K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2006-04-19T21:06:52.000000Z
K 7
svn:log
V 199
Implement rw_try_upgrade() and rw_downgrade().  rw_try_upgrade() makes a
single attempt at upgrading a read lock to a write lock, and rw_downgrade()
converts curthread's write lock into a read lock.

END