Date: Sun, 25 Feb 2001 12:59:01 -0600 From: "Jacques A. Vidrine" <n@nectar.com> To: "Andrey A. Chernov" <ache@nagual.pp.ru> Cc: Mark Murray <mark@grondar.za>, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: rand.c patch for review (was: Re: cvs commit: ports/astro/xglobe/files patch-random) Message-ID: <20010225125901.A47165@hamlet.nectar.com> In-Reply-To: <20010225213744.A57744@nagual.pp.ru>; from ache@nagual.pp.ru on Sun, Feb 25, 2001 at 09:37:44PM %2B0300 References: <20010225193409.A56351@nagual.pp.ru> <200102251758.f1PHwuR02481@gratis.grondar.za> <20010225213744.A57744@nagual.pp.ru>
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On Sun, Feb 25, 2001 at 09:37:44PM +0300, Andrey A. Chernov wrote:
> On Sun, Feb 25, 2001 at 19:59:41 +0200, Mark Murray wrote:
> > > Patch for review:
> >
> > Whats wrong with
> >
> > int
> > rand(void)
> > {
> > return((int)random());
> > }
> >
> > ??
>
> 1) Seed & State. Even if srand() is backed by srandom(), if called
> independently, they overwrite each other seeding
> state. initstate() etc. adds more here.
Emphasis: Standard C says that rand/srand must behave as if
no other library functions ever call them. i.e. the state must
not change except when the application calls rand/srand.
Cheers,
--
Jacques Vidrine / n@nectar.com / jvidrine@verio.net / nectar@FreeBSD.org
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