[Bug 750397] CRITICAL: Race condition in GstBus

[GStreamer (GNOME Bugzilla)]

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

--- Comment #10 from Matt Gruenke <mgruenke at tycoint.com> ---
(In reply to Jan Schmidt from comment #5)
> it's not safe to write_control and read_control simultaneously from
> different threads when read_control can successfully decrement the
> control_pending atomic int to 0 and then fail to read a byte.

It's plausible even writing and reading from the same thread could leave
GstPoll in a bad state, depending on how a given platform implements
socketpair().  Clearing O_NONBLOCK on control_read_fd.fd fixes this.

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