code: def test_watch_requires_lock_to_run():
      start = time()
  
      stop_profiling_called = threading.Event()
      profiling_thread = None
  
      def stop_profiling():
          if not stop_profiling_called.is_set():  # Run setup code
              nonlocal profiling_thread
              nonlocal start
              profiling_thread = threading.current_thread()
              start = time()
              stop_profiling_called.set()
          return time() > start + 0.500
  
      release_lock = threading.Event()
  
      def block_lock():
          with lock:
              release_lock.wait()
  
      start_threads = threading.active_count()
  
      # Block the lock over the entire duration of watch
      blocking_thread = threading.Thread(
          target=block_lock, name="Block Lock"
      )
      blocking_thread.daemon = True
  
      try:
          blocking_thread.start()
  
          log = watch(
              interval="10ms", cycle="50ms", stop=stop_profiling
          )
  
          start = time()  # wait until thread starts up
          while threading.active_count() < start_threads + 2:
              assert time() < start + 2
              sleep(0.01)
  
          sleep(0.5)
          assert len(log) == 0
          release_lock.set()
      finally:
          release_lock.set()
          stop_profiling_called.wait()
          blocking_thread.join()
          profiling_thread.join()
  
imports: from __future__ import annotations
  import dataclasses
  import sys
  import threading
  from collections.abc import Iterator, Sequence
  from time import sleep
  import pytest
  from tlz import first
  from distributed.compatibility import WINDOWS
  from distributed.metrics import time
  from distributed.profile import call_stack, create, identifier, info_frame, ll_get_stack, llprocess, lock, merge, plot_data, process, watch
label_desc: Use image node_id 8 for calling a global function with example usage: test_watch_requires_lock_to_run() and returns: unknown