RFR (S): 8223736:jvmti/scenarios/contention/TC04/tc04t001/TestDescription.java fails due to wrong number of MonitorContendedEntered events

[serguei.spitsyn at oracle.com]

Sorry, forgot the  bug title to add to the email subject.

Thanks,
Serguei

On 6/19/19 6:09 PM, serguei.spitsyn at oracle.com wrote:
> Please review a fix for test bug:
>   https://bugs.openjdk.java.net/browse/JDK-8223736
>
> Webrev:
> http://cr.openjdk.java.net/~sspitsyn/webrevs/2019/8223736-mon-events-test.1/ 
>
>
> Summary:
>  It seems that waiting for 0.5 sec for a MonitorContendedEnter event 
> in the
>  increment() method sometime is not enough (especially when the JFR is 
> enabled).
>  The fix implement an approach to ensure the event has posted before 
> the worker
>  thread goes to the next iteration.
>  Also, another check is added to diagnose if any of two worker threads
>  (tc04t001Thread) has been interrupted by timeout.
>  In fact, we have many other tests which miss this kind of check and 
> diagnostics.
>  We may want to consider fixing other cases if we encounter this 
> eventually happens.
>
> Testing:
>  A mach5 test submission is in progress.
>
> Thanks,
> Serguei
>