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

#define NUM_THREADS 10
#define MSG_LEN 100

struct thread_data {
  char *msg;
};
typedef struct thread_data thread_data_t;

void *PrintHello(void *arg) {
  thread_data_t *td = (thread_data_t *) arg;
  printf("%s", td->msg);
  pthread_exit(NULL);
}

void dienomem() {
  printf("ERROR: No memory?!\n");
  exit(1);
}

int main(void) {
  pthread_t threads[NUM_THREADS];

  for (int t = 0; t < NUM_THREADS; t++) {
    /* printf("Creating thread %d\n", t); */

    thread_data_t *td = malloc(sizeof(thread_data_t));
    if (!td)
      dienomem();
    td->msg = malloc(MSG_LEN);
    if (!td->msg)
      dienomem();

    snprintf(td->msg, MSG_LEN, "Hello, I'm thread %d!\n", t);

    int rc = pthread_create(&threads[t], NULL, PrintHello, (void *) td);
    if (rc) {
      printf("ERROR: return code from pthread_create() is %d\n", rc);
      exit(1);
    }
  }

  pthread_exit(NULL);           /* Wait for the threads to finish. */
}