1 files changed, 41 insertions, 0 deletions
diff --git a/daemon/Fifo.h b/daemon/Fifo.h
new file mode 100644
index 0000000..02372d5
--- /dev/null
+++ b/daemon/Fifo.h
@@ -0,0 +1,41 @@
+/**
+ * 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__