RFR: 7902982: jcstress: Add samples for some mutex algorithms [v3]

[Vladimir Sitnikov]

On Tue, 29 Jun 2021 13:43:48 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> I added a sample with an atomic boolean. However, all samples use busy waiting so far.
>> Do you wish to add samples which get blocked instead of  busy waiting?
>
> Yes, do `synchronized` example too, please, @mmirwaldt-openjdk.

In my opinion, half of the story here is to teach the readers, so if you write a trivial `synchronized(lock) { ... } `, then it would be way easier to understand what Dekker algorithm really means.

I think adding blocking primitives here is OK.

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PR: https://git.openjdk.java.net/jcstress/pull/85