> Also, in RL i'm using nice(10000) and 'nice 10000' frequently, just
> because sometimes i dont remember wether it's 0-40 or -20 to +20 :) If it
> did a sys_nice(+20) it would give very bad interactive performance
> compared to a nice +19 process.
Nice only allows to set relative priorities. It's been a commonly used
and in the UNIX literature documented hack for setting an absolute priority
to do something like
setpri(int prio)
{
prio += 20;
nice(-20);nice(-20);nice(-20);nice(-20);
while(prio > 0) {
nice(prio);
prio -= 20;
}
}
This would nastily interact with the nice +20 SCHED_IDLE thing.
Ralf
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