Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2013 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/base/platform/mutex.h" |
| 6 | |
| 7 | #include <errno.h> |
| 8 | |
| 9 | namespace v8 { |
| 10 | namespace base { |
| 11 | |
| 12 | #if V8_OS_POSIX |
| 13 | |
| 14 | static V8_INLINE void InitializeNativeHandle(pthread_mutex_t* mutex) { |
| 15 | int result; |
| 16 | #if defined(DEBUG) |
| 17 | // Use an error checking mutex in debug mode. |
| 18 | pthread_mutexattr_t attr; |
| 19 | result = pthread_mutexattr_init(&attr); |
| 20 | DCHECK_EQ(0, result); |
| 21 | result = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK); |
| 22 | DCHECK_EQ(0, result); |
| 23 | result = pthread_mutex_init(mutex, &attr); |
| 24 | DCHECK_EQ(0, result); |
| 25 | result = pthread_mutexattr_destroy(&attr); |
| 26 | #else |
| 27 | // Use a fast mutex (default attributes). |
| 28 | result = pthread_mutex_init(mutex, NULL); |
| 29 | #endif // defined(DEBUG) |
| 30 | DCHECK_EQ(0, result); |
| 31 | USE(result); |
| 32 | } |
| 33 | |
| 34 | |
| 35 | static V8_INLINE void InitializeRecursiveNativeHandle(pthread_mutex_t* mutex) { |
| 36 | pthread_mutexattr_t attr; |
| 37 | int result = pthread_mutexattr_init(&attr); |
| 38 | DCHECK_EQ(0, result); |
| 39 | result = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); |
| 40 | DCHECK_EQ(0, result); |
| 41 | result = pthread_mutex_init(mutex, &attr); |
| 42 | DCHECK_EQ(0, result); |
| 43 | result = pthread_mutexattr_destroy(&attr); |
| 44 | DCHECK_EQ(0, result); |
| 45 | USE(result); |
| 46 | } |
| 47 | |
| 48 | |
| 49 | static V8_INLINE void DestroyNativeHandle(pthread_mutex_t* mutex) { |
| 50 | int result = pthread_mutex_destroy(mutex); |
| 51 | DCHECK_EQ(0, result); |
| 52 | USE(result); |
| 53 | } |
| 54 | |
| 55 | |
| 56 | static V8_INLINE void LockNativeHandle(pthread_mutex_t* mutex) { |
| 57 | int result = pthread_mutex_lock(mutex); |
| 58 | DCHECK_EQ(0, result); |
| 59 | USE(result); |
| 60 | } |
| 61 | |
| 62 | |
| 63 | static V8_INLINE void UnlockNativeHandle(pthread_mutex_t* mutex) { |
| 64 | int result = pthread_mutex_unlock(mutex); |
| 65 | DCHECK_EQ(0, result); |
| 66 | USE(result); |
| 67 | } |
| 68 | |
| 69 | |
| 70 | static V8_INLINE bool TryLockNativeHandle(pthread_mutex_t* mutex) { |
| 71 | int result = pthread_mutex_trylock(mutex); |
| 72 | if (result == EBUSY) { |
| 73 | return false; |
| 74 | } |
| 75 | DCHECK_EQ(0, result); |
| 76 | return true; |
| 77 | } |
| 78 | |
| 79 | #elif V8_OS_WIN |
| 80 | |
| 81 | static V8_INLINE void InitializeNativeHandle(PCRITICAL_SECTION cs) { |
| 82 | InitializeCriticalSection(cs); |
| 83 | } |
| 84 | |
| 85 | |
| 86 | static V8_INLINE void InitializeRecursiveNativeHandle(PCRITICAL_SECTION cs) { |
| 87 | InitializeCriticalSection(cs); |
| 88 | } |
| 89 | |
| 90 | |
| 91 | static V8_INLINE void DestroyNativeHandle(PCRITICAL_SECTION cs) { |
| 92 | DeleteCriticalSection(cs); |
| 93 | } |
| 94 | |
| 95 | |
| 96 | static V8_INLINE void LockNativeHandle(PCRITICAL_SECTION cs) { |
| 97 | EnterCriticalSection(cs); |
| 98 | } |
| 99 | |
| 100 | |
| 101 | static V8_INLINE void UnlockNativeHandle(PCRITICAL_SECTION cs) { |
| 102 | LeaveCriticalSection(cs); |
| 103 | } |
| 104 | |
| 105 | |
| 106 | static V8_INLINE bool TryLockNativeHandle(PCRITICAL_SECTION cs) { |
| 107 | return TryEnterCriticalSection(cs); |
| 108 | } |
| 109 | |
| 110 | #endif // V8_OS_POSIX |
| 111 | |
| 112 | |
| 113 | Mutex::Mutex() { |
| 114 | InitializeNativeHandle(&native_handle_); |
| 115 | #ifdef DEBUG |
| 116 | level_ = 0; |
| 117 | #endif |
| 118 | } |
| 119 | |
| 120 | |
| 121 | Mutex::~Mutex() { |
| 122 | DestroyNativeHandle(&native_handle_); |
| 123 | DCHECK_EQ(0, level_); |
| 124 | } |
| 125 | |
| 126 | |
| 127 | void Mutex::Lock() { |
| 128 | LockNativeHandle(&native_handle_); |
| 129 | AssertUnheldAndMark(); |
| 130 | } |
| 131 | |
| 132 | |
| 133 | void Mutex::Unlock() { |
| 134 | AssertHeldAndUnmark(); |
| 135 | UnlockNativeHandle(&native_handle_); |
| 136 | } |
| 137 | |
| 138 | |
| 139 | bool Mutex::TryLock() { |
| 140 | if (!TryLockNativeHandle(&native_handle_)) { |
| 141 | return false; |
| 142 | } |
| 143 | AssertUnheldAndMark(); |
| 144 | return true; |
| 145 | } |
| 146 | |
| 147 | |
| 148 | RecursiveMutex::RecursiveMutex() { |
| 149 | InitializeRecursiveNativeHandle(&native_handle_); |
| 150 | #ifdef DEBUG |
| 151 | level_ = 0; |
| 152 | #endif |
| 153 | } |
| 154 | |
| 155 | |
| 156 | RecursiveMutex::~RecursiveMutex() { |
| 157 | DestroyNativeHandle(&native_handle_); |
| 158 | DCHECK_EQ(0, level_); |
| 159 | } |
| 160 | |
| 161 | |
| 162 | void RecursiveMutex::Lock() { |
| 163 | LockNativeHandle(&native_handle_); |
| 164 | #ifdef DEBUG |
| 165 | DCHECK_LE(0, level_); |
| 166 | level_++; |
| 167 | #endif |
| 168 | } |
| 169 | |
| 170 | |
| 171 | void RecursiveMutex::Unlock() { |
| 172 | #ifdef DEBUG |
| 173 | DCHECK_LT(0, level_); |
| 174 | level_--; |
| 175 | #endif |
| 176 | UnlockNativeHandle(&native_handle_); |
| 177 | } |
| 178 | |
| 179 | |
| 180 | bool RecursiveMutex::TryLock() { |
| 181 | if (!TryLockNativeHandle(&native_handle_)) { |
| 182 | return false; |
| 183 | } |
| 184 | #ifdef DEBUG |
| 185 | DCHECK_LE(0, level_); |
| 186 | level_++; |
| 187 | #endif |
| 188 | return true; |
| 189 | } |
| 190 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 191 | } // namespace base |
| 192 | } // namespace v8 |