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

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Package: emacs; Reported by: Katsumi Yamaoka <yamaoka@HIDDEN>; dated Tue, 4 Jun 2013 07:07:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Stefan Kangas <stefan@HIDDEN>
Date: Tue, 1 Oct 2019 02:59:51 +0200
Message-ID: <CADwFkmk7t8ahz-Q8-0vSGjLxh_53CC5b44xnMq+ML7S8HZ4bnQ@HIDDEN>
Subject: Re: bug#14553: 24.3.50; C-g doesn't break inf-loop
To: Katsumi Yamaoka <yamaoka@HIDDEN>
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Katsumi Yamaoka <yamaoka@HIDDEN> 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




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#14553; Package emacs. Full text available.

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From: Katsumi Yamaoka <yamaoka@HIDDEN>
To: Stefan Kangas <stefan@HIDDEN>
Subject: Re: bug#14553: 24.3.50; C-g doesn't break inf-loop
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On Mon, 30 Sep 2019 17:44:01 +0200, Stefan Kangas wrote:
> Katsumi Yamaoka <yamaoka@HIDDEN> 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.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#14553; Package emacs. Full text available.

Message received at 14553 <at> debbugs.gnu.org:


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Subject: Re: bug#14553: 24.3.50; C-g doesn't break inf-loop
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Katsumi Yamaoka <yamaoka@HIDDEN> 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




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#14553; Package emacs. Full text available.
Changed bug title to '[cygwin] C-g doesn't interrupt (while t)' from '24.3.50; C-g doesn't break inf-loop' Request was from npostavs@HIDDEN to control <at> debbugs.gnu.org. Full text available.
Severity set to 'normal' from 'important' Request was from Stefan Monnier <monnier@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 14553 <at> debbugs.gnu.org:


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


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Subject: Re: bug#14553: 24.3.50; C-g doesn't break inf-loop
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On 7/2/2013 7:17 PM, Josh wrote:
> On Tue, Jul 2, 2013 at 1:12 PM, Ken Brown <kbrown@HIDDEN> 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




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From: Katsumi Yamaoka <yamaoka@HIDDEN>
To: Josh <josh@HIDDEN>
Subject: Re: bug#14553: 24.3.50; C-g doesn't break inf-loop
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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.




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On Tue, Jul 2, 2013 at 1:12 PM, Ken Brown <kbrown@HIDDEN> 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.




Information forwarded to bug-gnu-emacs@HIDDEN:
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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





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bug#14553; Package emacs. Full text available.

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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@HIDDEN
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'




Acknowledgement sent to Katsumi Yamaoka <yamaoka@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#14553; Package emacs. Full text available.
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