code: def barrier(
      store,
      rank: int,
      world_size: int,
      key_prefix: str,
      barrier_timeout: float = 300,
  ) -> None:
      """
      A global lock between agents.
  
      Note: Since the data is not removed from the store, the barrier can be used
          once per unique ``key_prefix``.
      """
      data = f"{rank}".encode()
      synchronize(
          store, data, rank, world_size, key_prefix, barrier_timeout
      )
  
imports: from datetime import timedelta
  from typing import List
label_desc: Use image node_id 3 for calling a global function with example usage: barrier(store, rank, world_size, key_prefix, barrier_timeout) without return types