go to
> nice(1)
> ps(1)
> setpriority(2)
> nice(3)
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man page of rtprio

rtprio: examine or modify a process realtime or idle priority


rtprio - examine or modify a process realtime or idle priority


Standard C Library (libc, -lc)


#include <sys/types.h> #include <sys/rtprio.h> int rtprio(int function, pid_t pid, struct rtprio *rtp);


The rtprio() system call is used to lookup or change the realtime or idle priority of a process. The function argument specifies the operation to be performed. RTP_LOOKUP to lookup the current priority, and RTP_SET to set the priority. The pid argument specifies the process to be used, 0 for the current process. The *rtp argument is a pointer to a struct rtprio which is used to specify the priority and priority type. This structure has the following form: struct rtprio { u_short type; u_short prio; }; The value of the type field may be RTP_PRIO_REALTIME for realtime priorities, RTP_PRIO_NORMAL for normal priorities, and RTP_PRIO_IDLE for idle priorities. The priority specified by the prio field ranges between 0 and RTP_PRIO_MAX (usually 31). 0 is the highest possible priority. Realtime and idle priority is inherited through fork() and exec(). A realtime process can only be preempted by a process of equal or higher priority, or by an interrupt; idle priority processes will run only when no other real/normal priority process is runnable. Higher real/idle priority processes preempt lower real/idle priority processes. Processes of equal real/idle priority are run round-robin.
The rtprio() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
The rtprio() system call will fail if [EINVAL] The specified prio was out of range. [EPERM] The calling process is not allowed to set the realtime priority. Only root is allowed to change the realtime priority of any process, and non-root may only change the idle priority of the current process. [ESRCH] The specified process was not found.


nice(1), ps(1), rtprio(1), setpriority(2), nice(3), renice(8)


The original author was Henrik Vestergaard Draboel <hvd@terry.ping.dk>. This implementation in FreeBSD was substantially rewritten by David Greenman. RTPRIO(2)

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