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