56 lines
1.5 KiB
56 lines
1.5 KiB
// Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include <stdint.h>
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#include <memory>
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#include <mutex> // NOLINT
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namespace paddle {
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namespace platform {
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/**
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* LockGuard for std::unique_ptr<LockType>. It will do nothing when guarded ptr
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* is nullptr.
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*
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* The advantage of using `LockGuardPtr` instead of
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* std::unique<std::lock_guard<lock_type>> is this type is totally a stack
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* variable. There is no heap allocation at all.
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*/
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template <typename LockType>
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class LockGuardPtr {
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public:
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explicit LockGuardPtr(std::unique_ptr<LockType>& lock_ptr) // NOLINT
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: lock_(lock_ptr.get()) {
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if (lock_) {
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lock_->lock();
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}
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}
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~LockGuardPtr() {
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if (lock_) {
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lock_->unlock();
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}
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}
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LockGuardPtr(const LockGuardPtr&) = delete;
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LockGuardPtr& operator=(const LockGuardPtr&) = delete;
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LockGuardPtr(LockGuardPtr&&) = delete;
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LockGuardPtr& operator=(LockGuardPtr&&) = delete;
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private:
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LockType* lock_;
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};
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} // namespace platform
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} // namespace paddle
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