glibc/linuxthreads/Examples/ex7.c

/* This is a test of the special shutdown that occurs
   when all threads, including the main one, call
   pthread_exit(). It demonstrates that atexit
   handlers are properly called, and that the
   output is properly flushed even when stdout is
   redirected to a file, and therefore fully buffered. */

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

#define NTHREADS 20	/* number of threads */

static void *thread(void *arg)
{
  printf("thread terminating\n");
  return 0;
}

void cleanup(void)
{
  printf("atexit handler called\n");
}

int main(void)
{
  int i;

  atexit(cleanup);

  for (i = 0; i < NTHREADS; i++) {
    pthread_t id;
    if (pthread_create(&id, 0, thread, 0) != 0) {
      fprintf(stderr, "pthread_create failed\n");
      abort();
    }
  }

  pthread_exit(0);
}