blob: 68a6ff7b1246bcd216327a683a36d75148f2845b [file] [log] [blame]
* 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 {
SkSpinlock() { this->release(); }