Robert Watson d1da0a0672 Add address list locking for in6_ifaddrhead/ia_link: as with locking
for in_ifaddrhead, we stick with an rwlock for the time being, which
we will revisit in the future with a possible move to rmlocks.

Some pieces of code require significant further reworking to be
safe from all classes of writer-writer races.

Reviewed by:	bz
MFC after:	6 weeks
2009-06-25 16:35:28 +00:00
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