Aucbvax.2742
fa.unix-wizards
utzoo!decvax!ucbvax!unix-wizards
Tue Aug 18 14:16:42 1981
Re: using signal(2) with locks
>From Dave-Yost@RAND-UNIX Tue Aug 18 14:09:23 1981

Here's the race condition.  Consider processes A & B:
   A: determine that lock file is dead
   B: determine that lock file is dead
   A: unlink lock file
   A: link to lock file
   B: unlink lock file
   B: link to lock file

Now each of them thinks he has a valid lock.

--dave


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