[issue6394] getppid support in os module on Windows

[Jon Anglin]

Jon Anglin <janglin at fortresgrand.com> added the comment:

Just some information, on Windows:
- process ids are re-used.
- parent process id is set at process creation time and never updated.
(Windows Internal 4th Ed. by Russinovich and Solomon).

Thus, I would say that a long running process can not rely on the value 
of its parent process id.  The parent may not be running, or the process 
id may have been re-used and the process with that id may not be in fact 
the actual parent.  Having said that, I don't know the algorithm that 
Windows uses for process ids, so collisions may be rare (or not).

-Do these same issues exist on Unix systems?

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<http://bugs.python.org/issue6394>
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