源于lmms
代碼如下:
#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 );
}
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;
} ;