[Bug 761586] systemclock: regression causing audiomixer to stall

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761586

--- Comment #8 from Stian Selnes (stianse) <stian.selnes at gmail.com> ---
Created attachment 320783
  --> https://bugzilla.gnome.org/attachment.cgi?id=320783&action=edit
The previously proposed patch improves the situation, but is not complete.

This patch fixes a possible race on top of that patch and adds a couple of
tests
that triggers the issues fixed by both the previous and this patch. They should
probably be squashed before applied?

---

systemclock: Fix wait/unschedule race

Fixes a race where an entry is set to BUSY in
gst_system_clock_id_wait_jitter() and is UNSCHEDULED before
gst_system_clock_id_wait_jitter_unlocked() starts processing it. The
wakeup added by gst_system_clock_id_unschedule() must be cleaned up.

Two stress tests are added. One test that triggers the specific issue
described above. The second stresses the code path where a wait is
rescheduled because the poll returned early.

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