[Bug 752651] decodebin: segfault on setting to NULL

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752651

--- Comment #41 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Vincent Penquerc'h from comment #40)

> I don't really get the comment about the ref on the signal connect. I don't
> think that'd help anyway, as the signal might have been just triggered at
> the time the chain starts getting destroyed (ie, the chain starts getting
> destroyed just after pad_added_cb released the chain mutex lock, but before
> analyze_new_pad is called.

My assumption was that destroying the chain would only happen then once the
signal is actually disconnected (i.e. the element we connected to gets
destroyed). If you use g_signal_connect_data() and pass as GDestroyNotify the
unref function of the chain, then the last reference of the chain will never
get to refcount 0 while the signal is still connected (or being emitted).

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