RFR: 8297495: j.u.concurrent updates for JDK 20 [v2]

[Alan Bateman]

On Mon, 5 Dec 2022 10:16:22 GMT, Viktor Klang <duke at openjdk.org> wrote:

>> Alan Bateman 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 six additional commits since the last revision:
>> 
>>  - Expand test
>>  - Adjust wording to make it clear that the number of tasks is non-negative
>>  - Merge
>>  - Improve javadoc
>>  - Merge
>>  - Initial commit
>
> src/java.base/share/classes/java/util/concurrent/ForkJoinPool.java line 2920:
> 
>> 2918:      * @since 20
>> 2919:      */
>> 2920:     public <T> ForkJoinTask<T> externalSubmit(ForkJoinTask<T> task) {
> 
> @AlanBateman Does it make sense to check the nullness of the `task` before going into the storeStoreFence etc?

It's only to be the same as poolSubmit.

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PR: https://git.openjdk.org/jdk/pull/11319