NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

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 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 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 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         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 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         top

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

NOTES         top

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

SEE ALSO         top

       getpriority(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

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Linux                            2016-10-08                SCHED_SETPARAM(2)