#!/usr/bin/env python
     # encoding: utf-8
     #
     # Copyright (c) 2008 Doug Hellmann All rights reserved.
     #
     """Using Events to synchronize threads.
     """
     #end_pymotw_header
     
     import logging
     import threading
     import time
     
     logging.basicConfig(level=logging.DEBUG,
                         format='(%(threadName)-10s) %(message)s',
                         )
                         
     def wait_for_event(e):
         """Wait for the event to be set before doing anything"""
         logging.debug('wait_for_event starting')
         event_is_set = e.wait()
         logging.debug('event set: %s', event_is_set)
     
     def wait_for_event_timeout(e, t):
         """Wait t seconds and then timeout"""
         while not e.isSet():
             logging.debug('wait_for_event_timeout starting')
             event_is_set = e.wait(t)
             logging.debug('event set: %s', event_is_set)
             if event_is_set:
                 logging.debug('processing event')
             else:
                 logging.debug('doing other work')
     
     
     e = threading.Event()
     t1 = threading.Thread(name='block', 
                           target=wait_for_event,
                           args=(e,))
     t1.start()
     
     t2 = threading.Thread(name='non-block', 
                           target=wait_for_event_timeout, 
                           args=(e, 2))
     t2.start()
     
     logging.debug('Waiting before calling Event.set()')
     time.sleep(3)
     e.set()
     logging.debug('Event is set')