RFR #2 (M) 8148146: Integrate new internal Unsafe entry points, and basic intrinsic support for VarHandles

[Andrew Haley]

On 04/07/16 22:09, David Holmes wrote:
> Surely cmpxchg already ensures the store (if it happens) is visible in 
> other threads - else the cmpxchg would not even operate correctly.

No, it doesn't.  Semantically, the cmpxchg is no more than an atomic
operation on a single word: it has no other memory ordering effects.
If you want the store to be observed before some other memory access
you have to do something to make that happen.

Andrew.