1. 如題，我用subprocess創(chuàng)建了一個子進程，這個進程可能要運行很長時間，所以在linux下可以給父進程注冊了SIGCHLD信號，查資料后大致代碼如下，當(dāng)子進程退出時父進程獲取這個信號進行相應(yīng)處理。但是移植到windows下，并沒有這個信號，需要如何處理呢？
2. 目前關(guān)鍵部分代碼如下：

def exit_hanlder(signum, frame):
    logging.info('receive SIGCHLD')
    try:
        while True:
            cpid, status = os.waitpid(-1, os.WNOHANG)
            if cpid == 0:
                logging.info('no child process was immediately available')
                break
            exitcode = status >> 8
            logging.info('child process %s exit with exitcode %s', cpid, exitcode)
    except OSError as e:
        if e.errno == errno.ECHILD:
            logging.warning('current process has no existing unwaited-for child processes.')
        else:
            raise
    logging.info('handle SIGCHLD end')

signal.signal(signal.SIGCHLD, exit_hanlder)