Backporting Keepalive Windows Extended Socket Options (JDK-8308593) to 11u and 17u

[Terry Chow (Simba Technologies Inc)]

Hi maintainers of OpenJDK updates,

I'd like to backport JDK-8308593<https://bugs.openjdk.org/browse/JDK-8308593> (keepalive extended socket options for Windows) to 11u and 17u (maybe 8u later as well). And so, I just want to open discussion on this topic to hear your opinions before I start the backporting process. I did some initial investigation on the backport and I learned the following:

Backporting to 11u requires three additional changes to be made on top of the backport in order for it to work.

  1.  Lib-jdk.net.gmk will need to be updated to support building extnet for Windows.
  2.  jdk.net.ExtendedSocketOption will need to add a case to support returning a Windows instance of PlatformSocketOptions.
  3.  The Windows PlainSocketImpl class needs to have the same code on lines 61 - 96 in the Unix PlainSocketImpl class.

Backporting to 17u requires two additional changes (similar to 11u).

  1.  jdk.net/Lib.gmk will need to be updated to support building extnet for Windows.
  2.  jdk.net.ExtendedSocketOption will need to add a case to support returning a Windows instance of PlatformSocketOptions.

Let me know if the additional changes are acceptable or if they're disruptive.

Thanks,
Terry
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