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/**
* Copyright (C) ARM Limited 2010-2011. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __FIFO_H__
#define __FIFO_H__
#include <semaphore.h>
// Driver buffer size is 512k, large buffer mode with 2GB of total RAM will allocate 256M
#define FIFO_BUFFER_LIMIT 256*1024/512
class Fifo {
public:
Fifo(int numBuffers, int bufferSize);
~Fifo();
int depth(void);
int numReadToWriteBuffersFilled();
int numWriteToReadBuffersFilled();
int numReadToWriteBuffersEmpty() {return depth() - numReadToWriteBuffersFilled();}
int numWriteToReadBuffersEmpty() {return depth() - numWriteToReadBuffersFilled();}
char* start();
char* write(int length);
char* read(int* length);
private:
int mNumBuffers;
int mBufferSize;
int mWriteCurrent;
int mReadCurrent;
sem_t mReadToWriteSem[FIFO_BUFFER_LIMIT];
sem_t mWriteToReadSem[FIFO_BUFFER_LIMIT];
char* mBuffer[FIFO_BUFFER_LIMIT];
int mLength[FIFO_BUFFER_LIMIT];
};
#endif //__FIFO_H__
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