RFR: 8295792: Clean up old async close code

[Daniel Jeliński]

On Fri, 21 Oct 2022 16:04:24 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> Please review this PR that removes the remains of old fdTable-based socket close synchronization.
>> 
>> Verified that tier1-3 tests continue to pass on Linux, MacOS and Windows. Did not verify AIX.
>> 
>> Also removed one slow test for an issue in fdtable implementation; as far as I could tell, it is no longer relevant.
>
> src/java.base/unix/native/libnet/net_util_md.c line 703:
> 
>> 701: 
>> 702:         errno = 0;
>> 703:         read_rv = poll(&pfd, 1, nanoTimeout / NET_NSEC_PER_MSEC);
> 
> I suspect this one will need to handle EINTR like the original code.

as far as I can tell, this method retries all poll failures regardless of errno until timeout expires; NET_Poll retried EINTR, so I think we're good here. Or am I missing something?

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PR: https://git.openjdk.org/jdk/pull/10816