code: def start_proc_mask_signal(proc):
      
      if not isinstance(proc, list):
          proc = [proc]
  
      with mask_sigint():
          for p in proc:
              if isinstance(p, mp.Process):
                  if sys.version_info < (3, 4) or mp.get_start_method() == 'fork':
                      log_once(
  "Starting a process with 'fork' method is not safe and may consume unnecessary extra memory."
  " Use 'forkserver' method (available after Py3.4) instead if you run into any issues. "
  "See https://docs.python.org/3/library/multiprocessing.html#contexts-and-start-methods",
  'warn')  # noqa
              p.start()
docs: Start process(es) with SIGINT ignored.
  
      Args:
          proc: (mp.Process or list)
  
      Note:
          The signal mask is only applied when called from main thread.