def wait_to_start(self, pids=[]):
        '''
        wait_to_start(self, pids=[])

        Wait for processes to start

        :Parameters:
        * *pids* (`list`) -- list of processes to wait to start

        '''
        actual_pids = self._get_pids(pids)
        return self.wait_for(pids=actual_pids, status_list=process_result_statuses+['in_process'])