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1 #ifndef SkAtomics_DEFINED | 1 #ifndef SkAtomics_DEFINED |
2 #define SkAtomics_DEFINED | 2 #define SkAtomics_DEFINED |
3 | 3 |
4 // This file is not part of the public Skia API. | 4 // This file is not part of the public Skia API. |
5 #include "SkTypes.h" | 5 #include "SkTypes.h" |
6 | 6 |
7 enum sk_memory_order { | 7 enum sk_memory_order { |
8 sk_memory_order_relaxed, | 8 sk_memory_order_relaxed, |
9 sk_memory_order_consume, | 9 sk_memory_order_consume, |
10 sk_memory_order_acquire, | 10 sk_memory_order_acquire, |
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35 SkAtomic() {} | 35 SkAtomic() {} |
36 | 36 |
37 // It is essential we return by value rather than by const&. fVal may chang
e at any time. | 37 // It is essential we return by value rather than by const&. fVal may chang
e at any time. |
38 T load(sk_memory_order mo = sk_memory_order_seq_cst) const { | 38 T load(sk_memory_order mo = sk_memory_order_seq_cst) const { |
39 return sk_atomic_load(&fVal, mo); | 39 return sk_atomic_load(&fVal, mo); |
40 } | 40 } |
41 | 41 |
42 void store(const T& val, sk_memory_order mo = sk_memory_order_seq_cst) { | 42 void store(const T& val, sk_memory_order mo = sk_memory_order_seq_cst) { |
43 sk_atomic_store(&fVal, val, mo); | 43 sk_atomic_store(&fVal, val, mo); |
44 } | 44 } |
| 45 |
| 46 bool compare_exchange(T* expected, const T& desired, |
| 47 sk_memory_order success = sk_memory_order_seq_cst, |
| 48 sk_memory_order failure = sk_memory_order_seq_cst) { |
| 49 return sk_atomic_compare_exchange(&fVal, expected, desired, success, fai
lure); |
| 50 } |
45 private: | 51 private: |
46 T fVal; | 52 T fVal; |
47 }; | 53 }; |
48 | 54 |
49 #if defined(_MSC_VER) | 55 #if defined(_MSC_VER) |
50 #include "../ports/SkAtomics_std.h" | 56 #include "../ports/SkAtomics_std.h" |
51 #elif !defined(SK_BUILD_FOR_IOS) && defined(__ATOMIC_RELAXED) | 57 #elif !defined(SK_BUILD_FOR_IOS) && defined(__ATOMIC_RELAXED) |
52 #include "../ports/SkAtomics_atomic.h" | 58 #include "../ports/SkAtomics_atomic.h" |
53 #else | 59 #else |
54 #include "../ports/SkAtomics_sync.h" | 60 #include "../ports/SkAtomics_sync.h" |
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86 template <typename T> | 92 template <typename T> |
87 T sk_acquire_load(T* ptr) { return sk_atomic_load(ptr, sk_memory_order_acquire);
} | 93 T sk_acquire_load(T* ptr) { return sk_atomic_load(ptr, sk_memory_order_acquire);
} |
88 | 94 |
89 template <typename T> | 95 template <typename T> |
90 void sk_release_store(T* ptr, T val) { sk_atomic_store(ptr, val, sk_memory_order
_release); } | 96 void sk_release_store(T* ptr, T val) { sk_atomic_store(ptr, val, sk_memory_order
_release); } |
91 | 97 |
92 inline void sk_membar_acquire__after_atomic_dec() {} | 98 inline void sk_membar_acquire__after_atomic_dec() {} |
93 inline void sk_membar_acquire__after_atomic_conditional_inc() {} | 99 inline void sk_membar_acquire__after_atomic_conditional_inc() {} |
94 | 100 |
95 #endif//SkAtomics_DEFINED | 101 #endif//SkAtomics_DEFINED |
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