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88 lines
2.1 KiB
88 lines
2.1 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 <mutex>
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#include <queue>
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namespace paddle {
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namespace framework {
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template <typename T>
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class Channel {
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public:
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explicit Channel(std::size_t capacity) : capacity_(capacity) {}
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void Send(T* channel_element) {
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std::unique_lock<std::mutex> lock(mu_);
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if (IsBounded()) {
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full_cond_var_.wait(lock, [this]() {
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bool capacity_valid = capacity_ > 0 ? !IsCapacityFull() : true;
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return capacity_valid;
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});
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}
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channel_.push_back(std::move(*channel_element));
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lock.unlock();
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empty_cond_var_.notify_one();
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}
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T* Receive() {
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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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T* channel_element = std::move(channel_.front());
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channel_.pop_front();
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NotifyAllSenders(&lock);
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return channel_element;
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}
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size_t Size() {
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std::unique_lock<std::mutex> lock(mu_);
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return channel_.size();
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}
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void Clear() {
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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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private:
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std::size_t capacity_;
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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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private:
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void NotifyAllSenders(std::unique_lock<std::mutex>* lock) {
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if (IsBounded()) {
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lock->unlock();
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full_cond_var_.notify_one();
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}
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}
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bool IsBounded() const { return capacity_ > 0; }
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bool IsCapacityFull() const { return channel_.size() >= capacity_; }
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};
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} // namespace operator
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} // namespace paddle
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