def manager(self, value):
        "Set the manager object in the global _managers dict."
        pid = current_process().ident
        if _managers is None:
            raise RuntimeError("Can not set the manager following a system exit.")
        if pid not in _managers:
            _managers[pid] = value
        else:
            raise Exception("Manager already set for pid %s" % pid)
Set the manager object in the global _managers dict.