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<H1>Dynamic Loading of Modules</H1>
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<LI><em>To</em>: <A HREF="mailto:mud-dev#null,net">mud-dev#null,net</A></LI>
<LI><em>Subject</em>: Dynamic Loading of Modules</LI>
<LI><em>From</em>: Niklas Elmqvist <<A HREF="mailto:d97elm#dtek,chalmers.se">d97elm#dtek,chalmers.se</A>></LI>
<LI><em>Date</em>: Sat, 21 Mar 1998 11:16:51 +0100 (MET)</LI>
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<PRE>
On Fri, 20 Mar 1998, Jon A. Lambert wrote:
>
> On 24 Feb 98 at 0:12, Niklas Elmqvist wrote:
> >
> > Now, if aClass and bClass had been part of the same binary, I would not
> > have been surprised. In fact, as you probably all know, this is called
> > late binding in the O-O community and is an important feature of all
> > serious O-O languages. However, what surprised and delighted me is that
> > late binding *still* works even though the core and shared lib described
> > above are separately compiled, and the bClass is totally unknown to the
> > core! In my eyes, this is the ultimate test of late binding, and G++
> > pulled it off nicely! Incidentally, a friend (the one mentioned above)
> > later reported that this is impossible in Windows-style DLLs.
>
> Run-time binding, application-level loading and unloading of DLLs
> have been around in Windows ever since it went to 32-bit. There is
> also a standardized API (OLE2) to handle multi-threaded and
> interprocess communications between disparate (loose/non-coupled)
> modules. Reference counts are maintained on DLL modules and by
> default once an application requests the services of a DLL it will
> remain loaded either until the application terminates or issues an
> API call to unload it. If references are held by other processes or
> threads the DLL will not be unloaded until all interested parties
> indicate they have no further use for it.
Yes, I do know that Windows has dynamically linked libraries, just like
Sun and Linux and whatnot (I think they had that *before* it went
32-bit, however). However, I suppose you did not read the earlier
part (this may be blamed on my too-active-snippage), where I explained
about my "discovery" where a server binary with a base class called aClass
could dynamically load a module which implemented a subclass of aClass
called bClass and *still* use the bClass (as a reference to an aClass
object, of course, using polymorphism) even though the server had no idea
of its existence at compile-time. (Phew.) According to my RL friend (I
have no personal experience in this), this scheme is impossible to
implement using Windows DLLs -- I believe he tried after hearing me
explain about it.
Then again, Windows has its own bunch of abominations, COM/DCOM/COM+ being
foremost among these. Although they provide for some nice functionality,
COM objects are expected to delete themselves and call their own
destructor -- need I say more? And this is what some people want instead
of CORBA? *sigh*
-- Niklas Elmqvist (d97elm#dtek,chalmers.se) ----------------------
"You can't trample infidels when you're a tortoise. I mean, all you
could do is give them a meaningful look."
- Terry Pratchett, Small Gods
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<LI><STRONG><A NAME="00800" HREF="msg00800.html">Re: [MUD-Dev] Dynamic Loading of Modules (was: Back on the list</A></STRONG>
<UL><LI><EM>From:</EM> "Jon A. Lambert" <jlsysinc#ix,netcom.com></LI></UL></LI>
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>Dynamic Loading of Modules</STRONG>, <EM>(continued)</EM>
<ul compact>
<ul compact>
<ul compact>
<ul compact>
<LI><strong><A NAME="00787" HREF="msg00787.html">Dynamic Loading of Modules</A></strong>,
Niklas Elmqvist <a href="mailto:d97elm#dtek,chalmers.se">d97elm#dtek,chalmers.se</a>, Fri 20 Mar 1998, 11:39 GMT
<UL>
<LI><strong><A NAME="00797" HREF="msg00797.html">Re: [MUD-Dev] Dynamic Loading of Modules</A></strong>,
Greg Munt <a href="mailto:greg#uni-corn,demon.co.uk">greg#uni-corn,demon.co.uk</a>, Fri 20 Mar 1998, 21:53 GMT
</LI>
<LI><strong><A NAME="00850" HREF="msg00850.html">Re: [MUD-Dev] Dynamic Loading of Modules</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Mon 23 Mar 1998, 19:14 GMT
</LI>
</UL>
</LI>
</ul>
<LI><strong><A NAME="00800" HREF="msg00800.html">Re: [MUD-Dev] Dynamic Loading of Modules (was: Back on the list</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Sat 21 Mar 1998, 00:54 GMT
<UL>
<LI><strong><A NAME="00806" HREF="msg00806.html">Dynamic Loading of Modules</A></strong>,
Niklas Elmqvist <a href="mailto:d97elm#dtek,chalmers.se">d97elm#dtek,chalmers.se</a>, Sat 21 Mar 1998, 10:05 GMT
</LI>
</UL>
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</LI>
<LI><strong><A NAME="00532" HREF="msg00532.html">LDMs (large dynamic maps) was Re: [MUD-Dev] Unique items</A></strong>,
Mike Sellers <a href="mailto:mike#online-alchemy,com">mike#online-alchemy,com</a>, Fri 20 Feb 1998, 08:16 GMT
<UL>
<LI><strong><A NAME="00538" HREF="msg00538.html">Re: [MUD-Dev] Unique items</A></strong>,
The Eternal City <a href="mailto:eternal#eternal,eternal-city.com">eternal#eternal,eternal-city.com</a>, Fri 20 Feb 1998, 14:27 GMT
<UL>
<LI><strong><A NAME="00566" HREF="msg00566.html">Re: [MUD-Dev] Unique items</A></strong>,
coder <a href="mailto:coder#ibm,net">coder#ibm,net</a>, Mon 23 Feb 1998, 19:22 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00563" HREF="msg00563.html">Re: [MUD-Dev] Unique items</A></strong>,
coder <a href="mailto:coder#ibm,net">coder#ibm,net</a>, Mon 23 Feb 1998, 19:12 GMT
</LI>
</UL>
</LI>
</UL></BLOCKQUOTE>
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