Threads Attributes

#include<stdio.h>
#include<unistd.h>
#include<pthread.h>
  
void *threadfn1(void *p)
{
    puts("thread1");
    return NULL;
}
  
void *threadfn2(void *p)
{
    puts("thread2");
    return NULL;
}
  
int main()
{
    pthread_t t1,t2,t3;
    pthread_attr_t attr;
    struct sched_param param;
  
    pthread_attr_init(&attr);
    pthread_attr_setschedpolicy(&attr, SCHED_RR);
  
    param.sched_priority = 50;
    pthread_attr_setschedparam(&attr, &param);
  
    pthread_create(&t1,&attr,threadfn1,NULL);
  
    param.sched_priority = 40;
    pthread_attr_setschedparam(&attr, &param);
  
    pthread_create(&t2,&attr,threadfn2,NULL);
    sleep(10);
    puts("end test");
    return 0;
}