RFR: 8338383: Implement JEP 491: Synchronize Virtual Threads without Pinning

[Patricio Chilano Mateo]

On Thu, 31 Oct 2024 16:34:41 GMT, Patricio Chilano Mateo <pchilanomate at openjdk.org> wrote:

>> General convention is that racily accessed variables should be accessed via Atomic::load/store to make it clear(er) they are racy accesses. But I agree it seems odd when direct accesses to `_succ` in the main cpp file are not atomic.
>
>> Why are _succ accesses atomic here when previously they were not?
>>
> They should had always been atomic.

> But I agree it seems odd when direct accesses to _succ in the main cpp file are not atomic.
>
There was only one remaining direct access in debugging function `print_debug_style_on` which I fixed now.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21565#discussion_r1824794795