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1 /* | 1 /* |
2 * Copyright 2015 Google Inc. | 2 * Copyright 2015 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 |
(...skipping 28 matching lines...) Expand all Loading... |
39 barrier(mo); | 39 barrier(mo); |
40 *ptr = val; | 40 *ptr = val; |
41 } | 41 } |
42 | 42 |
43 template <typename T> | 43 template <typename T> |
44 T sk_atomic_fetch_add(T* ptr, T val, sk_memory_order) { | 44 T sk_atomic_fetch_add(T* ptr, T val, sk_memory_order) { |
45 return __sync_fetch_and_add(ptr, val); | 45 return __sync_fetch_and_add(ptr, val); |
46 } | 46 } |
47 | 47 |
48 template <typename T> | 48 template <typename T> |
| 49 T sk_atomic_fetch_sub(T* ptr, T val, sk_memory_order) { |
| 50 return __sync_fetch_and_sub(ptr, val); |
| 51 } |
| 52 |
| 53 template <typename T> |
49 bool sk_atomic_compare_exchange(T* ptr, T* expected, T desired, sk_memory_order,
sk_memory_order) { | 54 bool sk_atomic_compare_exchange(T* ptr, T* expected, T desired, sk_memory_order,
sk_memory_order) { |
50 T prev = __sync_val_compare_and_swap(ptr, *expected, desired); | 55 T prev = __sync_val_compare_and_swap(ptr, *expected, desired); |
51 if (prev == *expected) { | 56 if (prev == *expected) { |
52 return true; | 57 return true; |
53 } | 58 } |
54 *expected = prev; | 59 *expected = prev; |
55 return false; | 60 return false; |
56 } | 61 } |
57 | 62 |
58 template <typename T> | 63 template <typename T> |
59 T sk_atomic_exchange(T* ptr, T val, sk_memory_order) { | 64 T sk_atomic_exchange(T* ptr, T val, sk_memory_order) { |
60 // There is no __sync exchange. Emulate it with a CAS loop. | 65 // There is no __sync exchange. Emulate it with a CAS loop. |
61 T prev; | 66 T prev; |
62 do { | 67 do { |
63 prev = sk_atomic_load(ptr); | 68 prev = sk_atomic_load(ptr); |
64 } while(!sk_atomic_compare_exchange(ptr, &prev, val)); | 69 } while(!sk_atomic_compare_exchange(ptr, &prev, val)); |
65 return prev; | 70 return prev; |
66 } | 71 } |
67 | 72 |
68 #endif//SkAtomics_sync_DEFINED | 73 #endif//SkAtomics_sync_DEFINED |
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