pthread_attr_setschedparam Syntax

int pthread_attr_setschedparam(pthread_attr_t *restrict tattr,
         const struct sched_param *restrict param);

#include <pthread.h> 
pthread_attr_t tattr; 
int ret; 
int newprio; 
sched_param param; 
newprio = 30; 
/* set the priority; others are unchanged */ 
param.sched_priority = newprio; 
/* set the new scheduling param */ 
ret = pthread_attr_setschedparam (&tattr, &param); 

Scheduling parameters are defined in the param structure. Only the priority parameter is supported.