RFR: 8331008: Implement JEP 478: Key Derivation Function API (Preview) [v10]

[Kevin Driver]

On Fri, 6 Sep 2024 14:06:08 GMT, Viktor Klang <vklang at openjdk.org> wrote:

>> My understanding is that `volatile` is used when accessing the contents of the object, which we are not doing with this locking object, so IMO there is no reason for the keyword to be added.
>> 
>> I'll apply your other suggestion about explicit comments.
>
> If the lock is used for double-checked locking the member which is lazily initialized needs `volatile` if the instance is not completely immutable.

@viktorklang-ora: I added additional comments on the lock Object to clarify the purpose of the lock. See: https://github.com/openjdk/jdk/pull/20301/commits/dc0bd1552ea14adaec4cc8e67d4213826c1b175c.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20301#discussion_r1752651175