RFR: 8319447: Improve performance of delayed task handling [v13]

[Alan Bateman]

On Wed, 26 Mar 2025 13:11:40 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 pull request now contains 49 commits:
>> 
>>  - Merge branch 'openjdk:master' into JDK-8319447
>>  - Address review comments
>>  - 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)
>>  - ... and 39 more: https://git.openjdk.org/jdk/compare/dbc620fb...4aabe6b0
>
> src/java.base/share/classes/java/util/concurrent/ForkJoinPool.java line 3743:
> 
>> 3741:      * @since 25
>> 3742:      */
>> 3743:     public void cancelDelayedTasksOnShutdown() {
> 
> @DougLea Should this really be possible to enable for the common pool? (Because different parts of an application using commonPool() could have conflicting requirements)

The commonPool can't be shutdown (both shutdown methods are specified to have no effect on the common pool) so I suppose it doesn't really matter.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23702#discussion_r2014119265