If you can be 100% sure that there will never be a chance that a single client will trigger more than one thread, then you are right. But ...
* Frames * Users hitting refresh on a page before it finishes processing * Retry attempts All of those, and more, can indeed cause a situation where there is more than one active thread per session. But having said that, you are right. This is obviously a much bigger potential problem for APPLICATION or SERVER. Except for the fact that SESSION is likely used and updated more, so it may be a bigger problem for SESSION after all. :-) --- Ben -----Original Message----- From: Bud [mailto:webcreation@;mindspring.com] Sent: Friday, November 01, 2002 1:46 PM To: CF-Talk Subject: RE: Understanding Locking In CFMX On 11/1/02, Ben Forta penned: >Any application or development language that allows multiple threads to >access shared data has to deal with it - operating systems do, as do >DBMSs, as do development languages. It is not a CF issue at all. Well, assuming that something like a shopping cart is stored in a session variable. Each session should be unique to the user, correct? So unless a user has 2 windows opens and clicks View Cart simultaneously in one window while clicking Update Cart in the other, there shouldn't be a problem, should there? Or without locking, is there a chance ColdFusion could read the variable while it's still being written. Example: 1. <cfset temp = QuerySetCell(session.cart, "quantity", #form.quantity#, 1)> 2. There are <cfoutput>#session.cart.quantity#</cfoutput> items in your cart. Could Step 2 process before step 1 is finished? I didn't think it could. That's one reason I could never understand why session locking was needed. Application and server variables I understand. -- Bud Schneehagen - Tropical Web Creations _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ ColdFusion Solutions / eCommerce Development [EMAIL PROTECTED] http://www.twcreations.com/ 954.721.3452 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| 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 This list and all House of Fusion resources hosted by CFHosting.com. The place for dependable ColdFusion Hosting.
