[9fans] porting XaoS3.0 to plan9 (problems)

[9fans] porting XaoS3.0 to plan9 (problems)

[Jan]

Hi
yesterday I got first version of XaoS of plan9 vorking but it still has
following serious problems:
XaoS sometimes calcualtes thinks like 1.0/0.0 and expect that result will
be Inf or any other garbage. It still produces correct results. I decided
for this way because it avoids many if (x<epsilon) statements in code and
makes sources more readable and program faster.
Problem is that plan9 (unlike UNIXes) generates floating point exception
in this cases. It is possible to ignore this exception (I know that plan9
has notes instead of signals, is there any note for SIGFPE?)
Best case is of course to set coprocesor into ignoring mode, if there is
any way to do that, it should be much faster, since it avoids unnecesary
SIGFPES.

Another problem is with compiler. XaoS became really fatware(tm) at least
from plan9 point of view (it is approx. 400 kb long and acid thinks that
it is X source :( I will try to make it smaller. But main XaoS loops are
generated by large coprocessor construction, where I always define FORMULA
to formula I want and then include another file that generates custom
internal loop code for this formula. I know that it is not plan9 way to
do thinks, but speed is really significant for XaoS, so I sometimes vote
for speed instead of simplicity/elegancy when required. At this file
8c crases with message that starts with <eof>. (I can send you full
text of this message tommorow). When I uncoment last 5 formulas everything
works, so problem don't seems to be in included file source nor in
formulas (since they compiles well at all other platform). So do you have
any idea what caused this problem?

BTW how does typedefs in plan9 works? Why code
#ifndef AAA
#define AAA
typedef double test;
#endif
won't work when included twice?

BTW is there any users of XaoS for plan9? or I am making this port just
for my own fun? :)

Honza
-- 
------------------------------------------------------------------------------
                   Have you browsed my www pages? Look at:
                       http://www.paru.cas.cz/~hubicka
      Koules-the game for Svgalib,X11 and OS/2,  Xonix-the game for X11
      czech documentation for linux index, original 2D computer art and
              funny 100 years old photos and articles are there!

[9fans] porting XaoS3.0 to plan9 (problems)

[Jan]

On Tue, Sep 09, 1997 at 08:08:38AM +0000, forsyth@caldo.demon.co.uk wrote:
> >>so I have plan9 manpages at my linux box. Reboot always you need some
> >>help is not very nice. At least I should copy them to dos partition and
> 
> there are several packages for Plan 9 out on the net that make
> a user-level file server that will allow you to read, or even read and write,
> a Linux ext2fs partition.  that might make things a little easier for you.
Sounds great! I have to rebrowse 9fans ftp sites :)
Is that safe? Plan9 once damaged fat partitions so I am bit more curefull
now...

BTW is there some other interesting news about plan9? Something changed
in distribution poilticy? (I really want to see sources once...)
whats about brazil?
> 
> Plan 9's man is just an rc script; it's a close relative of the example
> in the tom duff's rc paper.
OK. I will download it soon!

Many thanks
Honza
-- 
------------------------------------------------------------------------------
                   Have you browsed my www pages? Look at:
                       http://www.paru.cas.cz/~hubicka
      Koules-the game for Svgalib,X11 and OS/2,  Xonix-the game for X11
      czech documentation for linux index, original 2D computer art and
              funny 100 years old photos and articles are there!

[9fans] porting XaoS3.0 to plan9 (problems)

[forsyth]

>>Is that safe? Plan9 once damaged fat partitions so I am bit more curefull
>>now...

that had to do with the handling or interpretation of the partition table
especially on installation, and was fairly quickly changed.
the ext2fs servers are distinct programs, and might have bugs
of their own, of course, though no one has mentioned it.
the one i did gave read-only access; someone else wrote a server
that would allow full read/write access.  i haven't had a linux
partition for several years now, and haven't tested the latter myself.

[9fans] porting XaoS3.0 to plan9 (problems)

[Frank]

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  I use it to soak up idle time.

  plan9, fun >= 2

frankg
      >....

>BTW is there any users of XaoS for plan9? or I am making this port just
>for my own fun? :)

>Honza
>-- 

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[9fans] porting XaoS3.0 to plan9 (problems)

[Jan]

On Mon, Sep 08, 1997 at 08:39:34AM +0000, forsyth@caldo.demon.co.uk wrote:
> >>Best case is of course to set coprocesor into ignoring mode, if there is
> >>any way to do that, it should be much faster, since it avoids unnecesary
> 
> man 2 getfcr ?
Ok thank you very much, I will read it soon.
BTW it is possible to get man for plan9? My demo instalation don't have them,
so I have plan9 manpages at my linux box. Reboot always you need some
help is not very nice. At least I should copy them to dos partition and
read them using acme :)

Honza

-- 
------------------------------------------------------------------------------
                   Have you browsed my www pages? Look at:
                       http://www.paru.cas.cz/~hubicka
      Koules-the game for Svgalib,X11 and OS/2,  Xonix-the game for X11
      czech documentation for linux index, original 2D computer art and
              funny 100 years old photos and articles are there!

[9fans] porting XaoS3.0 to plan9 (problems)

[forsyth]

>>so I have plan9 manpages at my linux box. Reboot always you need some
>>help is not very nice. At least I should copy them to dos partition and

there are several packages for Plan 9 out on the net that make
a user-level file server that will allow you to read, or even read and write,
a Linux ext2fs partition.  that might make things a little easier for you.

Plan 9's man is just an rc script; it's a close relative of the example
in the tom duff's rc paper.

[9fans] porting XaoS3.0 to plan9 (problems)

[forsyth]

>>Best case is of course to set coprocesor into ignoring mode, if there is
>>any way to do that, it should be much faster, since it avoids unnecesary

man 2 getfcr ?