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

[Michael Mirwaldt]

On Tue, 29 Jun 2021 13:16:14 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 49:
>> 
>>> 47:  */
>>> 48: @JCStressTest
>>> 49: @Outcome(id = {"false, false"}, expect = ACCEPTABLE, desc = "Both actors have entered the critical section one after another")
>> 
>> What do you think of `Each actor observes another one as 'outside of the critical section'`?
>> 
>> It would help if you could add a comment describing what the outcome really means.
>> It looks like every actor records if it observes another actor in the same critical section, however, that is not really clear from the code ��
>
> Yes, you are right. I must confess that I had to think about 30min why Aleksey's solution work. His solution is clever.
> Then I tried to explain it in comments but I failed. I will try it again.

I have added a comment now to Mutex_01_NoAlgorithm . I hope users understand my explaination.
If you like to change something in my explaination, just tell me.

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