How to use the pyuvsim.mpi.world_comm.Barrier function in pyuvsim

return AnalyticBeam(model, **to_set)

        path = beam_model  # beam_model = path to beamfits
        uvb = UVBeam()
        if use_shared_mem and (mpi.world_comm is not None):
            if mpi.rank == 0:
                uvb.read_beamfits(path)
                uvb.peak_normalize()
            for key, attr in uvb.__dict__.items():
                if not isinstance(attr, parameter.UVParameter):
                    continue
                if key == '_data_array':
                    uvb.__dict__[key].value = mpi.shared_mem_bcast(attr.value, root=0)
                else:
                    uvb.__dict__[key].value = mpi.world_comm.bcast(attr.value, root=0)
            mpi.world_comm.Barrier()
        else:
            uvb.read_beamfits(path)
        for key, val in self.uvb_params.items():
            setattr(uvb, key, val)
        uvb.extra_keywords['beam_path'] = path
        return uvb

# Get list of attributes that are set.
        isset = None
        if mpi.rank == root:
            isset = [key for key, value in self.__dict__.items() if value is not None]
        isset = mpi.world_comm.bcast(isset, root=root)

        for key in isset:
            attr = getattr(self, key)
            if key in self.put_in_shared:
                val = mpi.shared_mem_bcast(attr, root=root)
            else:
                val = mpi.world_comm.bcast(attr, root=root)
            if val is not None:
                setattr(self, key, val)

        mpi.world_comm.Barrier()