K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2017-12-31T00:47:04.696777Z
K 7
svn:log
V 395
locks: re-check the reason to go to sleep after locking sleepq/turnstile

In both rw and sx locks we always go to sleep if the lock owner is not
running.

We do spin for some time if the lock is read-locked.

However, if we decide to go to sleep due to the lock owner being off cpu
and after sleepq/turnstile gets acquired the lock is read-locked, we should
fallback to the aforementioned wait.

END