RFR: 8311867: StructuredTaskScope.shutdown does not interrupt newly started threads

[Jaikiran Pai]

On Tue, 11 Jul 2023 17:03:26 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> StructuredTaskScope.shutdown can sometimes not interrupt the thread for a newly forked subtask, leading to join blocking until subtask completes. The "hang" can be duplicated with a stress test that shuts down the scope while a long running subtask is being forked. The bug is in the underlying thread flock code where it filters the threads to just the live threads and so filters out new/unstarted threads, that filtering was left over from some refactoring in the loom repo a long time ago and should have been removed.

Marked as reviewed by jpai (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/14833#pullrequestreview-1526191301