[issue2122] mmap.flush does not check for errors on windows

[Ralf Schmitt]

Ralf Schmitt <schmir at gmail.com> added the comment:

attached is a patch. I hope it is ok to change the semantics a bit. 
They were very strange:
- on unix it raises an exception on errors. otherwise it always returns 0.
- on windows it returns non-zero on success, and returns zero on errors.

Now, flush returns None or raises an Exception.

Added file: http://bugs.python.org/file9645/mmap-flush.txt

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