101 lines
2.2 KiB
C++
101 lines
2.2 KiB
C++
/*
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* Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license: https://github.com/azerothcore/azerothcore-wotlk/blob/master/LICENSE-GPL2
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* Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
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* Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
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*/
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#ifndef _PCQ_H
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#define _PCQ_H
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#include <condition_variable>
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#include <mutex>
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#include <queue>
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#include <atomic>
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#include <type_traits>
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template <typename T>
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class ProducerConsumerQueue
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{
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private:
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std::mutex _queueLock;
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std::queue<T> _queue;
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std::condition_variable _condition;
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std::atomic<bool> _shutdown;
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public:
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ProducerConsumerQueue<T>() : _shutdown(false) { }
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void Push(const T& value)
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{
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std::lock_guard<std::mutex> lock(_queueLock);
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_queue.push(std::move(value));
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_condition.notify_one();
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}
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bool Empty()
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{
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std::lock_guard<std::mutex> lock(_queueLock);
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return _queue.empty();
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}
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bool Pop(T& value)
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{
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std::lock_guard<std::mutex> lock(_queueLock);
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if (_queue.empty() || _shutdown)
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return false;
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value = _queue.front();
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_queue.pop();
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return true;
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}
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void WaitAndPop(T& value)
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{
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std::unique_lock<std::mutex> lock(_queueLock);
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// we could be using .wait(lock, predicate) overload here but it is broken
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// https://connect.microsoft.com/VisualStudio/feedback/details/1098841
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while (_queue.empty() && !_shutdown)
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_condition.wait(lock);
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if (_queue.empty() || _shutdown)
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return;
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value = _queue.front();
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_queue.pop();
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}
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void Cancel()
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{
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std::unique_lock<std::mutex> lock(_queueLock);
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while (!_queue.empty())
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{
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T& value = _queue.front();
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DeleteQueuedObject(value);
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_queue.pop();
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}
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_shutdown = true;
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_condition.notify_all();
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}
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private:
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template<typename E = T>
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typename std::enable_if<std::is_pointer<E>::value>::type DeleteQueuedObject(E& obj) { delete obj; }
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template<typename E = T>
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typename std::enable_if<!std::is_pointer<E>::value>::type DeleteQueuedObject(E const& /*packet*/) { }
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};
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#endif
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