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/*
* fifo_buffer.h - FIFO fixed-size buffer
*
* Copyright (c) 2007 Javier Serrano Polo <jasp00/at/users.sourceforge.net>
*
* This file is part of LMMS - https://lmms.io
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program (see COPYING); if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*
*/
#ifndef FIFO_BUFFER_H
#define FIFO_BUFFER_H
#include <QtCore/QSemaphore>
template<typename T>
class fifoBuffer
{
public:
fifoBuffer( int _size ) :
m_reader_sem( _size ),
m_writer_sem( _size ),
m_reader_index( 0 ),
m_writer_index( 0 ),
m_size( _size )
{
m_buffer = new T[_size];
m_reader_sem.acquire( _size );
}
~fifoBuffer()
{
delete[] m_buffer;
m_reader_sem.release( m_size );
}
void write( T _element )
{
m_writer_sem.acquire();
m_buffer[m_writer_index++] = _element;
m_writer_index %= m_size;
m_reader_sem.release();
}
T read()
{
m_reader_sem.acquire();
T element = m_buffer[m_reader_index++];
m_reader_index %= m_size;
m_writer_sem.release();
return( element );
}
void waitUntilRead()
{
m_writer_sem.acquire( m_size );
m_writer_sem.release( m_size );
}
bool available()
{
return( m_reader_sem.available() );
}
private:
QSemaphore m_reader_sem;
QSemaphore m_writer_sem;
int m_reader_index;
int m_writer_index;
int m_size;
T * m_buffer;
} ;
#endif
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