bug#12447: 24.1.50; Stuck in garbage collection on OS X

[Dmitry Gutov]

Eli Zaretskii <eliz@gnu.org> writes:

>> Date: Sat, 15 Sep 2012 16:23:53 +0200 (CEST)
>> Cc: jan.h.d@swipnet.se, 12447@debbugs.gnu.org
>> From: Harald Hanche-Olsen <hanche@math.ntnu.no>
>>
>> For example: Is it okay to set a timer in a timer callback?
>
> I don't see why not.  Setting up a timer just creates a Lisp object
> and adds it to the list of timers.  The timer will be run the next
> time the low-level mechanism, which is part of the Emacs exec loop,
> determines that it's ripe.

In js2-mode's case, the problem is that 'run-with-idle-timer' makes the
created timer run now, not the "next time".  Here's an example:

  (defvar counter 0)

  (defun foo ()
    (message (format  "foo %s" counter))
    (incf counter)
    (run-with-idle-timer 1 nil #'foo))

  (foo)

I'd expect that either timer would fire once every second (as long as
I'm not touching my keyboard), or at least stop firing when I do touch
my keyboard (seeing as otherwise Emacs is idle), but instead I just see
the timer firing many times a second, the counter runs in the message
area, and Emacs doesn't respond to any commands.