From: Alexander Schofield <pcs3@...>
Date: 2002-02-14T15:58:39+09:00
Subject: Re: restarting interpreter, undefining objects..?

Could you fake this multiple processes?  That is, fork off a child
process when a plug-in is loaded?  The performance hit shouldn't be too
bad, they'd share text segments and a lot of the modern Unices have some
pretty impressive copy-on-write semantics.  The parent would then
roughly correspond to the main driver and the  plug-in unloading would
correspond to a child proc exiting.  You'd have to ensure that only
child procs started Ruby, and child procs were only forked off from the
parent.  At least that would be the ideal, a snag of course would be if
the child had to share info about the next plug-in to be loaded with the
parent.  Then you'd need a more complicated IPC mechanism, unless you
got creative with wait.

If you're on NT I'm useless to you, but from a recent Rubygarden poll
statistics are on my side.

Fitzberg Brian wrote:
> 
> Hi there,
> 
> I'm working on an application (C/C++) that will use ruby
> as a plug-in scripting language.  So far I've had pretty
> good success loading and invoking ruby code from the
> application, however I've hit a bit of a snag.
> 
> Basically, when the app. switches to another plug-in, I
> would like to "undefine" the previously loaded one.  That
> is, I want to be able to load ruby code and execute it
> (I'm doing this by calling pre-named methods in a
> pre-named object), then "unload" this ruby code so that I
> can load another and execute that without there being any
> conflict (or waste of resources).
> 
> Is it possible to clear or reset the embedded interpreter?
>  Alternatively, is it possible to shut down and re-start
> the interpreter?  I have not managed to find anything to
> do the first, and so far have not been able to shut down
> the interpreter without it causing the calling app to
> exit.  (I did, however, discover the set exit function,
> but that still does not prevent the exit from occuring.)
> 
> Any help would be greatly appreciated.  Thanks for your
> time!
> 
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-- 
Alexander Schofield