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<H1>Re: [MUD-Dev] Event handling (was: request for comments)</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>: Re: [MUD-Dev] Event handling (was: request for comments) </LI>
<LI><em>From</em>: JC Lawrence <<A HREF="mailto:claw#under,Eng.Sun.COM">claw#under,Eng.Sun.COM</A>></LI>
<LI><em>Date</em>: Thu, 15 Jan 1998 20:31:41 -0800</LI>
<LI><em>cc</em>: <A HREF="mailto:claw#null,net">claw#null,net</A></LI>
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<PRE>
On Mon, 12 Jan 1998 07:43:01 PST8PDT
s001gmu <s001gmu#nova,wright.edu> wrote:
> On Sun, 11 Jan 1998, JC Lawrence wrote:
>> Note: "event" is actually a very poor term for what we are
>> describing here. They really aren't events, but I'm unsure of a
>> better name for them.
> Actions?
Hurm. Not bad.
>> Certainly. You create an event chain (as above) which iteratively
>> saps the character's strength and vitality. Should that process
>> happen to kill the character (strength == 0?) then this will be
>> noticed by the normal methods of the character object (probably in
>> the accessor for the strength attribute) and processed from there.
> As I understand it, the only difference is that he shortcuts the
> event chain by having the running thread (process in his terms)
> handle all of the delays by going to sleep, rather than scheduling a
> new event to go off X ticks down the road.
> There are some advantages to doing it that way... You can have the
> thread sleep by using pthread_cond_timedwait (assuming you are using
> posix threads) , and use the condition var as an interrupt signal,
> allowing for very gracefull interruption and interrupt handling. If
> you want to interrupt a pending event in an event queue, you have to
> search the queue, or have some kludgy structure imposed above the
> queue to allow for easier access, etc.
There is a significant implication in this system however. It
effectively requires that you use a locking model, as to not use a
locking model would have most sleeping threads fail due to other more
rapidly commiting threads interfering with their data references.
Conversely, if you do go for a locking system the problem is then
preventing the system from bogging down to a worse-than serial
execution case as the events all contend and lock-wait for shared
data.
--
J C Lawrence Internet: claw#null,net
Internet: coder#ibm,net
----------(*) Internet: jc.lawrence#sun,com
...Honourary Member of Clan McFud -- Teamer's Avenging Monolith...
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<li><strong><A NAME="00246" HREF="msg00246.html">Event handling (was: request for comments)</A></strong>
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<ul><li>Thread context:
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<LI><STRONG>Re: [MUD-Dev] Event handling (was: request for comments)</STRONG>, <EM>(continued)</EM>
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<LI><strong><A NAME="00155" HREF="msg00155.html">Re: [MUD-Dev] Event handling (was: request for comments)</A></strong>,
Vadim Tkachenko <a href="mailto:vadimt#4cs,com">vadimt#4cs,com</a>, Fri 09 Jan 1998, 23:03 GMT
<UL>
<LI><strong><A NAME="00198" HREF="msg00198.html">Re: [MUD-Dev] Event handling (was: request for comments)</A></strong>,
JC Lawrence <a href="mailto:claw#under,Eng.Sun.COM">claw#under,Eng.Sun.COM</a>, Sun 11 Jan 1998, 21:09 GMT
<LI><strong><A NAME="00209" HREF="msg00209.html">Event handling (was: request for comments)</A></strong>,
s001gmu <a href="mailto:s001gmu#nova,wright.edu">s001gmu#nova,wright.edu</a>, Mon 12 Jan 1998, 14:41 GMT
<LI><strong><A NAME="00222" HREF="msg00222.html">[MUD-Dev] Event handling - some definitions</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Tue 13 Jan 1998, 00:55 GMT
</LI>
<LI><strong><A NAME="00245" HREF="msg00245.html">Re: [MUD-Dev] Event handling (was: request for comments)</A></strong>,
JC Lawrence <a href="mailto:claw#under,Eng.Sun.COM">claw#under,Eng.Sun.COM</a>, Fri 16 Jan 1998, 04:31 GMT
<LI><strong><A NAME="00246" HREF="msg00246.html">Event handling (was: request for comments)</A></strong>,
s001gmu <a href="mailto:s001gmu#nova,wright.edu">s001gmu#nova,wright.edu</a>, Fri 16 Jan 1998, 15:35 GMT
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<LI><strong><A NAME="00195" HREF="msg00195.html">Re: [MUD-Dev] Event handling (was: request for comments)</A></strong>,
JC Lawrence <a href="mailto:claw#under,Eng.Sun.COM">claw#under,Eng.Sun.COM</a>, Sun 11 Jan 1998, 20:44 GMT
<UL>
<LI><strong><A NAME="00207" HREF="msg00207.html">Re: [MUD-Dev] Event handling (was: request for comments)</A></strong>,
Matt Chatterley <a href="mailto:root#mpc,dyn.ml.org">root#mpc,dyn.ml.org</a>, Mon 12 Jan 1998, 10:02 GMT
</LI>
<LI><strong><A NAME="00210" HREF="msg00210.html">Event handling (was: request for comments)</A></strong>,
s001gmu <a href="mailto:s001gmu#nova,wright.edu">s001gmu#nova,wright.edu</a>, Mon 12 Jan 1998, 15:13 GMT
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