file locking primitive
andreas.raab at gmx.de
Sat Jan 3 17:24:46 UTC 2004
> I reviewed some previous email (on and off list), and here are some
> helpful clippings:
> >From Todd Blanchard:
> On Friday, March 14, 2003, at 11:10 AM, Cees de Groot wrote:
> > Now, I want to enhance the file plugin with a locking primitive. Are
> > the posix lockf() semantics available on all the platforms?
> Definitely not on Windows. You will need to come up with a different
> lock strategy not dependent on the file system. I ran into this while
> trying to use file locks to sync separate java processes. There is no
> atomic createAndLockFile on Windows.
This statement seems wrong from what I can tell. Both CreateFile
(http://msdn.microsoft.com/library/en-us/fileio/base/createfile.asp) as well
various ways of locking files. Whether those are supported on all of the
various file systems is a different matter but one that cannot be possibly
addressed by such a primitive.
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