python中threading方式创建的线程的终止

对于采用threading方式创建的线程，没有提供推出的方法，只能是等线程函数结束。但是有些情况需要强制结束，这就比较麻烦了。

有如下实现方式：

import threading
import inspect
import ctypes 

def _async_raise(tid, exctype):
    """raises the exception, performs cleanup if needed"""
    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)

当然也可参考http://huangliangnumber1.blog.163.com/blog/static/4781174820114125404510/

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)

其实两者是一样的。需要注意的是在python2.6后threading.Thread中有变量ident直接作为线程id。