python在一个线程中杀死另外一个线程

python线程没有提供abort方法，所以需要我们自己实现以下杀死线程：

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)

使用例子：

>>> 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 

试了一下，很不错，只是在要kill的线程中如果有time.sleep()时，好像工作不正常，没有找出真正的原因是什么。已经是很强大了。哈哈。

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