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Simple Concurrent Queue
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| /** | |
| * @file concurrent_queue.hpp | |
| * @author M. Sami GÜRPINAR <sami.gurpinar@gmail.com> | |
| * | |
| * @brief | |
| * Implementation of concurrent_queue. | |
| * | |
| */ | |
| #pragma once | |
| #include <mutex> | |
| #include <condition_variable> | |
| #include <queue> | |
| template<typename T> | |
| class concurrent_queue { | |
| public: | |
| void push_back(T &&data); | |
| void push_back(const T &data); | |
| bool empty() const; | |
| bool try_pop(T &popped); | |
| void wait_and_pop(T &popped); | |
| private: | |
| template<typename... Args> | |
| void emplace_back(Args &&... args); | |
| mutable std::mutex mtx; | |
| mutable std::condition_variable cv; | |
| std::queue<T> m_queue; | |
| }; | |
| template<typename T> | |
| void concurrent_dequeue<T>::push_back(T &&data) { | |
| emplace_back(std::move(data)); | |
| } | |
| template<typename T> | |
| void concurrent_dequeue<T>::push_back(const T &data) { | |
| emplace_back(data); | |
| } | |
| template<typename T> | |
| bool concurrent_dequeue<T>::empty() const { | |
| std::lock_guard<std::mutex> lockg{mtx}; | |
| return m_queue.empty(); | |
| } | |
| template<typename T> | |
| bool concurrent_dequeue<T>::try_pop(T &popped) { | |
| std::unique_lock<std::mutex> lockq{mtx}; | |
| if (m_queue.empty()) | |
| return false; | |
| try { | |
| popped = std::move(m_queue.front()); | |
| m_queue.pop_front(); | |
| } catch (...) { | |
| return false; | |
| } | |
| return true; | |
| } | |
| template<typename T> | |
| void concurrent_dequeue<T>::wait_and_pop(T &popped) { | |
| std::unique_lock<std::mutex> lockq{mtx}; | |
| while (m_queue.empty()) | |
| cv.wait(lockq); | |
| try { | |
| popped = std::move(m_queue.front()); | |
| m_queue.pop_front(); | |
| } catch (...) {} | |
| } | |
| template<typename T> | |
| template<typename... Args> | |
| void concurrent_dequeue<T>::emplace_back(Args &&... args) { | |
| std::unique_lock<std::mutex> lockq{mtx}; | |
| m_queue.emplace_back(std::forward<Args>(args)...); | |
| cv.notify_one(); | |
| } |
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