11.5.c

#include <pthread.h>
#include "apue.h"

void *thr_fn1(void *arg) {
  printf("thread 1 returning\n");
  return ((void *)1);
}

void *thr_fn2(void *arg) {
  printf("thread 2 exiting\n");
  pthread_exit((void *)2);
}

int main() {
  int err;
  pthread_t tid1, tid2;
  void *tret;

  err = pthread_create(&tid1, NULL, thr_fn1, NULL);
  if (err != 0) {
    err_exit(err, "can't create thread 1");
  }
  err = pthread_create(&tid2, NULL, thr_fn2, NULL);
  if (err != 0) {
    err_exit(err, "can't create thread 2");
  }
  err = pthread_join(tid1, &tret);
  if (err != 0) {
    err_exit(err, "can't join with thread 1");
  }
  printf("thread 1 exit code %ld\n", (long)tret);
  err = pthread_join(tid2, &tret);
  if (err != 0) {
    err_exit(err, "can't join with thread 2");
  }
  printf("thread 2 exit code %ld\n", (long)tret);
  exit(0);
}