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Would `volatile` help with the barrier?

Re the multi-threading issue, it should be possible to stop the profiler thread in the hook, if we keep a reference to the thread, no?

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The fields are final, so they can't be volatile. :-) Using one of the fence methods on VarHandles would ensure the correct ordering. To stop the profiler thread it would be best to provide a controlled method of doing it, there's a lot of way it can be implemented but you probably want to signal it in some way and then do a join() to wait while it shuts down cleanly.

Thanks, I implemented it using a boolean flag.

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