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/*
* Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license, you may redistribute it and/or modify it under version 2 of the License, or (at your option), any later version.
* Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
* Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
*/
#ifndef _PCQ_H
#define _PCQ_H
#include <condition_variable>
#include <mutex>
#include <queue>
#include <atomic>
#include <type_traits>
template <typename T>
class ProducerConsumerQueue
{
private:
std::mutex _queueLock;
std::queue<T> _queue;
std::condition_variable _condition;
std::atomic<bool> _shutdown;
public:
ProducerConsumerQueue<T>() : _shutdown(false) { }
void Push(const T& value)
{
std::lock_guard<std::mutex> lock(_queueLock);
_queue.push(std::move(value));
_condition.notify_one();
}
bool Empty()
{
std::lock_guard<std::mutex> lock(_queueLock);
return _queue.empty();
}
bool Pop(T& value)
{
std::lock_guard<std::mutex> lock(_queueLock);
if (_queue.empty() || _shutdown)
return false;
value = _queue.front();
_queue.pop();
return true;
}
void WaitAndPop(T& value)
{
std::unique_lock<std::mutex> lock(_queueLock);
// we could be using .wait(lock, predicate) overload here but it is broken
// https://connect.microsoft.com/VisualStudio/feedback/details/1098841
while (_queue.empty() && !_shutdown)
_condition.wait(lock);
if (_queue.empty() || _shutdown)
return;
value = _queue.front();
_queue.pop();
}
void Cancel()
{
std::unique_lock<std::mutex> lock(_queueLock);
while (!_queue.empty())
{
T& value = _queue.front();
DeleteQueuedObject(value);
_queue.pop();
}
_shutdown = true;
_condition.notify_all();
}
private:
template<typename E = T>
typename std::enable_if<std::is_pointer<E>::value>::type DeleteQueuedObject(E& obj) { delete obj; }
template<typename E = T>
typename std::enable_if < !std::is_pointer<E>::value >::type DeleteQueuedObject(E const& /*packet*/) { }
};
#endif
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