> Antoine Pitrou <pitrou@free.fr> added the comment:
> > Would you prefer to not define the function instead of writing a pseudo-
> > atomic function?
> 
> Your current implementation is useless, since it doesn't achieve anything
> new. Besides, if the function isn't atomic, don't name it atomic_XXX.

Someone may reimplement it with unlink+rename which is worse :-)

But ok, you prefer to not define the function if no real atomic implementation 
can be written.