sched_rr_get_interval(3)sched_rr_get_interval(3)NAMEsched_rr_get_interval - Returns the current quantum for process execu‐
tion under the SCHED_RR policy (P1003.1b)
SYNOPSIS
#include <sched.h>
int sched_rr_get_interval ( pid_t pid, struct timespec *interval);
LIBRARY
Realtime Library (librt.so, librt.a)
PARAMETERS
Specifies the ID of the process for which the quantum is to be
returned. Specifies the location to receive the current quantum for
process execution under the SCHED_RR scheduling policy.
DESCRIPTION
The sched_rr_get_interval function updates the timespec structure ref‐
erenced by the interval argument to contain the current quantum for the
process executing under the SCHED_RR policy. If a process running under
the round-robin scheduling policy runs without blocking or yielding for
more than this amount of time, it may be preempted by another runnable
process (at the same priority).
If the PID argument is zero, the current execution time limit for the
calling process is returned.
No special privileges are needed to use the sched_rr_get_interval func‐
tion.
RETURN VALUES
On a successful call, a value of 0 (zero) is returned. On an unsuccess‐
ful call, a value of -1 is returned and errno is set to indicate the
error.
ERRORS
The sched_rr_get_interval fails under the following condition: The
value of the pid parameter does not indicate an existing process.
SEE ALSO
Functions: sched_getparam(3), sched_getscheduler(3), sched_setparam(3),
sched_setscheduler(3)
Guide to Realtime Programming
sched_rr_get_interval(3)
