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)) int64_t sk_atomic_inc(int64_t* addr) {
20#if defined(__mips__) && !defined(__LP64__) && !defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8)
21    /** Some versions of the GCC 32-bit MIPS toolchains (e.g. 4.8) for android are missing
22     * support for the __sync* functions that operate on 64-bit values. The workaround
23     * is to use __atomic* functions until we can move everything to <stdatomic.h>.
24     */
25    return __atomic_fetch_add(addr, 1, __ATOMIC_SEQ_CST);
26#else
27    return __sync_fetch_and_add(addr, 1);
28#endif
29}
30
31static inline __attribute__((always_inline)) int32_t sk_atomic_add(int32_t* addr, int32_t inc) {
32    return __sync_fetch_and_add(addr, inc);
33}
34
35static inline __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t* addr) {
36    return __sync_fetch_and_add(addr, -1);
37}
38
39static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_dec() { }
40
41static inline __attribute__((always_inline)) bool sk_atomic_cas(int32_t* addr,
42                                                                int32_t before,
43                                                                int32_t after) {
44    return __sync_bool_compare_and_swap(addr, before, after);
45}
46
47static inline __attribute__((always_inline)) void* sk_atomic_cas(void** addr,
48                                                                 void* before,
49                                                                 void* after) {
50    return __sync_val_compare_and_swap(addr, before, after);
51}
52
53static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_conditional_inc() { }
54
55#endif
56