Valentin Shergin d150cbc298 Fabric: Using RW-like shared lock in ShadowTreeRegistry
Summary:
`ShadowTree` class is already thread-safe, so we don't need to (we should not) guard concurent access to it.
We should guard concurrent write-access to the collection of them though.
Note that unordered_map is "thread-compatible" collection, so concurrent reading access is okay.

Reviewed By: mdvacca

Differential Revision: D13269745

fbshipit-source-id: 4779626018da0e42b81a835e538f6c1d1a8e25f7
2018-11-30 17:29:31 -08:00
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2018-10-31 01:37:26 -07:00