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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 identi-
       fied 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_setscheduler(2)
       for a description of the scheduling policies supported 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  process.   The value
       param->sched_priority must lie  within  the  range  given  by  sched_get_priority_min(2)  and  sched_get_prior-
       ity_max(2).

       For  a  discussion  of  the  privileges  and  resource  limits  related  to scheduling priority and policy, see
       sched_setscheduler(2).

       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 appro-
       priately.

ERRORS
       EINVAL The argument param does not make sense for the current scheduling policy.

       EPERM  The calling process does not have appropriate privileges (Linux: does not have the CAP_SYS_NICE capabil-
              ity).

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

CONFORMING TO
       POSIX.1-2001.

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), setpriority(2), capabilities(7)

       Programming for the  real  world  -  POSIX.4  by  Bill  O.  Gallmeister,  O'Reilly  &  Associates,  Inc.,  ISBN
       1-56592-074-0

COLOPHON
       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2006-03-23                 SCHED_SETPARAM(2)