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
15static inline __attribute__((always_inline)) int32_t sk_atomic_inc(int32_t* addr) {
16    return __sync_fetch_and_add(addr, 1);
17}
18
19static 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
23static inline __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t* addr) {
24    return __sync_fetch_and_add(addr, -1);
25}
26
27static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_dec() { }
28
29static inline __attribute__((always_inline)) bool sk_atomic_cas(int32_t* addr,
30                                                                int32_t before,
31                                                                int32_t after) {
32    return __sync_bool_compare_and_swap(addr, before, after);
33}
34
35static inline __attribute__((always_inline)) void* sk_atomic_cas(void** addr,
36                                                                 void* before,
37                                                                 void* after) {
38    return __sync_val_compare_and_swap(addr, before, after);
39}
40
41static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_conditional_inc() { }
42
43#endif
44