RFR: 8293696: java/nio/channels/DatagramChannel/SelectWhenRefused.java fails with "Unexpected wakeup" [v4]

[Alan Bateman]

On Tue, 1 Nov 2022 16:20:32 GMT, Darragh Clarke <duke at openjdk.org> wrote:

>> Added logging to SelectWhenRefused for an intermittent failure caused by unexpected wakeups, this includes trying to receive data if there is any available to identify where it is coming from.
>> 
>> I also set the test to run in othervm mode which should reduce the chances of this failure happening in the first place.
>
> Darragh Clarke has updated the pull request incrementally with one additional commit since the last revision:
> 
>   addressing comments

test/jdk/java/nio/channels/DatagramChannel/SelectWhenRefused.java line 136:

> 134:     }
> 135: 
> 136:     static boolean checkUnexpectedWakeup(DatagramChannel dc, Set<SelectionKey> selectedKeys) {

For the next iteration, would you mind dropping the selectedKeys parameter from this method. It doesn't make sense to be calling dc.receive in this loop. It would be a lot simpler to do the non-blocking dc.receive and print the sender/details when not null.

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PR: https://git.openjdk.org/jdk/pull/10851