[gstreamer-bugs] [Bug 339574] New: Race condition in multifdsink can lead to spurious duplicate clients

[GStreamer (bugzilla.gnome.org)]

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 GStreamer | gst-plugins-base | Ver: HEAD CVS

           Summary: Race condition in multifdsink can lead to spurious
                    duplicate clients
           Product: GStreamer
           Version: HEAD CVS
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: msmith at fluendo.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


multifdsink has a client-removed signal, which is intended to be used so that
an application can call the get-stats signal, and then close the file
descriptor.

Unfortunately, if you do this, a new file descriptor (for a new client) with
the same value as the old one you just closed, could get added before
multifdsink removes the FD from its data-structures.

Multifdsink would reject this as a duplicate (which it is not).

To fix this, we need to add a new signal that is fired only once multifdsink no
longer has any reference to the FD, to indicate to the application that it's
safe to close (and thus later reuse) that FD.


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