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// Copyright 2020 The Dawn Authors
//
// 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 SRC_DAWN_NATIVE_POOLEDRESOURCEMEMORYALLOCATOR_H_
#define SRC_DAWN_NATIVE_POOLEDRESOURCEMEMORYALLOCATOR_H_
#include <deque>
#include <memory>
#include "dawn/common/SerialQueue.h"
#include "dawn/native/ResourceHeapAllocator.h"
namespace dawn::native {
class DeviceBase;
// |PooledResourceMemoryAllocator| allocates a fixed-size resource memory from a resource memory
// pool. Internally, it manages a list of heaps using LIFO (newest heaps are recycled first).
// The heap is in one of two states: AVAILABLE or not. Upon de-allocate, the heap is returned
// the pool and made AVAILABLE.
class PooledResourceMemoryAllocator : public ResourceHeapAllocator {
public:
explicit PooledResourceMemoryAllocator(ResourceHeapAllocator* heapAllocator);
~PooledResourceMemoryAllocator() override;
ResultOrError<std::unique_ptr<ResourceHeapBase>> AllocateResourceHeap(uint64_t size) override;
void DeallocateResourceHeap(std::unique_ptr<ResourceHeapBase> allocation) override;
void DestroyPool();
// For testing purposes.
uint64_t GetPoolSizeForTesting() const;
private:
ResourceHeapAllocator* mHeapAllocator = nullptr;
std::deque<std::unique_ptr<ResourceHeapBase>> mPool;
};
} // namespace dawn::native
#endif // SRC_DAWN_NATIVE_POOLEDRESOURCEMEMORYALLOCATOR_H_