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83 lines
2.2 KiB
83 lines
2.2 KiB
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 <condition_variable>
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#include <deque>
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#include <mutex>
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#include "paddle/framework/channel.h"
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namespace paddle {
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namespace framework {
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namespace details {
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template <typename T>
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class Buffered : public paddle::framework::Channel<T> {
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friend Channel<T>* paddle::framework::MakeChannel<T>(size_t);
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friend void paddle::framework::CloseChannel<T>(Channel<T>*);
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public:
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virtual void Send(T*);
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virtual void Receive(T*);
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virtual size_t Cap() { return cap_; }
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private:
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size_t cap_;
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std::mutex mu_;
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std::condition_variable empty_cond_var_;
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std::condition_variable full_cond_var_;
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std::deque<T> channel_;
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Buffered(size_t cap) : cap_(cap) {}
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virtual ~Buffered();
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void NotifyAllSenders(std::unique_lock<std::mutex>*);
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};
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template <typename T>
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void Buffered<T>::Send(T* item) {
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std::unique_lock<std::mutex> lock(mu_);
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full_cond_var_.wait(lock, [this]() { return channel_.size() < cap_; });
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channel_.push_back(std::move(*item));
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lock.unlock();
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empty_cond_var_.notify_one();
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}
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template <typename T>
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void Buffered<T>::Receive(T* item) {
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std::unique_lock<std::mutex> lock(mu_);
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empty_cond_var_.wait(lock, [this]() { return !channel_.empty(); });
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*item = std::move(channel_.front());
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channel_.pop_front();
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NotifyAllSenders(&lock);
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}
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template <typename T>
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Buffered<T>::~Buffered() {
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std::unique_lock<std::mutex> lock(mu_);
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channel_.clear();
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NotifyAllSenders(&lock);
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}
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template <typename T>
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void Buffered<T>::NotifyAllSenders(std::unique_lock<std::mutex>* lock) {
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lock->unlock();
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full_cond_var_.notify_one();
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}
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} // namespace details
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} // namespace framework
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} // namespace paddle
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