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bug#14553: 24.3.50; C-g doesn't break inf-loop


From: Ken Brown
Subject: bug#14553: 24.3.50; C-g doesn't break inf-loop
Date: Wed, 03 Jul 2013 07:13:49 -0400
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130509 Thunderbird/17.0.6

On 7/2/2013 7:17 PM, Josh wrote:
On Tue, Jul 2, 2013 at 1:12 PM, Ken Brown <address@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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