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
R 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 current process are set.
The interpretation of
the parameter
param depends on the scheduling
policy of the process identified by
R pid .
See
sched_setscheduler(2)
for a description of the scheduling policies supported under Linux.
R sched_getparam ()
retrieves the scheduling parameters for the
process identified by
pid.
If
pid is zero, then the parameters
of the current process are retrieved.
R sched_setparam ()
checks the validity of
param for the scheduling policy of the
process.
The parameter
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
R sched_setparam ()
and
R sched_getparam ()
are available define
_POSIX_PRIORITY_SCHEDULING
in
<unistd.h>.
RETURN VALUE
On success,
R sched_setparam ()
and
R sched_getparam ()
return 0.
On error, -1 is returned, and
errno
is set appropriately.
ERRORS
EINVAL
The parameter 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
Programming for the real world - POSIX.4
by Bill O. Gallmeister, O'Reilly & Associates, Inc., ISBN 1-56592-074-0
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