[英]Allow process to finish rather than be interrupted when SIGTERM is used in Python 3
我正在开发一些代码,当从UNIX中的命令行发送sigterm信号时,需要正常关闭。 我发现这个示例https://stackoverflow.com/a/31464349/7019148效果很好,但是存在一个问题。
码:
import signal
import time
class GracefulKiller:
def __init__(self):
signal.signal(signal.SIGTERM, self.exit_gracefully)
self.kill_now = False
def exit_gracefully(self, signum, frame):
self.kill_now = True
def run_something(self):
print("starting")
time.sleep(5)
print("ending")
if __name__ == '__main__':
killer = GracefulKiller()
print(os.getpid())
while True:
killer.run_something()
if killer.kill_now:
break
print("End of the program. I was killed gracefully :)")
当您通过kill命令kill -15 <pid>
,run_something方法被中断,进程被正常终止。 但是,是否有一种方法可以使run_something方法在终止进程之前完成? 即防止打扰?
所需的输出:
>>> starting
*kill executed during the middle sleep*
>>> ending
>>> End of the program. I was killed gracefully :)
我的用例是,它将变成一个下载脚本,如果我想终止该过程,我希望该过程在终止之前完成下载...
即使捕获到退出信号, thread.join()
等到线程完成。
import threading
import Queue
import time
def download_for(seconds=5):
for i in range(seconds):
print("downloading...")
time.sleep(1)
print("finished download")
download_thread = threading.Thread(target=download_for, args=(3,))
download_thread.start()
# this waits till the thread finishes even if an exit signal was received
download_thread.join()
# this would just stop the download midway
# download_for(seconds=5)
答案在原始问题中。 我只是把这个留给以后的Google搜索者。
我从来没有遇到过任何问题,我的终端只是在执行kill
命令后打印“结束”时遇到了问题。
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