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


void* worker(void* arg) {
  static _Atomic int nb_threads = 0;
  int my_rank = nb_threads++;
  printf("Hello from thread %d\n", my_rank);
  return NULL;
}


int main(int argc, char** argv) {

  pthread_t tid[4];

  for(int i = 0; i<4; i++) {
    pthread_create(&tid[i], NULL, worker, NULL);
  }

  for(int i = 0; i<4; i++) {
    pthread_join(tid[i], NULL);
  }

  return EXIT_SUCCESS;
}