DragonFly BSD
DragonFly kernel List (threaded) for 2004-05
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rand() function performs poorly


From: "William M. Grim" <wgrim@xxxxxxxx>
Date: Wed, 12 May 2004 01:37:37 -0500

Hello!

It came to my attention during a test of the rand() function on DragonFly that the rand() function performs poorly.

Take this code for example:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>


int main(void) { int cs, i,r; /*cs == case*/ srand(time(0)); while(1) { cs = rand() % 2; if(cs) printf("O"); else printf("o"); fflush(stdout); } return EXIT_SUCCESS; }


When you run that code, it will print "OoOoOoOo..." without any change; it's very predictable.


I'm certainly up for bringing the later 4.x rand() code down into DragonFly. Where do you think they keep it?

And don't one of you other peeps go and do it for me. :-D I want to try this one on my own! >:-)

Thanks,
Mike




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