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comparison: gfx/skia/trunk/src/ports/SkMutex_pthread.h
gfx/skia/trunk/src/ports/SkMutex_pthread.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:e750d33e8788 |
|---|---|
| 1 /* | |
| 2 * Copyright 2013 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 SkMutex_pthread_DEFINED | |
| 9 #define SkMutex_pthread_DEFINED | |
| 10 | |
| 11 /** Posix pthread_mutex based mutex. */ | |
| 12 | |
| 13 #ifdef SK_DEBUG_PTHREAD_MUTEX | |
| 14 #include "SkTypes.h" | |
| 15 #define SkDEBUGCODE_PTHREAD_MUTEX(code) code | |
| 16 #else | |
| 17 #define SkDEBUGCODE_PTHREAD_MUTEX(code) | |
| 18 #ifndef SkDebugf | |
| 19 void SkDebugf(const char format[], ...); | |
| 20 #endif | |
| 21 #endif | |
| 22 | |
| 23 #include <errno.h> | |
| 24 #include <pthread.h> | |
| 25 | |
| 26 // A SkBaseMutex is a POD structure that can be directly initialized | |
| 27 // at declaration time with SK_DECLARE_STATIC/GLOBAL_MUTEX. This avoids the | |
| 28 // generation of a static initializer in the final machine code (and | |
| 29 // a corresponding static finalizer). | |
| 30 struct SkBaseMutex { | |
| 31 void acquire() { pthread_mutex_lock(&fMutex); } | |
| 32 void release() { pthread_mutex_unlock(&fMutex); } | |
| 33 pthread_mutex_t fMutex; | |
| 34 }; | |
| 35 | |
| 36 // A normal mutex that requires to be initialized through normal C++ construction, | |
| 37 // i.e. when it's a member of another class, or allocated on the heap. | |
| 38 class SkMutex : public SkBaseMutex { | |
| 39 public: | |
| 40 SkMutex() { | |
| 41 SkDEBUGCODE_PTHREAD_MUTEX(int status = )pthread_mutex_init(&fMutex, NULL); | |
| 42 SkDEBUGCODE_PTHREAD_MUTEX( | |
| 43 if (status != 0) { | |
| 44 print_pthread_error(status); | |
| 45 SkASSERT(0 == status); | |
| 46 } | |
| 47 ) | |
| 48 } | |
| 49 | |
| 50 ~SkMutex() { | |
| 51 SkDEBUGCODE_PTHREAD_MUTEX(int status = )pthread_mutex_destroy(&fMutex); | |
| 52 SkDEBUGCODE_PTHREAD_MUTEX( | |
| 53 if (status != 0) { | |
| 54 print_pthread_error(status); | |
| 55 SkASSERT(0 == status); | |
| 56 } | |
| 57 ) | |
| 58 } | |
| 59 | |
| 60 private: | |
| 61 SkMutex(const SkMutex&); | |
| 62 SkMutex& operator=(const SkMutex&); | |
| 63 | |
| 64 static void print_pthread_error(int status) { | |
| 65 switch (status) { | |
| 66 case 0: // success | |
| 67 break; | |
| 68 case EINVAL: | |
| 69 SkDebugf("pthread error [%d] EINVAL\n", status); | |
| 70 break; | |
| 71 case EBUSY: | |
| 72 SkDebugf("pthread error [%d] EBUSY\n", status); | |
| 73 break; | |
| 74 default: | |
| 75 SkDebugf("pthread error [%d] unknown\n", status); | |
| 76 break; | |
| 77 } | |
| 78 } | |
| 79 }; | |
| 80 | |
| 81 // Using POD-style initialization prevents the generation of a static initializer. | |
| 82 #define SK_DECLARE_STATIC_MUTEX(name) static SkBaseMutex name = { PTHREAD_MUTEX_INITIALIZER } | |
| 83 | |
| 84 // Special case used when the static mutex must be available globally. | |
| 85 #define SK_DECLARE_GLOBAL_MUTEX(name) SkBaseMutex name = { PTHREAD_MUTEX_INITIALIZER } | |
| 86 | |
| 87 #endif |
