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_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 parame-
       ters 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_setsched-
       uler(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 appropriately.

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 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_priority_min(2),  sched_getaffinity(2),  sched_getsched-
       uler(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 3.25 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)