mkdir can fail atomicity if non-local storage is involved: http://www.mail-archive.com/freebsd-hackers@freebsd.org/msg20436.html http://www.mail-archive.com/fre

mkdir can fail atomicity if non-local storage is involved: http://www.mail-archive.com/freebsd-hackers@freebsd.org/msg20436.html http://www.mail-archive.com/freebsd-hackers@freebsd.org/msg2... I still use it for the quick-and-dirty lockfile case despite this.