Python 为threading.Thread添加 terminate

import threading
import inspect
import ctypes

def _async_raise(tid, exc_type):
    """raises the exception, performs cleanup if needed"""
    if not inspect.isclass(exc_type):
        raise TypeError("Only types can be raised (not instances)")
    res = ctypes.pythonapi.PyThreadState_SetAsyncExc(tid, ctypes.py_object(exc_type))
    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, 0)
        raise SystemError("PyThreadState_SetAsyncExc failed")

class Thread(threading.Thread):
    def raise_exc(self, exc_type):
        """raises the given exception type in the context of this thread"""
        _async_raise(ctypes.c_long(self.ident), exc_type)

    def terminate(self):
        """raises SystemExit in the context of the given thread, which should
        cause the thread to exit silently (unless caught)"""
        self.raise_exc(SystemExit)