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nformation in this thread that mkdir is in fact atomic
I don't believe that atomicity of mkdir was ever in doubt as far as local filesystems are concerned.
The question, I thought, was about whether it remained atomic for NFS mounted directories.
My point in posting was -- on ancient HP/UX, where mkdir was tested and found atomic on NFS-mounted drives -- not just that that simple form of loop was sufficient to obtain a unique directory, but actually that it is far more likely to be reliable than the two-stage mechanisms that create files first, then directories.
Tendered with the clear caveat of the ancient state of my knowledge, I fail to see that creating a file -- just another name in the directory space -- is any more likely to be atomic than creating a directory.
But ... that is based on logic alone; not current, OS-specific knowledge.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
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