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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_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_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 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 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 capability).

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

CONFORMING TO         top

       POSIX.1-2001.

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_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         top

       This page is part of release 3.32 of the Linux man-pages project.  A
       description of the project, and information about reporting bugs, can be found
       at http://www.kernel.org/doc/man-pages/.

Linux                                 2006-03-23                    SCHED_SETPARAM(2)

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