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From: phipps@fortune.UUCP (Clay Phipps)
Newsgroups: net.micro,net.research,net.cse
Subject: P and V / Re: Should Universities Explore... Re: 'toy OS'
Message-ID: <3107@fortune.UUCP>
Date: Thu, 19-Apr-84 17:49:34 EST
Article-I.D.: fortune.3107
Posted: Thu Apr 19 17:49:34 1984
Date-Received: Fri, 20-Apr-84 01:55:40 EST
References: <858@omsvax.UUCP>
Organization: Fortune Systems, Redwood City, CA
Lines: 17

Semaphores, the "P" and "V" operations on them
(corresponding to waiting andd signaling, repectively), in addition to
"mutual exclusion", the "critical region", and "the deadly embrace",
should be attributed to Edsger W. Dijkstra, not Per Brinch Hansen.

One reference is 

    E. W. Dijkstra: "Hierarchical Ordering Of Sequential Processes",
    in G. Goos, ed.: *Operating Systems Techniques*, pp. 72 .. 93.
    or in *International Seminar on Operating Systems Principles*,
    Belfast, 1971.

-- Clay Phipps

-- 
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