63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
/*
|
|
* Copyright (C) 1999-2015 Paolo Mantegazza <mantegazza@aero.polimi.it>
|
|
* Copyright (C) 2019 Alec Ari <neotheuser@ymail.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of the
|
|
* License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
#ifndef _RTAI_RTAI_H
|
|
#define _RTAI_RTAI_H
|
|
|
|
#ifdef __KERNEL__
|
|
#include <linux/version.h>
|
|
#endif /* __KERNEL__ */
|
|
|
|
#include <asm/rtai.h>
|
|
|
|
#ifdef __KERNEL__
|
|
// see: Computing Practices, ACM, vol. 31, n. 10, 1988, pgs 1192-1201.
|
|
|
|
#define TWOPWR31M1 2147483647 // 2^31 - 1
|
|
|
|
static inline long next_rand(long rand)
|
|
{
|
|
const long a = 16807;
|
|
const long m = TWOPWR31M1;
|
|
const long q = 127773;
|
|
const long r = 2836;
|
|
|
|
long lo, hi;
|
|
|
|
hi = rand/q;
|
|
lo = rand - hi*q;
|
|
rand = a*lo - r*hi;
|
|
if (rand <= 0) {
|
|
rand += m;
|
|
}
|
|
return rand;
|
|
}
|
|
|
|
static inline long irandu(unsigned long range)
|
|
{
|
|
static long seed = 783637;
|
|
const long m = TWOPWR31M1;
|
|
|
|
seed = next_rand(seed);
|
|
return rtai_imuldiv(seed, range, m);
|
|
}
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* !_RTAI_RTAI_H */
|