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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_RENDERER_RASTERIZER_SKIA_SKIA_SRC_PORTS_SKBARRIERS_COBALT_H_
#define COBALT_RENDERER_RASTERIZER_SKIA_SKIA_SRC_PORTS_SKBARRIERS_COBALT_H_
#include "base/atomicops.h"
#include "cobalt/renderer/rasterizer/skia/skia/src/ports/atomic_type_conversions.h"
template <typename T, bool compatible_with_atomics>
class SkAcquireReleaseWithAtomicCompatibility {};
template <typename T>
class SkAcquireReleaseWithAtomicCompatibility<T, false> {
public:
// If we don't have a Chromium Base atomics compatible type, issue full memory
// barriers.
static T DoAcquireLoad(T* ptr) {
bool ret = *ptr;
SbAtomicMemoryBarrier();
return ret;
}
static void DoReleaseStore(T* ptr, T val) {
SbAtomicMemoryBarrier();
*ptr = val;
}
};
template <typename T>
class SkAcquireReleaseWithAtomicCompatibility<T, true> {
public:
// If the type we are dealing with is compatible with Chromium's base
// atomics library, take advantage of those specialized calls.
static T DoAcquireLoad(T* ptr) {
typedef typename AtomicTraits<T>::atomic_type AtomicType;
AtomicType* as_atomic = reinterpret_cast<AtomicType*>(ptr);
return AtomicTypeConversionPolicy<T>::FromAtomic(
base::subtle::Acquire_Load(as_atomic));
}
static void DoReleaseStore(T* ptr, T val) {
typedef typename AtomicTraits<T>::atomic_type AtomicType;
AtomicType* as_atomic = reinterpret_cast<AtomicType*>(ptr);
base::subtle::Release_Store(as_atomic,
AtomicTypeConversionPolicy<T>::ToAtomic(val));
}
};
template <typename T>
class SkAcquireRelease : public SkAcquireReleaseWithAtomicCompatibility<
T, AtomicTraits<T>::compatible_with_atomics> {};
template <typename T>
T sk_acquire_load(T* ptr) {
return SkAcquireRelease<T>::DoAcquireLoad(ptr);
}
template <typename T>
T sk_consume_load(T* ptr) {
return sk_acquire_load(ptr);
}
template <typename T>
void sk_release_store(T* ptr, T val) {
SkAcquireRelease<T>::DoReleaseStore(ptr, val);
}
#endif // COBALT_RENDERER_RASTERIZER_SKIA_SKIA_SRC_PORTS_SKBARRIERS_COBALT_H_