code: def with_worker_threads(
      n_threads, dbname="foo", n_jobs=sys.maxsize, timeout=10.0
  ):
      """
      Decorator that will run a test with some MongoWorker threads in flight
      """
  
      def newth(ii):
          return threading.Thread(
              target=_worker_thread_fn,
              args=(("hostname", ii), n_jobs, timeout, dbname),
          )
  
      def deco(f):
          def wrapper(*args, **kwargs):
              # --start some threads
              threads = list(map(newth, list(range(n_threads))))
              [th.start() for th in threads]
              try:
                  return f(*args, **kwargs)
              finally:
                  [th.join() for th in threads]
  
          wrapper.__name__ = f.__name__  # -- nose requires test in name
          return wrapper
  
      return deco
  
imports: import pickle
  import os
  import signal
  import subprocess
  import sys
  import traceback
  import threading
  import time
  import unittest
  import numpy
  import nose
  import nose.plugins.skip
  from hyperopt.base import JOB_STATE_DONE, STATUS_OK
  from hyperopt.mongoexp import parse_url
  from hyperopt.mongoexp import MongoTrials
  from hyperopt.mongoexp import MongoWorker
  from hyperopt.mongoexp import ReserveTimeout
  from hyperopt.mongoexp import as_mongo_str
  from hyperopt.mongoexp import main_worker_helper
  from hyperopt.mongoexp import MongoJobs
  from hyperopt.fmin import fmin
  from hyperopt import hp, rand
  import hyperopt.tests.test_base
  from hyperopt.tests.unit.test_domains import gauss_wave2
label_desc: Use image node_id 5 for calling a global function with example usage: with_worker_threads(n_threads, dbname, n_jobs, timeout) and returns: deco, threading, wrapper, f