[Bug 771699] New: gst_clock_id_wait waits for too long

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=771699

            Bug ID: 771699
           Summary: gst_clock_id_wait waits for too long
    Classification: Platform
           Product: GStreamer
           Version: 1.8.3
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: mezin.alexander at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I use gst_clock_new_single_shot_id + gst_clock_id_wait for synchronization
(with system clock). Usually the target time is ~10 milliseconds in the future.
When the application window is in background for some time, gst_clock_id_wait
starts to block for 10 seconds. Printing gst_clock_get_time() shows 10 second
difference too (and it is 10 seconds later than GstClockID's target time). But
jitter value returned by gst_clock_id_wait is very small (microseconds).

Activating the window immediately "fixes" the problem. And the problem doesn't
occur when the window is in foreground.

If I disable timer coalescing (sudo sysctl -w kern.timer.coalescing_enabled=0),
the problem doesn't occur too.

OS: macOS Sierra (probably happens on older versions too)

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