Move non-blocking code into its own /port file, for code clarity.

Bruce Momjian <bruce@momjian.us>

Commit: 60a068b3897a27cbb1a13a6b050d05a0ca479055
Author: Bruce Momjian <bruce@momjian.us>
Date: 2004-03-10T21:12:49Z
Releases: 8.0.0
Move non-blocking code into its own /port file, for code clarity.

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