markj 0e3d68b2b4 Add a taskqueue_quiesce(9) KPI.
This is similar to taskqueue_drain_all(9) but will wait for the queue
to become idle before returning instead of only waiting for
already-enqueued tasks to finish.  This will be used in the opensolaris
compat layer.

PR:		227784
Reviewed by:	cem
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D17975
2018-11-21 17:18:27 +00:00
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