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<H1>[MUD-Dev] Re: lockless system - foolproof?</H1>
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<LI><em>To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
<LI><em>Subject</em>: [MUD-Dev] Re: lockless system - foolproof? </LI>
<LI><em>From</em>: J C Lawrence <<A HREF="mailto:claw#kanga,nu">claw#kanga,nu</A>></LI>
<LI><em>Date</em>: Sun, 30 Aug 1998 13:23:26 -0700</LI>
<LI><em>Reply-To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
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<PRE>
On Sun, 30 Aug 1998 10:03:18 -0600
Chris Gray<cg#ami-cg,GraySage.Edmonton.AB.CA> wrote:
> I certainly don't want to speak for JC, but here's my
> understanding...
> The goal is to have the programmer not have to worry about issues
> like that - they are too tricky for most people who would want to
> try scripting on a MUD. So, JC's system, last I heard, doesn't
> present any specific locking or commit primitives to the
> programmer. The goal is to have the underlying system take care of
> it all for you. A lofty goal, but very nice if achieved effectively.
Correct. There are no locking or commit sematics exposed to the user
or programmer.
> As an event runs, the system keeps original, untouched copies of all
> database objects that the event references or changes. As the event
> changes things, copies of the originals are made, and the changes
> are put into those copies. When the event completes, the C&C
> (compare and commit) happens (all automatically). If any of the
> objects that the event referenced have been changed in the meantime,
> then the event must be retried. Otherwise, the event's changes are
> atomically committed to the database.
Bingo!
> I think there were some optimizations possible. There could be lots
> of retries needed on busy objects. I believe some of the suggested
> solutions involved the scheduling of events, with the final attempt
> that of running the contentious (hah!) event all by itself, with
> nothing else running.
<nod>
> That said, now JC can berate me for not understanding things
> properly!
Why would I ever do that?
--
J C Lawrence Internet: claw#null,net
----------(*) Internet: coder#ibm,net
...Honourary Member of Clan McFud -- Teamer's Avenging Monolith...
</PRE>
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<LI><STRONG><A NAME="00875" HREF="msg00875.html">[MUD-Dev] Re: lockless system - foolproof?</A></STRONG>
<UL><LI><EM>From:</EM> Chris Gray <cg#ami-cg,GraySage.Edmonton.AB.CA></LI></UL></LI>
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><strong><A NAME="00914" HREF="msg00914.html">[MUD-Dev] VT-100 and other terminal data</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Wed 02 Sep 1998, 19:14 GMT
<LI><strong><A NAME="00881" HREF="msg00881.html">[MUD-Dev] Admin: OS wars and avocacy are off-topic</A></strong>,
J C Lawrence <a href="mailto:claw#kanga,nu">claw#kanga,nu</a>, Sun 30 Aug 1998, 21:26 GMT
<LI><strong><A NAME="00875" HREF="msg00875.html">[MUD-Dev] Re: lockless system - foolproof?</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Sun 30 Aug 1998, 16:06 GMT
<UL>
<LI><strong><A NAME="00877" HREF="msg00877.html">[MUD-Dev] Re: lockless system - foolproof?</A></strong>,
James Wilson <a href="mailto:jwilson#rochester,rr.com">jwilson#rochester,rr.com</a>, Sun 30 Aug 1998, 19:44 GMT
</LI>
<LI><strong><A NAME="00879" HREF="msg00879.html">[MUD-Dev] Re: lockless system - foolproof?</A></strong>,
J C Lawrence <a href="mailto:claw#kanga,nu">claw#kanga,nu</a>, Sun 30 Aug 1998, 20:23 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00874" HREF="msg00874.html">[MUD-Dev] Re: Modular MUD</A></strong>,
D. B. Brown <a href="mailto:dbrown1#stny,lrun.com">dbrown1#stny,lrun.com</a>, Sun 30 Aug 1998, 16:04 GMT
<UL>
<li><Possible follow-up(s)><br>
<LI><strong><A NAME="00880" HREF="msg00880.html">[MUD-Dev] Re: Modular MUD</A></strong>,
quzah <a href="mailto:quzah#geocities,com">quzah#geocities,com</a>, Sun 30 Aug 1998, 21:10 GMT
<UL>
<LI><strong><A NAME="00884" HREF="msg00884.html">[MUD-Dev] Re: Modular MUD</A></strong>,
Caliban Tiresias Darklock <a href="mailto:caliban#darklock,com">caliban#darklock,com</a>, Mon 31 Aug 1998, 12:04 GMT
<UL>
<LI><strong><A NAME="00885" HREF="msg00885.html">[MUD-Dev] Re: Modular MUD</A></strong>,
Adam J. Thornton <a href="mailto:adam#phoenix,Princeton.EDU">adam#phoenix,Princeton.EDU</a>, Mon 31 Aug 1998, 14:18 GMT
</LI>
</UL>
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