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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 // This file is not part of the public Skia API. | 8 // This file is not part of the public Skia API. |
9 | 9 |
10 #ifndef SkSpinlock_DEFINED | 10 #ifndef SkSpinlock_DEFINED |
11 #define SkSpinlock_DEFINED | 11 #define SkSpinlock_DEFINED |
12 | 12 |
13 #include "SkAtomics.h" | 13 #include "../private/SkAtomics.h" |
14 | 14 |
15 #define SK_DECLARE_STATIC_SPINLOCK(name) namespace {} static SkPODSpinlock name | 15 #define SK_DECLARE_STATIC_SPINLOCK(name) namespace {} static SkPODSpinlock name |
16 | 16 |
17 // This class has no constructor and must be zero-initialized (the macro above d
oes this). | 17 // This class has no constructor and must be zero-initialized (the macro above d
oes this). |
18 class SK_API SkPODSpinlock { | 18 class SK_API SkPODSpinlock { |
19 public: | 19 public: |
20 void acquire() { | 20 void acquire() { |
21 // To act as a mutex, we need an acquire barrier if we take the lock. | 21 // To act as a mutex, we need an acquire barrier if we take the lock. |
22 if (sk_atomic_exchange(&fLocked, true, sk_memory_order_acquire)) { | 22 if (sk_atomic_exchange(&fLocked, true, sk_memory_order_acquire)) { |
23 // Lock was contended. Fall back to an out-of-line spin loop. | 23 // Lock was contended. Fall back to an out-of-line spin loop. |
(...skipping 11 matching lines...) Expand all Loading... |
35 bool fLocked; | 35 bool fLocked; |
36 }; | 36 }; |
37 | 37 |
38 // For non-global-static use cases, this is normally what you want. | 38 // For non-global-static use cases, this is normally what you want. |
39 class SkSpinlock : public SkPODSpinlock { | 39 class SkSpinlock : public SkPODSpinlock { |
40 public: | 40 public: |
41 SkSpinlock() { this->release(); } | 41 SkSpinlock() { this->release(); } |
42 }; | 42 }; |
43 | 43 |
44 #endif//SkSpinlock_DEFINED | 44 #endif//SkSpinlock_DEFINED |
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