> > > I can handle it if there is a case where both fail, but is
> there a
> > > case where both can SUCCEED ??
> >
> > What do you mean 'both succeed'?
>
> My understanding is that, on non-broken filesystems, calls to
> mkdir(2) either succeed by creating a new directory, or fail and return
> EEXIST (note: excluding all other types of errors :-))
>
> However, NFS seems to have issues, so the question is: could both
> mkdir(2) calls actually succeed and claim to have created the same
> directory (even if it is?), or is one ALWAYS guaranteed to fail, as on
> a normal fs.
You're implying that you are making two calls to create the same
directory. Am I correct?
The answer is 'maybe'? Depends on the remote NFS server. Matt or one
of the other NFS gurus may know more, but I wouldn't count on *anything*
over NFS. If you need atomicity, you need lockd, which isn't
implemented on FreeBSD.
Nate
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