enqueue_timestamp(smartlist_t *timestamps_u64, uint64_t timestamp_usec)
{
  uint64_t *timestamp_ptr = tor_malloc(sizeof(uint64_t));
  *timestamp_ptr = timestamp_usec;

  smartlist_add(timestamps_u64, timestamp_ptr);
}
enqueue_timestamp(smartlist_t *timestamps_u64, uint64_t timestamp_usec)
{
  uint64_t *timestamp_ptr = tor_malloc(sizeof(uint64_t));
  *timestamp_ptr = timestamp_usec;

  smartlist_add(timestamps_u64, timestamp_ptr);
}