code: def refresh_lock(lock_file):
      """
      'Refresh' an existing lock by re-writing the file containing the owner's
      unique id, using a new (randomly generated) id, which is also returned.
  
      """
      unique_id = "%s_%s_%s" % (
          os.getpid(),
          "".join([str(random.randint(0, 9)) for i in range(10)]),
          hostname,
      )
      try:
          with open(lock_file, "w") as lock_write:
              lock_write.write(unique_id + "\n")
      except Exception:
          # In some strange case, this happen.  To prevent all tests
          # from failing, we release the lock, but as there is a
          # problem, we still keep the original exception.
          # This way, only 1 test would fail.
          while get_lock.n_lock > 0:
              release_lock()
          _logger.warn(
              "Refreshing lock failed, we release the"
              " lock before raising again the exception"
          )
          raise
      return unique_id
  
imports: from __future__ import absolute_import, print_function, division
  import atexit
  import os
  import socket
  import time
  import logging
  from six import PY3
  from contextlib import contextmanager
  import numpy
  from theano import config
label_desc: Use image node_id 7 for calling a global function with example usage: refresh_lock(lock_file) and returns: unique_id