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Aucbvax.2716 fa.unix-wizards utzoo!decvax!ucbvax!unix-wizards Tue Aug 18 01:56:50 1981 Re: links and lox >From CSL.JLH.MOGUL@SU-SCORE Mon Aug 17 22:42:45 1981 I have found that a simple modification to the "file-as-lock" method can avoid some of the hassles of crashed programs.

We have a printer spooler that is similar to lpd. It uses the same locking code, except that a lock is broken if it has been modified more that some timeout period ago (e.g., 10 minutes). Also, the spooler detects if some other spooler is running by seeing whether the file was modified more recently than it did itself. This may lead to an occasional multiple-copy, but does avoid the persistant locks left around by crashed spoolers.

Our version of lpq knows about this lock timeout and will start a new spooler if the lock is too old. -Jeff -------

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