RFR: Use timed wait to sleep control thread [v2]

Thu Apr 8 16:36:55 UTC 2021

On Thu, 8 Apr 2021 06:26:54 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> earthling-amzn has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Increase mutex rank of gc waiters
>>    
>>    This lets us take the control thread's lock to notify it without tripping the deadlock detector.
>>  - Remove unnecessary enum namespace
>
> OK then, with one minor stylistic nit.

Good to go.

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PR: https://git.openjdk.java.net/shenandoah/pull/28