[Bug 750397] CRITICAL: Race condition in GstBus

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=750397

--- Comment #69 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 330576
  --> https://bugzilla.gnome.org/attachment.cgi?id=330576&action=edit
poll: Clarify when FALSE is returned from read/write_control()

And also mention what the expected values of errno are going to be.

write_control() will only ever return FALSE if there was a critical error. It
will never return because of EINTR, EAGAIN or EWOULDBLOCK.

read_control() will return FALSE if there was no byte to read, in which case
errno would be EWOULDBLOCK.
In all other cases there was a critical error.

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