It's an interesting topic, and really good timing for
this to come up. I was at a CFUG sponsored conference,
CF-Southwest yesterday. And the mighty B.F. was there,
and talked quite about about this very subject. I do
remember him answering a question with something like:
"no, if you only read application variables, you do
not need to lock them."
Maybe I was drunk, but I don't remember drinking anything
but a coke at lunch.
What I did pull out of that talk, though, was that you
can not corrupt the server's memory with reads alone.
Only writing to a variable while it is being read will
cause the pcode exceptions you so diligently seek.
-Erik
> -----Original Message-----
> From: Nat Papovich [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, April 25, 2001 3:08 PM
> To: Fusebox
> Subject: RE: the $5 bet - crash a server with unlocked
> application scope
> READs
>
>
> As a matter of fact I DO have a magical CF server that never
> crashes, Erik.
> You have one too? It's an Amiga.
>
> To prove a point, I did not mention the <cfif not
> IsDefined("application.var")> tag before the application read
> because I
> wanted to imagine a case of ONLY reads.
>
> I might be seeming weird about it because I'm trying to get
> the skinny on
> exactly how locking works - something that I'm not even sure
> Allaire knows
> too much about. I think I pretty well have my noggin around it, but if
> someone shows me the case of unlocked read-only access to a
> shared scope
> variable causing problems, then it's back to the drawing board for me.
>
> NAT
>
> > -----Original Message-----
> > From: Erik Voldengen [mailto:[EMAIL PROTECTED]]
> > Sent: Wednesday, April 25, 2001 1:24 PM
> > To: Fusebox
> > Subject: RE: the $5 bet - crash a server with unlocked
> application scope
> > READs
> >
> >
> > > build. During some of this checking, I re-initialize the
> application
> > > variables, for good measure. This is the only time the
> > > application variables
> > > ever get written. There is no code anywhere else to do it,
> > > and I am always
> > > the only one on the admin area.
> >
> > That sounds flakey. What if CF restarts? ba-bye
> application variables.
> > Perhaps you have a magical machine with 100% up time?
> >
> > A read-only lock only adds overhead if there is an exclusive lock on
> > the scope. Out of curiosity, why are you being so wierd about it?
> >
> >
> >
> >
> >
> >
>
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