RFR: 8312174: missing JVMTI events from vthreads parked during JVMTI attach [v2]

[Leonid Mesnik]

On Fri, 8 Sep 2023 23:28:01 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

>> Would it makes sense also to check that thread state is TIMED_WAITING. It should be set  TIMED_WAITING unmounted threads https://docs.oracle.com/en/java/javase/20/docs/api/java.base/java/lang/Thread.State.html#TIMED_WAITING
>
> It is strange that the the tested vthreads in sleep(timeout) have sate WAITING, not TIMED_WAITING.
> It can be a bug in the implementation.
> I've decided to add a short sleep. Checking states looks a little bit over complicated.

Could you please also add comment with sleep which describe why is it needed and mention that the insufficient sleep time couldn't cause test failures. Test should pass anyway just don't test expected state.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15467#discussion_r1320620378