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stiggity
Account closed
Registered: Jul 2013
Posts: 5 |
c64 garbage collection, NEED HELP!!!
I came across a real nice "aftermarket" c64 garbage collection routine. I spent 2 hours on the source, and got it able to
compile in my assembler (64tass). but, all comments are in
German. Im writing a BBS program for the 64, and it runs and
works, but it will pause for 10/12/15 seconds here and there. And anyone not knowing its collecting garbage, may
drop carrier. I would like to intermingle this code, into my own project, but believe its a little above my skills level. If anyone is into c64 telecom, and thinks they could help me out, be my guest. I can describe, and explain how my memory is laid-out, with the BBS. So if you think your good, and believe this code _can_ be intermingled, I can fully credit you in docs, manual, website, and email support. Thanks. Id rather go back and forth via E-mail, rather than posting the source here. I'm safe! :)
-Thanks,
--Steve
stiggity99(@)Comcast.net |
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Tao
Registered: Aug 2002
Posts: 115 |
Quote: And I thought Tao modded C*Base is the best there is anyhow nowadays? :)
It is :P But I don't use a custom GC routine. I expect most BBS programs do the same thing as C*Base -- call the standard garbage collector from the wait screen. |
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chatGPZ
Registered: Dec 2001
Posts: 11386 |
i actually remember driving to moses for hacking a fast garbage collection into c*base so it wouldnt be vulnerable to the good old wait-at-prompt-for-minutes problem :) |
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JackAsser
Registered: Jun 2002
Posts: 2014 |
Found this floating around: http://www.atarimagazines.com/compute/issue49/422_1_Garbage_Col.. |
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soci
Registered: Sep 2003
Posts: 480 |
As the article says this is a solved problem in later basic versions.
The solution was to put a "back" pointer right after the allocated string which points to the string length and pointer of the original variable/array element.
Deleted strings reuse this pointer for noting down the size of the deleted string by using a special pointer of $ffxx.
With this it's trivial to garbage collect in O(n) time.
Just start from the end of string area. Either there's a normal back pointer, this can be used to find out how big the string is and where to adjust it's pointer after the move.
Or it could be a special pointer ($ffxx) then it's a hole, skip it over, the length is the xx part.
Then continue compaction until the beginning of string area is reached.
This costs 2 extra bytes per string of course. And the amount of extra code which fixes/replaces the original string handling... |
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