Re: Timers and sentinels

[Helmut Eller <eller.helmut@gmail.com>]

* Lars Magne Ingebrigtsen [2010-09-26 13:24] writes:

> Hm.  What I'm seeing is that (possibly) the function being run from the
> timer is interrupted by an image insertion, and the latter is being run
> off of url-fetch, which, I guess, is a sentinel function.  Which might
> be triggered when the subprocess exits...  Hm...  but is that possible?

No.  The only "interrupt" at Lisp level is C-g.  Everything else is
called by the event loop.  C level signal handlers have to put stuff in
a queue and the event loop will look there when it gets to it.  C level
signal handlers can't call Lisp code (just imagine what would happen if
the GC were interrupted by a signal and the signal handler would call
Lisp code).

With timers you have to watch out for the (IMO counterproductive)
condition-case in timer-event-handler which swallows all errors without
giving you a notice.

Helmut