Leo Yuriev 0f676db491 mdbx: add locking while open/close/drop dbi-handles (avoid dbi-related races).
This avoid races and collisions between threads when opening,
closing and deleting DBI-handles.

unfortunately, this does not resolve collision in the case an one thread
closing the DBI-handle while the another thread performs transaction.

Change-Id: I48c3ffb11a8f83739fae1712db3476645f573e09
2017-05-29 19:38:43 +03:00
..
2017-05-24 02:24:38 +03:00
2017-05-28 17:06:04 +03:00