[Bug 772747] New: gstatomicqueue: Improve performance on push operations

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772747

            Bug ID: 772747
           Summary: gstatomicqueue: Improve performance on push operations
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: sancane.kurento at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 337414
  --> https://bugzilla.gnome.org/attachment.cgi?id=337414&action=edit
Patch

We have detected that on big pipelines involving a great number of elements and
processes competing to post messages on the bus, the amount of time spent on
single push operations rapidly increase, we have detected that it can even
reach a magnitude of seconds. This issue is caused because the current
algorithm forces processes to wait until previous writers finalize
sequentially. This patch allow faster writers to finalize the push operation
without waiting for slower writers. Those slow processes are responsible of
updating the read index so that processes can pop data at the right position,
never beyond the index imposed by the slowest writer.
This issue might be related to the bug reported by Miguel París Díaz
(https://bugzilla.gnome.org/show_bug.cgi?id=768668opened) who detected a long
busy-waiting with gdb.

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