errno contains the detailed error code but will never be EAGAIN, EINTR or EWOULDBLOCK. false always signals a critical error.
Poll.writeControl
bool writeControl()Write a byte to the control socket of the controllable set. This function is mostly useful for timer #GstPoll objects created with gst.poll.Poll.newTimer.
It will make any current and future gst.poll.Poll.wait function return with 1, meaning the control socket is set. After an equal amount of calls to gst.poll.Poll.readControl have been performed, calls to gst.poll.Poll.wait will block again until their timeout expired.
This function only works for timer #GstPoll objects created with gst.poll.Poll.newTimer.
Returns
true on success. false when when the byte could not be written.