Subject:
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Re: anyone know how to check free space on RCX?
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Fri, 12 Jul 2002 20:50:11 GMT
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Viewed:
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5673 times
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John A. Tamplin, Jason Clark, Jochen Hoenicke and Michael J Ash:
Thank you all for addressing these issues! It all make sense after reading
the preceeding messages.
I appologize for causing confusion. I am glad, however, to get it straight.
??So should program.c continue to use lcd_int to display the value in
decimal? Wouldn't it be better to just display the hex and be done with
it??
// Joe
"Michael Obenland" <obenland@t-online.de> wrote in message
news:Gz5Gq1.ABE@lugnet.com...
>
> > #define MM_HEADER_SIZE 2 //!< 2 words header: pid, size
>
> > Why would the memory manager use all ints when 32bit math is so much
> > slower on an h8? I feel like i'm missing something.
> >
> > This is another reason why 32-bit ints make no sense; int is almost • never
> > a size that isn't native to the processor. So either you misread the
> > header or... I guess I don't quite understand. Any comments on that?
>
> The header is ok, but int is 2 bytes = 16 bit. You can check this with • this
> highly optimized program:
>
> #include <conio.h>
>
> int main(int argc, char *argv[])
> {
> lcd_int( sizeof( int ) );
> for(;;)
> ;
> return 0;
> }
>
> And in the kernel sources, mm.c says the following:
>
> //
> // memory block structure:
> // 0 1 : pid of owner (0=empty)
> // 2 3 : size of data block >> 1
> // 4 ... 4+2n: data
> //
>
> pid and size are 2 byte values.
>
> Regards,
>
> Michael
>
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