I didn't consider rename, because rename says:

... it will usually not work across file system boundaries, even though the system mv command sometimes compensates for this.

As for atomicity, I wonder how Perl could guarantee that, without assumption of the file system being used. Unfortunately I don't know enough about Samba, CIFS and NFS, to know what they offer for atomic rename. May I ask you where you got the information that rename is atomic?
-- 
Ronald Fischer <ynnor@mm.st>

In reply to Re^4: locking over the network (rename) by rovf
in thread locking over the network by rovf

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