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125 lines
2.8 KiB
C++
125 lines
2.8 KiB
C++
/*
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* AudioEngineWorkerThread.h - declaration of class AudioEngineWorkerThread
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*
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* Copyright (c) 2009-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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*
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* This file is part of LMMS - https://lmms.io
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU 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 program 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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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef AUDIO_ENGINE_WORKER_THREAD_H
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#define AUDIO_ENGINE_WORKER_THREAD_H
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#include <QThread>
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#include <atomic>
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class QWaitCondition;
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namespace lmms
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{
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class AudioEngine;
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class ThreadableJob;
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class AudioEngineWorkerThread : public QThread
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{
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Q_OBJECT
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public:
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// internal representation of the job queue - all functions are thread-safe
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class JobQueue
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{
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public:
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enum OperationMode
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{
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Static, // no jobs added while processing queue
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Dynamic // jobs can be added while processing queue
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} ;
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static constexpr size_t JOB_QUEUE_SIZE = 8192;
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JobQueue() :
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m_items(),
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m_writeIndex( 0 ),
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m_itemsDone( 0 ),
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m_opMode( Static )
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{
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std::fill(m_items, m_items + JOB_QUEUE_SIZE, nullptr);
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}
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void reset( OperationMode _opMode );
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void addJob( ThreadableJob * _job );
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void run();
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void wait();
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private:
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std::atomic<ThreadableJob*> m_items[JOB_QUEUE_SIZE];
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std::atomic_int m_writeIndex;
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std::atomic_int m_itemsDone;
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OperationMode m_opMode;
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} ;
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AudioEngineWorkerThread( AudioEngine* audioEngine );
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~AudioEngineWorkerThread() override;
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virtual void quit();
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static void resetJobQueue( JobQueue::OperationMode _opMode =
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JobQueue::Static )
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{
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globalJobQueue.reset( _opMode );
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}
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static void addJob( ThreadableJob * _job )
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{
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globalJobQueue.addJob( _job );
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}
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// a convenient helper function allowing to pass a container with pointers
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// to ThreadableJob objects
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template<typename T>
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static void fillJobQueue( const T & _vec,
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JobQueue::OperationMode _opMode = JobQueue::Static )
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{
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resetJobQueue( _opMode );
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for( typename T::ConstIterator it = _vec.begin(); it != _vec.end(); ++it )
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{
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addJob( *it );
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}
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}
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static void startAndWaitForJobs();
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private:
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void run() override;
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static JobQueue globalJobQueue;
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static QWaitCondition * queueReadyWaitCond;
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static QList<AudioEngineWorkerThread *> workerThreads;
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volatile bool m_quit;
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} ;
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} // namespace lmms
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#endif
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