Re: why do elements disappear?

[Takashi Iwai <tiwai@suse.de>]

At Wed, 16 Feb 2005 13:14:04 +0100,
Thierry Vignaud wrote:
> 
> Takashi Iwai <tiwai@suse.de> writes:
> 
> > > > > a mixer app of mine (you know, one of those controlling
> > > > > volumes) is updating itself (if other apps change settings) by
> > > > > continuously running get-volume (et al) on all mixer elements
> > > > > every once in a while (10Hz).
> > > > 
> > > > Well, this isn't a good idea.  You should do update passively via
> > > > poll().  The exception is a control with VOLATILE flag like VU
> > > > meter, which won't send change notification.  But normal controls
> > > > send notification if the value is changed, or the control is
> > > > created/deleted, so that the app can react.
> > > 
> > > is this the same bug that affects totem?
> > > 
> > > see totem's gdb trace at
> > > http://qa.mandrakesoft.com/show_bug.cgi?id=13045 and xine strace at
> > > http://qa.mandrakesoft.com/show_bug.cgi?id=13449
> > > (http://qa.mandrakesoft.com/attachment.cgi?id=2444)
> > 
> > They are slightly different problems.  I guess it's indeed a bug of
> > alsa-lib, which was fixed recently on CVS.
> 
> could you point to the relevant fix?
> 

alsa-lib/src/mixer/mixer.c:

	revision 1.70
	date: 2005/02/04 19:18:49;  author: tiwai;  state: Exp;  lines: +2 -2
	Summary: Use bag_for_each_safe() for event handling loop

	Use bag_for_each_safe() for event handling loop.
	Event callbacks may be destructive.


Takashi


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