[bug] sun.nio.ch.PipeImpl uses local TCP/IP connections

[Matthias-Christian Ott]

Expected behaviour:

sun.nio.ch.PipeImpl uses anonymous pipes, i.e. CreatePipe and related
functions, to create pipes on Microsoft Windows.

Actual behaviour:

sun.nio.ch.PipeImpl loopback TCP/IP connections to create pipes.
Therefore the number of pipes is less or equal to the size of the
dynamic port range and due to RFC 6335 limited to a maximum of 8191
pipes (two ports per pipe) for the entire system (not accounting for any
other uses of the ports).

Modern computers can handle more threads than this limit if the threads
use selectors or pipes, the limit of pipes is also the limit of threads
and selectors of the entire system.

Suggested fix:

sun.nio.ch.PipeImpl should use anonymous pipe. It seems that supported
versions of Microsoft Windows can create millions of handles and is not
limited to the dynamic port range.