GNU bug report logs - #14553
[cygwin] C-g doesn't interrupt (while t)

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Katsumi Yamaoka <yamaoka <at> jpl.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; C-g doesn't break inf-loop
Date: Tue, 04 Jun 2013 15:10:48 +0900

Hi,

Start Emacs with the -Q option.
Eval the form: (while t)

Then I get unable to break it.  So is Emacs 24.3.  This may happen
only on Cygwin, though.  It makes me hard to debug a code suspected
to have an infinite loop.

In GNU Emacs 24.3.50.1 (i686-pc-cygwin, X toolkit, Xaw3d scroll bars)
 of 2013-06-04 on localhost
Bzr revision: 112842 michael.albinus <at> gmx.de-20130603193806-1f2pilg1t709mqyg
Windowing system distributor `The Cygwin/X Project', version 11.0.11401000
Configured using:
 `configure --verbose --with-x-toolkit=lucid --without-imagemagick
 --without-dbus --without-gconf --without-gsettings'

Message #8 received at 14553 <at> debbugs.gnu.org (full text, mbox):

From: Ken Brown <kbrown <at> cornell.edu>
To: Katsumi Yamaoka <yamaoka <at> jpl.org>
Cc: 14553 <at> debbugs.gnu.org
Subject: Re: bug#14553: 24.3.50; C-g doesn't break inf-loop
Date: Tue, 02 Jul 2013 16:12:41 -0400

On 6/4/2013 2:10 AM, Katsumi Yamaoka wrote:
> Hi,
>
> Start Emacs with the -Q option.
> Eval the form: (while t)
>
> Then I get unable to break it.  So is Emacs 24.3.  This may happen
> only on Cygwin, though.  It makes me hard to debug a code suspected
> to have an infinite loop.

I can confirm that this happens on Cygwin but not on GNU/Linux.  This 
may just reflect the fact that Cygwin doesn't have SIGIO.  Maybe someone 
who understands how Emacs handles keyboard input can weigh in on this 
and suggest a workaround.

Ken

Message #11 received at 14553 <at> debbugs.gnu.org (full text, mbox):

From: Josh <josh <at> foxtail.org>
To: Ken Brown <kbrown <at> cornell.edu>
Cc: Katsumi Yamaoka <yamaoka <at> jpl.org>, 14553 <at> debbugs.gnu.org
Subject: Re: bug#14553: 24.3.50; C-g doesn't break inf-loop
Date: Tue, 2 Jul 2013 16:17:01 -0700

On Tue, Jul 2, 2013 at 1:12 PM, Ken Brown <kbrown <at> cornell.edu> wrote:
> On 6/4/2013 2:10 AM, Katsumi Yamaoka wrote:
>>
>> Hi,
>>
>> Start Emacs with the -Q option.
>> Eval the form: (while t)
>>
>> Then I get unable to break it.  So is Emacs 24.3.  This may happen
>> only on Cygwin, though.  It makes me hard to debug a code suspected
>> to have an infinite loop.

> I can confirm that this happens on Cygwin but not on GNU/Linux.  This may
> just reflect the fact that Cygwin doesn't have SIGIO.  Maybe someone who
> understands how Emacs handles keyboard input can weigh in on this and
> suggest a workaround.

FWIW, I am able to successfully interrupt that loop via C-g on my
Cygwin system, which was configured with the --with-w32 flag and built
from yesterday's trunk.

Message #14 received at 14553 <at> debbugs.gnu.org (full text, mbox):

From: Katsumi Yamaoka <yamaoka <at> jpl.org>
To: Josh <josh <at> foxtail.org>
Cc: 14553 <at> debbugs.gnu.org, Ken Brown <kbrown <at> cornell.edu>
Subject: Re: bug#14553: 24.3.50; C-g doesn't break inf-loop
Date: Wed, 03 Jul 2013 09:34:52 +0900

Josh wrote:
>> On 6/4/2013 2:10 AM, Katsumi Yamaoka wrote:
>>> Start Emacs with the -Q option.
>>> Eval the form: (while t)
>>>
>>> Then I get unable to break it.

[...]

> FWIW, I am able to successfully interrupt that loop via C-g on my
> Cygwin system, which was configured with the --with-w32 flag and built
> from yesterday's trunk.

Oh, it works!  Thanks.  So, Emacs links some essential one only
when --with-w32, doesn't it?  I don't know what it is, but I hope
Cygwin Emacs uses it no matter what GUI is chosen.  My configure
options are:

--verbose --with-x-toolkit=lucid --without-imagemagick --without-dbus
--without-gconf --without-gsettings'

;; I tried --with-w32, and found it uses funny key bindings (by
;; default?) --- there's no C-h key, M-x isn't M-x, etc.  For not
;; only it but also the font settings and so forth, it seems to
;; take time to make it usable as before.

Message #17 received at 14553 <at> debbugs.gnu.org (full text, mbox):

From: Ken Brown <kbrown <at> cornell.edu>
To: Josh <josh <at> foxtail.org>
Cc: Katsumi Yamaoka <yamaoka <at> jpl.org>, 14553 <at> debbugs.gnu.org
Subject: Re: bug#14553: 24.3.50; C-g doesn't break inf-loop
Date: Wed, 03 Jul 2013 07:13:49 -0400

On 7/2/2013 7:17 PM, Josh wrote:
> On Tue, Jul 2, 2013 at 1:12 PM, Ken Brown <kbrown <at> cornell.edu> wrote:
>> On 6/4/2013 2:10 AM, Katsumi Yamaoka wrote:
>>>
>>> Hi,
>>>
>>> Start Emacs with the -Q option.
>>> Eval the form: (while t)
>>>
>>> Then I get unable to break it.  So is Emacs 24.3.  This may happen
>>> only on Cygwin, though.  It makes me hard to debug a code suspected
>>> to have an infinite loop.
>
>> I can confirm that this happens on Cygwin but not on GNU/Linux.  This may
>> just reflect the fact that Cygwin doesn't have SIGIO.  Maybe someone who
>> understands how Emacs handles keyboard input can weigh in on this and
>> suggest a workaround.
>
> FWIW, I am able to successfully interrupt that loop via C-g on my
> Cygwin system, which was configured with the --with-w32 flag and built
> from yesterday's trunk.

And this also works with the X11 build if Emacs is run in the Cygwin 
terminal (mintty).  So it appears that the problem only occurs when 
Emacs is running under X11.  I don't know anything about how keyboard 
input works under X11, so I'm not sure where to go from here.

Ken

Message #20 received at 14553 <at> debbugs.gnu.org (full text, mbox):

From: Daniel Colascione <dancol <at> dancol.org>
To: 14553 <at> debbugs.gnu.org
Subject: 24.3.50; C-g doesn't break inf-loop
Date: Sat, 22 Mar 2014 23:27:36 -0700

[Message part 1 (text/plain, inline)]

Sounds like a problem with signal delivery. Have you reported it to the
cygwin mailing list?

[signature.asc (application/pgp-signature, attachment)]

Message #27 received at 14553 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Katsumi Yamaoka <yamaoka <at> jpl.org>
Cc: 14553 <at> debbugs.gnu.org
Subject: Re: bug#14553: 24.3.50; C-g doesn't break inf-loop
Date: Mon, 30 Sep 2019 17:44:01 +0200

Katsumi Yamaoka <yamaoka <at> jpl.org> writes:

> Hi,
>
> Start Emacs with the -Q option.
> Eval the form: (while t)
>
> Then I get unable to break it.  So is Emacs 24.3.  This may happen
> only on Cygwin, though.  It makes me hard to debug a code suspected
> to have an infinite loop.

That was six years ago.  Are you still seeing this on a modern version
of Emacs?

Best regards,
Stefan Kangas

Message #30 received at 14553 <at> debbugs.gnu.org (full text, mbox):

From: Katsumi Yamaoka <yamaoka <at> jpl.org>
To: Stefan Kangas <stefan <at> marxist.se>
Cc: 14553 <at> debbugs.gnu.org
Subject: Re: bug#14553: 24.3.50; C-g doesn't break inf-loop
Date: Tue, 01 Oct 2019 09:01:37 +0900

On Mon, 30 Sep 2019 17:44:01 +0200, Stefan Kangas wrote:
> Katsumi Yamaoka <yamaoka <at> jpl.org> writes:
>> Start Emacs with the -Q option.
>> Eval the form: (while t)

>> Then I get unable to break it.  So is Emacs 24.3.  This may happen
>> only on Cygwin, though.  It makes me hard to debug a code suspected
>> to have an infinite loop.

> That was six years ago.  Are you still seeing this on a modern version
> of Emacs?

C-g still doesn't break (while t) on Emacs 27.0.50 of today, and
also on 26.3.50, 26.1, 25.1 rebuilt recently.  I got used to it,
so I'm not so troubled. ;-)  Thanks for following this up.

Message #33 received at 14553 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Katsumi Yamaoka <yamaoka <at> jpl.org>
Cc: 14553 <at> debbugs.gnu.org
Subject: Re: bug#14553: 24.3.50; C-g doesn't break inf-loop
Date: Tue, 1 Oct 2019 02:59:51 +0200

Katsumi Yamaoka <yamaoka <at> jpl.org> writes:

> > That was six years ago.  Are you still seeing this on a modern version
> > of Emacs?
>
> C-g still doesn't break (while t) on Emacs 27.0.50 of today, and
> also on 26.3.50, 26.1, 25.1 rebuilt recently.  I got used to it,
> so I'm not so troubled. ;-)  Thanks for following this up.

Thanks for reporting back.

Daniel Colascione suggested that there might be a problem with signal
delivery on Cygwin, and to report it to their mailing list:
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=14553#20

Perhaps that might be worth doing if you haven't already.

Best regards,
Stefan Kangas

Message #36 received at 14553 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Katsumi Yamaoka <yamaoka <at> jpl.org>
Cc: 14553 <at> debbugs.gnu.org, Daniel Colascione <dancol <at> dancol.org>
Subject: Re: bug#14553: [cygwin] C-g doesn't interrupt (while t)
Date: Wed, 10 Jan 2024 03:14:11 -0800

Daniel Colascione <dancol <at> dancol.org> writes:

> Sounds like a problem with signal delivery. Have you reported it to the
> cygwin mailing list?

Stefan Kangas <stefankangas <at> gmail.com> writes:

> Katsumi Yamaoka <yamaoka <at> jpl.org> writes:
>
>> > That was six years ago.  Are you still seeing this on a modern version
>> > of Emacs?
>>
>> C-g still doesn't break (while t) on Emacs 27.0.50 of today, and
>> also on 26.3.50, 26.1, 25.1 rebuilt recently.  I got used to it,
>> so I'm not so troubled. ;-)  Thanks for following this up.
>
> Thanks for reporting back.
>
> Daniel Colascione suggested that there might be a problem with signal
> delivery on Cygwin, and to report it to their mailing list:
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=14553#20
>
> Perhaps that might be worth doing if you haven't already.

Coming back to this four years later, it sounds like this might be a bug
in Cygwin.  Is that correct?

If yes, should we really keep this bug open on our end?

Message #41 received at 14553-done <at> debbugs.gnu.org (full text, mbox):

From: Ken Brown <kbrown <at> cornell.edu>
To: Stefan Kangas <stefankangas <at> gmail.com>, Katsumi Yamaoka <yamaoka <at> jpl.org>
Cc: Daniel Colascione <dancol <at> dancol.org>, 14553-done <at> debbugs.gnu.org
Subject: Re: bug#14553: [cygwin] C-g doesn't interrupt (while t)
Date: Wed, 10 Jan 2024 11:31:38 -0500

On 1/10/2024 6:14 AM, Stefan Kangas wrote:
> Daniel Colascione <dancol <at> dancol.org> writes:
> 
>> Sounds like a problem with signal delivery. Have you reported it to the
>> cygwin mailing list?
> 
> Stefan Kangas <stefankangas <at> gmail.com> writes:
> 
>> Katsumi Yamaoka <yamaoka <at> jpl.org> writes:
>>
>>>> That was six years ago.  Are you still seeing this on a modern version
>>>> of Emacs?
>>>
>>> C-g still doesn't break (while t) on Emacs 27.0.50 of today, and
>>> also on 26.3.50, 26.1, 25.1 rebuilt recently.  I got used to it,
>>> so I'm not so troubled. ;-)  Thanks for following this up.
>>
>> Thanks for reporting back.
>>
>> Daniel Colascione suggested that there might be a problem with signal
>> delivery on Cygwin, and to report it to their mailing list:
>> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=14553#20
>>
>> Perhaps that might be worth doing if you haven't already.
> 
> Coming back to this four years later, it sounds like this might be a bug
> in Cygwin.  Is that correct?

Not sure.

> If yes, should we really keep this bug open on our end?

I think it should be closed, and I'm doing it with this email.

Ken

Message #44 received at 14553-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Ken Brown <kbrown <at> cornell.edu>, Katsumi Yamaoka <yamaoka <at> jpl.org>
Cc: Daniel Colascione <dancol <at> dancol.org>, 14553-done <at> debbugs.gnu.org
Subject: Re: bug#14553: [cygwin] C-g doesn't interrupt (while t)
Date: Wed, 10 Jan 2024 09:09:46 -0800

Ken Brown <kbrown <at> cornell.edu> writes:

> I think it should be closed, and I'm doing it with this email.

Thank you.

Message #47 received at 14553 <at> debbugs.gnu.org (full text, mbox):

From: Katsumi Yamaoka <yamaoka <at> jpl.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 14553 <at> debbugs.gnu.org, Daniel Colascione <dancol <at> dancol.org>,
 Ken Brown <kbrown <at> cornell.edu>
Subject: Re: bug#14553: [cygwin] C-g doesn't interrupt (while t)
Date: Thu, 11 Jan 2024 14:29:42 +0900

On Wed, 10 Jan 2024 09:09:46 -0800, Stefan Kangas wrote:
> Ken Brown <kbrown <at> cornell.edu> writes:
>> I think it should be closed, and I'm doing it with this email.
> Thank you.

Oh, I confirmed that I can break `(while t)' by C-g on Emacs 29.1
and up.  That's great!  Thanks!

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