The Tor Browser / file comparison
comparison: gfx/skia/trunk/src/ports/SkAtomics_android.h
gfx/skia/trunk/src/ports/SkAtomics_android.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:593f142c9bb8 |
|---|---|
| 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 SkAtomics_android_DEFINED | |
| 9 #define SkAtomics_android_DEFINED | |
| 10 | |
| 11 /** Android framework atomics. */ | |
| 12 | |
| 13 #include <cutils/atomic.h> | |
| 14 #include <stdint.h> | |
| 15 | |
| 16 static inline __attribute__((always_inline)) int32_t sk_atomic_inc(int32_t* addr) { | |
| 17 return android_atomic_inc(addr); | |
| 18 } | |
| 19 | |
| 20 static inline __attribute__((always_inline)) int32_t sk_atomic_add(int32_t* addr, int32_t inc) { | |
| 21 return android_atomic_add(inc, addr); | |
| 22 } | |
| 23 | |
| 24 static inline __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t* addr) { | |
| 25 return android_atomic_dec(addr); | |
| 26 } | |
| 27 | |
| 28 static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_dec() { | |
| 29 //HACK: Android is actually using full memory barriers. | |
| 30 // Should this change, uncomment below. | |
| 31 //int dummy; | |
| 32 //android_atomic_acquire_store(0, &dummy); | |
| 33 } | |
| 34 | |
| 35 static inline __attribute__((always_inline)) int32_t sk_atomic_conditional_inc(int32_t* addr) { | |
| 36 while (true) { | |
| 37 int32_t value = *addr; | |
| 38 if (value == 0) { | |
| 39 return 0; | |
| 40 } | |
| 41 if (0 == android_atomic_release_cas(value, value + 1, addr)) { | |
| 42 return value; | |
| 43 } | |
| 44 } | |
| 45 } | |
| 46 | |
| 47 static inline __attribute__((always_inline)) bool sk_atomic_cas(int32_t* addr, | |
| 48 int32_t before, | |
| 49 int32_t after) { | |
| 50 // android_atomic_release_cas returns 0 for success (if *addr == before and it wrote after). | |
| 51 return android_atomic_release_cas(before, after, addr) == 0; | |
| 52 } | |
| 53 | |
| 54 static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_conditional_inc() { | |
| 55 //HACK: Android is actually using full memory barriers. | |
| 56 // Should this change, uncomment below. | |
| 57 //int dummy; | |
| 58 //android_atomic_acquire_store(0, &dummy); | |
| 59 } | |
| 60 | |
| 61 #endif |
