mutex.h revision 1d54e73444e017d3a65234e0f193846f3e27472b
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 1776b6167407c2b6f5d40ad895b2793a6b037f54b2Elliott Hughes#ifndef ART_SRC_BASE_MUTEX_H_ 1876b6167407c2b6f5d40ad895b2793a6b037f54b2Elliott Hughes#define ART_SRC_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 2607ed66b5ae659c452cbe1ab20c3dbf1d6f546461Elliott Hughes#include "base/logging.h" 27761600567d73b23324ae0251e871c15d6849ffd8Elliott Hughes#include "base/macros.h" 2800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers#include "globals.h" 2981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers#include "locks.h" 3081d425b0b232962441616f8b14f73620bffef5e5Ian Rogers 31ab47016374d340011680e9cd970ee7d6225d6704Ian Rogers#if defined(__APPLE__) 3281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers#define ART_USE_FUTEXES 0 33ab47016374d340011680e9cd970ee7d6225d6704Ian Rogers#else 34a6f3aaf8ca5385d870c35d1555b7787d56a70c95Ian Rogers#define ART_USE_FUTEXES !defined(__mips__) 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 4456edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers// Record Log contention information, dumpable via SIGQUIT. 4556edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers#define CONTENTION_LOGGING (0 && ART_USE_FUTEXES) 4656edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogersconst size_t kContentionLogSize = 64; 4756edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers#if CONTENTION_LOGGING 4856edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers#include "atomic_integer.h" 4956edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers#endif 5056edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers 518daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughesnamespace art { 528daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 5356edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogersclass ScopedContentionRecorder; 5450b35e2fd1a68cd1240e4a9d9f363e11764957d1Ian Rogersclass Thread; 5550b35e2fd1a68cd1240e4a9d9f363e11764957d1Ian Rogers 56ccf124800fe025be3ca05c28a60514909ca66a11Ian Rogersconst bool kDebugLocking = true || kIsDebugBuild; 5725fd14b87cced64a179dee885573113be5e11944Ian Rogers 5800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Base class for all Mutex implementations 5900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogersclass BaseMutex { 6000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers public: 61bab74963db2484ea5f10a82ea26e8a99722bfefeIan Rogers const char* GetName() const { 6200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers return name_; 6300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 6400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 6500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers virtual bool IsMutex() const { return false; } 6600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers virtual bool IsReaderWriterMutex() const { return false; } 6700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 6856edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers virtual void Dump(std::ostream& os) const = 0; 6956edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers 7056edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers static void DumpAll(std::ostream& os); 7156edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers 7200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers protected: 7300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers friend class ConditionVariable; 7400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 7581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers BaseMutex(const char* name, LockLevel level); 7656edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers virtual ~BaseMutex(); 7781d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void RegisterAsLocked(Thread* self); 7881d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void RegisterAsUnlocked(Thread* self); 7981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void CheckSafeToWait(Thread* self); 8000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 8156edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers friend class ScopedContentionRecorder; 8256edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers 8356edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers void RecordContention(uint64_t blocked_tid, uint64_t owner_tid, uint64_t milli_time_blocked); 8456edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers void DumpContention(std::ostream& os) const; 8556edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers 8681d425b0b232962441616f8b14f73620bffef5e5Ian Rogers const LockLevel level_; // Support for lock hierarchy. 87bab74963db2484ea5f10a82ea26e8a99722bfefeIan Rogers const char* const name_; 8856edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers#if CONTENTION_LOGGING 8956edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers // A log entry that records contention but makes no guarantee that either tid will be held live. 9056edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers struct ContentionLogEntry { 9156edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers ContentionLogEntry() : blocked_tid(0), owner_tid(0) {} 9256edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers uint64_t blocked_tid; 9356edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers uint64_t owner_tid; 9456edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers AtomicInteger count; 9556edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers }; 9656edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers ContentionLogEntry contention_log_[kContentionLogSize]; 9756edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers // The next entry in the contention log to be updated. Value ranges from 0 to 9856edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers // kContentionLogSize - 1. 9956edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers AtomicInteger cur_content_log_entry_; 10056edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers // Number of times the Mutex has been contended. 10156edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers AtomicInteger contention_count_; 10256edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers // Sum of time waited by all contenders in ms. 10356edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers AtomicInteger wait_time_; 10456edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers#endif 10500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers}; 10600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 10700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// A Mutex is used to achieve mutual exclusion between threads. A Mutex can be used to gain 10800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// exclusive access to what it guards. A Mutex can be in one of two states: 10900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// - Free - not owned by any thread, 11000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// - Exclusive - owned by a single thread. 11100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// 11200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// The effect of locking and unlocking operations on the state is: 11300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// State | ExclusiveLock | ExclusiveUnlock 11400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// ------------------------------------------- 11500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Free | Exclusive | error 11600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Exclusive | Block* | Free 11700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// * Mutex is not reentrant and so an attempt to ExclusiveLock on the same thread will result in 11800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// an error. Being non-reentrant simplifies Waiting on ConditionVariables. 11901ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogersstd::ostream& operator<<(std::ostream& os, const Mutex& mu); 12000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogersclass LOCKABLE Mutex : public BaseMutex { 12100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers public: 12281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers explicit Mutex(const char* name, LockLevel level = kDefaultMutexLevel, bool recursive = false); 12300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers ~Mutex(); 12400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 12500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers virtual bool IsMutex() const { return true; } 12600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 12700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Block until mutex is free then acquire exclusive access. 12881d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void ExclusiveLock(Thread* self) EXCLUSIVE_LOCK_FUNCTION(); 12981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void Lock(Thread* self) EXCLUSIVE_LOCK_FUNCTION() { ExclusiveLock(self); } 13000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 13100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Returns true if acquires exclusive access, false otherwise. 13281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers bool ExclusiveTryLock(Thread* self) EXCLUSIVE_TRYLOCK_FUNCTION(true); 13381d425b0b232962441616f8b14f73620bffef5e5Ian Rogers bool TryLock(Thread* self) EXCLUSIVE_TRYLOCK_FUNCTION(true) { return ExclusiveTryLock(self); } 13400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 13500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Release exclusive access. 13681d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void ExclusiveUnlock(Thread* self) UNLOCK_FUNCTION(); 13781d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void Unlock(Thread* self) UNLOCK_FUNCTION() { ExclusiveUnlock(self); } 13800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 13900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Is the current thread the exclusive holder of the Mutex. 14081d425b0b232962441616f8b14f73620bffef5e5Ian Rogers bool IsExclusiveHeld(const Thread* self) const; 1418daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 14200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Assert that the Mutex is exclusively held by the current thread. 14381d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertExclusiveHeld(const Thread* self) { 1443c539ffccabada93c404c0dfba8b52926ae06d0cAnwar Ghuloum if (kDebugLocking && (gAborting == 0)) { 14501ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogers CHECK(IsExclusiveHeld(self)) << *this; 14600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 14700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 14881d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertHeld(const Thread* self) { AssertExclusiveHeld(self); } 14900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 15000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Assert that the Mutex is not held by the current thread. 15181d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertNotHeldExclusive(const Thread* self) { 1523c539ffccabada93c404c0dfba8b52926ae06d0cAnwar Ghuloum if (kDebugLocking && (gAborting == 0)) { 15301ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogers CHECK(!IsExclusiveHeld(self)) << *this; 15400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 15500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 15681d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertNotHeld(const Thread* self) { AssertNotHeldExclusive(self); } 15700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 15800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Id associated with exclusive owner. 15900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers uint64_t GetExclusiveOwnerTid() const; 16000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 16100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Returns how many times this Mutex has been locked, it is better to use AssertHeld/NotHeld. 16200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers unsigned int GetDepth() const { 16300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers return recursion_count_; 16400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 16500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 16656edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers virtual void Dump(std::ostream& os) const; 16701ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogers 16800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers private: 169c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers#if ART_USE_FUTEXES 170c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // 0 is unheld, 1 is held. 171c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers volatile int32_t state_; 172c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // Exclusive owner. 173c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers volatile uint64_t exclusive_owner_; 174c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // Number of waiting contenders. 175c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers volatile int32_t num_contenders_; 176c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers#else 17700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers pthread_mutex_t mutex_; 178c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers#endif 17900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers const bool recursive_; // Can the lock be recursively held? 18000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers unsigned int recursion_count_; 181f1498437b0d6beb9f4f91980b98cbeb0b5c773ceElliott Hughes friend class ConditionVariable; 1823efb8416c9809a1da3300509fd9d2bc54e22e4c2Elliott Hughes friend class MutexTester; 1838daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes DISALLOW_COPY_AND_ASSIGN(Mutex); 1848daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes}; 1858daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 18600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// A ReaderWriterMutex is used to achieve mutual exclusion between threads, similar to a Mutex. 18700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Unlike a Mutex a ReaderWriterMutex can be used to gain exclusive (writer) or shared (reader) 18800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// access to what it guards. A flaw in relation to a Mutex is that it cannot be used with a 18900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// condition variable. A ReaderWriterMutex can be in one of three states: 19000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// - Free - not owned by any thread, 19100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// - Exclusive - owned by a single thread, 19200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// - Shared(n) - shared amongst n threads. 19300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// 19400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// The effect of locking and unlocking operations on the state is: 19500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// 19600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// State | ExclusiveLock | ExclusiveUnlock | SharedLock | SharedUnlock 19700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// ---------------------------------------------------------------------------- 19800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Free | Exclusive | error | SharedLock(1) | error 19900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Exclusive | Block | Free | Block | error 20000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Shared(n) | Block | error | SharedLock(n+1)* | Shared(n-1) or Free 20100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// * for large values of n the SharedLock may block. 20201ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogersstd::ostream& operator<<(std::ostream& os, const ReaderWriterMutex& mu); 20300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogersclass LOCKABLE ReaderWriterMutex : public BaseMutex { 2048daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes public: 20581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers explicit ReaderWriterMutex(const char* name, LockLevel level = kDefaultMutexLevel); 20600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers ~ReaderWriterMutex(); 20700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 20800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers virtual bool IsReaderWriterMutex() const { return true; } 20900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 21000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Block until ReaderWriterMutex is free then acquire exclusive access. 21181d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void ExclusiveLock(Thread* self) EXCLUSIVE_LOCK_FUNCTION(); 21281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void WriterLock(Thread* self) EXCLUSIVE_LOCK_FUNCTION() { ExclusiveLock(self); } 21300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 21400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Release exclusive access. 21581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void ExclusiveUnlock(Thread* self) UNLOCK_FUNCTION(); 21681d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void WriterUnlock(Thread* self) UNLOCK_FUNCTION() { ExclusiveUnlock(self); } 21700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 21800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Block until ReaderWriterMutex is free and acquire exclusive access. Returns true on success 21900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // or false if timeout is reached. 22066aee5cd571cf4739d2735769304202ea5051fb8Ian Rogers#if HAVE_TIMED_RWLOCK 221c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers bool ExclusiveLockWithTimeout(Thread* self, int64_t ms, int32_t ns) 22281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers EXCLUSIVE_TRYLOCK_FUNCTION(true); 22366aee5cd571cf4739d2735769304202ea5051fb8Ian Rogers#endif 22400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 22500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Block until ReaderWriterMutex is shared or free then acquire a share on the access. 2261ffa32f0be7becec4907b26ead353e4b17e1219cIan Rogers void SharedLock(Thread* self) SHARED_LOCK_FUNCTION() ALWAYS_INLINE; 22781d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void ReaderLock(Thread* self) SHARED_LOCK_FUNCTION() { SharedLock(self); } 22800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 22900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Try to acquire share of ReaderWriterMutex. 23081d425b0b232962441616f8b14f73620bffef5e5Ian Rogers bool SharedTryLock(Thread* self) EXCLUSIVE_TRYLOCK_FUNCTION(true); 23100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 23200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Release a share of the access. 2331ffa32f0be7becec4907b26ead353e4b17e1219cIan Rogers void SharedUnlock(Thread* self) UNLOCK_FUNCTION() ALWAYS_INLINE; 23481d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void ReaderUnlock(Thread* self) UNLOCK_FUNCTION() { SharedUnlock(self); } 23500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 23600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Is the current thread the exclusive holder of the ReaderWriterMutex. 23781d425b0b232962441616f8b14f73620bffef5e5Ian Rogers bool IsExclusiveHeld(const Thread* self) const; 23800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 23900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Assert the current thread has exclusive access to the ReaderWriterMutex. 24081d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertExclusiveHeld(const Thread* self) { 2413c539ffccabada93c404c0dfba8b52926ae06d0cAnwar Ghuloum if (kDebugLocking & (gAborting == 0)) { 24201ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogers CHECK(IsExclusiveHeld(self)) << *this; 24300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 2448daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes } 24581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertWriterHeld(const Thread* self) { AssertExclusiveHeld(self); } 2468daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 24700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Assert the current thread doesn't have exclusive access to the ReaderWriterMutex. 24881d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertNotExclusiveHeld(const Thread* self) { 2493c539ffccabada93c404c0dfba8b52926ae06d0cAnwar Ghuloum if (kDebugLocking & (gAborting == 0)) { 250e3359f7ad7671c5816f17145ca3a01516512e8d6Ian Rogers CHECK(!IsExclusiveHeld(self)) << *this; 25100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 25200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 25381d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertNotWriterHeld(const Thread* self) { AssertNotExclusiveHeld(self); } 25400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 25500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Is the current thread a shared holder of the ReaderWriterMutex. 25681d425b0b232962441616f8b14f73620bffef5e5Ian Rogers bool IsSharedHeld(const Thread* self) const; 25700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 25800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Assert the current thread has shared access to the ReaderWriterMutex. 25981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertSharedHeld(const Thread* self) { 2603c539ffccabada93c404c0dfba8b52926ae06d0cAnwar Ghuloum if (kDebugLocking & (gAborting == 0)) { 26123055dc5d7a90c4a12e259fd0ed7cd4d04d89182Ian Rogers // TODO: we can only assert this well when self != NULL. 26223055dc5d7a90c4a12e259fd0ed7cd4d04d89182Ian Rogers CHECK(IsSharedHeld(self) || self == NULL) << *this; 26300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 2648daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes } 26581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertReaderHeld(const Thread* self) { AssertSharedHeld(self); } 2668daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 26700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Assert the current thread doesn't hold this ReaderWriterMutex either in shared or exclusive 26800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // mode. 26981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers void AssertNotHeld(const Thread* self) { 2703c539ffccabada93c404c0dfba8b52926ae06d0cAnwar Ghuloum if (kDebugLocking && (gAborting == 0)) { 27101ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogers CHECK(!IsSharedHeld(self)) << *this; 27200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 27300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 27400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 27500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Id associated with exclusive owner. 27600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers uint64_t GetExclusiveOwnerTid() const; 27781d425b0b232962441616f8b14f73620bffef5e5Ian Rogers 27856edc432fa914f7ccfa87ce443e64f5ef475666dIan Rogers virtual void Dump(std::ostream& os) const; 27901ae5808367e641a983e3f8bb82b3e0d364cd03eIan Rogers 2808daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes private: 28181d425b0b232962441616f8b14f73620bffef5e5Ian Rogers#if ART_USE_FUTEXES 28281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers // -1 implies held exclusive, +ve shared held by state_ many owners. 28381d425b0b232962441616f8b14f73620bffef5e5Ian Rogers volatile int32_t state_; 28481d425b0b232962441616f8b14f73620bffef5e5Ian Rogers // Exclusive owner. 28581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers volatile uint64_t exclusive_owner_; 28681d425b0b232962441616f8b14f73620bffef5e5Ian Rogers // Pending readers. 28781d425b0b232962441616f8b14f73620bffef5e5Ian Rogers volatile int32_t num_pending_readers_; 28881d425b0b232962441616f8b14f73620bffef5e5Ian Rogers // Pending writers. 28981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers volatile int32_t num_pending_writers_; 29081d425b0b232962441616f8b14f73620bffef5e5Ian Rogers#else 29100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers pthread_rwlock_t rwlock_; 29281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers#endif 29300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers friend class MutexTester; 29400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers DISALLOW_COPY_AND_ASSIGN(ReaderWriterMutex); 2958daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes}; 2968daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 29700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// ConditionVariables allow threads to queue and sleep. Threads may then be resumed individually 29800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// (Signal) or all at once (Broadcast). 2995f79133a435ebcb20000370d56046fe01201dd80Elliott Hughesclass ConditionVariable { 3005f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes public: 30123055dc5d7a90c4a12e259fd0ed7cd4d04d89182Ian Rogers explicit ConditionVariable(const char* name, Mutex& mutex); 3025f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes ~ConditionVariable(); 3035f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 304c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers void Broadcast(Thread* self); 305c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers void Signal(Thread* self); 306c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // TODO: No thread safety analysis on Wait and TimedWait as they call mutex operations via their 307c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // pointer copy, thereby defeating annotalysis. 308c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers void Wait(Thread* self) NO_THREAD_SAFETY_ANALYSIS; 309c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers void TimedWait(Thread* self, int64_t ms, int32_t ns) NO_THREAD_SAFETY_ANALYSIS; 3101d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // Variant of Wait that should be used with caution. Doesn't validate that no mutexes are held 3111d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // when waiting. 3121d54e73444e017d3a65234e0f193846f3e27472bIan Rogers // TODO: remove this. 3131d54e73444e017d3a65234e0f193846f3e27472bIan Rogers void WaitHoldingLocks(Thread* self) NO_THREAD_SAFETY_ANALYSIS; 3145f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 3155f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes private: 31623055dc5d7a90c4a12e259fd0ed7cd4d04d89182Ian Rogers const char* const name_; 317c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // The Mutex being used by waiters. It is an error to mix condition variables between different 318c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // Mutexes. 319c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers Mutex& guard_; 320c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers#if ART_USE_FUTEXES 321c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // A counter that is modified by signals and broadcasts. This ensures that when a waiter gives up 322d45f201e9bd43490e30a35710865789b8d70e249Ian Rogers // their Mutex and another thread takes it and signals, the waiting thread observes that sequence_ 323d45f201e9bd43490e30a35710865789b8d70e249Ian Rogers // changed and doesn't enter the wait. Modified while holding guard_, but is read by futex wait 324d45f201e9bd43490e30a35710865789b8d70e249Ian Rogers // without guard_ held. 325d45f201e9bd43490e30a35710865789b8d70e249Ian Rogers volatile int32_t sequence_; 326c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers // Number of threads that have come into to wait, not the length of the waiters on the futex as 3275bd97c483c1de1eb97afe76123b1b9ab53095edfIan Rogers // waiters may have been requeued onto guard_. Guarded by guard_. 328c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers volatile int32_t num_waiters_; 329c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers#else 330c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers pthread_cond_t cond_; 331c604d731730b43231f63040c8db1d58304da0cf3Ian Rogers#endif 3325f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DISALLOW_COPY_AND_ASSIGN(ConditionVariable); 3335f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes}; 3345f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 33500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Scoped locker/unlocker for a regular Mutex that acquires mu upon construction and releases it 33600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// upon destruction. 33700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogersclass SCOPED_LOCKABLE MutexLock { 33800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers public: 33981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers explicit MutexLock(Thread* self, Mutex& mu) EXCLUSIVE_LOCK_FUNCTION(mu) : self_(self), mu_(mu) { 34081d425b0b232962441616f8b14f73620bffef5e5Ian Rogers mu_.ExclusiveLock(self_); 34181d425b0b232962441616f8b14f73620bffef5e5Ian Rogers } 34281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers 34300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers ~MutexLock() UNLOCK_FUNCTION() { 34481d425b0b232962441616f8b14f73620bffef5e5Ian Rogers mu_.ExclusiveUnlock(self_); 34500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 34600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 34700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers private: 34881d425b0b232962441616f8b14f73620bffef5e5Ian Rogers Thread* const self_; 34900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers Mutex& mu_; 35000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers DISALLOW_COPY_AND_ASSIGN(MutexLock); 35100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers}; 35200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Catch bug where variable name is omitted. "MutexLock (lock);" instead of "MutexLock mu(lock)". 35300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers#define MutexLock(x) COMPILE_ASSERT(0, mutex_lock_declaration_missing_variable_name) 35400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 35500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Scoped locker/unlocker for a ReaderWriterMutex that acquires read access to mu upon 35600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// construction and releases it upon destruction. 35700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogersclass SCOPED_LOCKABLE ReaderMutexLock { 35800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers public: 35981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers explicit ReaderMutexLock(Thread* self, ReaderWriterMutex& mu) EXCLUSIVE_LOCK_FUNCTION(mu) : 36081d425b0b232962441616f8b14f73620bffef5e5Ian Rogers self_(self), mu_(mu) { 36181d425b0b232962441616f8b14f73620bffef5e5Ian Rogers mu_.SharedLock(self_); 36281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers } 36381d425b0b232962441616f8b14f73620bffef5e5Ian Rogers 36400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers ~ReaderMutexLock() UNLOCK_FUNCTION() { 36581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers mu_.SharedUnlock(self_); 36600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 36700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 36800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers private: 36981d425b0b232962441616f8b14f73620bffef5e5Ian Rogers Thread* const self_; 37000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers ReaderWriterMutex& mu_; 37100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers DISALLOW_COPY_AND_ASSIGN(ReaderMutexLock); 37200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers}; 37300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Catch bug where variable name is omitted. "ReaderMutexLock (lock);" instead of 37400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// "ReaderMutexLock mu(lock)". 37500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers#define ReaderMutexLock(x) COMPILE_ASSERT(0, reader_mutex_lock_declaration_missing_variable_name) 37600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 37700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Scoped locker/unlocker for a ReaderWriterMutex that acquires write access to mu upon 37800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// construction and releases it upon destruction. 37900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogersclass SCOPED_LOCKABLE WriterMutexLock { 38000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers public: 38181d425b0b232962441616f8b14f73620bffef5e5Ian Rogers explicit WriterMutexLock(Thread* self, ReaderWriterMutex& mu) EXCLUSIVE_LOCK_FUNCTION(mu) : 38281d425b0b232962441616f8b14f73620bffef5e5Ian Rogers self_(self), mu_(mu) { 38381d425b0b232962441616f8b14f73620bffef5e5Ian Rogers mu_.ExclusiveLock(self_); 38481d425b0b232962441616f8b14f73620bffef5e5Ian Rogers } 38581d425b0b232962441616f8b14f73620bffef5e5Ian Rogers 38600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers ~WriterMutexLock() UNLOCK_FUNCTION() { 38781d425b0b232962441616f8b14f73620bffef5e5Ian Rogers mu_.ExclusiveUnlock(self_); 38800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 38900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 39000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers private: 39150b35e2fd1a68cd1240e4a9d9f363e11764957d1Ian Rogers Thread* const self_; 39200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers ReaderWriterMutex& mu_; 39300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers DISALLOW_COPY_AND_ASSIGN(WriterMutexLock); 39400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers}; 39500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// Catch bug where variable name is omitted. "WriterMutexLock (lock);" instead of 39600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers// "WriterMutexLock mu(lock)". 39700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers#define WriterMutexLock(x) COMPILE_ASSERT(0, writer_mutex_lock_declaration_missing_variable_name) 39800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 3998daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes} // namespace art 4008daa0929f08a3080ea64dbd4e997e72f411e6fc9Elliott Hughes 40176b6167407c2b6f5d40ad895b2793a6b037f54b2Elliott Hughes#endif // ART_SRC_BASE_MUTEX_H_ 402