'Some pre job-processing tasks, like update progress bar.
:param CFGJob job: The CFGJob instance.
:return: None'

def _pre_job_handling(self, job):

    self._deregister_analysis_job(job.func_addr, job)
    if (self._show_progressbar or self._progress_callback):
        max_percentage_stage_1 = 50.0
        percentage = ((self._seg_list.occupied_size * max_percentage_stage_1) / self._exec_mem_region_size)
        if (percentage > max_percentage_stage_1):
            percentage = max_percentage_stage_1
        self._update_progress(percentage)
