41 lines
1.3 KiB
Python
41 lines
1.3 KiB
Python
def singleton(cls):
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instance = cls()
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cls.__call__ = lambda self: instance
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return instance
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# def wait_child(signum, frame):
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# logger.debug('receive SIGCHLD')
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# try:
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# while True:
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# # -1 表示任意子进程
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# # os.WNOHANG 表示如果没有可用的需要 wait 退出状态的子进程，立即返回不阻塞
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# cpid, status = os.waitpid(-1, os.WNOHANG)
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# if cpid == 0:
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# logger.debug('no child process was immediately available')
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# break
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# exitcode = status >> 8
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# logger.debug('child process %s exit with exitcode %s', cpid, exitcode)
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# except OSError as e:
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# if e.errno == errno.ECHILD:
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# logger.error('current process has no existing unwaited-for child processes.')
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# else:
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# raise
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# logger.debug('handle SIGCHLD end')
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# def signal_handler(signum, frame):
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# logger.info('收到Terminate信号')
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# raise youtube_dl.utils.DownloadError(signum)
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# def monitoring(q):
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# # signal.signal(signal.SIGCHLD, wait_child)
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# while True:
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# # print('开始监测')
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# pid, file_name = q.get()
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# time.sleep(5)
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# logger.info('获取到{0}，{1}'.format(pid, file_name))
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# t = Thread(target=kill_child_processes, args=(pid, file_name))
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# t.start()
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