bungeman@google.com | d9947f6 | 2013-12-18 15:27:39 +0000 | [diff] [blame^] | 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_none_DEFINED |
| 9 | #define SkAtomics_none_DEFINED |
| 10 | |
| 11 | /** Non-atomic atomics for uniprocessor systems. */ |
| 12 | |
| 13 | #include <stdint.h> |
| 14 | |
| 15 | static inline int32_t sk_atomic_inc(int32_t* addr) { |
| 16 | int32_t value = *addr; |
| 17 | *addr = value + 1; |
| 18 | return value; |
| 19 | } |
| 20 | |
| 21 | static inline int32_t sk_atomic_add(int32_t* addr, int32_t inc) { |
| 22 | int32_t value = *addr; |
| 23 | *addr = value + inc; |
| 24 | return value; |
| 25 | } |
| 26 | |
| 27 | static inline int32_t sk_atomic_dec(int32_t* addr) { |
| 28 | int32_t value = *addr; |
| 29 | *addr = value - 1; |
| 30 | return value; |
| 31 | } |
| 32 | |
| 33 | static inline void sk_membar_acquire__after_atomic_dec() { } |
| 34 | |
| 35 | static inline int32_t sk_atomic_conditional_inc(int32_t* addr) { |
| 36 | int32_t value = *addr; |
| 37 | if (value != 0) ++*addr; |
| 38 | return value; |
| 39 | } |
| 40 | |
| 41 | static inline void sk_membar_acquire__after_atomic_conditional_inc() { } |
| 42 | |
| 43 | #endif |