#include <threads.h>

int __pthread_key_create(tss_t*, void (*)(void*));

int tss_create(tss_t* tss, tss_dtor_t dtor) {
  /* Different error returns are possible. C glues them together into
   * just failure notification. Can't be optimized to a tail call,
   * unless thrd_error equals EAGAIN. */
  return __pthread_key_create(tss, dtor) ? thrd_error : thrd_success;
}