Re: Errors in timers

[Lennart Borgman (gmail)]

Andreas Schwab wrote:
> "Lennart Borgman (gmail)" <address@hidden> writes:
>
> > How is errors in timers supposed to be handled? It looks like those errors
> > are only seen if you set debug-on-signal.
>
> Timer functions are run inside condition-case, so error are caught and
> ignored.  See timer-event-handler.

Yes, I do not remember exactly why it was added now, but I think it 
would be very good to be able to see the errors to. Currently the only 
way is to set debug-on-signal to t and that is a real sledge hammer.

As I see it it would be good to take care of this individually for 
different timers.

I have no proposal for exactly how. The need might be a bit different 
from when running a function directly. Timers can for example be run 
repeatedly and maybe the fail sometimes and otherwise perform well. 
Stopping them with a trace back might not be that good then. Perhaps 
some kind of logging is better in such cases.

I myself currently put a highlighted traceback in the message buffer and 
give a single message line to the user about that.