1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/core/SkThread.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,108 @@
1.4 +/*
1.5 + * Copyright 2006 The Android Open Source Project
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#ifndef SkThread_DEFINED
1.12 +#define SkThread_DEFINED
1.13 +
1.14 +#include "SkTypes.h"
1.15 +
1.16 +// SK_ATOMICS_PLATFORM_H must provide inline implementations for the following declarations.
1.17 +
1.18 +/** Atomically adds one to the int referenced by addr and returns the previous value.
1.19 + * No additional memory barrier is required; this must act as a compiler barrier.
1.20 + */
1.21 +static int32_t sk_atomic_inc(int32_t* addr);
1.22 +
1.23 +/** Atomically adds inc to the int referenced by addr and returns the previous value.
1.24 + * No additional memory barrier is required; this must act as a compiler barrier.
1.25 + */
1.26 +static int32_t sk_atomic_add(int32_t* addr, int32_t inc);
1.27 +
1.28 +/** Atomically subtracts one from the int referenced by addr and returns the previous value.
1.29 + * This must act as a release (SL/S) memory barrier and as a compiler barrier.
1.30 + */
1.31 +static int32_t sk_atomic_dec(int32_t* addr);
1.32 +
1.33 +/** Atomically adds one to the int referenced by addr iff the referenced int was not 0
1.34 + * and returns the previous value.
1.35 + * No additional memory barrier is required; this must act as a compiler barrier.
1.36 + */
1.37 +static int32_t sk_atomic_conditional_inc(int32_t* addr);
1.38 +
1.39 +/** Atomic compare and set.
1.40 + * If *addr == before, set *addr to after and return true, otherwise return false.
1.41 + * This must act as a release (SL/S) memory barrier and as a compiler barrier.
1.42 + */
1.43 +static bool sk_atomic_cas(int32_t* addr, int32_t before, int32_t after);
1.44 +
1.45 +/** If sk_atomic_dec does not act as an acquire (L/SL) barrier,
1.46 + * this must act as an acquire (L/SL) memory barrier and as a compiler barrier.
1.47 + */
1.48 +static void sk_membar_acquire__after_atomic_dec();
1.49 +
1.50 +/** If sk_atomic_conditional_inc does not act as an acquire (L/SL) barrier,
1.51 + * this must act as an acquire (L/SL) memory barrier and as a compiler barrier.
1.52 + */
1.53 +static void sk_membar_acquire__after_atomic_conditional_inc();
1.54 +
1.55 +#include SK_ATOMICS_PLATFORM_H
1.56 +
1.57 +/** SK_MUTEX_PLATFORM_H must provide the following (or equivalent) declarations.
1.58 +
1.59 +class SkBaseMutex {
1.60 +public:
1.61 + void acquire();
1.62 + void release();
1.63 +};
1.64 +
1.65 +class SkMutex : SkBaseMutex {
1.66 +public:
1.67 + SkMutex();
1.68 + ~SkMutex();
1.69 +};
1.70 +
1.71 +#define SK_DECLARE_STATIC_MUTEX(name) static SkBaseMutex name = ...
1.72 +#define SK_DECLARE_GLOBAL_MUTEX(name) SkBaseMutex name = ...
1.73 +*/
1.74 +
1.75 +#include SK_MUTEX_PLATFORM_H
1.76 +
1.77 +
1.78 +class SkAutoMutexAcquire : SkNoncopyable {
1.79 +public:
1.80 + explicit SkAutoMutexAcquire(SkBaseMutex& mutex) : fMutex(&mutex) {
1.81 + SkASSERT(fMutex != NULL);
1.82 + mutex.acquire();
1.83 + }
1.84 +
1.85 + explicit SkAutoMutexAcquire(SkBaseMutex* mutex) : fMutex(mutex) {
1.86 + if (mutex) {
1.87 + mutex->acquire();
1.88 + }
1.89 + }
1.90 +
1.91 + /** If the mutex has not been released, release it now. */
1.92 + ~SkAutoMutexAcquire() {
1.93 + if (fMutex) {
1.94 + fMutex->release();
1.95 + }
1.96 + }
1.97 +
1.98 + /** If the mutex has not been released, release it now. */
1.99 + void release() {
1.100 + if (fMutex) {
1.101 + fMutex->release();
1.102 + fMutex = NULL;
1.103 + }
1.104 + }
1.105 +
1.106 +private:
1.107 + SkBaseMutex* fMutex;
1.108 +};
1.109 +#define SkAutoMutexAcquire(...) SK_REQUIRE_LOCAL_VAR(SkAutoMutexAcquire)
1.110 +
1.111 +#endif
