RFR: 8286597: Implement PollerProvider on AIX [v2]

[Tyler Steele]

On Mon, 8 May 2023 17:17:36 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> I believe we get [here](https://github.com/openjdk/jdk/blob/master/src/java.base/unix/native/libnio/ch/SocketDispatcher.c#L44) with EAGAIN, but not ECONNRESET. So the -1 indicates that the read has failed.
>> 
>> My feeling is that the defined behaviour is not totally clear. [From setSockOpt](https://linux.die.net/man/3/setsockopt) (emphasis added by me):
>> 
>>> SO_LINGER
>>>   Lingers on a close() _if data is present_.
>> 
>> This does not define what happens if no data is present. In my testing, AIX behaved exactly like it does in `testSocketReadPeerClose1` so my understanding is that SO_LINGER had essentially no effect because there is no data waiting to be sent. As I see it, this test reduces to `testSocketReadPeerClose1` on AIX, so the test should be the same. Another option would be to skip it entirely on AIX.
>
> There are several tests in both the java/net and java/nio/channels tree that setup the conditions for a "hard reset", e.g. SocketChannel/ConnectionReset.java. I'm curious if these tests also fail on AIX.

Thanks for mentioning it. I'll take a look at those to see if they also fail.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13452#discussion_r1187693273