// Copyright (c) 2018 PaddlePaddle Authors. 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.
#pragma once
#include <memory>
#include <mutex>   // NOLINT
#include <thread>  // NOLINT
#include "paddle/fluid/memory/allocation/allocator.h"

namespace paddle {
namespace memory {
namespace allocation {

// A allocator to make underlying allocator thread safe.
class LockedAllocator : public UnmanagedAllocator {
 public:
  explicit LockedAllocator(std::unique_ptr<Allocator>&& underlying_allocator);
  std::unique_ptr<Allocation> Allocate(size_t size,
                                       Attr attr = kDefault) override;
  void FreeUniquePtr(std::unique_ptr<Allocation> allocation) override;
  bool IsAllocThreadSafe() const override;

 private:
  std::unique_ptr<UnmanagedAllocator> underlying_allocator_;
  std::mutex mtx_;
};

}  // namespace allocation
}  // namespace memory
}  // namespace paddle