[Bug 646566] Protect against Pad-Parent disappearing

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=646566
  GStreamer | gstreamer (core) | git

--- Comment #21 from Sebastian Dröge <slomo at circular-chaos.org> 2011-04-08 13:27:56 UTC ---
I've committed all these patches now until we find a better solution. This way
the races are at least fixed in the next release and we can find a perfect
solution without any pressure and possibly using a suboptimal solution.

IMHO the best solution for this would be to
a) add a GstObject *parent parameter to all pad callbacks and
b) add a flag to GstPad that you don't want to have your callback called if
there's no parent (and by default that flag is disabled)

For this we have to wait until 0.11 though because it's an API change.

b) might be possible to do in 0.10 by taking a reference of the parent before
calling the callbacks

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