X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:message-id:from:reply-to:to:subject
	:references:in-reply-to:content-type; q=dns; s=default; b=Xr4tzt
	oSM+0EbUu5v++dhJi4RK0BwAVN20Imw36Rz/mVMX9JdMeSnpZRcYfD0sH8xjlEGt
	Dz9dsq8mldJU+UjuvRHCQC7THePlmlazJNM+11/H02Z5snldaaoY15658xAd+sEg
	IdKNKF9fF2jxaxQPItOtlW+5VZg/6IkO/hz5k=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:message-id:from:reply-to:to:subject
	:references:in-reply-to:content-type; s=default; bh=huvBrCAV93H2
	/enbhIPyV1rTkmM=; b=s/s4+SbFD1HMquNgOSFOybKLdIe8T2Zh8qDFRJPXtYMz
	XqzrGlCH8sOoIvlVriaRMJpZfYiefA1UXysL3phkprLFzAmht6ICvLNA+3RkBKwL
	Hh0TcvEARfN0IM4cLsdvaSd0b3BQ52z4Dd8y/GqOVkXL5mgtMKzLwbyg+Jp8I0A=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Authentication-Results:	sourceware.org; auth=none
X-Spam-SWARE-Status:	No, score=-2.6 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_LOW,SPF_PASS autolearn=ham version=3.3.2 spammy=H*M:smtp, Hx-languages-length:795, H*F:D*nl
X-HELO:	lb1-smtp-cloud7.xs4all.net
Date:	Mon, 26 Nov 2018 18:38:25 +0100
Message-ID:	<b72ca69dad443e4690672648f808949e@smtp-cloud7.xs4all.net>
From:	Houder <houder AT xs4all DOT nl>
Reply-To:	cygwin AT cygwin DOT com
To:	cygwin AT cygwin DOT com
Subject:	Re: No thread safety in clock_gettime (hires_ns::prime)
References:	<CAOWZHxdJi1E9APtSXm35LkDU33VqGZSwnGtvOfdHA9PTTJgRjQ AT mail DOT gmail DOT com> <20181126170140 DOT GO30649 AT calimero DOT vinschen DOT de>
In-Reply-to:	<20181126170140.GO30649@calimero.vinschen.de>
User-Agent:	mua.awk 0.99

On Mon, 26 Nov 2018 18:01:40, Corinna Vinschen  wrote:
> 
> On Nov 23 11:27, James E. King III wrote:
[snip]

> > I found that a call to
> > clock_gettime(CLOCK_MONOTONIC, ..) has a one-time initialization that
> > is not thread-safe.  If two threads call this at the same time, they
> > will race.  The results I am seeing are typically that one of the two
> > callers get a timespec structure with zero values, and no error return
> > code from the call.
> 
> Thanks for the testcase, but I can't reproduce the problem, neither on
> 32 bit nor on 64 bit.  I tweaked your makefile to have a 100K loop I
> started multiple times with differently optimzed code, but to no avail.

I can, easily. (Windows 7, 64-bits. Unmodified Makefile.)

Henri


--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

- Raw text -