K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2019-12-05T13:43:44.876503Z
K 7
svn:log
V 252
sx: check for SX_LOCK_SHARED | SX_LOCK_WRITE_SPINNER when exclusive-locking

First, this removes a spurious difference compared to rw locks.
More importantly though this avoids a trip through sleepq code if the lock
happens to be caught in this state.

END