RFR: 8366671: Refactor Thread::SpinAcquire and Thread::SpinRelease [v6]

[Kim Barrett]

On Wed, 19 Nov 2025 14:03:32 GMT, Anton Artemov <aartemov at openjdk.org> wrote:

>> src/hotspot/share/utilities/spinCriticalSection.hpp line 45:
>> 
>>> 43: class SpinCriticalSection {
>>> 44: private:
>>> 45:   volatile int* const _lock;
>> 
>> Use new `Atomic<T>` rather than introducing new direct uses of `AtomicAccess`.
>
> This will require somewhat extensive changes in JFR, as the are using the same thing for their JfrTryLock.

OK, leave it to the "upgrade all the world to use `Atomic<T>`" task with it's many subtasks. (There isn't
such a thing in JBS; I've just been linking new RFEs to JDK-8367013.)

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PR Review Comment: https://git.openjdk.org/jdk/pull/28264#discussion_r2543432729