RFR: 8367013: Add Atomic<T> to package/replace idiom of volatile var plus AtomicAccess:: operations

[David Holmes]

On Mon, 6 Oct 2025 10:19:52 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> A more accurate way to view Atomic::release_store is that the memory synchronization is intrinsically tied to the store operation — not before it, not after it. 

It has to be before it in the sense that the store cannot float ahead of the memory synchronization action - otherwise it could be reordered with other stores and that would break things.

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PR Comment: https://git.openjdk.org/jdk/pull/27539#issuecomment-3374789698