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

[Michael Mirwaldt]

On Tue, 29 Jun 2021 13:14:13 GMT, Vladimir Sitnikov <vsitnikov at openjdk.org> wrote:

>> That's funny because I had comments like "critical section starts" and "critical section ends" in one version but I removed them because I thought you and Aleksey would consider them "noise". I will put them into the code again.
>
> It might be fun to use code block like
> 
> 
>     /* critical_section */ {
>         taken1 = true;
>         r.r1 = taken2;
>         taken1 = false;
>     }

What about this?
        taken1 = true; // critical section starts
        r.r1 = taken2;
        taken1 = false; // critical section ends

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