#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/resource.h>
void *thread(void *num)
{
 int i=*((int *) num);
 setpriority(PRIO_PROCESS,getpid(),i);
 sleep(rand()%(i+1));
 printf ("Thread #%d working hard with priority %d!\n",i,getpriority(PRIO_PROCESS,getpid()));
 return(NULL);
}
int main (void)
{
 pthread_t tid[10];
 int i;
 for(i=0;i<10; i++)
 {
  printf("Starting %dth thread\n",i);
  pthread_create(&tid[i], NULL, thread, &i);
 }
 printf("All threads started!\n");
 if (pthread_join(tid[0], NULL)) {
  for(i=1;i<10; i++)
 {
  pthread_cancel(tid[i]);
 } 
 }
 printf ("All threads stopped!\n");
 return (0);
}