NAME

       sched_setparam, sched_getparam - set and get scheduling parameters

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 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

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

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

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

CONFORMING TO

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

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)

COLOPHON

       This page is part of release 5.10 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
       https://www.kernel.org/doc/man-pages/.