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comparison: gfx/skia/trunk/include/core/SkThread.h
gfx/skia/trunk/include/core/SkThread.h
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- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:24f689df34e3 |
|---|---|
| 1 /* | |
| 2 * Copyright 2006 The Android Open Source Project | |
| 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 SkThread_DEFINED | |
| 9 #define SkThread_DEFINED | |
| 10 | |
| 11 #include "SkTypes.h" | |
| 12 | |
| 13 // SK_ATOMICS_PLATFORM_H must provide inline implementations for the following declarations. | |
| 14 | |
| 15 /** Atomically adds one to the int referenced by addr and returns the previous value. | |
| 16 * No additional memory barrier is required; this must act as a compiler barrier. | |
| 17 */ | |
| 18 static int32_t sk_atomic_inc(int32_t* addr); | |
| 19 | |
| 20 /** Atomically adds inc to the int referenced by addr and returns the previous value. | |
| 21 * No additional memory barrier is required; this must act as a compiler barrier. | |
| 22 */ | |
| 23 static int32_t sk_atomic_add(int32_t* addr, int32_t inc); | |
| 24 | |
| 25 /** Atomically subtracts one from the int referenced by addr and returns the previous value. | |
| 26 * This must act as a release (SL/S) memory barrier and as a compiler barrier. | |
| 27 */ | |
| 28 static int32_t sk_atomic_dec(int32_t* addr); | |
| 29 | |
| 30 /** Atomically adds one to the int referenced by addr iff the referenced int was not 0 | |
| 31 * and returns the previous value. | |
| 32 * No additional memory barrier is required; this must act as a compiler barrier. | |
| 33 */ | |
| 34 static int32_t sk_atomic_conditional_inc(int32_t* addr); | |
| 35 | |
| 36 /** Atomic compare and set. | |
| 37 * If *addr == before, set *addr to after and return true, otherwise return false. | |
| 38 * This must act as a release (SL/S) memory barrier and as a compiler barrier. | |
| 39 */ | |
| 40 static bool sk_atomic_cas(int32_t* addr, int32_t before, int32_t after); | |
| 41 | |
| 42 /** If sk_atomic_dec does not act as an acquire (L/SL) barrier, | |
| 43 * this must act as an acquire (L/SL) memory barrier and as a compiler barrier. | |
| 44 */ | |
| 45 static void sk_membar_acquire__after_atomic_dec(); | |
| 46 | |
| 47 /** If sk_atomic_conditional_inc does not act as an acquire (L/SL) barrier, | |
| 48 * this must act as an acquire (L/SL) memory barrier and as a compiler barrier. | |
| 49 */ | |
| 50 static void sk_membar_acquire__after_atomic_conditional_inc(); | |
| 51 | |
| 52 #include SK_ATOMICS_PLATFORM_H | |
| 53 | |
| 54 /** SK_MUTEX_PLATFORM_H must provide the following (or equivalent) declarations. | |
| 55 | |
| 56 class SkBaseMutex { | |
| 57 public: | |
| 58 void acquire(); | |
| 59 void release(); | |
| 60 }; | |
| 61 | |
| 62 class SkMutex : SkBaseMutex { | |
| 63 public: | |
| 64 SkMutex(); | |
| 65 ~SkMutex(); | |
| 66 }; | |
| 67 | |
| 68 #define SK_DECLARE_STATIC_MUTEX(name) static SkBaseMutex name = ... | |
| 69 #define SK_DECLARE_GLOBAL_MUTEX(name) SkBaseMutex name = ... | |
| 70 */ | |
| 71 | |
| 72 #include SK_MUTEX_PLATFORM_H | |
| 73 | |
| 74 | |
| 75 class SkAutoMutexAcquire : SkNoncopyable { | |
| 76 public: | |
| 77 explicit SkAutoMutexAcquire(SkBaseMutex& mutex) : fMutex(&mutex) { | |
| 78 SkASSERT(fMutex != NULL); | |
| 79 mutex.acquire(); | |
| 80 } | |
| 81 | |
| 82 explicit SkAutoMutexAcquire(SkBaseMutex* mutex) : fMutex(mutex) { | |
| 83 if (mutex) { | |
| 84 mutex->acquire(); | |
| 85 } | |
| 86 } | |
| 87 | |
| 88 /** If the mutex has not been released, release it now. */ | |
| 89 ~SkAutoMutexAcquire() { | |
| 90 if (fMutex) { | |
| 91 fMutex->release(); | |
| 92 } | |
| 93 } | |
| 94 | |
| 95 /** If the mutex has not been released, release it now. */ | |
| 96 void release() { | |
| 97 if (fMutex) { | |
| 98 fMutex->release(); | |
| 99 fMutex = NULL; | |
| 100 } | |
| 101 } | |
| 102 | |
| 103 private: | |
| 104 SkBaseMutex* fMutex; | |
| 105 }; | |
| 106 #define SkAutoMutexAcquire(...) SK_REQUIRE_LOCAL_VAR(SkAutoMutexAcquire) | |
| 107 | |
| 108 #endif |
