Robert Watson d7924b7086 Clarify and update quite a few comments to reflect locking optimizations,
the addition of unpcb refcounts, and bug fixes.  Some of these fixes are
appropriate for MFC.

MFC after:	3 days
2007-05-11 12:10:45 +00:00
..
2007-05-02 01:03:10 +00:00
2007-05-10 08:53:57 +00:00
2007-05-05 11:07:52 +00:00
2006-11-28 19:33:28 +00:00
2007-05-09 09:02:11 +00:00
2007-05-03 22:39:52 +00:00