code: def shutdown(self, wait=True, timeout=None):
      with threads_lock:
          with self._shutdown_lock:
              self._shutdown = True
              self._work_queue.put(None)
          if timeout is not None:
              deadline = time() + timeout
          if wait:
              for t in self._threads:
                  if timeout is not None:
                      timeout2 = max(deadline - time(), 0)
                  else:
                      timeout2 = None
                  t.join(timeout=timeout2)
  
file_path: distributed/distributed/threadpoolexecutor.py
imports: from __future__ import annotations
  import itertools
  import logging
  import os
  import queue
  import threading
  from distributed import _concurrent_futures_thread
  from distributed.metrics import time
label_desc: Use image node_id 3 for calling the ThreadPoolExecutor obj's underlying member method code with example usage: obj.shutdown(wait, timeout) without return types