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

[Vladimir Sitnikov]

On Tue, 29 Jun 2021 13:11:28 GMT, Michael Mirwaldt <github.com+6693355+mmirwaldt at openjdk.org> wrote:

>> jcstress-samples/src/main/java/org/openjdk/jcstress/samples/concurreny/mutex/Mutex_02_PetersonAlgorithm.java line 65:
>> 
>>> 63:         taken1 = true;
>>> 64:         r.r1 = taken2;
>>> 65:         taken1 = false;
>> 
>> What do you think of adding comments that show where the critical section starts and where it ends?
>> It looks like 3 or 8 lines are inside the critical section, so adding begin-end comments would help.
>
> 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;
    }

-------------

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