In fact nice is a very simple program. It only changes the
priority value of a process in a POSIX-compliant way.
There is no need to change or adapt it; it still works fine
in the SMP world and with new schedulers. It's up to the
scheduler to interpret and handle the priority values of
processes.
In other words: The nice(1) tool only attaches a number to
a process, nothing more. Only the scheduler knows what that
number means. So there's no need to change nice(1).
Great. So, the key is the scheduler; it makes sense.
By the way, the source code of nice(1) is almost trivial.
Basically it just calls the setpriority(2) and execve(2)
syscalls. 99% of the source file consists of the BSD
license test, arguments parsing and C syntax overhead.
Thanks for aclaration. ;)
--
I must not fear. Fear is the mind-killer. Fear is the little-death that
brings total obliteration. I will face my fear. I will permit it to pass
over me and through me. And when it has gone past I will turn the inner
eye to see its path. Where the fear has gone there will be nothing. Only
I will remain.
Bene Gesserit Litany Against Fear.
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