thread_suspend_count_lock_); 626719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 6273eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi // Guards the maps in mem_map. 6283eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi static Mutex* mem_maps_lock_ ACQUIRED_AFTER(unexpected_signal_lock_); 6293eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 630719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers // Have an exclusive logging thread. 631719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers static Mutex* logging_lock_ ACQUIRED_AFTER(unexpected_signal_lock_); 632719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers}; 633719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 6348daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes} // namespace art 6358daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 636fc0e3219edc9a5bf81b166e82fd5db2796eb6a0dBrian Carlstrom#endif // ART_RUNTIME_BASE_MUTEX_H_ 637