From: Chong Yidong <cyd@stupidchicken.com>
Cc: Nick Roberts <nickrob@snap.net.nz>,
Romain Francoise <romain@orebokech.com>,
emacs-devel@gnu.org
Subject: Re: C-g crash redux
Date: Thu, 03 Aug 2006 11:13:39 -0400 [thread overview]
Message-ID: <87fygd97j0.fsf@stupidchicken.com> (raw)
In-Reply-To: <m3u04uwwpf.fsf@kfs-l.imdomain.dk> (Kim F. Storm's message of "Thu, 03 Aug 2006 01:21:16 +0200")
>> Emacs can be made to crash simply by evaluating (sit-for 4) in the scratch
>> buffer and typing C-g before four seconds elapse.
>>
>> It's due to this change:
>>
>> 2006-08-01 Kim F. Storm <storm@cua.dk>
>>
>> * process.c (wait_reading_process_output_unwind): New function.
>> Restores waiting_for_user_input_p to saved value.
>> (wait_reading_process_output): Unwind protect waiting_for_user_input_p
>> instead of save/restore old value on stack.
>>
>> Presumably wait_reading_process_output is interrupted before it can do:
>>
>> unbind_to (count, Qnil);
>
> Huh? Is that really possible?
>
> What kind of interrupt can cause unwind_protect forms NOT to be run?
Typing C-g, which runs interrupt_signal, runs quit_throw_to_read_char
instead of Fsignal during when waiting_for_input is set (as it is
during wait_reading_process_output). If I understand correctly, the
purpose is to enable read-char to return a `C-g' character; and that's
why it's both undesirable and unnecesssary to use a
record_unwind_protect inside wait_reading_process_output.
I'll go ahead and revert the 2006-08-01 change.
next prev parent reply other threads:[~2006-08-03 15:13 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-02 20:50 C-g crash redux Romain Francoise
2006-08-02 22:07 ` Nick Roberts
2006-08-02 23:21 ` Kim F. Storm
2006-08-03 2:40 ` Nick Roberts
2006-08-03 15:13 ` Chong Yidong [this message]
2006-08-03 22:29 ` Kim F. Storm
2006-08-04 0:32 ` Chong Yidong
2006-08-04 1:49 ` Nick Roberts
2006-08-04 11:12 ` Kim F. Storm
2006-08-04 15:26 ` Chong Yidong
2006-08-04 16:03 ` Chong Yidong
2006-08-04 20:59 ` Richard Stallman
2006-08-04 22:07 ` Nick Roberts
2006-08-04 23:35 ` Kim F. Storm
2006-08-05 5:45 ` David Kastrup
2006-08-06 18:28 ` Richard Stallman
2006-08-06 20:58 ` Nick Roberts
2006-08-04 0:59 ` Nick Roberts
2006-08-03 4:16 ` Chong Yidong
2006-08-03 5:40 ` Nick Roberts
2006-08-03 7:17 ` Romain Francoise
2006-08-03 7:35 ` Stefan Monnier
2006-08-03 19:15 ` Richard Stallman
2006-08-03 19:14 ` Richard Stallman
2006-08-03 15:50 ` Richard Stallman
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