RFR: 7902982: jcstress: Add samples for some mutex algorithms [v10]

[Aleksey Shipilev]

On Tue, 29 Jun 2021 15:50:13 GMT, mmirwaldt for openjdk <github.com+86246875+mmirwaldt-openjdk at openjdk.org> wrote:

>> jcstress-samples/src/main/java/org/openjdk/jcstress/samples/concurreny/mutex/Mutex_03_AtomicBoolean.java line 53:
>> 
>>> 51:     @Actor
>>> 52:     public void actor1(II_Result r) {
>>> 53:         while(taken.get() || !taken.compareAndSet(false, true)); // spin
>> 
>> Suggestion:
>> 
>>         while(!taken.compareAndSet(false, true)) {
>>             // wait for entering into the critical section
>>         }
>> 
>> 
>> I think `taken.get()` is not needed here, and adding explicit braces makes it easier to understand that the braces for "critical section" are different ones.
>
> Well, @shipilev proposed it. I cannot find his comment.

This is TTAS, it is OK in this form.

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