kern/57945: [patch] Add locking to kqueue to make it MP-safe

[John-Mark Gurney]

Synopsis: [patch] Add locking to kqueue to make it MP-safe

Responsible-Changed-From-To: freebsd-bugs->jmg
Responsible-Changed-By: jmg
Responsible-Changed-When: Thu Nov 6 10:50:18 PST 2003
Responsible-Changed-Why: 
I'll take this.  I was thinking of trying to make the lists atomic,
but then realized that can't/won't happen with LISTQ's, so this lock
patch is probably good.

http://www.freebsd.org/cgi/query-pr.cgi?pr=57945