On Fri, 8 Sep 2000, Laurens Holst wrote:
> > Yes, a timeout is needed for such situations. But as long as the other
> > side is connected (and running an os with JUMP drivers), everything should
> > be ok and no locks are possible.
>
> You should _never_ assume that... One flawd bit on the ack line and... The
> receiver thinks he sent an ack and waits for the next data, the sender
> didn't receive an ack so he doesn't send the next packet... wham. Lock.
If I set the joystick port to 1, it cannot go to 0 and stay there, or can
it? even if it can, you should just refresh the signal every now and then
and you can still design a protocol with no dead-lock posibility.
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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