RFR: 8306647: Implementation of Structured Concurrency (Preview)

[Andrey Turbanov]

On Thu, 11 May 2023 13:08:55 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> This is the implementation of:
> 
> - JEP 453: Structured Concurrency (Preview)
> - JEP 446: Scoped Values (Preview)
> 
> For the most part, this is just moving code and tests.  StructuredTaskScope moves to j.u.concurrent as a preview API, ScopedValue moves to j.lang as a preview API, and module jdk.incubator.concurrent has been removed. The significant API changes since incubator are:
> 
> - StructuredTaskScope.fork returns Subtask instead of Future (JEP 453 has a section on this)
> - ScopedValue.where methods are replaced with runWhere, callWhere and getWhere

test/jdk/java/util/concurrent/StructuredTaskScope/StructuredTaskScopeTest.java line 1016:

> 1014:             scope.join();
> 1015: 
> 1016:             var subtask1  = scope.find(task1);

Suggestion:

            var subtask1 = scope.find(task1);

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PR Review Comment: https://git.openjdk.org/jdk/pull/13932#discussion_r1204557338