RFR: 8243455: Many SA tests can fail due to trying to get the stack trace of an active method

[Yasumasa Suenaga]

On Tue, 9 Mar 2021 06:42:51 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

>> Ok, that's easy enough. What about the loop before it. Do you prefer 100ms sleeps or onSpinWait() for it also.
>
> I prefer `onSpinWait()` if anything because it expects short suspend, and we can expect CPU friendly code.

As an option, we can remove `steadyStateReached` and rewrite the code as following:

        steadyStateThread.setName("SteadyStateThread");
        steadyStateThread.start();

        while (steadyStateThread.getState() != Thread.State.BLOCKED) {
            Thread.onSpinWait();
        }

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PR: https://git.openjdk.java.net/jdk/pull/2700