Number of unconsumed or unsubmitted entries in the
SQ ring
# DESCRIPTION
The [io_uring_sq_ready] function returns the number of unconsumed
(if SQPOLL) or unsubmitted entries that exist in the SQ ring belonging
to the *ring* param.
Usage of this function only applies if the ring has been setup with
**IORING_SETUP_SQPOLL,** where request submissions, and hence
consumption from the SQ ring, happens through a polling thread.
# RETURN VALUE
Returns the number of unconsumed or unsubmitted entries in the SQ ring.
# SEE ALSO
[io_uring_cq_ready]