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 Robotics / RCX / legOS / 1216
1215  |  1217
Subject: 
Persistent globals
Newsgroups: 
lugnet.robotics.rcx.legos
Date: 
Sun, 16 Jul 2000 19:05:48 GMT
Viewed: 
1475 times
  
Whew, I've been writing here a lot. I guess now that things work, it's a
lot more enjoyable! :) Anyway, here goes....

I recall that with older versions of legOS, global variables were only
initialized once, when the program was downloaded. Afterwards, they were
preserved across runs and powerdowns until the program was reloaded from
the computer again. I'm now in a sitaution where that would be helpful to
me, and it looks as if legOS 0.2.3 eliminates it. Is this correct, or am I
seeing something totally different? If it is correct, is there a good way
now to store persistent data like that?

--
  "Do not go gentle into that good night.
   Rage, rage against the dying of the light."
                    - Dylan Thomas
Mike Ash - <http://www.mikeash.com/>, <mailto:mail@mikeash.com>



Message has 2 Replies:
  Re: Persistent globals
 
(...) It is correct. Everytime you reload a program it re-initializes everything, including a specific program's memory, so all that kind of information is lost. I'm not sure that there is a way to duplicate that behavior, as things stand. The only (...) (24 years ago, 16-Jul-00, to lugnet.robotics.rcx.legos)
  Re: Persistent globals
 
(...) legOS 0.2.3 or 0.2.4 will load .strings and .rodata sections just like the .text section. With this you can achive persistent data by storing your variables into the .strings section. There are some nice features in gcc to help with this. Just (...) (24 years ago, 16-Jul-00, to lugnet.robotics.rcx.legos)

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