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Date:	Wed, 23 May 2012 19:54:03 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: 1.7.15-1: pthread_cancel and pthread_kill not working as expected
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On May 23 10:42, David Rothenberger wrote:
> On 5/23/2012 10:18 AM, Corinna Vinschen wrote:
> > On May 23 18:06, Corinna Vinschen wrote:
> >> On May 23 10:52, Corinna Vinschen wrote:
> >>> On May 22 15:25, Otto Meta wrote:
> >>>>>> Testcase cancel deferred:
> >>>>>> Works with 1.7.9 and 20120517 snapshot, fails (hangs) with 1.7.12-1
> >>>>>> and 1.7.15-1.
> >>>>> If that works in the snapshot anyway, I'm not going to look into that
> >>>>> one.
> >>>>
> >>>> It worked in the reduced testcase with sem_wait(). With read() it’s
> >>>> still half-broken. See below.
> >>>>
> >>>>>> Testcase cancel asynchronous:
> >>>>>> Async cancel seems to have no effect with any tested version.
> >>>>> I think I found a solution for this problem.  See the comment in the
> >>>>> patch at
> >>>>> http://sourceware.org/cgi-bin/cvsweb.cgi/src/winsup/cygwin/thread.cc.diff?cvsroot=src&r1=1.258&r2=1.259
> >>>>> Please test the today's developer snapshot.
> >>>>
> >>>> Asynchronous cancel seems to work as well as deferred cancel now. Thanks.
> >>>>
> >>>> Both cancel types work with sem_wait() and pause() now, but for threads
> >>>> blocked in read() they’re still unreliable. Only one of three blocked
> >>>> threads is killed in the attached updated testcases.
> >>>
> >>> Just to let you know I'm working on it.  This will take some time.
> >>> During debugging I stumbled over a heisenbug.  As soon as I remove the
> >>> "Thread %i woke up just fine" printf from your test application, the
> >>> read function reurns with a "Bad address" error.  So far I have onlya
> >>> vague hunch what the cause may be.  Stay tuned.
> >>
> >> Half of the solution is now checked in to CVS.  The other half is a bad
> >> hack to workaround a shortcoming in newlib's stdio functions.  I'd rather
> >> have a solution in newlib.  see my request on the newlib ML:
> >> http://cygwin.com/ml/newlib/2012/msg00188.html
> > 
> > Ok, for the time being I checked in my workaround.  Please test the
> > today's developer snapshot.
> 
> I tried installing this snapshot and found most things hung.
> Specifically, I ran ash in a Windows cmd window, then tried
> 
>   /bin/echo foo
> 
> I tried mintty too but bash hangs before I get a prompt.

Big fat sigh.  This all worked fine while debugging.  Just that the
snapshot is built with optimization and my debugging version is not.
Ok, back to the drawing board.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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