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

[Doug Lea]

On Tue, 25 Mar 2025 16:41:41 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/95474107...b552c225
>
> test/jdk/java/util/concurrent/tck/ForkJoinPool20Test.java line 458:
> 
>> 456:                         }
>> 457:                         previous.set(now);
>> 458:                         done.countDown();
> 
> Should we test so that we don't count down below 0?

Sure. Added
     assertTrue(done.getCount() > 0);
before
                        done.countDown();

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PR Review Comment: https://git.openjdk.org/jdk/pull/23702#discussion_r2012772294