JEP 446: Scoped Values (Preview)

[pshipton]

See Scoped Values (Preview)

[pshipton]

@tajila @babsingh @fengxue-IS

[babsingh]

Currently, in JDK20, there is only one failure associated to Scoped Values: #16965; this has been identified as a JIT inliner issue. Will keep monitoring the JEP's state periodically.

[babsingh]

Current tests in JDK20: https://github.com/ibmruntimes/openj9-openjdk-jdk20/tree/openj9/test/jdk/jdk/incubator/concurrent/ScopedValue

Currently, only the StressStackOverflow test is disabled. References:

• JDK20: https://github.com/adoptium/aqa-tests/blob/master/openjdk/excludes/ProblemList_openjdk20-openj9.txt
• JDK21: https://github.com/adoptium/aqa-tests/blob/master/openjdk/excludes/ProblemList_openjdk21-openj9.txt

[babsingh]

Most of the work for scoped values is complete.

The two remaining tasks have individual issues and can be tracked through the Java 21 milestone:

• JDK20 jdk/incubator/concurrent/ScopedValue/StressStackOverflow.java StressStackOverflow$TestFailureException: Unexpected value for ScopedValue #16965
• Implement Thread.findScopedValueBindings() #17402

Closing since this issue is no longer needed.