blob: 9a4fe7a6e65f347ab8c91a8306d87eefb08b7c14 (
plain)
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
44
45
46
47
48
49
50
51
52
53
54
55
|
/*
* 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)) int32_t sk_atomic_conditional_inc(int32_t* addr) {
int32_t value = *addr;
while (true) {
if (value == 0) {
return 0;
}
int32_t before = __sync_val_compare_and_swap(addr, value, value + 1);
if (before == value) {
return value;
} else {
value = before;
}
}
}
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_membar_acquire__after_atomic_conditional_inc() { }
#endif
|
