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1 /* | 1 /* |
2 * Copyright 2013 Google Inc. | 2 * Copyright 2013 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef SkAtomics_sync_DEFINED | 8 #ifndef SkAtomics_sync_DEFINED |
9 #define SkAtomics_sync_DEFINED | 9 #define SkAtomics_sync_DEFINED |
10 | 10 |
11 /** GCC/Clang __sync based atomics. */ | 11 /** GCC/Clang __sync based atomics. */ |
12 | 12 |
13 #include <stdint.h> | 13 #include <stdint.h> |
14 | 14 |
15 static inline __attribute__((always_inline)) int32_t sk_atomic_inc(int32_t* addr
) { | 15 static inline __attribute__((always_inline)) int32_t sk_atomic_inc(int32_t* addr
) { |
16 return __sync_fetch_and_add(addr, 1); | 16 return __sync_fetch_and_add(addr, 1); |
17 } | 17 } |
18 | 18 |
19 static inline __attribute__((always_inline)) int32_t sk_atomic_add(int32_t* addr
, int32_t inc) { | 19 static inline __attribute__((always_inline)) int32_t sk_atomic_add(int32_t* addr
, int32_t inc) { |
20 return __sync_fetch_and_add(addr, inc); | 20 return __sync_fetch_and_add(addr, inc); |
21 } | 21 } |
22 | 22 |
23 static inline __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t* addr
) { | 23 static inline __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t* addr
) { |
24 return __sync_fetch_and_add(addr, -1); | 24 return __sync_fetch_and_add(addr, -1); |
25 } | 25 } |
26 | 26 |
27 static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomi
c_dec() { } | 27 static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomi
c_dec() { } |
28 | 28 |
29 static inline __attribute__((always_inline)) int32_t sk_atomic_conditional_inc(i
nt32_t* addr) { | |
30 int32_t value = *addr; | |
31 | |
32 while (true) { | |
33 if (value == 0) { | |
34 return 0; | |
35 } | |
36 | |
37 int32_t before = __sync_val_compare_and_swap(addr, value, value + 1); | |
38 | |
39 if (before == value) { | |
40 return value; | |
41 } else { | |
42 value = before; | |
43 } | |
44 } | |
45 } | |
46 | |
47 static inline __attribute__((always_inline)) bool sk_atomic_cas(int32_t* addr, | 29 static inline __attribute__((always_inline)) bool sk_atomic_cas(int32_t* addr, |
48 int32_t before, | 30 int32_t before, |
49 int32_t after) { | 31 int32_t after) { |
50 return __sync_bool_compare_and_swap(addr, before, after); | 32 return __sync_bool_compare_and_swap(addr, before, after); |
51 } | 33 } |
52 | 34 |
53 static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomi
c_conditional_inc() { } | 35 static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomi
c_conditional_inc() { } |
54 | 36 |
55 #endif | 37 #endif |
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