8264851: Shenandoah: Rework control loop mechanics to use timed waits

[earthling-amzn]

We use a similar mechanism in shGenerationalControlThread already. Using a timed wait allows the control thread to be woken up before the wait expires.

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Issue

• JDK-8264851: Shenandoah: Rework control loop mechanics to use timed waits (Enhancement - P4)

Reviewers

• Kelvin Nilsen (@kdnilsen - Committer)
• Aleksey Shipilev (@shipilev - Reviewer)

Reviewing

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[openjdk]

@earthling-amzn This change now passes all automated pre-integration checks.

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8264851: Shenandoah: Rework control loop mechanics to use timed waits

Reviewed-by: kdnilsen, shade

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[openjdk]

@earthling-amzn The following labels will be automatically applied to this pull request:

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[mlbridge]

Webrevs

• 01: Full - Incremental (fd47d57f)
• 00: Full (73c1849a)

[earthling-amzn]

/integrate

[openjdk]

Going to push as commit 92f2ab2.

[openjdk]

@earthling-amzn Pushed as commit 92f2ab2.

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