python在一个线程中杀死另外一个线程

import threading  
import inspect  
import ctypes  

def _async_raise(tid,exctype):
    """raises the exception,performs cleanup if needed"""
    if not inspect.isclass(exctype):
        raise TypeError("Only types can be raised (not instances)")
    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,0)
        raise SystemError("PyThreadState_SetAsyncExc failed")
class Thread(threading.Thread):
    def _get_my_tid(self):
        """determines this (self's) thread id"""
        if not self.isAlive():
            raise threading.ThreadError("the thread is not active")

        # do we have it cached?
        if hasattr(self,"_thread_id"):
            return self._thread_id

        # no,look for it in the _active dict
        for tid,tobj in threading._active.items():
            if tobj is self:
                self._thread_id = tid
                return tid

        raise AssertionError("could not determine the thread's id")
def raise_exc(self,exctype):
        """raises the given exception type in the context of this thread"""
        _async_raise(self._get_my_tid(),exctype)
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)

>>> import time  
>>> from thread2 import Thread  
>>>  
>>> def f():  
...     try:  
...         while True:  
...             time.sleep(0.1)  
...     finally:  
...         print "outta here"  
...  
>>> t = Thread(target = f)  
>>> t.start()  
>>> t.isAlive()  
True  
>>> t.terminate()  
>>> t.join()  
outta here  
>>> t.isAlive()  
False