sched_setparam(2) — Linux manual page

sched_setparam(2)          System Calls Manual         sched_setparam(2)

NAME

       sched_setparam, sched_getparam - set and get scheduling
       parameters

LIBRARY

       Standard C library (libc, -lc)

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 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>.

RETURN VALUE

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

ERRORS

       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.

STANDARDS

       POSIX.1-2008.

HISTORY

       POSIX.1-2001.

SEE ALSO

       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)

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Linux man-pages 6.9.1          2024-05-02              sched_setparam(2)

Pages that refer to this page: getrlimit(2), gettid(2), sched_get_priority_max(2), sched_setattr(2), sched_setscheduler(2), syscalls(2), posix_spawn(3), capabilities(7), credentials(7), sched(7)

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