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e7f5fb8977
git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@480 0778d3d1-df1d-0410-868b-ea421aaaa00d
122 lines
2.2 KiB
C++
122 lines
2.2 KiB
C++
/*
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* fifo_buffer.h - FIFO fixed-size buffer
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*
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* Copyright (c) 2007 Javier Serrano Polo <jasp00/at/users.sourceforge.net>
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*
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* This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
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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 _FIFO_BUFFER_H
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#define _FIFO_BUFFER_H
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#ifndef QT3
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#include <QtCore/QSemaphore>
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#else
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#include <qsemaphore.h>
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#endif
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template<typename T>
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class fifoBuffer
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{
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public:
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fifoBuffer( int _size ) :
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m_reader_sem( _size ),
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m_writer_sem( _size ),
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m_reader_index( 0 ),
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m_writer_index( 0 ),
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m_size( _size )
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{
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m_buffer = new T[_size];
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#ifndef QT3
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m_reader_sem.acquire( _size );
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#else
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m_reader_sem += _size;
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#endif
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}
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~fifoBuffer()
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{
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delete[] m_buffer;
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#ifndef QT3
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m_reader_sem.release( m_size );
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#else
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m_reader_sem -= m_size;
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#endif
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}
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void write( T _element )
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{
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#ifndef QT3
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m_writer_sem.acquire();
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#else
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m_writer_sem++;
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#endif
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m_buffer[m_writer_index++] = _element;
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m_writer_index %= m_size;
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#ifndef QT3
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m_reader_sem.release();
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#else
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m_reader_sem--;
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#endif
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}
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T read( void )
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{
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#ifndef QT3
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m_reader_sem.acquire();
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#else
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m_reader_sem++;
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#endif
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T element = m_buffer[m_reader_index++];
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m_reader_index %= m_size;
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#ifndef QT3
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m_writer_sem.release();
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#else
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m_writer_sem--;
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#endif
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return( element );
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}
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bool available( void )
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{
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return( m_reader_sem.available() );
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}
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private:
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QSemaphore m_reader_sem;
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QSemaphore m_writer_sem;
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int m_reader_index;
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int m_writer_index;
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int m_size;
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T * m_buffer;
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} ;
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#endif
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