pthread_attr_setschedparam(3P)pthread_attr_setschedparam(3P)NAME
pthread_attr_setschedparam, pthread_attr_getschedparam - manage thread
scheduling priority attributes
C SYNOPSIS
#include <pthread.h>
int pthread_attr_setschedparam(pthread_attr_t *attr,
const struct sched_param *param);
int pthread_attr_getschedparam(const pthread_attr_t *attr,
struct sched_param *oparam);
DESCRIPTION
Scheduling parameters exist to implement scheduling policies [see
pthread_attr_setschedpolicy()]. The sched_priority member of the
sched_param structure is a positive integer number (higher values
indicate greater importance). Priority limits should be retrieved using
the interfaces sched_get_priority_min() and sched_get_priority_max().
The default scheduling priority is the minimum for the policy. A
portable application should not assume more than 32 distinct priorities.
The pthread_attr_setschedparam() function sets the thread scheduling
parameters attribute in the object attr, from the values in param. In
order to use the scheduling parameters from the attribute object the
inherit attribute must be PTHREAD_EXPLICIT_SCHED (this is the default)
[see pthread_attr_setinheritsched()]. The current scheduling parameters
for the attribute object attr, are returned via the oparam parameter of
pthread_attr_getschedparam().
DIAGNOSTICS
On success pthread_attr_setschedparam() returns zero; otherwise an error
number is returned:
[EINVAL] The value of param is out of range.
pthread_attr_getschedparam() always returns zero.
SEE ALSOpthread_attr_setinheritsched(3P), pthread_attr_setschedpolicy(3P),
pthread_attr_setscope(3P), sched_get_priority_max(3P),
sched_get_priority_min(3P).
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