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Date: Tue, 22 May 2012 07:42:30 -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 5/22/2012 7:28 AM, Corinna Vinschen wrote:
> 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.

That's strange.  All my tests were done in mintty.  Would it help if I 
sent some strace output and/or a gdb backtrace?  I assumed you could get 
those (or at least the strace output) yourself, and I didn't want to 
spam the list.

Ken

P.S. BTW, I tested today's snapshot, and the problem is still there.


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