| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| // This file is not part of the public Skia API. |
| |
| #ifndef SkSpinlock_DEFINED |
| #define SkSpinlock_DEFINED |
| |
| #include "SkAtomics.h" |
| |
| #define SK_DECLARE_STATIC_SPINLOCK(name) namespace {} static SkPODSpinlock name |
| |
| // This class has no constructor and must be zero-initialized (the macro above does this). |
| struct SkPODSpinlock { |
| void acquire() { |
| // To act as a mutex, we need an acquire barrier. |
| while(sk_atomic_exchange(&fLocked, true, sk_memory_order_acquire)) { /*spin*/ } |
| } |
| void release() { |
| // To act as a mutex, we need a release barrier. |
| sk_atomic_store(&fLocked, false, sk_memory_order_release); |
| } |
| |
| bool fLocked; |
| }; |
| |
| // For non-global-static use cases, this is normally what you want. |
| class SkSpinlock : public SkPODSpinlock { |
| public: |
| SkSpinlock() { this->release(); } |
| }; |
| |
| #endif//SkSpinlock_DEFINED |