sched_setparam(2)



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 current process are set. The interpretation
       of the parameter 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 current
       process are retrieved.

       sched_setparam() checks the validity of param for the scheduling policy
       of the process. The parameter 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_setscheduler(2).

       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 appropriately.

ERRORS
       EINVAL The parameter param does not make sense for the current schedul-
              ing policy.

       EPERM  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.

SEE ALSO
       getpriority(2),  nice(2),  sched_get_priority_max(2),  sched_get_prior-
       ity_min(2),         sched_getaffinity(2),        sched_getscheduler(2),
       sched_setaffinity(2), sched_setscheduler(2), setpriority(2),  capabili-
       ties(7)

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

Linux 2.6.16                      2006-03-23                 SCHED_SETPARAM(2)

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