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Date: Fri, 25 May 2012 14:49:43 -0400
From: Ken Brown <kbrown AT cornell DOT edu>
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Subject: Re: "emacs -nw" hangs in a terminal
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On 5/25/2012 10:35 AM, Corinna Vinschen wrote:
> On May 25 15:03, Corinna Vinschen wrote:
>> On May 25 08:45, Ken Brown wrote:
>>> On 5/25/2012 6:03 AM, Corinna Vinschen wrote:
>>>> And then again, do we know if 24.x works on older Cygwin release or
>>>> snapshots?  If it's a Cygwin problem, it might help to nail it down.
>>>
>>> It works on the 20120111 snapshot but fails on the 20120122
>>> snapshot. Thanks for suggesting this.  It should have been the first
>>> thing I checked.
>>
>> Cool!  That only leaves three checkins to be the culprit.  I'm not
>> sure I can get to it over the weekend (and Monday is a holiday here),
>> but I'll certainly try to track it down next week.
>
> Ok, I had a look already and I see where the problem is, but that
> doesn't mean I understand it yet.
>
> C-g results in calling an emacs signal handler from select.  Up to the
> change from 20120122 in select.cc, all select threads have been stopped
> before the signal handler is called.  This works fine.
>
> After the change from 20120122, the signal handler is called first, and
> only afterwards the select threads are cleaned up.  This results in
> starting another pipesel thread and the subsequent crash.
>
> I applied a patch which calls the signal handler after cleanup.  The
> downside is that the signal handler is only called if select is called
> from the main thread.  A better patch would perhaps be to stop all
> threads, call the signal handler, and restart the threads afterwards,
> but this is more tricky.

Thanks!  That fixes it.  I appreciate all your work on this.

I'm in the process now of testing to see if this also fixes an emacs 
crash I've been getting when I build emacs with GSettings support 
(http://cygwin.com/ml/cygwin-xfree/2012-04/msg00048.html).

Ken


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