Function lock

localtime.c:130–136

Get a lock. Return 0 on success, a positive errno value on failure, negative if known to be single-threaded so no lock is needed. */

/* Get a lock.  Return 0 on success, a positive errno value on failure,
   negative if known to be single-threaded so no lock is needed.  */
static int
lock(void)
{
  if (!is_threaded())
    return -1;
  return dolock();
}
static void
unlock(bool threaded)
{