#include <pthread.h>
#include <sched.h>
#include <stdio.h>

void * task(void * data)
{
 int i;
 for(i=0;i<1000000;i++)
 {
  fprintf(stderr,"%d",*((int *)data));
  sched_yield();
 }
 return((void *)0);
}

int main(void)
{
 int n1=1,n2=2;
 pthread_t t1,t2; void * result;

 if(pthread_create(&t1,(pthread_attr_t *)0,task,&n1))
  { fprintf(stderr,"Pb thread 1\n"); return(1); }

 if(pthread_create(&t2,(pthread_attr_t *)0,task,&n2))
  { fprintf(stderr,"Pb thread 2\n"); return(1); }

 pthread_join(t1,&result); pthread_join(t2,&result);

 return(0);
}