class_docstr: A Worker manager for synthetic functions. Mostly to be used in simulations. 
docstr: Returns true if all workers are free. 
docstr_tok: ["Returns","true","if","all","workers","are","free","."]
code: def all_workers_are_free(self):
      """Returns true if all workers are free."""
      return self.worker_pipe[-1][-1]
  
imports: from __future__ import print_function
  from __future__ import division
  from argparse import Namespace
  from multiprocessing import Process
  import numpy
  import os
  import pickle
  import shutil
  import time
  from .exd_utils import EVAL_ERROR_CODE
label_desc: Use image node_id 6 for calling the SyntheticWorkerManager obj's underlying member method code with example usage: obj.all_workers_are_free() and returns: self