[Bug 721253] multiqueue: May cause hanging if shut down while handling a serialized query

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=721253
  GStreamer | gstreamer (core) | 1.0.5

--- Comment #7 from zhangyanping <zhangyanping210 at 163.com> 2014-01-03 06:04:51 UTC ---
Created an attachment (id=265201)
 View: https://bugzilla.gnome.org/attachment.cgi?id=265201
 Review: https://bugzilla.gnome.org/review?bug=721253&attachment=265201

fix multiqueue hanging when stopping

signal query_handled when stopping multiqueue

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