February 1999
- client images Chris Gray
- Question on c++ switch optimization, and parsers in general. Ben Greear
- Question on c++ switch optimization, and parsers in general. Adam Wiggins
- Question on c++ switch optimization, and parsers in general. Ola Fosheim Grøstad
- Question on c++ switch optimization, and parsers in general. Chris Gray
- Question on c++ switch optimization, and parsers in general. Chris Gray
- Question on c++ switch optimization, and parsers in general. T. Alexander Popiel
- Question on c++ switch optimization, and parsers in general. Ola Fosheim Grøstad
- Question on c++ switch optimization, and parsers in general. Richard Woolcock
- Question on c++ switch optimization, and parsers in general. Marc Hernandez
- Question on c++ switch optimization, and parsers i Chris Gray
- Question on c++ switch optimization, and parsers i Jon A. Lambert
- Question on c++ switch optimization, and parsers i Chris Gray
- optimizing code diablo@best.com
- optimizing code Hans-Henrik Staerfeldt
- optimizing code Chris Gray
[Hans-Henrik Staerfeldt replying to <diablo@best.com>:]
>The way to do this is to implement an 'event queue'. The queue is a sorted
>list of whan what is going to happend. So you peek at the first element,
>and notice that it need activation at time x, then wait (sleep) for x-now
>timeslices and then start the event at the top of the queue (might be
>a mobile moving, or parsing of one players commands). If the event is
>to be recurring regularly, insert a new event in the list at the time
>the event is to recur .. as simple as that.
>
>If a mobile has two timers, it should have two event in the queue.
>We have used this system extremely successfully in Valhalla where the
>event queue is the very core of the engine (along with messages)
>to handle unlimited number of co-routines to be attached to each
>object.
Agreement here. This sort of question has come up a couple of times
over the years, and I think it comes down to how your MUD is structured.
Mine is completely single-threaded - it isn't linked with a threading
library. So, I have a sorted list of events (sorted by expiry time)
like Hans-Henrik describes. My way of waiting for the time to the
earliest event to expire is to put that time into the main 'select'
call on the connection and client sockets. Since all new events will
be created either by user action or an internal event from the timer
queue, I know that the select is not active when any new event is added
to the queue. (It was a bit more compicated on the Amiga, where I had
to cancel a too-long timer and restart it at the desired interval.)
A couple of refinements to this can be done. One is that the MUD is
there to service players, not its internal workings. So, I put a limit
on how many timer events I would service before going back to check
for client socket activity by just doing the select with a 0 timeout -
no need for special code.
Also, whatever wakeup mechanism is used (select in this discussion) isn't
guaranteed to wakeup right on time - it may be a bit late. So, after the
wakeup and servicing of sockets, I find the current time, and run
through the event list doing events scheduled for any time before the
current time (subject to the above-mentioned event limit).
My mobiles ("machines" in my terminology) normally only have one event
each. When that goes off, they do whatever they need to do, and end the
event processing by scheduling the next one. Having two separate events
might complicate the code in those events, if they have any possibilities
of interacting.
[P.S. No need to be formal about names - Chris G. works fine. The 'G.'
being needed since there are at least 2 active Chris's on the list.
Although the other seems to go by JC or JCL.]
--
Don't design inefficiency in - it'll happen in the implementation. - me
Chris Gray cg@ami-cg.GraySage.Edmonton.AB.CA
http://www.GraySage.Edmonton.AB.CA/cg/
- code profiling Chris Gray
- World-file parsing and RTTI? The Arrow
- World-file parsing and RTTI? Mark Gritter
- pet peeves diablo@best.com
- pet peeves diablo@best.com
- pet peeves Caliban Tiresias Darklock
- pet peeves Marc Bowden
- pet peeves Richard Woolcock
- pet peeves Koster, Raph
- pet peeves diablo@best.com
- pet peeves Caliban Tiresias Darklock
- pet peeves Kristen Koster
- pet peeves Caliban Tiresias Darklock
- pet peeves Adam Wiggins
- pet peeves Wes Connell
- pet peeves J C Lawrence
- pet peeves Matthew Mihaly
- pet peeves Ling
- pet peeves Ola Fosheim Grøstad
- pet peeves Matthew Mihaly
- pet peeves Ola Fosheim Grøstad
- pet peeves Matthew Mihaly
- pet peeves David Bennett
- pet peeves Robert Woods
- pet peeves Wes Connell
- pet peeves Travis S. Casey
- pet peeves Matthew Mihaly
- pet peeves Neerenberg, AaronX
- pet peeves greg
- pet peeves Richard Woolcock
- pet peeves J C Lawrence
- pet peeves Martin Keegan
- pet peeves Ola Fosheim Grøstad
- pet peeves J C Lawrence
- pet peeves diablo@best.com
- pet peeves Brandon A Downey
- pet peeves diablo@best.com
- pet peeves Darren Henderson
- pet peeves diablo@best.com
- pet peeves Darren Henderson
- pet peeves Steve Houchard
- pet peeves diablo@best.com
- pet peeves Darren Henderson
- pet peeves diablo@best.com
- pet peeves Steve Houchard
- pet peeves diablo@best.com
- pet peeves Richard Woolcock
- pet peeves diablo@best.com
- pet peeves Richard Woolcock
- pet peeves Apocalypse
- pet peeves Caliban Tiresias Darklock
- pet peeves diablo@best.com
- pet peeves Adam Wiggins
- pet peeves diablo@best.com
- pet peeves Adam Wiggins
- pet peeves diablo@best.com
- pet peeves Mik Clarke
- pet peeves Caliban Tiresias Darklock
- pet peeves Travis S. Casey
- pet peeves Caliban Tiresias Darklock
- pet peeves Benjamin D. Wiechel
- pet peeves Marc Bowden
- pet peeves Matthew Mihaly
- pet peeves Mik Clarke
- pet peeves Benjamin D. Wiechel
- pet peeves Matthew Mihaly
- pet peeves Caliban Tiresias Darklock
- pet peeves Marc Bowden
- pet peeves Matthew Mihaly
- pet peeves David Bennett
- pet peeves David Bennett
- pet peeves Petri Virkkula
- pet peeves J C Lawrence
- Horror Themed Muds [was CthulhuMud Driver 6] Christopher Allen
- Horror Themed Muds [was CthulhuMud Driver 6] Caliban Tiresias Darklock
- Horror Themed Muds [was CthulhuMud Driver 6] Mik Clarke
- CthulhuMud Driver 6 Mik Clarke
- CthulhuMud Driver 6 J C Lawrence
- Mathengine Ling
- Mathengine Apocalypse
- Website update Koster, Raph
- Influential muds Koster, Raph
- Influential muds Dan Shiovitz
- Influential muds Adam Wiggins
- Influential muds Sunny Gulati
- Influential muds diablo@best.com
- Influential muds Juha Lindfors
- Influential muds Brandon J. Rickman
- Influential muds Caliban Tiresias Darklock
- Influential muds Andy Cink
- Influential muds J C Lawrence
- Influential muds Dr. Cat
- Influential muds Jay Carlson
- Influential muds Mik Clarke
- Influential muds Richard Woolcock
- Influential muds Koster, Raph
- Influential muds Mik Clarke
- Influential muds Ola Fosheim Grøstad
- Influential muds Dan Root
- Influential muds Benjamin D. Wiechel
- State of the art? Andy Cink
- State of the art? diablo@best.com
- State of the art? Caliban Tiresias Darklock
- State of the art? ##Make Nylander
- State of the art? diablo@best.com
- State of the art? Martin Keegan
- State of the art? David Bennett
- State of the art? Martin Keegan
- State of the art? Andy Cink
- State of the art? J C Lawrence
- State of the art? David Bennett
- State of the art? Matthew Mihaly
- State of the art? Caliban Tiresias Darklock
- State of the art? Matthew Mihaly
- State of the art? Ola Fosheim Grøstad
- State of the art? Ola Fosheim Grøstad
- State of the art? J C Lawrence
- State of the art? Matthew Mihaly
- State of the art? Mik Clarke
- State of the art? J C Lawrence
- The Terrorist Class Ola Fosheim Grøstad
- The Terrorist Class Mik Clarke
- Welcome To "MUD-Dev"! mud-dev-admin@kanga.nu
- IMPORTANT ADMIN: New list setup requires your attention J C Lawrence
- ADMIN: URL change J C Lawrence
- PermaDeath (was pet peeves) Marc Hernandez
- ScryMUD 1.8.7 released. Ben Greear
- PermaDeath Sayeed
- PermaDeath Ola Fosheim Grøstad
- PermaDeath Sayeed
- roleplaying and immersion (was: PermaDeath) Ola Fosheim Grøstad
- Roleplaying and Immersion (was: PermaDeath) Sayeed
- Roleplaying and Immersion (was: PermaDeath) Adam Wiggins
- Roleplaying and Immersion (was: PermaDeath) J C Lawrence
- Roleplaying and Immersion (was: PermaDeath) Ola Fosheim Grøstad
- WEB: VR-stuff Ola Fosheim Grøstad
- WEB: VR-stuff J C Lawrence
- WEB: VR-stuff Mik Clarke
- WEB: VR-stuff Marian Griffith
- WEB: VR-stuff J C Lawrence
- ADMIN: The list archives are now online and fully searchable J C Lawrence
- Theories was pet peeves Wes Connell