強制停止多線程運作
by:授客 QQ：1033553122
#!/usr/bin/env python
# -*- coding:utf-8 -*-
__author__ = 'shouke'
import threading
import time
import inspect
import ctypes
def _async_raise(tid, exctype):
"""raises the exception, performs cleanup if needed"""
tid = ctypes.c_long(tid)
if not inspect.isclass(exctype):
exctype = type(exctype)
res = ctypes.pythonapi.PyThreadState_SetAsyncExc(tid, ctypes.py_object(exctype))
if res == 0:
raise ValueError("invalid thread id")
elif res != 1:
# """if it returns a number greater than one, you're in trouble,
# and you should call it again with exc=NULL to revert the effect"""
ctypes.pythonapi.PyThreadState_SetAsyncExc(tid, None)
raise SystemError("PyThreadState_SetAsyncExc failed")
def stop_thread(thread):
_async_raise(thread.ident, SystemExit)
def test():
try:
while True:
print('-------')
time.sleep(0.5)
except Exception as e:
print('Exception：%s' % e)
finally:
print('stop running test function')
if __name__ == "__main__":
t = threading.Thread(target=test)
t.start()
time.sleep(5)
stop_thread(t)
print("main thread running")
運作結果：
結論：
按上述方法是可以停止多線程的，但是需要注意的地方是，線程退出前，會執行try...finally中的代碼，如果代碼包含了多層try...finally，每一層的finally中的語句都會被執行，如下：
修改代碼如下
try:
while True:
print('-------')
time.sleep(0.5)
except Exception as e:
print('Exception：%s' % e)
finally:
print('stop running test function')
print('outer try')
except Exception:
pass
print('outer try finally')
再次運作，結果
作者：授客
QQ：1033553122
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Git位址：https://gitee.com/ishouke
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