Ray: /ray/src/lib/numerics/rng/libc.cc Source File

00001 /*
00002  * lib/numerics/rng/libc.cc
00003  * 
00004  * Interface implementation for LIBC random() PRNG. 
00005  * 
00006  * Copyright (c) 2004 by Wolfgang Wieser ] wwieser (a) gmx <*> de [ 
00007  * 
00008  * This file may be distributed and/or modified under the terms of the 
00009  * GNU General Public License version 2 as published by the Free Software 
00010  * Foundation. (See COPYING.GPL for details.)
00011  * 
00012  * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
00013  * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
00014  * 
00015  */
00016 
00017 #include "libc.h"
00018 
00019 namespace NUM  // numerics
00020 {
00021 
00022 void RandomNumberGenerator_LibCRandom::seed(uint seed,int statelen)
00023 {
00024     statebuf=REALLOC(statebuf,statelen);
00025     initstate_r(seed,statebuf,statelen,&rdata);
00026     setstate_r(statebuf,&rdata);
00027 }
00028 
00029 
00030 static char _StartupCheck()
00031 {
00032     // Make sure random_r returns random number in "full 31 bit spectrum". 
00033     CritAssert(RAND_MAX==0x7fffffff);  // critical (startup check)
00034 }
00035 
00036 static char _startup_check=_StartupCheck();
00037 
00038 }  // end of namespace NUM