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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkAtomics_std_DEFINED
#define SkAtomics_std_DEFINED
// We try not to depend on the C++ standard library,
// but these uses of <atomic> should all inline, so we don't feel to bad here.
#include <atomic>
template <typename T>
T sk_atomic_load(const T* ptr, sk_memory_order mo) {
SkASSERT(mo == sk_memory_order_relaxed ||
mo == sk_memory_order_seq_cst ||
mo == sk_memory_order_acquire ||
mo == sk_memory_order_consume);
const std::atomic<T>* ap = reinterpret_cast<const std::atomic<T>*>(ptr);
return std::atomic_load_explicit(ap, (std::memory_order)mo);
}
template <typename T>
void sk_atomic_store(T* ptr, T val, sk_memory_order mo) {
SkASSERT(mo == sk_memory_order_relaxed ||
mo == sk_memory_order_seq_cst ||
mo == sk_memory_order_release);
std::atomic<T>* ap = reinterpret_cast<std::atomic<T>*>(ptr);
return std::atomic_store_explicit(ap, val, (std::memory_order)mo);
}
template <typename T>
T sk_atomic_fetch_add(T* ptr, T val, sk_memory_order mo) {
// All values of mo are valid.
std::atomic<T>* ap = reinterpret_cast<std::atomic<T>*>(ptr);
return std::atomic_fetch_add_explicit(ap, val, (std::memory_order)mo);
}
template <typename T>
T sk_atomic_fetch_sub(T* ptr, T val, sk_memory_order mo) {
// All values of mo are valid.
std::atomic<T>* ap = reinterpret_cast<std::atomic<T>*>(ptr);
return std::atomic_fetch_sub_explicit(ap, val, (std::memory_order)mo);
}
template <typename T>
bool sk_atomic_compare_exchange(T* ptr, T* expected, T desired,
sk_memory_order success,
sk_memory_order failure) {
// All values of success are valid.
SkASSERT(failure == sk_memory_order_relaxed ||
failure == sk_memory_order_seq_cst ||
failure == sk_memory_order_acquire ||
failure == sk_memory_order_consume);
SkASSERT(failure <= success);
std::atomic<T>* ap = reinterpret_cast<std::atomic<T>*>(ptr);
return std::atomic_compare_exchange_strong_explicit(ap, expected, desired,
(std::memory_order)success,
(std::memory_order)failure);
}
template <typename T>
T sk_atomic_exchange(T* ptr, T val, sk_memory_order mo) {
// All values of mo are valid.
std::atomic<T>* ap = reinterpret_cast<std::atomic<T>*>(ptr);
return std::atomic_exchange_explicit(ap, val, (std::memory_order)mo);
}
#endif//SkAtomics_std_DEFINED
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