Luigi Rizzo 997b054cf1 introduce mbq_lock() and mbq_unlock() for the mbq,
so it is easier to buil the same code on linux
(this generalizes the change in svn 267142)

MFC after:	3 days
2014-06-06 18:02:32 +00:00
..
2014-06-06 14:57:40 +00:00