[英]Allow process to finish rather than be interrupted when SIGTERM is used in Python 3
我正在開發一些代碼,當從UNIX中的命令行發送sigterm信號時,需要正常關閉。 我發現這個示例https://stackoverflow.com/a/31464349/7019148效果很好,但是存在一個問題。
碼:
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 :)")
當您通過kill命令kill -15 <pid>
,run_something方法被中斷,進程被正常終止。 但是,是否有一種方法可以使run_something方法在終止進程之前完成? 即防止打擾?
所需的輸出:
>>> starting
*kill executed during the middle sleep*
>>> ending
>>> End of the program. I was killed gracefully :)
我的用例是,它將變成一個下載腳本,如果我想終止該過程,我希望該過程在終止之前完成下載...
即使捕獲到退出信號, thread.join()
等到線程完成。
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)
答案在原始問題中。 我只是把這個留給以后的Google搜索者。
我從來沒有遇到過任何問題,我的終端只是在執行kill
命令后打印“結束”時遇到了問題。
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