Re: Linux Kernel Patch; setpriority

Chris Wright (
Wed, 27 Mar 2002 14:32:31 -0800

* Stephen Baker ( wrote:
> This patch will allow a process or thread to changes it's priority
> dynamically based on it's capabilities. In our case we wanted to use
> threads with Linux. To have true priorities we need root to use
> SCHED_FIFO or SCHED_RR; in many case root access is not allowed but we
> still wanted priorities. So we started using setpriority to change a
> threads priority. Now we used nice values from 19 to 0 which did not
> require root access. In some cases a thread need to raise it's nice
> level and this would fail. I also saw a note man renice(8) that said
> this bug exists.

hmm, SUS v3 seems to disagree.

"Only a process with appropriate privileges can lower its nice value."

and with this patch setpriority(2) is now inconsistent with nice(2)
(albeit i don't know how much longer that interface will persist in arch
independent portion of the kernel based on the comments surrounding it).

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