/*
 * 'devices.h' created: Tue Oct 15 23:18:24 2002
 *
 * Copyright 2002 by Lubomir Host <8host AT pauli.fmph.uniba.sk>
 *
 * License: GNU GPL (GNU Public License)
 *
 */

/* $Platon$ */

#ifndef DEVICES_H
#  define DEVICES_H

#include "main.h"

/* operations defined on R.N.G. generators/devices */
typedef struct rng_struct {
	char *desc;				/* description of R.N.G. device */
	int fd;					/* filedescriptor, if R.N.G. is valid device (e.g. /dev/urandom) */
	unsigned int seed;		/* startup initialization seed for kongruential R.N.G. */
	int max_count;			/* maximum available data in R.N.G. for each test */
	Real_t range;			/* range returned by R.N.G. */
	int cell_count;			/* number of numbers per one cell is 2^cell_count */
	int     (*open) (void);	/* open and initialize R.N.G. */
	Real_t  (*read) (void);	/* read one number from R.N.G. */
	int    (*close) (void);	/* close  R.N.G. */
} RNG_device_t;

extern RNG_device_t *rng_devices[]; /* NULL terminated array of device structures */

int  open_devices(void);		/* open  all avilable devices */
int close_devices(void);		/* close all avilable devices */

#endif /* ifndef DEVICES_H */