gfx/skia/trunk/include/utils/SkCondVar.h@b8a032363ba2 (annotated)
gfx/skia/trunk/include/utils/SkCondVar.h
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright 2012 Google Inc. |
| michael@0 | 3 | * |
| michael@0 | 4 | * Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 5 | * found in the LICENSE file. |
| michael@0 | 6 | */ |
| michael@0 | 7 | |
| michael@0 | 8 | #ifndef SkCondVar_DEFINED |
| michael@0 | 9 | #define SkCondVar_DEFINED |
| michael@0 | 10 | |
| michael@0 | 11 | #ifdef SK_USE_POSIX_THREADS |
| michael@0 | 12 | #include <pthread.h> |
| michael@0 | 13 | #elif defined(SK_BUILD_FOR_WIN32) |
| michael@0 | 14 | #include <windows.h> |
| michael@0 | 15 | #endif |
| michael@0 | 16 | |
| michael@0 | 17 | /** |
| michael@0 | 18 | * Condition variable for blocking access to shared data from other threads and |
| michael@0 | 19 | * controlling which threads are awake. |
| michael@0 | 20 | * |
| michael@0 | 21 | * Currently only supported on platforms with posix threads and Windows Vista and |
| michael@0 | 22 | * above. |
| michael@0 | 23 | */ |
| michael@0 | 24 | class SkCondVar { |
| michael@0 | 25 | public: |
| michael@0 | 26 | SkCondVar(); |
| michael@0 | 27 | ~SkCondVar(); |
| michael@0 | 28 | |
| michael@0 | 29 | /** |
| michael@0 | 30 | * Lock a mutex. Must be done before calling the other functions on this object. |
| michael@0 | 31 | */ |
| michael@0 | 32 | void lock(); |
| michael@0 | 33 | |
| michael@0 | 34 | /** |
| michael@0 | 35 | * Unlock the mutex. |
| michael@0 | 36 | */ |
| michael@0 | 37 | void unlock(); |
| michael@0 | 38 | |
| michael@0 | 39 | /** |
| michael@0 | 40 | * Pause the calling thread. Will be awoken when signal() or broadcast() is called. |
| michael@0 | 41 | * Must be called while lock() is held (but gives it up while waiting). Once awoken, |
| michael@0 | 42 | * the calling thread will hold the lock once again. |
| michael@0 | 43 | */ |
| michael@0 | 44 | void wait(); |
| michael@0 | 45 | |
| michael@0 | 46 | /** |
| michael@0 | 47 | * Wake one thread waiting on this condition. Must be called while lock() |
| michael@0 | 48 | * is held. |
| michael@0 | 49 | */ |
| michael@0 | 50 | void signal(); |
| michael@0 | 51 | |
| michael@0 | 52 | /** |
| michael@0 | 53 | * Wake all threads waiting on this condition. Must be called while lock() |
| michael@0 | 54 | * is held. |
| michael@0 | 55 | */ |
| michael@0 | 56 | void broadcast(); |
| michael@0 | 57 | |
| michael@0 | 58 | private: |
| michael@0 | 59 | #ifdef SK_USE_POSIX_THREADS |
| michael@0 | 60 | pthread_mutex_t fMutex; |
| michael@0 | 61 | pthread_cond_t fCond; |
| michael@0 | 62 | #elif defined(SK_BUILD_FOR_WIN32) |
| michael@0 | 63 | CRITICAL_SECTION fCriticalSection; |
| michael@0 | 64 | CONDITION_VARIABLE fCondition; |
| michael@0 | 65 | #endif |
| michael@0 | 66 | }; |
| michael@0 | 67 | |
| michael@0 | 68 | #endif |
