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

/* Prints x’s to stderr. The parameter is unused. Does not return. */

void* print_xs (void* unused)
{
 while (1)
 fputc (‘x’, stderr);
 return NULL;
}

/* The main program. */

int main ()
{
 
 pthread_t thread_id;
 
 /* Create a new thread. The new thread will run the print_xs function. */

 pthread_create (&thread_id, NULL, &print_xs, NULL);
 
 /* Print o’s continuously to stderr. */

 while (1)
  fputc (‘o’, stderr);
  return 0;

}