/**
 * my implementation of a ringbuffer.
 * It maps a shared memory object twice directly following
 * thus make it possible to read and write from any
 * position within the buffer without the nasty wrap
 * calculations.
 * This is achived because the same memory region is mapped
 * at the two addresses.
 */
#ifndef __RINGBUFFER_H__
#define __RINGBUFFER_H__

#include <sys/types.h>

#include "class.h"

#define ERBOVRFL		100


CLASS(Ringbuffer) {
	char * shm_name;  // shared memory identifier

	char * buffer;
	char * mirror;

	size_t bsize;
	size_t bused;
	size_t bstart;
	size_t bend;
};

ssize_t rbRead(Ringbuffer, int fd);
ssize_t rbWrite(Ringbuffer, int fd);

#endif // __RINGBUFFER_H__

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