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// Copyright 2006 David Hilvert <dhilvert@auricle.dyndns.org>,
// <dhilvert@ugcs.caltech.edu>
// <dhilvert@gmail.com>
/* This file is part of the Anti-Lamenessing Engine.
The Anti-Lamenessing Engine 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 3 of the License, or
(at your option) any later version.
The Anti-Lamenessing Engine 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 the Anti-Lamenessing Engine; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* rand.h: random number generator class.
*/
#ifndef __rand_h__
#define __rand_h__
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#ifdef USE_PTHREAD
#include <pthread.h>
#endif
class rng_t {
#ifdef USE_PTHREAD
static pthread_mutex_t rand_mutex;
#endif
union {
unsigned int state_ui;
unsigned short state_us3[3];
} state_vars;
public:
void seed(unsigned int s) {
#ifdef USE_PTHREAD
state_vars.state_us3[0] = (unsigned short) s;
state_vars.state_us3[1] = 0;
state_vars.state_us3[2] = 0;
state_vars.state_ui = s;
#else
srand(s);
#endif
}
int get() {
#ifdef USE_PTHREAD
#if HAVE_NRAND48
return (int) nrand48(state_vars.state_us3) % RAND_MAX;
#elif HAVE_RAND_R
return rand_r(&state_vars.state_ui);
#else
int result;
pthread_mutex_lock(&rand_mutex);
srand(state_vars.state_ui);
result = rand();
pthread_mutex_unlock(&rand_mutex);
state_vars.state_ui = (unsigned int) result;
return result;
#endif
#else
return rand();
#endif
}
};
#endif
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