SCHED_SETPARAM(2)           Linux Programmer's Manual          SCHED_SETPARAM(2)

       sched_setparam, sched_getparam - set and get scheduling parameters

       #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;

       sched_setparam() sets the scheduling parameters associated with the
       scheduling policy for the thread whose thread ID is specified in pid.  If
       pid is zero, then the parameters of the calling thread are set.  The
       interpretation of the argument param depends on the scheduling policy of
       the thread identified by pid.  See sched(7) for a description of the
       scheduling policies supported under Linux.

       sched_getparam() retrieves the scheduling parameters for the thread
       identified by pid.  If pid is zero, then the parameters of the calling
       thread 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>.

       On success, sched_setparam() and sched_getparam() return 0.  On error, -1
       is returned, and errno is set appropriately.

       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 caller does not have appropriate privileges
              (Linux: does not have the CAP_SYS_NICE capability).

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

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

       getpriority(2), gettid(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)

       This page is part of release 5.10 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at

Linux                              2019-10-10                  SCHED_SETPARAM(2)