Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!rutgers!netsys!macomh!macom1!larry
From: larry@macom1.UUCP (Larry Taborek)
Newsgroups: comp.databases
Subject: Re: Concurrency control in real life
Message-ID: <4875@macom1.UUCP>
Date: 2 Aug 89 11:40:04 GMT
References: <322@csense.UUCP>
Organization: CENTEL Federal Systems, Reston, VA. 22091-1506
Lines: 35

From article <322@csense.UUCP>, by bote@csense.UUCP (John Boteler):
> In order for my brain to learn most effectively, it needs an
> analogy:
> 
> I request that someone post a solid example of an instance
> where concurrency is a problem to control, perhaps with
> a discussion of concurrency issues relating to the example.
> 
Humm, thats a good one.

How about sibblings fighting over a toy.

"Its my turn."  Sibbling A
"No its mine."  Sibbling B
"Its mine."  Sibbling A
"Mine"  Sibbling B

Adults emulate concurrency through ques (waiting in line at a
bank, imagine everyone trying to do their transaction at the same
time at a common teller), and through round robin scheduling
("Next please!").

People in the real world don't deal with concurrency like a
computer because its so obvious.  If your at a rental company and
all their (cars,rv's,boats,whatever) are gone and the lots empty,
then off you go to another rental company or give up.

Hope this helps...

Larry
-- 
Larry Taborek	..!uunet!grebyn!macom1!larry	Centel Federal Systems
		larry@macom1.UUCP		11400 Commerce Park Drive
						Reston, VA 22091-1506
						703-758-7000