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Date: Tue, 22 May 2012 13:28:28 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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Subject: Re: "emacs -nw" hangs in a terminal
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On May 21 14:51, Ken Brown wrote:
> On 5/21/2012 12:29 PM, Corinna Vinschen wrote:
> >On May 21 11:31, Ken Brown wrote:
> >>On 5/21/2012 6:02 AM, Ken Brown wrote:
> >>>On 5/21/2012 4:50 AM, Filipp Gunbin wrote:
> >>>>emacs-24.0.96-2 crashes when I am doing the following:
> >>>>
> >>>>1) emacs -Q -nw
> >>>>2) M-x shell
> >>>>3) C-x C-f C-g
> >>>
> >>>I can reproduce this. I'll try again to fix it.
> >>
> >>I've discovered something strange by running emacs under gdb.  If I
> >>start emacs-24 in a terminal (but not under X) and start a shell as
> >>you did, then every press of C-g creates a new thread, and these are
> >>never destroyed.  I'm pretty sure the threads are created by Cygwin,
> >>not by emacs.
> >
> >What does C-g mean in Emacs?  What's it supposed to do?  Does it
> >call select or poll?
> 
> It's supposed to quit whatever operation is in progress.  It doesn't
> call select or poll.  In the situation of Filipp's instructions
> above, C-x C-f has caused emacs to prompt for a file name, and C-g
> should interrupt that.  It also rings the the terminal bell and
> prints "Quit" in the echo area at the bottom of the screen.
> 
> The situation in my instructions is slightly different.  Prior to
> the user pressing C-g, emacs is running its idle loop, in which it
> repeatedly calls select to see if there's any event it needs to
> respond  to.  When C-g is pressed, select returns and emacs reacts
> to the keypress.  In this case there's nothing to do but ring the
> terminal bell and print "Quit".

Somehow I'm not able to test this.  When I start `emacs -Q -nw' in cmd
or mintty, emacs takes 100% CPU for some reason.  It doesn't matter if I
try it under Cygwin 1.7.15 or current CVS.


Corinna

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

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