[Bug 728596] New: A lock is released without being previously locked

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=728596
  GStreamer | gstreamer (core) | 1.2.4

           Summary: A lock is released without being previously locked
    Classification: Platform
           Product: GStreamer
           Version: 1.2.4
        OS/Version: FreeBSD
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: gustau.perez at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


In libs/gst/base/gstbasesrc.c:2817 the src object gets unlocked without
previously being locked. Because of that the app using gstreamer gets killed
because of a wrong unlock in platforms like FreeBSD. 

The GST_LIVE_UNLOCK at the end calls g_mutex_unlock which then call
pthread_mutex_unlock. Doing that call to pthread_mutex_unlock breaks badly in
some platforms. 

One solution would be to try to lock before unlocking. If we already hold the
mutex the pthread_mutex_lock will not block. That way the unlock will not fail.

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