src/ports/SkAtomics_sync.h


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

/*
 * Copyright 2013 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkAtomics_sync_DEFINED
#define SkAtomics_sync_DEFINED

/** GCC/Clang __sync based atomics. */

#include <stdint.h>

static inline __attribute__((always_inline)) int32_t sk_atomic_inc(int32_t* addr) {
    return __sync_fetch_and_add(addr, 1);
}

static inline __attribute__((always_inline)) int32_t sk_atomic_add(int32_t* addr, int32_t inc) {
    return __sync_fetch_and_add(addr, inc);
}

static inline __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t* addr) {
    return __sync_fetch_and_add(addr, -1);
}

static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_dec() { }

static inline __attribute__((always_inline)) bool sk_atomic_cas(int32_t* addr,
                                                                int32_t before,
                                                                int32_t after) {
    return __sync_bool_compare_and_swap(addr, before, after);
}

static inline __attribute__((always_inline)) void* sk_atomic_cas(void** addr,
                                                                 void* before,
                                                                 void* after) {
    return __sync_val_compare_and_swap(addr, before, after);
}

static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_conditional_inc() { }

#endif