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

[Alan Bateman]

On Wed, 9 Apr 2025 08:03:44 GMT, Viktor Klang <vklang at openjdk.org> wrote:

>> It already does, no CAS if the current value is the new value.
>
> I meant the park permit. :)

getAndSetParkPermit isn't changed in this PR. If the park permit is already granted then getAndSetParkPermit(true) doesn't do anything. More generally, parkTimeoutExpired is just a reduced unpark, only added so that we can do a lazy rather than internal submit for the less common case that the timeout expires.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24030#discussion_r2034760820