Function tm_multi

localtime.c:2173–2200

Return TMP, or a thread-specific struct tm * selected by WHICH. */

/* Return TMP, or a thread-specific struct tm * selected by WHICH.  */
static struct tm *
tm_multi(struct tm *tmp, ATTRIBUTE_MAYBE_UNUSED enum tm_multi which)
{
# if THREAD_SAFE && THREAD_TM_MULTI
  /* It is OK to check is_threaded() separately here; even if it
     returns a different value in other places in the caller,
     this function's behavior is still valid.  */
  if (is_threaded()) {
    /* Try to get a thread-specific struct tm *.
       Fall back on TMP if this fails.  */
    static pthread_once_t tm_multi_once = PTHREAD_ONCE_INIT;
    pthread_once(&tm_multi_once, tm_multi_key_init);
    if (!tm_multi_key_err) {
      struct tm *p = pthread_getspecific(tm_multi_key);
      if (!p) {
	p = malloc(N_TM_MULTI * sizeof *p);
	if (p && pthread_setspecific(tm_multi_key, p) != 0) {
	  free(p);
	  p = NULL;
	}
      }
      if (p)
	return &p[which];
    }
  }
# endif
  return tmp;
}

# if NETBSD_INSPIRED
struct tm *