a669bc7a7a
This merges and refactors SkAtomics.h and SkBarriers.h into SkAtomics.h and some ports/ implementations. The major new feature is that we can express memory orders explicitly rather than only through comments. The porting layer is reduced to four template functions: - sk_atomic_load - sk_atomic_store - sk_atomic_fetch_add - sk_atomic_compare_exchange From those four we can reconstruct all our previous sk_atomic_foo. There are three ports: - SkAtomics_std: uses C++11 <atomic>, used with MSVC - SkAtomics_atomic: uses newer GCC/Clang intrinsics, used on not-MSVC where possible - SkAtomics_sync: uses older GCC/Clang intrinsics, used where SkAtomics_atomic not supported No public API changes. TBR=reed@google.com BUG=skia: Review URL: https://codereview.chromium.org/896553002
37 lines
1.4 KiB
C++
37 lines
1.4 KiB
C++
#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) {
|
|
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) {
|
|
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) {
|
|
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>
|
|
bool sk_atomic_compare_exchange(T* ptr, T* expected, T desired,
|
|
sk_memory_order success,
|
|
sk_memory_order failure) {
|
|
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);
|
|
}
|
|
|
|
#endif//SkAtomics_std_DEFINED
|