On Thu, 18 Feb 2010, Greg Aiken wrote:
> 
> other things to experiment with;
> 
> a. if the file may be successfully renamed, this implies its not being held
> open (clunky solution, as would require you to rename once, then again to
> bring it back to its original filename - but low tech), or

This is not correct.  You can rename a file that is in use (you cannot delete
it when it is in use, but that doesn't help you much here).  Trying to open
the file for updating is a much simpler test to make sure nobody holds the
file open for writing.

Cheers,
-Jan

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