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bug#60144: 30.0.50; PGTK Emacs crashes after signal
From: |
Po Lu |
Subject: |
bug#60144: 30.0.50; PGTK Emacs crashes after signal |
Date: |
Sun, 18 Dec 2022 17:52:42 +0800 |
User-agent: |
Gnus/5.13 (Gnus v5.13) |
Eli Zaretskii <eliz@gnu.org> writes:
>> > Do you understand why note_mouse_highlight was called in this
>> > scenario? The backtrace seems strange: why should GTK care about our
>> > mouse highlight?
>>
>> What happens here is that Emacs is reading input through GTK, either
>> inside xg_select or the read_socket_hook. GTK then detects some mouse
>> motion and calls the motion event handler for the frame's widget, which
>> in turn calls note_mouse_movement.
>
> Why this fragile architecture of reading input events? Calling
> functions of our Lisp machine from context where those functions
> cannot signal an error is very dangerous, and cannot work well in
> Emacs. Why cannot we have the reads through GTK only deliver events
> to us, which we enqueue to our own event queue, and then we could
> process that queue in the safe context of the Lisp machine, as (AFAIK)
> we do on other platforms?
No, signalling there is equally unsafe on the other platforms, where
note_mouse_highlight is called from the same place(s): read_socket_hook,
event_handler_gdk, et cetera. Just look at the callers of
x_note_mouse_movement in xterm.c, or [EmacsView mouseMoved:] in
nsterm.m.
But I see you already fixed the bug. Thanks.
- bug#60144: 30.0.50; PGTK Emacs crashes after signal, Karl Otness, 2022/12/16
- bug#60144: 30.0.50; PGTK Emacs crashes after signal, Po Lu, 2022/12/17
- bug#60144: 30.0.50; PGTK Emacs crashes after signal, Eli Zaretskii, 2022/12/18
- bug#60144: 30.0.50; PGTK Emacs crashes after signal, Po Lu, 2022/12/18
- bug#60144: 30.0.50; PGTK Emacs crashes after signal, Eli Zaretskii, 2022/12/18
- bug#60144: 30.0.50; PGTK Emacs crashes after signal,
Po Lu <=
- bug#60144: 30.0.50; PGTK Emacs crashes after signal, Eli Zaretskii, 2022/12/18
- bug#60144: 30.0.50; PGTK Emacs crashes after signal, Po Lu, 2022/12/18
- bug#60144: 30.0.50; PGTK Emacs crashes after signal, Eli Zaretskii, 2022/12/18
- bug#60144: 30.0.50; PGTK Emacs crashes after signal, Po Lu, 2022/12/18
- bug#60144: 30.0.50; PGTK Emacs crashes after signal, Eli Zaretskii, 2022/12/18