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122 lines
2.6 KiB
122 lines
2.6 KiB
/**
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* Copyright 2019-2020 Huawei Technologies Co., Ltd
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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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*/
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#ifndef INC_COMMON_BLOCKING_QUEUE_H_
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#define INC_COMMON_BLOCKING_QUEUE_H_
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#include <stdint.h>
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#include <condition_variable>
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#include <list>
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#include <mutex>
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static const int kDefaultMaxQueueSize = 2048;
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template <typename T>
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class BlockingQueue {
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public:
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explicit BlockingQueue(uint32_t max_size = kDefaultMaxQueueSize) : max_size_(max_size), is_stoped_(false) {}
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~BlockingQueue() {}
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bool Pop(T &item) {
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std::unique_lock<std::mutex> lock(mutex_);
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while (queue_.empty() && !is_stoped_) {
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empty_cond_.wait(lock);
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}
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if (is_stoped_) {
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return false;
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}
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item = queue_.front();
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queue_.pop_front();
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full_cond_.notify_one();
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return true;
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}
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bool Push(const T &item, bool is_wait = true) {
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std::unique_lock<std::mutex> lock(mutex_);
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while (queue_.size() >= max_size_ && !is_stoped_) {
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if (!is_wait) {
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return false;
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}
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full_cond_.wait(lock);
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}
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if (is_stoped_) {
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return false;
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}
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queue_.push_back(item);
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empty_cond_.notify_one();
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return true;
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}
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void Stop() {
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{
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std::unique_lock<std::mutex> lock(mutex_);
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is_stoped_ = true;
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}
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full_cond_.notify_all();
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empty_cond_.notify_all();
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}
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void Restart() {
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std::unique_lock<std::mutex> lock(mutex_);
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is_stoped_ = false;
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}
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// if the queue stop , the function to release the unprocessed items will be call
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std::list<T> GetRemainItems() {
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std::unique_lock<std::mutex> lock(mutex_);
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if (!is_stoped_) {
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return std::list<T>();
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}
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return queue_;
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}
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bool IsFull() {
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std::unique_lock<std::mutex> lock(mutex_);
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return queue_.size() >= max_size_;
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}
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void Clear() {
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std::unique_lock<std::mutex> lock(mutex_);
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queue_.clear();
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}
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private:
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std::list<T> queue_;
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std::mutex mutex_;
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std::condition_variable empty_cond_;
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std::condition_variable full_cond_;
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uint32_t max_size_;
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bool is_stoped_;
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};
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#endif // INC_COMMON_BLOCKING_QUEUE_H_
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