code: def set_limits(self, limits):
          
  
          # First task, build the checksum of the new limits
          chksum = hashlib.md5()  # sufficient for our purposes
          for lim in limits:
              chksum.update(lim)
          new_sum = chksum.hexdigest()
  
          # Now install it
          with self.limit_lock:
              if self.limit_sum == new_sum:
                  # No changes
                  return
              self.limit_data = [msgpack.loads(lim) for lim in limits]
              self.limit_sum = new_sum
docs: Set the limit data to the given list of limits.  Limits are
          specified as the raw msgpack string representing the limit.
          Computes the checksum of the limits; if the checksum is
          identical to the current one, no action is taken.