I'm guessing that they actually mean "if your variables get hozed as a result of not locking it's happening because of a race condition of your own making". Rather than "data in the shared scopes may be randomly corrupted if not locked". For instance -- if you have a frameset that loads 2 frames and you need to set an application or session var before frame2 loads, but you set it in the template loading in frame1 there's a chance it might not get set until after frame2 loads and thereby frame2 would contain the wrong data -- but not through any fault of the server. This is probably a poor example, but at the moment it's the best I can do. :)
> I interpret that paragraph as "The app server won't dump > core if you don't > lock your shared access, but your variable might get > hosed." So, if you > don't mind your variables possibly getting wasted, then > yes, I'll agree that > locking is optional. > barneyb > --- > Barney Boisvert, Senior Development Engineer > AudienceCentral (formerly PIER System, Inc.) > [EMAIL PROTECTED] > voice : 360.756.8080 x12 > fax : 360.647.5351 > www.audiencecentral.com >> -----Original Message----- >> From: Matthew Walker [mailto:[EMAIL PROTECTED] >> Sent: Tuesday, April 01, 2003 3:27 PM >> To: CF-Talk >> Subject: RE: Is there a trick... >> >> >> Pretty sure. The docs: >> >> While the ColdFusion Server is thread-safe and does not >> try to modify a >> variable simultaneously, it does not ensure the correct >> order of access to >> information. If multiple pages, or multiple invocations >> of a page, attempt >> to write data simultaneously, or read and write it at the >> same time, the >> resulting data can be inconsistent, as illustrated in the >> following Sample >> locking scenarios section. >> >> It doesn't say "thread-safe except if you try to access >> application and >> server scopes". >> >> Yes you still have to lock them. But CFMX does it >> automatically, so you >> don't have to do it explicitly. >> >> >> >> > -----Original Message----- >> > From: Barney Boisvert >> > [mailto:[EMAIL PROTECTED] >> > Sent: Wednesday, 2 April 2003 11:17 a.m. >> > To: CF-Talk >> > Subject: RE: Is there a trick... >> > >> > Are you sure about this? It is my understanding that >> > the session scope >> > was >> > protected automatically, but that the application (and >> > server) >> scope still >> > had to be locked. You can avoid having to do read >> > locks with >> CFLOCK on a >> > scope if you ensure that they are never written after >> > initially set, and >> > that every request ensures that they are set before >> > proceeding, but you >> > still have to lock them in one form or another >> > >> > barneyb >> > >> > --- >> > Barney Boisvert, Senior Development Engineer >> > AudienceCentral (formerly PIER System, Inc.) >> > [EMAIL PROTECTED] >> > voice : 360.756.8080 x12 >> > fax : 360.647.5351 >> > >> > www.audiencecentral.com >> > >> > > -----Original Message----- >> > > From: Matthew Walker >> > > [mailto:[EMAIL PROTECTED] >> > > Sent: Tuesday, April 01, 2003 3:00 PM >> > > To: CF-Talk >> > > Subject: RE: Is there a trick... >> > > >> > > >> > > Automatic locking. Previously you needed to write >> > > >> > > <cflock timeout="1" throwontimeout="No" >> > > type="READONLY" >> > > scope="APPLICATION"> >> > > [do something with app variables] >> > > </cflock> >> > > >> > > Many people got around this by simply copying the >> > > application >> > > scope into the >> > > request scope in Application.cfm or thereabouts. >> > > Others simply >> > > wrote lots of >> > > constants directly into the request scope on each >> > > page request >> > > (which isn't >> > > nearly as slow as you might think). >> > > >> > > With CFMX you don't need to lock access to scopes >> > > like application and >> > > session. >> > > >> > > > -----Original Message----- >> > > > From: Calvin Ward [mailto:[EMAIL PROTECTED] >> > > > Sent: Wednesday, 2 April 2003 10:47 a.m. >> > > > To: CF-Talk >> > > > Subject: Re: Is there a trick... >> > > > >> > > > Isaac, >> > > > >> > > > What's the benefit that CFMX offers in the >> > > > Application scope? >> > > > >> > > > Calvin >> > > > >> > > > <cf_snipalot /> >> > > > >> > > > > You'll be needlessly accessing the application >> > > > > scope anyway. The >> > > > application >> > > > > scope should really only be used for data which >> > > > > might change >> > > > periodically >> > > > > based on time of day, administrative interraction >> > > > > (i.e. "this >> > > feature is >> > > > > currently unavailable due to maintenance"), or to >> > > > > refresh >> a cacheing >> > > > > routine, etc. Data which is set, static and >> > > > > required on every page >> > > > should >> > > > be >> > > > > set solely in the request scope, unless you're >> > > > > running CFMX >> > > and planning >> > > > to >> > > > > access it directly from the application scope -- >> > > > > which I >> prefer not >> > to >> > > > do >> > > > > because imho there's no real benefit over using >> > > > > the request >> > > scope while >> > > > > there are definite advantages to using the >> > > > > request scope >> if you end >> > up >> > > > > needing backward compatibility for CF 5. >> > > > > >> > > > > hth >> > > > > >> > > > > >> > > > > s. isaac dealey 954-776-0046 >> > > > > >> > > > > new epoch >> > > > > http://www.turnkey.to >> > > > > >> > > > > lead architect, tapestry cms >> > > > > http://products.turnkey.to >> > > > > >> > > > > tapestry api is opensource >> > > > > http://www.turnkey.to/tapi >> > > > > >> > > > > certified advanced coldfusion 5 developer >> > > > > http://www.macromedia.com/v1/handlers/index.cfm?I >> > > > > D=21816 >> > > > > >> > > > >> > > > >> > > >> > >> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > ~~~~~~~~~~~| > 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 > Get the mailserver that powers this list at > http://www.coolfusion.com > Unsubscribe: http://www.houseoffusion.com/cf_lists/uns > ubscribe.cfm?user=633.558.4 s. isaac dealey 954-776-0046 new epoch http://www.turnkey.to lead architect, tapestry cms http://products.turnkey.to tapestry api is opensource http://www.turnkey.to/tapi certified advanced coldfusion 5 developer http://www.macromedia.com/v1/handlers/index.cfm?ID=21816 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| 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 Your ad could be here. 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