49 lines
1.2 KiB
C++
49 lines
1.2 KiB
C++
/**
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* Copyright (C) ARM Limited 2010-2014. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __FIFO_H__
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#define __FIFO_H__
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#ifdef WIN32
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#include <windows.h>
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#define sem_t HANDLE
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#define sem_init(sem, pshared, value) ((*(sem) = CreateSemaphore(NULL, value, LONG_MAX, NULL)) == NULL)
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#define sem_wait(sem) WaitForSingleObject(*(sem), INFINITE)
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#define sem_post(sem) ReleaseSemaphore(*(sem), 1, NULL)
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#define sem_destroy(sem) CloseHandle(*(sem))
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#else
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#include <semaphore.h>
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#endif
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class Fifo {
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public:
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Fifo(int singleBufferSize, int totalBufferSize, sem_t* readerSem);
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~Fifo();
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int numBytesFilled() const;
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bool isEmpty() const;
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bool isFull() const;
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bool willFill(int additional) const;
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char* start() const;
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char* write(int length);
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void release();
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char* read(int *const length);
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private:
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int mSingleBufferSize, mWrite, mRead, mReadCommit, mRaggedEnd, mWrapThreshold;
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sem_t mWaitForSpaceSem;
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sem_t* mReaderSem;
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char* mBuffer;
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bool mEnd;
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// Intentionally unimplemented
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Fifo(const Fifo &);
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Fifo &operator=(const Fifo &);
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};
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#endif //__FIFO_H__
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