sched_setparam(2) — Linux manual page


SCHED_SETPARAM(2)         Linux Programmer's Manual        SCHED_SETPARAM(2)

NAME         top

       sched_setparam, sched_getparam - set and get scheduling parameters

SYNOPSIS         top

       #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         top

       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

       For a discussion of the privileges and resource limits related to
       scheduling priority and policy, see sched(7).

       POSIX systems on which sched_setparam() and sched_getparam() are
       available define _POSIX_PRIORITY_SCHEDULING in <unistd.h>.

RETURN VALUE         top

       On success, sched_setparam() and sched_getparam() return 0.  On
       error, -1 is returned, and errno is set appropriately.

ERRORS         top

       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
              privileges (Linux: does not have the CAP_SYS_NICE capability).

       ESRCH  The thread whose ID is pid could not be found.

CONFORMING TO         top

       POSIX.1-2001, POSIX.1-2008.

SEE ALSO         top

       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)

COLOPHON         top

       This page is part of release 5.09 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at

Linux                            2019-10-10                SCHED_SETPARAM(2)

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