K 10
svn:author
V 7
glebius
K 8
svn:date
V 27
2005-11-02T15:23:47.000000Z
K 7
svn:log
V 490
Fix two races which happen when netgraph is restructuring:
  - Introduce ng_topo_mtx, a mutex to protect topology changes.
  - In ng_destroy_node() protect with ng_topo_mtx the process
    of checking and pointing at ng_deadnode. [1]
  - In ng_con_part2() check that our peer is not a ng_deadnode,
    and protect the check with ng_topo_mtx.
  - Add KASSERTs to ng_acquire_read/write, to make more
    understandible synopsis in case if called on ng_deadnode.

Reported by:	Roselyn Lee [1]

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