8342486: Implement JEP draft: Structured Concurrency (Fourth Preview)

[AlanBateman]

Work in progress.

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change requires CSR request JDK-8342487 to be approved

Issues

• JDK-8342486: Implement JEP draft: Structured Concurrency (Fourth Preview) (Enhancement - P3)
• JDK-8342487: Implement JEP draft: Structured Concurrency (Fourth Preview) (CSR)

Contributors

• Alan Bateman <[email protected]>
• Viktor Klang <[email protected]>

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/21760/head:pull/21760
$ git checkout pull/21760

Update a local copy of the PR:
$ git checkout pull/21760
$ git pull https://git.openjdk.org/jdk.git pull/21760/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 21760

View PR using the GUI difftool:
$ git pr show -t 21760

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/21760.diff

[bridgekeeper]

👋 Welcome back alanb! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

@AlanBateman The following labels will be automatically applied to this pull request:

• compiler
• core-libs

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing lists. If you would like to change these labels, use the /label pull request command.

[AlanBateman]

/label compiler remove

[openjdk]

@AlanBateman
The label remove is not a valid label.
These labels are valid:

• graal
• serviceability
• hotspot
• hotspot-compiler
• ide-support
• kulla
• i18n
• shenandoah
• jdk
• javadoc
• security
• hotspot-runtime
• jmx
• build
• nio
• client
• core-libs
• compiler
• net
• hotspot-gc
• hotspot-jfr

[AlanBateman]

/label remove compiler

[openjdk]

@AlanBateman
The compiler label was successfully removed.

[AlanBateman]

/contributor add @AlanBateman
/contributor add @viktorklang-ora

[openjdk]

@AlanBateman
Contributor Alan Bateman <[email protected]> successfully added.

[openjdk]

@AlanBateman
Contributor Viktor Klang <[email protected]> successfully added.

[ExE-Boss]

This class can be final given that it only has private constructors.

Suggested change

	public class StructuredTaskScope<T, R> implements AutoCloseable {
	public final class StructuredTaskScope<T, R> implements AutoCloseable {