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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(7) for a description of the scheduling policies sup‐
ported 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_prior‐
ity_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 appropriately.
ERRORS
EINVAL Invalid arguments: param is NULL or pid is negative
EINVAL (sched_setparam()) The argument param does not make sense for the current schedul‐
ing 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.
CONFORMING TO
POSIX.1-2001.
NOTES
Scheduling parameters are in fact per-thread attributes on Linux; see sched(7).
SEE ALSO
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),
sched_setattr(2), setpriority(2), capabilities(7), sched(7)
COLOPHON
This page is part of release 3.74 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 http://www.kernel.org/doc/man-pages/.
Linux 2014-05-11 SCHED_SETPARAM(2)
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