RFR: 8288904: Incorrect memory ordering in UL [v2]

[David Holmes]

On Wed, 22 Jun 2022 07:45:26 GMT, Johan Sjölén <duke at openjdk.org> wrote:

>> Please review this fix for JDK-8288904, thank you.
>> 
>> Currently running tier1-3 tests.
>
> Johan Sjölén has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Comment the loadstore

This fix in itself looks good.

But it raises a lot of questions for me about how concurrent access is actual controlled here. I can't see what stops a new reader from becoming active after we see _active_readers go to zero?

Thanks.

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Marked as reviewed by dholmes (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9225