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SCHED_SETPARAM
Section: Linux Programmer's Manual (2)
Updated: 2006-03-23
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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 parameters
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_setscheduler(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_getscheduler(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 3.05 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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