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| 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 "SkTypes.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_atomi
c_dec() { } |
| 28 |
| 29 static inline __attribute__((always_inline)) int32_t sk_atomic_conditional_inc(i
nt32_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)) void sk_membar_acquire__after_atomi
c_conditional_inc() { } |
| 48 |
| 49 #endif |
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