sched_setparam, sched_getparam - set and get scheduling
parameters
SYNOPSIS
#include <sched.h>
int sched_setparam(pid_t pid, const struct sched_param
*p);
int sched_getparam(pid_t pid, struct sched_param *p);
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 current
process are set. The interpretation of the parameter p
depends on the selected policy. Currently, the following
three scheduling policies are supported under Linux:
SCHED_FIFO, SCHED_RR, and SCHED_OTHER.
sched_getparam retrieves the scheduling parameters for the
process identified by pid. If pid is zero, then the param
eters of the current process are retrieved.
sched_setparam checks the validity of p for the scheduling
policy of the process. The parameter p->sched_priority
must lie within the range given by sched_get_priority_min
and sched_get_priority_max.
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, errno is set appropriately.
ERRORS
ESRCH The process whose ID is pid could not be found.
EPERM The calling process does not have appropriate priv
ileges. The process calling sched_setparam needs an
effective uid equal to the euid or uid of the pro
cess identified by pid, or it must be a superuser
process.
scheduling policy.
CONFORMING TO
POSIX.1b (formerly POSIX.4)
SEE ALSO
sched_setscheduler(2), sched_getscheduler(2),
sched_get_priority_max(2), sched_get_priority_min(2),
nice(2), setpriority(2), getpriority(2),
sched_setscheduler(2) has a description of the Linux
scheduling scheme.
Programming for the real world - POSIX.4 by Bill O.
Gallmeister, O'Reilly & Associates, Inc., ISBN
1-56592-074-0
IEEE Std 1003.1b-1993 (POSIX.1b standard)
ISO/IEC 9945-1:1996
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