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

void *hello(void *arg) {
  printf("hello world\n");
}

int main() {
  pthread_t thread_block;
  void *status;

  if (pthread_create(&thread_block, NULL, hello, NULL) != 0) {
    perror("pthread_create");
    exit(1);
  }

  if (pthread_join(thread_block, &status) != 0) {
    perror("pthread_join");
    exit(1);
  }

  return 0;
}