NAME
pthread_setschedparam,
pthread_getschedparam —
thread scheduling parameter
manipulation
LIBRARY
library “libpthread”
SYNOPSIS
#include
<pthread.h>
int
pthread_setschedparam(pthread_t
thread, int policy,
const struct sched_param
*param);
int
pthread_getschedparam(pthread_t
thread, int * restrict
policy, struct
sched_param * restrict param);
DESCRIPTION
Thepthread_setschedparam()
and
pthread_getschedparam()
functions set and get the scheduling parameters of individual threads. The
scheduling policy for a thread can either be
SCHED_FIFO (first in, first out),
SCHED_RR (round-robin), or
SCHED_OTHER (timesharing). Valid thread priorities
(accessed via param->sched_priority) must be within
the range returned by the
sched_get_priority_min(2) and
sched_get_priority_max(2) system calls.
RETURN VALUES
If successful, these functions return 0. Otherwise, an error number is returned to indicate the error.
ERRORS
The pthread_setschedparam() function will
fail if:
- [
EINVAL] - Invalid value for policy.
- [
ENOTSUP] - Invalid value for scheduling parameters.
- [
ESRCH] - Non-existent thread thread.
The pthread_getschedparam() function will
fail if:
- [
ESRCH] - Non-existent thread thread.
SEE ALSO
STANDARDS
The pthread_setschedparam() and
pthread_getschedparam() functions conform to
Version 2 of the Single UNIX Specification
(“SUSv2”).