8351927: Change VirtualThread implementation to use use FJP delayed task handling

[AlanBateman]

Follow up to JDK-8319447 to change the VirtualThread implementation to use FJP's delayed task handling.

The SPTE based implementation is not removed. It will continue to be used by tests. If custom schedulers are exposed in the future then they will use this implementation.

For timed-Object.wait, waitTimeoutExpired is changed to use lazySubmit to avoid signalling and increase the chance that the unparked virtual thread will continue on the current carrier. For timed-park, the timeout task is changed to reduced form of unpark that also uses lazySubmit, for the same reason.

jcmd Thread.vthread_scheduler is changed to no longer print the delay schedulers. Instead, the delayed task count will appear in the default scheduler output.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
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Issue

• JDK-8351927: Change VirtualThread implementation to use use FJP delayed task handling (Enhancement - P4)

Reviewers

• Viktor Klang (@viktorklang-ora - Reviewer)

Reviewing

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$ git pull https://git.openjdk.org/jdk.git pull/24030/head

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• 00: Full (30eba776)

[AlanBateman]

/integrate

[openjdk]

Going to push as commit 6c93ad4.
Since your change was applied there have been 59 commits pushed to the master branch:

• 7aeaa3c: 8187520: Add --disable-java-warnings-as-errors configure option
• cd9fa3f: 8353439: Shell grouping of -XX:OnError= commands is surprising
• a1d566c: 8348853: Fold layout helper check for objects implementing non-array interfaces
• ... and 56 more: https://git.openjdk.org/jdk/compare/867a0301893cbf3d5434e4966d27d7f4913afb98...master

Your commit was automatically rebased without conflicts.

[openjdk]

@AlanBateman Pushed as commit 6c93ad4.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.