code: def WaitForThreadsToRegister(coord, num_threads):
      while True:
          with coord._lock:
              if len(coord._registered_threads) == num_threads:
                  break
          time.sleep(0.001)
  
imports: import sys
  import threading
  import time
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.platform import test
  from tensorflow.python.training import coordinator
label_desc: Use image node_id 5 for calling a global function with example usage: WaitForThreadsToRegister(coord, num_threads) without return types