code: def _AbortJoin(self, timeout=None):
      
      for pid, process in iter(self._processes_per_pid.items()):
        logger.debug('Waiting for process: {0:s} (PID: {1:d}).'.format(
            process.name, pid))
        process.join(timeout=timeout)
        if not process.is_alive():
          logger.debug('Process {0:s} (PID: {1:d}) stopped.'.format(
              process.name, pid))
docs: Aborts all registered processes by joining with the parent process.
  
      Args:
        timeout (int): number of seconds to wait for processes to join, where
            None represents no timeout.