RFR: 8291714: Implement a Multi-Reader Single-Writer mutex for Hotspot [v3]

[Coleen Phillimore]

On Thu, 25 Aug 2022 10:07:05 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> Johan Sjölén has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Update documentation
>>  - Fix outdated headers and remove dead code
>
> I don't have time to review, just chiming in that I look forward to use RWL in NMT, to simplify the lockless MST.

@tstuefe I have a memory of there being a lock like this in NMT, but it must have been removed.

If there's an upcoming use of this RWL lock, then we should integrate it first and not bundle it with the client code.

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PR: https://git.openjdk.org/jdk/pull/9838