Commit 95358d2d authored by Alexandre Passos's avatar Alexandre Passos Committed by TensorFlower Gardener
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Changing the copy-on-write semantics of resource variables. 

A variable now has a bit which can be turned on which, when turned on,
makes that variable act as copy-on-read instead of copy-on-write. This
allows sparse writes to happen concurrently while only holding a shared
lock, mimicking the use_locking behavior of ref variables.

PiperOrigin-RevId: 224855851
parent 4e7564ef
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