threading module timer object

[.d.hos]

hello all,
I have a multithreading app, and I want to watch each thread with a
timeout function.

currently, I using the the threading modules timer object, and
try:/except: statements, to raise a user defined exception. The user
defined exception is raised after the said timespan passes, but
processing that occurs after catching the exception never happens.

I think i'm fairly close to getting this working, but can't figure out
what i'm doing wrong here. any input?

class workerThread(threading.Thread):
    def __init__(self, queue, threadNo=None):
        self.__queue = queue
        self.__TimeOut = "Thread timed out"
        threading.Thread.__init__(self)

    def flagIt(self):
        raise self.__TimeOut
    
    def run(self):
        try:           
            t = threading.Timer(5.0, self.flagIt)
            t.start()

            #do something here
            self.__queue.put("mission complete")
            
        except self.__TimeOut:
            self.__queue.put("timeout error")

Regards,
.d.hos