K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2017-11-25T20:10:33.825338Z
K 7
svn:log
V 296
locks: retry turnstile/sleepq loops on failed cmpset

In order to go to sleep threads set waiter flags, but that can spuriously
fail e.g. when a new reader arrives. Instead of unlocking everything and
looping back, re-evaluate the new state while still holding the lock necessary
to go to sleep.

END