On Tue, 26 Sep 2000, Adriano Camargo Rodrigues da Cunha wrote:
> UZIX processes have priority. You can use a daemon process as a
> JUMP driver (as TCP/IP do). The only problem that can arise is that it
> will slow down the link (assuming JUMP is a sincronous protocol - an
> asincronous protocol will not work, because UZIX JUMP driver will lose
> bits).
I understand. It is actually a good thing to give the driver a priority,
because then the user can decide if she wants to slow down the network to
get better performance or not.
So Grauw (you were writing a paper on an asynchronous protocol, right?),
please hurry up and post it, so we can soon realise it.
> The best thing (even for TCP/IP) would be putting the driver
> inside the kernel (but it can't be done now, due to low memory).
It is good to be compatible with e.g. 64kB, but you could use the system
as in linux, where the user can compile her own kernel with or without
support for all kind of things, so she can choose to have a powerfull
kernel or a small one.
I personally like the idea of a microkernel very much though, because it
can be bugfree eventually. The idea is to have the kernel doing the
resource managing (memory, cpu time) and leave the device managing (vdp,
psg, etc) to the drivers. The drivers should then not have all
permissions, as they do in the linux kernel, but also be limited, so the
kernel doesn't hang if a driver does.
Drivers should be run-time includable and removable (like insmod and
rmmod, but in a more transparent way). I don't know if you feel like
including those ideas into UZIX. I just think it is a good idea, because
it gives the possibility to put drivers like tcp/ip in the kernel, without
wasting the space/opening possible security holes for the users that don't
use them.
Bye,
main(){int c[4] ,x=4 ,l=getpid() ,i;; for( srand(l);c[ x]=- rand
()%6 ,x-- ;);; for( ;44> x;){ char a[9] ,*p=
"%.1f\n", b[9];x=i=0; gets(a);for (l=4 ;l-- ;)x+=-(a[l] -=48)==
(b[l ]=c[ l]); ;for (l=0;16 >i;l =++i %4)x
+=(b[i/4]+ a[l] ?0:( a[l]=b[i/4] =10)) ;printf(p,x *.1) ;};}
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