[mod_python] Does mod_python support multi-thread?

import threading
from mylogger import mylogger

class TestThread(threading.Thread):

    def __init__(self.**kwds):
        threading.Thread.__init__(self)

    def run(self):
        mylogger.info("TestThread into running state")
	
def webtest(req):
	req.content_type="text/html"
	tt = TestThread()
	tt.start()
	req.write("<H1>OK</H1>")
	

TestThread's run() is never executed ... what's wrong with the configuration?
Does mod_python support multi-threaded program?