RFR: 8287580: (se) CancelledKeyException during channel registration [v3]

[Alan Bateman]

On Thu, 9 Jun 2022 15:11:51 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Either that or go with the `KeyCancelled` test for now and file a separate issue to fix / replace that.

I looked at the CancelDuringRegister test again. Two threads are racing toe cancel the key. The winner queues the cancelled key to be flushed from the Selector at the next selection operation. If the winner is the background thread spinning on `sel.keys().forEach(SelectionKey::cancel);` then there is no guarantee that the cancelled key has been removed from the Selector's key set before the next register. So that is why it register fails intermittently with CancelledKeyException. The test can be fixed by changing it to call selectNow until the key is removed.

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PR: https://git.openjdk.org/jdk/pull/8978