RFR: 8351458: (ch) Move preClose to UnixDispatcher

[Alan Bateman]

On Tue, 11 Mar 2025 08:45:13 GMT, Michael McMahon <michaelm at openjdk.org> wrote:

> So, on Unix, the fd needs to be dup'ed and the native thread signalled. On Windows, the dup() operation does not happen, but the threads were being signalled previously, but not any more. Was that redundant previously?

There's never been any signalling of threads on Windows, NativeThread::isNativeThread always returns false. So no change on Windows.

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PR Comment: https://git.openjdk.org/jdk/pull/23956#issuecomment-2713194965