GNU bug report logs - #55
SYNC_INPUT and 23.1.

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From: help-debbugs <at> gnu.org (Emacs bug Tracking System)
To: YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>
Subject: bug#55 closed by Jan Djärv <jan.h.d <at> swipnet.se> 
 (Re: SYNC_INPUT and 23.1.)

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This is an automatic notification regarding your bug report
which was filed against the emacs package:

#55: SYNC_INPUT and 23.1.

It has been closed by Jan Djärv <jan.h.d <at> swipnet.se>.

Their explanation is attached below along with your original report.
If this explanation is unsatisfactory and you have not received a
better one in a separate message then please contact Jan Djärv <jan.h.d <at> swipnet.se> by
replying to this email.


-- 
55: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=55
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Contact help-debbugs <at> gnu.org with problems

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From: Jan Djärv <jan.h.d <at> swipnet.se>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>, emacs-devel <at> gnu.org
Subject: Re: SYNC_INPUT and 23.1.
Date: Wed, 09 Apr 2008 08:50:17 +0200

Stefan Monnier skrev:
>>> Sinc there has been no objections, I enabled this by default.  You
>>> can pass --disable-sync-input to configure if there is problems.
>>> But I guess we soon will start take advantage of sync input so the
>>> disabled case will become obsolete.  When we feel confident that
>>> sync input works, I'll remove the non-sync-input code.
> 
>> Even with SYNC_INPUT, atimer functions (except poll_for_input)
>> may still call malloc in the signal handler context.
> 
> That needs to be fixed, then.
> 

I've changed atimers so they are not called in signal handler context.

	Jan D.

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From: YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>
To: rms <at> gnu.org
Cc: jan.h.d <at> swipnet.se, monnier <at> iro.umontreal.ca, emacs-devel <at> gnu.org
Subject: Re: SYNC_INPUT and 23.1.
Date: Thu, 13 Mar 2008 09:44:48 +0900

>>>>> On Wed, 12 Mar 2008 13:51:35 -0400, Richard Stallman <rms <at> gnu.org> said:

>     Even with SYNC_INPUT, atimer functions (except poll_for_input)
>     may still call malloc in the signal handler context.  So
>     emacs_blocked_malloc etc. were actually meaningful even in
>     SYNC_INPUT environments.

> Why is that?  Can it be eliminated?

Here's the list of atimer functions (the third argument to
start_atimer):

  xg_process_timeouts, poll_for_input, show_hourglass,
  create_process_1, x_process_timeouts

Among them, show_hourglass, x_process_timeouts, and
xg_process_timeouts will call async-signal unsafe functions.

I think show_hourglass can be deferred until the next QUIT.  But not
sure about x_process_timeouts and xg_process_timeouts.

				     YAMAMOTO Mitsuharu
				mituharu <at> math.s.chiba-u.ac.jp

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