RFR: JDK-8310066: Improve test coverage for JVMTI GetThreadState on carrier and mounted vthread [v3]

[Serguei Spitsyn]

On Thu, 29 Jun 2023 04:41:20 GMT, Alex Menkov <amenkov at openjdk.org> wrote:

>> This is follow-up JDK-8307153/JDK-8309612 (JVMTI GetThreadState on carrier should return STATE_WAITING)
>> New test tests GetThreadState for different thread states.
>> The test detected a bug in the implementation, new issue is created: JDK-8310584
>> Corresponding testcases are commented now in the test, fix for JDK-8310584 will uncomment them
>
> Alex Menkov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   spurious wakeups

test/hotspot/jtreg/serviceability/jvmti/vthread/GetThreadStateMountedTest/GetThreadStateMountedTest.java line 62:

> 60:         TestStatus status = new TestStatus("JVMTI_THREAD_STATE_RUNNABLE");
> 61:         CountDownLatch ready = new CountDownLatch(1);
> 62:         final boolean[] stopFlag = new boolean[1];

Q: It is not clear why an array is needed instead of non-final local. The same question for `waiting()` method below.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14622#discussion_r1246698740