[gstreamer-bugs] [Bug 505417] New: Add GstPoll to core

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gstreamer (core) | Ver: HEAD CVS
           Summary: Add GstPoll to core
           Product: GStreamer
           Version: HEAD CVS
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: wim.taymans at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


A common functionality in plugins is to perform a cancelable poll() or select()
on a set of file descriptors (udpsrc, multifdsink, rtspsrc...). Most of these
plugins have a custom implementation that is not shared and not necessarily
portable. 

In addition to operating on descriptors, we need an interruptable mechanism for
timeouts in GstClock. 

GstFDSet is currently available in -base/gst/tcp. It does not yet handle all
possible polling mechanisms or the high precision timeouts that ppoll or
pselect can provide.

GMainContext looks like a candidate but it turns out to be too heavy and
requires you to use callbacks instead of the select(), check_fd() sequence. 

We want to add excellent support for windows, which requires us to abstract the
restart and flushing operations.


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