X-Spam-Check-By:	sourceware.org
Message-ID:	<4403339C.9000807@steeleye.com>
Date:	Mon, 27 Feb 2006 12:15:08 -0500
From:	Paul Clements <paul DOT clements AT steeleye DOT com>
User-Agent:	Mozilla Thunderbird 1.0.2 (X11/20050317)
MIME-Version:	1.0
To:	cygwin AT cygwin DOT com
Subject:	Re: Shells hang during script execution
References:	<43FF6AED DOT 1060102 AT steeleye DOT com> <20060224213808 DOT GA7638 AT trixie DOT casa DOT cgf DOT cx>
In-Reply-To:	<20060224213808.GA7638@trixie.casa.cgf.cx>
X-IsSubscribed:	yes
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
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

Christopher Faylor wrote:
> On Fri, Feb 24, 2006 at 03:22:05PM -0500, Paul Clements wrote:

>>OK, I think I see what is happening now:

>>set_signal_mask() does indeed call sig_dispatch_pending() to do a flush
>>when the signal mask changes.  However, when the sigq is empty,
>>sig_dispatch_pending() just returns! See:

>>sig_dispatch_pending (bool fast) { -if (exit_state || &_my_tls ==
>>_sig_tls || !sigq.start.next) +if (exit_state || &_my_tls == _sig_tls)


> I always wondered if that "optimization" was right and now I see that it is
> obviously racy.  I've removed it from the source.

OK, great. Thanks.

> Not until I ran the test suite, waited five minutes and saw an error.
> Attaching gdb to the running process shows another problem.  I'll check
> in a fix for this, too.

Where can I find this patch? Could you post it or is there somewhere I 
should go to find it? I have a feeling I've probably run into this 
myself during my stress tests.

--
Paul

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

- Raw text -