python中杀死线程

      有时候有这样的需要，在某种情况下，需要在主线程中杀死之前创建的某个线程，可以使用下面的方法，通过调用python内置API，在线程中抛出异常，使线程退出。

import threading
import time
import inspect
import ctypes


def _async_raise(tid, exctype):
    """Raises an exception in the threads with id tid"""
    if not inspect.isclass(exctype):
        raise TypeError("Only types can be raised (not instances)")
    res = ctypes.pythonapi.PyThreadState_SetAsyncExc(ctypes.c_long(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)


class TestThread(threading.Thread):
    def run(self):
        print("begin run the child thread")
        while True:
            print("sleep 1s")
            time.sleep(1)


if __name__ == "__main__":
    print("begin run main thread")
    t = TestThread()
    t.start()
    time.sleep(3)
    stop_thread(t)
    print("main thread end")

这种方法是强制杀死线程，但是如果线程中涉及获取释放锁，可能会导致死锁。

更好的杀死线程的方式是使用退出标记，让线程自己退出，具体可以看我的下一篇博客 ： https://www.cnblogs.com/lucky-heng/p/11991695.html