New candidate JEP: 499: Structured Concurrency (Fourth Preview)

[Mark Reinhold]

https://openjdk.org/jeps/499

  Summary: Simplify concurrent programming by introducing an API for
  structured concurrency.  Structured concurrency treats groups of
  related tasks running in different threads as a single unit of work,
  thereby streamlining error handling and cancellation, improving
  reliability, and enhancing observability.  This is a preview API.

- Mark