code: def shutdown(self, wait=True):
      with self._shutdown_lock:
          self._shutdown = True
          self._work_queue.put(None)
      if wait:
          for t in self._threads:
              t.join()
  
file_path: distributed/distributed/_concurrent_futures_thread.py
imports: from __future__ import annotations
  import atexit
  import itertools
  import os
  import queue
  import threading
  import weakref
  from concurrent.futures import _base
label_desc: Use image node_id 4 for calling the ThreadPoolExecutor obj's underlying member method code with example usage: obj.shutdown(wait) without return types