From: Eli Zaretskii <eliz@gnu.org>
To: Ignacio Casso <ignaciocasso@hotmail.com>
Cc: 54371@debbugs.gnu.org
Subject: bug#54371: 29.0.50; read-char does not reset idle timer in some cases
Date: Sun, 13 Mar 2022 12:08:53 +0200 [thread overview]
Message-ID: <83sfrmkvuy.fsf@gnu.org> (raw)
In-Reply-To: <PAXPR06MB776083EAD7BCD8C4B7C05F62C60E9@PAXPR06MB7760.eurprd06.prod.outlook.com> (message from Ignacio Casso on Sun, 13 Mar 2022 00:27:59 +0100)
> From: Ignacio Casso <ignaciocasso@hotmail.com>
> Date: Sun, 13 Mar 2022 00:27:59 +0100
>
> If I evaluate the following snippet, after 3 seconds Emacs prompts me
> for a character and prints nil.
>
> (defun my-test ()
> (read-char "> " nil nil)
> (message "%s" (current-idle-time)))
>
> (run-with-timer 3 nil 'my-test)
>
> However, if I evaluate the following snippet instead, where the last
> argument of read-char is changed to the number of seconds the prompt
> should wait at most for user input, it prints (0 K _ _), where K is 3
> seconds plus whatever time in seconds you took to answer the
> prompt. This means that right after reading a character from user input
> Emacs still thinks it has been idle for a while.
>
> (defun my-test ()
> (read-char "> " nil 10)
> (message "%s" (current-idle-time)))
>
> (run-with-timer 3 nil 'my-test)
>
> This is the reason behind a bug that occurs when resolving the running
> org clock after some idle time, for which I have seen reports more than
> 10 years old but not as much discussion as I would expect. This makes me
> think that Emacs does not behave like this for most systems and the
> problem is particular to my setup. My setup should not be particular in
> any sense however, just an Ubuntu 20.04 with default and standard
> packages. Emacs' is the only configuration I have ever tweaked in my
> machine, and this happens also with "emacs -Q", so it's not that.
>
> Can you please evaluate the second snippet to try to reproduce this in
> your machine?
I can reproduce this.
However, it sounds like we do this on purpose, to avoid problems with
idle timers that call sit-for. See the discussion that started here:
https://lists.gnu.org/archive/html/emacs-devel/2006-08/msg00395.html
The change installed at that time made read_char avoid restarting idle
timers when it is called with a non-nil END_TIME argument.
next prev parent reply other threads:[~2022-03-13 10:08 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-12 23:27 bug#54371: 29.0.50; read-char does not reset idle timer in some cases Ignacio Casso
2022-03-13 10:08 ` Eli Zaretskii [this message]
2022-03-13 10:48 ` Ignacio Casso
2022-03-13 15:02 ` Lars Ingebrigtsen
2022-03-13 16:43 ` Eli Zaretskii
2022-03-13 17:45 ` Ignacio Casso
2022-03-13 19:34 ` Eli Zaretskii
2022-03-13 21:58 ` Ignacio Casso
2022-04-01 18:22 ` Ignacio Casso
2022-04-01 19:36 ` Eli Zaretskii
2022-04-07 11:42 ` Ignacio Casso
2022-04-08 6:50 ` Eli Zaretskii
2022-04-11 6:42 ` Ignacio Casso
2022-04-11 11:17 ` Eli Zaretskii
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