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#include <threads.h>
#include <stdlib.h>

/* Global key to the thread-specific storage */
tss_t key;
enum { MAX_THREADS = 3 };

/* ... Other functions are unchanged */

void destructor(void *data) {
  free(data);
}
 
int main(void) {
  thrd_t thread_id[MAX_THREADS];

  /* Create the key before creating the threads */
  if (thrd_success != tss_create(&key, destructor)) {
    /* Handle error */
  }

  /* Create threads that would store specific storage */
  for (size_t i = 0; i < MAX_THREADS; i++) {
    if (thrd_success != thrd_create(&thread_id[i], function, NULL)) {
      /* Handle error */
    }
  }

  for (size_t i = 0; i < MAX_THREADS; i++) {
    if (thrd_success != thrd_join(thread_id[i], NULL)) {
      /* Handle error */
    }
  }

  tss_delete(key);
  return 0;
}