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

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.