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To: cygwin AT cygwin DOT com, Norton Allen <allen AT huarp DOT harvard DOT edu>
Subject: Re: rand is not ISO C compliant in Cygwin
Date: Fri, 10 Nov 2023 23:27:49 +0100
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From: Bruno Haible via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Bruno Haible <bruno AT clisp DOT org>
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Norton Allen wrote:
> Cygwin/(newlib?) has chosen to avoid race conditions by making 
> pseudo-random sequences in different threads independent. Although the 
> standard does not require this, it does not prohibit it either.

I disagree. I cited the relevant sentences from the standard.

Other platforms (glibc, Android) avoid race conditions in rand()
by locking. Which is compliant with the standard.

Bruno




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