sched_setparam(2) System Calls Manual sched_setparam(2)
NAME
sched_setparam, sched_getparam - set and get scheduling parameters
LIBRARY
Standard C library (libc, -lc)
SYNOPSIS
#include <sched.h>
int sched_setparam(pid_t pid, const struct sched_param *param);
int sched_getparam(pid_t pid, struct sched_param *param);
struct sched_param {
...
int sched_priority;
...
};
DESCRIPTION
sched_setparam() sets the scheduling parameters associated with the
scheduling policy for the thread whose thread ID is specified in pid.
If pid is zero, then the parameters of the calling thread are set. The
interpretation of the argument param depends on the scheduling policy of
the thread identified by pid. See sched(7) for a description of the
scheduling policies supported under Linux.
sched_getparam() retrieves the scheduling parameters for the thread
identified by pid. If pid is zero, then the parameters of the calling
thread are retrieved.
sched_setparam() checks the validity of param for the scheduling policy
of the thread. The value param->sched_priority must lie within the
range given by sched_get_priority_min(2) and sched_get_priority_max(2).
For a discussion of the privileges and resource limits related to sched-
uling priority and policy, see sched(7).
POSIX systems on which sched_setparam() and sched_getparam() are avail-
able define _POSIX_PRIORITY_SCHEDULING in <unistd.h>.
RETURN VALUE
On success, sched_setparam() and sched_getparam() return 0. On error,
-1 is returned, and errno is set to indicate the error.
ERRORS
EINVAL Invalid arguments: param is NULL or pid is negative
EINVAL (sched_setparam()) The argument param does not make sense for the
current scheduling policy.
EPERM (sched_setparam()) The caller does not have appropriate privi-
leges (Linux: does not have the CAP_SYS_NICE capability).
ESRCH The thread whose ID is pid could not be found.
STANDARDS
POSIX.1-2008.
HISTORY
POSIX.1-2001.
SEE ALSO
getpriority(2), gettid(2), nice(2), sched_get_priority_max(2),
sched_get_priority_min(2), sched_getaffinity(2), sched_getscheduler(2),
sched_setaffinity(2), sched_setattr(2), sched_setscheduler(2),
setpriority(2), capabilities(7), sched(7)
Linux man-pages 6.9.1 2024-05-02 sched_setparam(2)
Generated by dwww version 1.16 on Tue Dec 16 03:58:51 CET 2025.