Scott Lamb addeb9d2f6 add a TimerGuard around db locks & ops
I moved the clocks member from LockedDatabase to Database to make this happen,
so the new DatabaseGuard (replacing a direct MutexGuard<LockedDatabase>) can
access it before acquiring the lock.

I also made the type of clock a type parameter of Database (and so several
other things throughout the system). This allowed me to drop the Arc<>, but
more importantly it means that the Clocks trait doesn't need to stay
object-safe. I plan to take advantage of that shortly.
2018-03-23 13:31:23 -07:00
..
2018-03-07 04:42:46 -08:00