[英]How to stop background thread in Python
Here is the code snippet for illustration purpose. 以下是用于说明目的的代码段。 C1.infinite_loop() method is running as background thread.
C1.infinite_loop()方法作为后台线程运行。 I want to make sure if somebody presses Ctrl+C then terminate the program gracefully.
我想确定是否有人按下Ctrl + C然后优雅地终止程序。 What method do i need to override and where to handle Ctrl+C signal ?
我需要覆盖什么方法以及在哪里处理Ctrl + C信号? I am thinking to set a flag when Ctrl+C is generated and periodically check inside C1.infinite_loop.
我想在生成Ctrl + C时设置一个标志,并定期检查C1.infinite_loop。 If flag is true then come out of the loop ?
如果flag为true则退出循环? Is this right approach or do you suggest something else ?
这是正确的方法还是你建议别的吗?
import time
import random
from threading import Thread
class C1:
def __init__(self):
self.list = list()
def infinite_loop(self):
while True:
self.list.append(random.randint(1,10))
time.sleep(2)
class C2:
def __init__(self):
print('inside C2 init')
self.c1 = C1()
def main(self):
self.bg_th = Thread(target=self.c1.infinite_loop)
self.bg_th.start()
def disp(self):
print(self.c1.list)
c2 = C2()
c2.main()
time.sleep(2)
c2.disp()
c2.bg_th.join()
One more question. 还有一个问题。 List is shared between two threads here.
列表在这里的两个线程之间共享。 C2 is reading and C1 is writing.
C2正在读取,C1正在写入。 Do i still need to use lock in such a case ?
在这种情况下我还需要使用锁吗?
This uses flags and signals to terminate the infinite loop 这使用标志和信号来终止无限循环
#!/usr/bin/env python
import signal
import sys
import time
import random
from threading import Thread
class C1:
def __init__(self):
signal.signal(signal.SIGINT,self.signal_handler)
self.keepgoing = True
self.list = list()
def infinite_loop(self):
while self.keepgoing:
self.list.append(random.randint(1,10))
time.sleep(2)
def signal_handler(self, sig, frame):
print('You pressed Ctrl+C!')
self.keepgoing = False
class C2:
def __init__(self):
print('inside C2 init')
self.c1 = C1()
def main(self):
self.bg_th = Thread(target=self.c1.infinite_loop)
self.bg_th.start()
def disp(self):
print(self.c1.list)
c2 = C2()
c2.main()
time.sleep(2)
c2.disp()
c2.bg_th.join()
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