K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2016-08-10T15:24:15.856318Z
K 7
svn:log
V 135
sigio: do a lockless check in funsetownlist

There is no need to grab the lock first to see if sigio is used, and it
typically is not.

END