Re: [email] Re: [GD-General] Scripting Systems

[Alen L. <ale...@cr...>]

Well, running it on one stack worked ok for us during last several years,
and lot of other people use that. However, I cannot claim which technique is
most often. I believe that most people do cooperative instead of preemptive
for scripts, and general multithreading is avoided like a plague, unless
really necessary (loading in the background, etc.).

Just my 0.02$.

Alen


----- Original Message -----
From: "Dan Thompson" <da...@ar...>
To: <gam...@li...>
Sent: Wednesday, January 21, 2004 20:01
Subject: Re: [email] Re: [GD-General] Scripting Systems


> All engine calls are atomic, so after each call we try to guarantee the
> validity of an object.
>
> Of course, there could be situations where this is not possible, so
perhaps
> the premtive isn't good. However, I couldn't think of any other way to
> prevent scripts from being able to eat all the processor.
>
> The only break we get is since its user level threading, we control
exeactly
> when the preemption occurs.
>
> Do people often just make one script stack, and have multiple files
running
> in it? Or one stack per script?
>
> -Dan
>
> ----- Original Message -----
> From: "Alen Ladavac" <ale...@cr...>
> To: <gam...@li...>
> Sent: Wednesday, January 21, 2004 4:21 AM
> Subject: [email] Re: [GD-General] Scripting Systems
>
>
> >
> > ----- Original Message -----
> > From: "Dan Thompson" <da...@ar...>
> > > This method is vs. just running a script and creating the stack when
the
> > > message comes in. This seemed far too expensive, as you could be
> creating
> > > script stacks all over the place, and it also runs into the problem
> where
> > > the game locks because the scripts are being run in the same thread.
> >
> > AFAIK, one usual method is to make sure that all "yields" are always on
> the
> > bottom of the stack so you don't need to keep and store stack for each
> > script. This of course rules out real preemptiveness. But... how do you
> > handle that anyway? Don't you ever get problems with one script being
> > interrupted in the middle of modifying some object and another one
> accessing
> > that same object in a half-valid state? And having scripts running on a
> > different thread? Do you use some synchronizations when accessing other
> > subsystems from scripts?
> >
> > Alen
> >
> >
> >
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