GNU bug report logs - #5822
run-at-time and Setting system time

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: chandan <chandan.babu <at> globaledgesoft.com>
To: help-gnu-emacs <at> gnu.org, bug-gnu-emacs <at> gnu.org
Subject: run-at-time and Setting system time
Date: Fri, 02 Apr 2010 12:29:42 +0530

Hi,
   Consider the following code:

(defun mwnn-timer-callback ()
 (message "Hi, inside mwnn-timer-callback"))

(run-at-time "60" nil 'mwnn-timer-callback)

The above code is supposed to cause mwnn-timer-callback to get invoked 
after 60 seconds. But if the system time is changed to a future date 
(say 20 seconds after the timer is started) the timer fires immediately.

Is this is a bug in the emacs code. If yes, can this be rectified?

Regards,
mwnn

Message #8 received at 5822 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: chandan <chandan.babu <at> globaledgesoft.com>
Cc: 5822 <at> debbugs.gnu.org, help-gnu-emacs <at> gnu.org
Subject: Re: bug#5822: run-at-time and Setting system time
Date: Fri, 02 Apr 2010 20:40:26 +0300

> Date: Fri, 02 Apr 2010 12:29:42 +0530
> From: chandan <chandan.babu <at> globaledgesoft.com>
> Cc: 
> 
> (defun mwnn-timer-callback ()
>   (message "Hi, inside mwnn-timer-callback"))
> 
> (run-at-time "60" nil 'mwnn-timer-callback)
> 
> The above code is supposed to cause mwnn-timer-callback to get invoked 
> after 60 seconds. But if the system time is changed to a future date 
> (say 20 seconds after the timer is started) the timer fires immediately.
> 
> Is this is a bug in the emacs code. If yes, can this be rectified?

I think this how the timers are supposed to behave.  They are not
interval timers, if that's what you expected.

Message #11 received at 5822 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: chandan <chandan.babu <at> globaledgesoft.com>
Cc: 5822 <at> debbugs.gnu.org, help-gnu-emacs <at> gnu.org
Subject: Re: bug#5822: run-at-time and Setting system time
Date: Fri, 02 Apr 2010 14:55:25 -0400

Please don't cross-post to the help and bug lists.

Anyone reading this on help-gnu-emacs, please use 5822 at
debbugs.gnu.org in place of bug-gnu-emacs in any replies. (Otherwise
every reply creates a new bug report.)


If you really want to cc another address when filing a new bug report,
please use an X-Debbugs-CC header instead of a Cc header, as explained
here:

http://debbugs.gnu.org/Reporting.html#xcc

Yes, it is a bit confusing at first.

Thanks.

Message #16 received at 5822 <at> debbugs.gnu.org (full text, mbox):

From: chandan <chandan.babu <at> globaledgesoft.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 5822 <at> debbugs.gnu.org, help-gnu-emacs <at> gnu.org
Subject: Re: bug#5822: run-at-time and Setting system time
Date: Sun, 05 Apr 2009 09:14:35 +0530

Eli Zaretskii wrote:
>> Date: Fri, 02 Apr 2010 12:29:42 +0530
>> From: chandan <chandan.babu <at> globaledgesoft.com>
>> Cc: 
>>
>> (defun mwnn-timer-callback ()
>>   (message "Hi, inside mwnn-timer-callback"))
>>
>> (run-at-time "60" nil 'mwnn-timer-callback)
>>
>> The above code is supposed to cause mwnn-timer-callback to get invoked 
>> after 60 seconds. But if the system time is changed to a future date 
>> (say 20 seconds after the timer is started) the timer fires immediately.
>>
>> Is this is a bug in the emacs code. If yes, can this be rectified?
>>     
>
> I think this how the timers are supposed to behave.  They are not
> interval timers, if that's what you expected.
>
>   
Emacs seems to use setitimer & getitimer (interval timers) for 
implementing the timer module. This may be the cause of the problem. 
Using timer_create, timer_delete, timer_settime, timer_gettime etc.

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