threading ---- python multi-threading Python 多线程

Wed, 17 Jun 2020 00:00:00 +0000

强制终止线程

https://blog.csdn.net/A18373279153/article/details/80050177?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-2.nonecase&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-2.nonecase

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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():
 while True:
 print('-------')
 # time.sleep(0.5)
 pass


if __name__ == "__main__":
 t = threading.Thread(target=test)
 t.start()
 time.sleep(5.2)
 print("main thread sleep finish")
 stop_thread(t)

获取返回值

https://blog.csdn.net/it_is_arlon/article/details/86594416

multiprocessing ---- python 多进程

Sun, 07 Jul 2019 00:00:00 +0000

笔记目的

python3 多进程学习笔记

Manager 变量陷阱

https://www.jianshu.com/p/52676b93430d

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 # Manager对象无法监测到它引用的可变对象值的修改，
 # 需要通过触发__setitem__方法来让它获得通知
 from multiprocessing import Process, Manager

 manager = Manager()
 m = manager.list()
 m.append({'id':1})

 def test():
hack = m[0]
hack['id'] = 2
m[0] = hack

 p = Process(target=test)
 p.start()
 p.join()
 print(m[0])

Concurrent on Sawyer Zheng's Blog

threading ---- python multi-threading Python 多线程

强制终止线程

获取返回值

multiprocessing ---- python 多进程

笔记目的

python3 多进程学习笔记

Manager 变量陷阱

Pool

Queue

在 Pool 中不能直接使用，

解决方法：