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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
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 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>.
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 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.
POSIX.1-2001, POSIX.1-2008.
Scheduling parameters are in fact per-thread attributes on Linux; see
sched(7).
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)
This page is part of release 4.12 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
https://www.kernel.org/doc/man-pages/.
Linux 2016-10-08 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)