RFR: 8319447: Improve performance of delayed task handling [v12]

[Doug Lea]

On Tue, 25 Mar 2025 15:14:56 GMT, Viktor Klang <vklang at openjdk.org> wrote:

>> Doug Lea has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 47 additional commits since the last revision:
>> 
>>  - Merge branch 'openjdk:master' into JDK-8319447
>>  - Match indent of naster changes
>>  - Use TC_MASK in accord with https://bugs.openjdk.org/browse/JDK-8330017 (Unnecessarily for now.)
>>  - Reword javadoc
>>  - Use SharedSecrets for ThreadLocalRandomProbe; other tweaks
>>  - Disambiguate caller-runs vs Interruptible
>>  - Merge branch 'openjdk:master' into JDK-8319447
>>  - Associate probes with carriers if Virtual (no doc updates yet)
>>  - Reduce volatile reads
>>  - Address review comments; reactivation tweak
>>  - ... and 37 more: https://git.openjdk.org/jdk/compare/fd6e7e14...b552c225
>
> src/java.base/share/classes/java/util/concurrent/DelayScheduler.java line 434:
> 
>> 432:         if (n > 0)
>> 433:             cancelAll(h, n);
>> 434:         for (ScheduledForkJoinTask<?> a = (ScheduledForkJoinTask<?>)
> 
> @DougLea Is there any risk here for a late writer to PENDING to append *after* this loop completes?

No. Pool status is already STOP at this point, so no new requests will appear.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23702#discussion_r2012733609