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77 lines
2 KiB
C++
77 lines
2 KiB
C++
/*
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* GStreamer
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* Copyright (C) 2009 Andrey Nechypurenko <andreynech@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __ASYNCQUEUE_H
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#define __ASYNCQUEUE_H
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#include <QMutex>
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#include <QWaitCondition>
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#include <QList>
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/**
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* This is the thread safe implementation of the Queue. It can be
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* used in classical producers/consumers multithreaded scenario. The
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* template parameter is the class which can be put/get to/from the
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* queue.
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*/
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template<class T>
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class AsyncQueue
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{
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public:
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AsyncQueue() : waitingReaders(0) {}
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int size()
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{
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QMutexLocker locker(&mutex);
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return this->buffer.size();
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}
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void put(const T& item)
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{
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QMutexLocker locker(&mutex);
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this->buffer.push_back(item);
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if(this->waitingReaders)
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this->bufferIsNotEmpty.wakeOne();
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}
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T get()
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{
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QMutexLocker locker(&mutex);
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while(this->buffer.size() == 0)
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{
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++(this->waitingReaders);
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this->bufferIsNotEmpty.wait(&mutex);
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--(this->waitingReaders);
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}
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T item = this->buffer.front();
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this->buffer.pop_front();
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return item;
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}
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private:
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typedef QList<T> Container;
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QMutex mutex;
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QWaitCondition bufferIsNotEmpty;
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Container buffer;
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short waitingReaders;
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};
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#endif // __ASYNCQUEUE_H
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