The Tor Browser / file comparison
comparison: gfx/skia/trunk/src/ports/SkAtomics_sync.h
gfx/skia/trunk/src/ports/SkAtomics_sync.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:a77205312243 |
|---|---|
| 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_sync_DEFINED | |
| 9 #define SkAtomics_sync_DEFINED | |
| 10 | |
| 11 /** GCC/Clang __sync based atomics. */ | |
| 12 | |
| 13 #include <stdint.h> | |
| 14 | |
| 15 static inline __attribute__((always_inline)) int32_t sk_atomic_inc(int32_t* addr) { | |
| 16 return __sync_fetch_and_add(addr, 1); | |
| 17 } | |
| 18 | |
| 19 static inline __attribute__((always_inline)) int32_t sk_atomic_add(int32_t* addr, int32_t inc) { | |
| 20 return __sync_fetch_and_add(addr, inc); | |
| 21 } | |
| 22 | |
| 23 static inline __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t* addr) { | |
| 24 return __sync_fetch_and_add(addr, -1); | |
| 25 } | |
| 26 | |
| 27 static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_dec() { } | |
| 28 | |
| 29 static inline __attribute__((always_inline)) int32_t sk_atomic_conditional_inc(int32_t* addr) { | |
| 30 int32_t value = *addr; | |
| 31 | |
| 32 while (true) { | |
| 33 if (value == 0) { | |
| 34 return 0; | |
| 35 } | |
| 36 | |
| 37 int32_t before = __sync_val_compare_and_swap(addr, value, value + 1); | |
| 38 | |
| 39 if (before == value) { | |
| 40 return value; | |
| 41 } else { | |
| 42 value = before; | |
| 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 return __sync_bool_compare_and_swap(addr, before, after); | |
| 51 } | |
| 52 | |
| 53 static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_conditional_inc() { } | |
| 54 | |
| 55 #endif |
