83 lines
2.0 KiB
C++
83 lines
2.0 KiB
C++
// Copyright 2006 David Hilvert <dhilvert@auricle.dyndns.org>,
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// <dhilvert@ugcs.caltech.edu>
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// <dhilvert@gmail.com>
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/* This file is part of the Anti-Lamenessing Engine.
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The Anti-Lamenessing Engine is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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The Anti-Lamenessing Engine is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the Anti-Lamenessing Engine; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* rand.h: random number generator class.
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*/
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#ifndef __rand_h__
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#define __rand_h__
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#ifdef USE_PTHREAD
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#include <pthread.h>
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#endif
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class rng_t {
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#ifdef USE_PTHREAD
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static pthread_mutex_t rand_mutex;
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#endif
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union {
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unsigned int state_ui;
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unsigned short state_us3[3];
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} state_vars;
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public:
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void seed(unsigned int s) {
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#ifdef USE_PTHREAD
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state_vars.state_us3[0] = (unsigned short) s;
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state_vars.state_us3[1] = 0;
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state_vars.state_us3[2] = 0;
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state_vars.state_ui = s;
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#else
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srand(s);
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#endif
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}
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int get() {
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#ifdef USE_PTHREAD
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#if HAVE_NRAND48
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return (int) nrand48(state_vars.state_us3) % RAND_MAX;
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#elif HAVE_RAND_R
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return rand_r(&state_vars.state_ui);
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#else
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int result;
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pthread_mutex_lock(&rand_mutex);
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srand(state_vars.state_ui);
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result = rand();
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pthread_mutex_unlock(&rand_mutex);
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state_vars.state_ui = (unsigned int) result;
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return result;
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#endif
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#else
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return rand();
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#endif
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}
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};
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#endif
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