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From: "Gerd Möllmann" <gerd.moellmann@gmail.com>
To: Pip Cet <pipcet@protonmail.com>
Cc: "Óscar Fuentes" <ofv@wanadoo.es>,
	emacs-devel@gnu.org, "Helmut Eller" <eller.helmut@gmail.com>,
	"Andrea Corallo" <acorallo@gnu.org>
Subject: Freezing frame with igc
Date: Wed, 25 Dec 2024 05:25:06 +0100	[thread overview]
Message-ID: <m2wmfotmn1.fsf_-_@gmail.com> (raw)
In-Reply-To: <87msgkaeyy.fsf@protonmail.com> (Pip Cet's message of "Tue, 24 Dec 2024 22:34:12 +0000")

(Subject changed.)

Pip Cet <pipcet@protonmail.com> writes:

> Óscar Fuentes <ofv@wanadoo.es> writes:
>
>> Pip Cet <pipcet@protonmail.com> writes:
>>
>>>> Redisplay just stopped while showing the menu, no crash nor infinite
>>>> loop, its CPU usage was typical for the repeating timers that my config
>>>> creates.
>>>
>>> That's a bit odd.  It might be the signal issue, but that's purely a
>>> guess.  If it happens again, please let us know.
>>
>> Sure.
>
> I'm not a hundred percent sure, because I was testing other changes, but
> I just observed an Emacs session in a very similar state to what you
> describe: very little but nonzero CPU usage, but unresponsive to X
> interactions.  I attached gdb, observed it was stuck in read_char, then
> I messed up and set Vquit_flag to Qt, at which point the Emacs session
> recovered and seems fully usable once more (it did take a while to do
> so, though).  So no valuable debug info this time, hope I'll hit it
> again.
>
> Again, it's possible this is a similar-looking but different bug,
> possibly caused by local changes.
>
> I don't think read_char or its subroutines even use MPS memory, though?
> As this is a GTK build, and yours wasn't, we should probably look at X
> interaction code shared between the GTK and non-GTK builds.
>
> Pip

That reminds of something. Maybe what you've seen is completely
unrelated, it's impossible to tell, but please find below a comment that
I added to do_switch_frame in frame.c.

  /* We want to make sure that the next event generates a frame-switch
     event to the appropriate frame.  This seems kludgy to me, but
     before you take it out, make sure that evaluating something like
     (select-window (frame-root-window (make-frame))) doesn't end up
     with your typing being interpreted in the new frame instead of
     the one you're actually typing in.  */

  /* FIXME/tty: I don't understand this.  (The comment above is from
     Jim BLandy 1993 BTW, and the frame_ancestor_p from 2017.)

     Setting the last event frame to nil leads to switch-frame events
     being generated even if they normally wouldn't be because the frame
     in question equals selected-frame.  See the places in keyboard.c
     where make_lispy_switch_frame is called.

     This leads to problems at least on ttys.

     Imagine that we have functions in post-command-hook that use
     select-frame in some way (e.g., with-selected-window).  Let these
     functions select different frames during the execution of
     post-command-hook in command_loop_1.  Setting
     internal_last_event_frame to nil here makes these select-frame
     calls (potentially and in reality) generate switch-frame events.
     (But only in one direction (frame_ancestor_p), which I also don't
     understand).

     These switch-frame events form an endless loop in
     command_loop_1.  It runs post-command-hook, which generates
     switch-frame events, which command_loop_1 finds (bound to '#ignore)
     and executes, which again runs post-command-hook etc., ad
     infinitum.

     Let's not do that for now on ttys.  */





  reply	other threads:[~2024-12-25  4:25 UTC|newest]

Thread overview: 106+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-12-22 15:40 Some experience with the igc branch Óscar Fuentes
2024-12-22 17:18 ` Gerd Möllmann
2024-12-22 17:29 ` Gerd Möllmann
2024-12-22 17:41 ` Pip Cet via Emacs development discussions.
2024-12-22 17:56   ` Gerd Möllmann
2024-12-22 19:11   ` Óscar Fuentes
2024-12-23  0:05     ` Pip Cet via Emacs development discussions.
2024-12-23  1:00       ` Óscar Fuentes
2024-12-24 22:34         ` Pip Cet via Emacs development discussions.
2024-12-25  4:25           ` Gerd Möllmann [this message]
2024-12-25 11:19             ` Freezing frame with igc Pip Cet via Emacs development discussions.
2024-12-25 11:55             ` Óscar Fuentes
2024-12-23  3:42       ` Some experience with the igc branch Gerd Möllmann
2024-12-23  6:27     ` Jean Louis
2024-12-22 20:29   ` Helmut Eller
2024-12-22 20:50   ` Gerd Möllmann
2024-12-22 22:26     ` Pip Cet via Emacs development discussions.
2024-12-23  3:23       ` Gerd Möllmann
     [not found]         ` <m234ieddeu.fsf_-_@gmail.com>
     [not found]           ` <87ttaueqp9.fsf@protonmail.com>
     [not found]             ` <m2frme921u.fsf@gmail.com>
     [not found]               ` <87ldw6ejkv.fsf@protonmail.com>
     [not found]                 ` <m2bjx2h8dh.fsf@gmail.com>
2024-12-23 14:45                   ` Make Signal handling patch platform-dependent? Pip Cet via Emacs development discussions.
2024-12-23 14:54                     ` Gerd Möllmann
2024-12-23 15:11                       ` Eli Zaretskii
2024-12-23 13:35       ` Some experience with the igc branch Eli Zaretskii
2024-12-23 14:03         ` Discussion with MPS people Gerd Möllmann
2024-12-23 14:04           ` Gerd Möllmann
2024-12-23 15:07         ` Some experience with the igc branch Pip Cet via Emacs development discussions.
2024-12-23 15:26           ` Gerd Möllmann
2024-12-23 16:03             ` Pip Cet via Emacs development discussions.
2024-12-23 16:44               ` Eli Zaretskii
2024-12-23 17:16                 ` Pip Cet via Emacs development discussions.
2024-12-23 18:35                   ` Eli Zaretskii
2024-12-23 18:48                     ` Gerd Möllmann
2024-12-23 19:25                       ` Eli Zaretskii
2024-12-23 20:30                     ` Benjamin Riefenstahl
2024-12-23 23:39                       ` Pip Cet via Emacs development discussions.
2024-12-24 12:14                         ` Eli Zaretskii
2024-12-24 13:18                           ` Pip Cet via Emacs development discussions.
2024-12-24 13:42                           ` Benjamin Riefenstahl
2024-12-24  3:37                       ` Eli Zaretskii
2024-12-24  8:48                         ` Benjamin Riefenstahl
2024-12-24 13:52                           ` Eli Zaretskii
2024-12-24 13:54                             ` Benjamin Riefenstahl
2024-12-23 17:44               ` Gerd Möllmann
2024-12-23 19:00                 ` Eli Zaretskii
2024-12-23 19:37                   ` Eli Zaretskii
2024-12-23 20:49                   ` Gerd Möllmann
2024-12-23 21:43                     ` Helmut Eller
2024-12-23 21:49                       ` Pip Cet via Emacs development discussions.
2024-12-23 21:58                         ` Helmut Eller
2024-12-23 23:20                           ` Pip Cet via Emacs development discussions.
2024-12-24  5:38                             ` Helmut Eller
2024-12-24  6:27                               ` Gerd Möllmann
2024-12-24 10:09                               ` Pip Cet via Emacs development discussions.
2024-12-24  4:05                       ` Gerd Möllmann
2024-12-24  8:50                         ` Gerd Möllmann
2024-12-24  6:03                     ` SIGPROF + SIGCHLD and igc Gerd Möllmann
2024-12-24  8:23                       ` Helmut Eller
2024-12-24  8:39                         ` Gerd Möllmann
2024-12-25  9:22                           ` Helmut Eller
2024-12-25  9:43                             ` Gerd Möllmann
2024-12-24 13:05                         ` Eli Zaretskii
2024-12-25 10:46                           ` Helmut Eller
2024-12-25 12:45                             ` Eli Zaretskii
2024-12-24 12:54                       ` Eli Zaretskii
2024-12-24 12:59                         ` Gerd Möllmann
2024-12-23 23:37                   ` Some experience with the igc branch Pip Cet via Emacs development discussions.
2024-12-24  4:03                     ` Gerd Möllmann
2024-12-24 10:25                       ` Pip Cet via Emacs development discussions.
2024-12-24 10:50                         ` Gerd Möllmann
2024-12-24 13:15                         ` Eli Zaretskii
2024-12-24 12:26                       ` Eli Zaretskii
2024-12-24 12:56                         ` Gerd Möllmann
2024-12-24 13:19                           ` Pip Cet via Emacs development discussions.
2024-12-24 13:38                             ` Gerd Möllmann
2024-12-24 13:46                           ` Eli Zaretskii
2024-12-24 14:12                             ` Gerd Möllmann
2024-12-24 14:40                               ` Eli Zaretskii
2024-12-25  4:56                                 ` Gerd Möllmann
2024-12-25 12:19                                   ` Eli Zaretskii
2024-12-25 12:50                                     ` Gerd Möllmann
2024-12-25 13:00                                       ` Eli Zaretskii
2024-12-25 13:08                                         ` Gerd Möllmann
2024-12-25 13:26                                           ` Eli Zaretskii
2024-12-25 14:07                                             ` Gerd Möllmann
2024-12-25 14:43                                               ` Helmut Eller
2024-12-25 14:59                                                 ` Eli Zaretskii
2024-12-25 15:02                                                 ` Gerd Möllmann
2024-12-25 13:09                                       ` Eli Zaretskii
2024-12-25 13:46                                         ` Gerd Möllmann
2024-12-25 14:37                                           ` Eli Zaretskii
2024-12-25 14:57                                             ` Gerd Möllmann
2024-12-25 15:28                                               ` Eli Zaretskii
2024-12-25 15:49                                                 ` Gerd Möllmann
2024-12-25 17:26                                                   ` Eli Zaretskii
2024-12-25 17:40                                       ` Pip Cet via Emacs development discussions.
2024-12-25 17:51                                         ` Eli Zaretskii
2024-12-24 21:18                               ` Pip Cet via Emacs development discussions.
2024-12-25  5:23                                 ` Gerd Möllmann
2024-12-25 10:48                                   ` Pip Cet via Emacs development discussions.
2024-12-25 13:40                                     ` Stefan Kangas
2024-12-25 17:03                                       ` Pip Cet via Emacs development discussions.
2024-12-25 11:48                                   ` Helmut Eller
2024-12-25 11:58                                     ` Gerd Möllmann
2024-12-25 12:52                                     ` Eli Zaretskii
2024-12-25 12:31                                   ` Eli Zaretskii
2024-12-25 12:54                                     ` Gerd Möllmann
2024-12-24 12:11                     ` Eli Zaretskii

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