code: def pickle_dump(self):
          
          if self.has_chrooted:
              warnings.warn("Cannot pickle_dump since we have chrooted from %s" % self.has_chrooted)
              return -1
  
          #if self.in_spectator_mode:
          #    warnings.warn("Cannot pickle_dump since flow is in_spectator_mode")
          #    return -2
  
          protocol = self.pickle_protocol
  
          # Atomic transaction with FileLock.
          with FileLock(self.pickle_file):
              with AtomicFile(self.pickle_file, mode="wb") as fh:
                  pmg_pickle_dump(self, fh, protocol=protocol)
  
          return 0
docs: Save the status of the object in pickle format.
          Returns 0 if success