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



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 process identified by pid.  If pid is zero, then the parameters of the calling process
       are set.  The interpretation of the argument param depends on the scheduling policy of the
       process identified by pid.  See sched(7) for a description of the scheduling policies sup‐
       ported under Linux.

       sched_getparam()  retrieves  the  scheduling parameters for the process identified by pid.
       If pid is zero, then the parameters of the calling process 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_prior‐
       ity_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 schedul‐
              ing policy.

       EPERM  (sched_setparam()) The calling process does not have appropriate privileges (Linux:
              does not have the CAP_SYS_NICE capability).

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

CONFORMING TO
       POSIX.1-2001.

NOTES
       Scheduling parameters are in fact per-thread attributes on Linux; see sched(7).

SEE ALSO
       getpriority(2), nice(2), sched_get_priority_max(2), sched_get_priority_min(2),
       sched_getaffinity(2), sched_getscheduler(2), sched_setaffinity(2), sched_setscheduler(2),
       sched_setattr(2), setpriority(2), capabilities(7), sched(7)

COLOPHON
       This page is part of release 3.74 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 http://www.kernel.org/doc/man-pages/.



Linux                                       2014-05-11                          SCHED_SETPARAM(2)