RFR: CODETOOLS-7903022: jcstress: Mutex_06_Semaphore sample

[Michael Mirwaldt]

On Mon, 6 Sep 2021 15:22:45 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> I think Mutex_06_Semaphore is missing because many concurrent algorithms use semaphores as mutexes.
>
> Looks fine.

What's next, at shipilev? Integrate?

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PR: https://git.openjdk.java.net/jcstress/pull/95