code: def global_barrier(timeout: Optional[int] = None) -> None:
      r"""Block until all local and remote RPC processes."""
      try:
          global_all_gather(obj=None, timeout=timeout)
      except RuntimeError:
          logging.error("Failed to respond to global barrier")
  
imports: import logging
  import threading
  from abc import ABC, abstractmethod
  from typing import Any, Callable, Dict, List, Optional
  from torch.distributed import rpc
  from torch_geometric.distributed.dist_context import DistContext, DistRole
label_desc: Use image node_id 4 for calling a global function with example usage: global_barrier(timeout) without return types