Aucbvax.4739
fa.unix-wizards
utzoo!decvax!ucbvax!unix-wizards
Tue Oct 27 23:35:04 1981

>From CSVAX.rob@Berkeley Tue Oct 27 22:33:43 1981
If you want an atomic operation for locking, try REMOVING
a file instead of creating it.  Then, when you're done, recreate it.
If you ask to unlink the file and get an OK status, the resource is yours.