K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2016-09-06T17:16:59.620692Z
K 7
svn:log
V 191
cv: do a lockless check for no waiters in cv_signal and cv_broadcastpri

In case of some consumers like zfs there are no waiters vast majority of
the time

Reviewed by:	jhb
MFC after:	1 week

END