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comparison: gfx/skia/trunk/include/utils/SkCondVar.h
gfx/skia/trunk/include/utils/SkCondVar.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:fd37ccb60cc6 |
|---|---|
| 1 /* | |
| 2 * Copyright 2012 Google Inc. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #ifndef SkCondVar_DEFINED | |
| 9 #define SkCondVar_DEFINED | |
| 10 | |
| 11 #ifdef SK_USE_POSIX_THREADS | |
| 12 #include <pthread.h> | |
| 13 #elif defined(SK_BUILD_FOR_WIN32) | |
| 14 #include <windows.h> | |
| 15 #endif | |
| 16 | |
| 17 /** | |
| 18 * Condition variable for blocking access to shared data from other threads and | |
| 19 * controlling which threads are awake. | |
| 20 * | |
| 21 * Currently only supported on platforms with posix threads and Windows Vista and | |
| 22 * above. | |
| 23 */ | |
| 24 class SkCondVar { | |
| 25 public: | |
| 26 SkCondVar(); | |
| 27 ~SkCondVar(); | |
| 28 | |
| 29 /** | |
| 30 * Lock a mutex. Must be done before calling the other functions on this object. | |
| 31 */ | |
| 32 void lock(); | |
| 33 | |
| 34 /** | |
| 35 * Unlock the mutex. | |
| 36 */ | |
| 37 void unlock(); | |
| 38 | |
| 39 /** | |
| 40 * Pause the calling thread. Will be awoken when signal() or broadcast() is called. | |
| 41 * Must be called while lock() is held (but gives it up while waiting). Once awoken, | |
| 42 * the calling thread will hold the lock once again. | |
| 43 */ | |
| 44 void wait(); | |
| 45 | |
| 46 /** | |
| 47 * Wake one thread waiting on this condition. Must be called while lock() | |
| 48 * is held. | |
| 49 */ | |
| 50 void signal(); | |
| 51 | |
| 52 /** | |
| 53 * Wake all threads waiting on this condition. Must be called while lock() | |
| 54 * is held. | |
| 55 */ | |
| 56 void broadcast(); | |
| 57 | |
| 58 private: | |
| 59 #ifdef SK_USE_POSIX_THREADS | |
| 60 pthread_mutex_t fMutex; | |
| 61 pthread_cond_t fCond; | |
| 62 #elif defined(SK_BUILD_FOR_WIN32) | |
| 63 CRITICAL_SECTION fCriticalSection; | |
| 64 CONDITION_VARIABLE fCondition; | |
| 65 #endif | |
| 66 }; | |
| 67 | |
| 68 #endif |
