/usr/include/simgear/math/sg_random.h is in libsimgear-dev 3.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 | /**
* \file sg_random.h
* Routines to handle random number generation and hide platform differences.
*/
// Written by Curtis Olson, started July 1997.
//
// Copyright (C) 1997 Curtis L. Olson - http://www.flightgear.org/~curt
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// $Id$
#ifndef _SG_RANDOM_H
#define _SG_RANDOM_H
#ifdef __cplusplus
extern "C" {
#endif
#define MT_N 624
#define MT_M 397
/**
* Structure to hold MT algorithm state to easily allow independant
* sets of random numbers with different seeds.
*/
typedef struct {unsigned int array[MT_N]; int index; } mt;
/**
* Initialize a new MT state with a given seed.
*/
void mt_init(mt *mt, unsigned int seed);
/**
* Initialize a new MT state with a seed that only
* changes every 10 minutes. Used to synchronize
* multi-process deployments.
*/
void mt_init_time_10(mt *mt);
/**
* Generate a new 32-bit random number based on the given MT state.
*/
unsigned int mt_rand32( mt *mt);
/**
* Generate a new random number between [0.0, 1.0) based
* on the given MT state.
*/
double mt_rand(mt *mt);
/**
* Seed the random number generater with time() so we don't see the
* same sequence every time.
*/
void sg_srandom_time();
/**
* Seed the random number generater with time() in 10 minute intervals
* so we get the same sequence within 10 minutes interval.
* This is useful for synchronizing two display systems.
*/
void sg_srandom_time_10();
/**
* Seed the random number generater with your own seed so can set up
* repeatable randomization.
* @param seed random number generator seed
*/
void sg_srandom(unsigned int seed );
/**
* Return a random number between [0.0, 1.0)
* @return next "random" number in the "random" sequence
*/
double sg_random();
#ifdef __cplusplus
}
#endif
#endif // _SG_RANDOM_H
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