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/**
* Copyright (C) ARM Limited 2010-2016. 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__
#ifdef WIN32
#include <windows.h>
#define sem_t HANDLE
#define sem_init(sem, pshared, value) ((*(sem) = CreateSemaphore(NULL, value, LONG_MAX, NULL)) == NULL)
#define sem_wait(sem) WaitForSingleObject(*(sem), INFINITE)
#define sem_post(sem) ReleaseSemaphore(*(sem), 1, NULL)
#define sem_destroy(sem) CloseHandle(*(sem))
#else
#include <semaphore.h>
#endif
class Fifo {
public:
Fifo(int singleBufferSize, int totalBufferSize, sem_t* readerSem);
~Fifo();
int numBytesFilled() const;
bool isEmpty() const;
bool isFull() const;
bool willFill(int additional) const;
char* start() const;
char* write(int length);
void release();
char* read(int *const length);
private:
int mSingleBufferSize, mWrite, mRead, mReadCommit, mRaggedEnd, mWrapThreshold;
sem_t mWaitForSpaceSem;
sem_t* mReaderSem;
char* mBuffer;
bool mEnd;
// Intentionally unimplemented
Fifo(const Fifo &);
Fifo &operator=(const Fifo &);
};
#endif //__FIFO_H__
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