diff options
Diffstat (limited to 'drivers/gator/daemon/Fifo.h')
-rw-r--r-- | drivers/gator/daemon/Fifo.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/gator/daemon/Fifo.h b/drivers/gator/daemon/Fifo.h new file mode 100644 index 00000000000..51e2bcd6a7f --- /dev/null +++ b/drivers/gator/daemon/Fifo.h @@ -0,0 +1,41 @@ +/** + * Copyright (C) ARM Limited 2010-2012. 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> + +// Number of buffers allowed with large buffer mode +#define FIFO_BUFFER_LIMIT 64 + +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__ |