[issue4944] os.fsync() doesn't work as expect in Windows

[Gabriel Genellina]

Gabriel Genellina <gagsl-py2 at yahoo.com.ar> added the comment:

Thanks for adapting the smaller example. I think I figured out what's 
the problem.

The error reported by checkfile.c is 0x20 = ERROR_SHARING_VIOLATION
"The process cannot access the file because it is being used by 
another process."

I modified the subprocess call, adding the parameter close_fds=True -- 
and now I see no errors. 
Please do a similar change in your application and see if it works.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4944>
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