lol! not again u ok there tony?
----- Original Message ----- From: "Ben Doom" <[EMAIL PROTECTED]> To: "CF-Talk" <[EMAIL PROTECTED]> Sent: Tuesday, February 11, 2003 3:47 PM Subject: RE: CFLOCK > Author's note. This is not meant to be patronizing or anything. It's kind > of an oversimplification, but it's intended to help you (and anyone else who > wants to read it) visualize the problems. > > Okay. Pretend that data storage is a bunch of bins. Anyone can look at > shared bins, like the session, client, application, and server bins. Anyone > can write to them as well (for the most part). > > Now, let's pretend that you've got a bunch of office workers who use these. > There are two problems associated with sharing all this stuff. > > One: garbling things. Let's pretend that you have a long memo stored in > (what else?) application.memo. Bob the janitor is taking the memo out of > the bin a paragraph at a time (he's a slow reader). Normally, this isn't a > problem. Until Jim the manager starts rewriting the memo and sticks the > paragraphs in the bin while Bob isn't looking.. Unfortunately, Bob & Jim > aren't smart enough to co-ordinate this, so what Bob gets is the first half > of the old memo and the last half of the new memo. So he gets a garbled > memo. > > Two: race conditions. Fred needs to remember something, so he sticks in in > application.something. Unfortunately, Herman needs to remember a slightly > different version, and sticks it in application.something just after Fred > does. Now, when Fred goes to read what he put there, he gets Herman's > version. > > Okay, now we have CFLOCK. It's like a note on the front of the bin. If > it's a readonly lock, it says "You can read this, but don't change it until > I remove the note." If it's an exclusive lock, it says "I'm using this, > wait your turn!" > > > > HTH. > > > -- Ben Doom > Programmer & General Lackey > Moonbow Software, Inc > > : -----Original Message----- > : From: Scott Wilhelm [mailto:[EMAIL PROTECTED]] > : Sent: Tuesday, February 11, 2003 3:17 PM > : To: CF-Talk > : Subject: CFLOCK > : > : > : Can someone please explain to me, in very simply terms, what CFLOCK > : does, and why/when/where I should use it? > : > : I'm trying to build an application, and put it together as proper as can > : be, but for some reason, my brain doesn't want to comprehen CFLOCK. > : > : Thanks, > : > : Scott > : > : > : Scott Wilhelm > : Computer Technician/Web Developer > : St. Lawrence-Lewis BOCES > : PO Box 231, Outer State Street > : Canton, NY 13617 > : > : P. 315-386-4504 x 164 > : F. 315-386-3395 > : W. http://www.sllboces.org > : E. [EMAIL PROTECTED] > : > : > : > : > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/cf_lists/index.cfm?method=subscribe&forumid=4 FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Signup for the Fusion Authority news alert and keep up with the latest news in ColdFusion and related topics. http://www.fusionauthority.com/signup.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
