#!/usr/bin/env python
     # encoding: utf-8
     #
     # Copyright (c) 2008 Doug Hellmann All rights reserved.
     #
     """Using a Condition to control sequencing between threads.
     """
     #end_pymotw_header
     import logging
     import threading
     import time
     
     logging.basicConfig(level=logging.DEBUG,
                         format='%(asctime)s (%(threadName)-2s) %(message)s',
                         )
     
     def consumer(cond):
         """wait for the condition and use the resource"""
         logging.debug('Starting consumer thread')
         t = threading.currentThread()
         with cond:
             cond.wait()
             logging.debug('Resource is available to consumer')
     
     def producer(cond):
         """set up the resource to be used by the consumer"""
         logging.debug('Starting producer thread')
         with cond:
             logging.debug('Making resource available')
             cond.notifyAll()
     
     condition = threading.Condition()
     c1 = threading.Thread(name='c1', target=consumer, args=(condition,))
     c2 = threading.Thread(name='c2', target=consumer, args=(condition,))
     p = threading.Thread(name='p', target=producer, args=(condition,))
     
     c1.start()
     time.sleep(2)
     c2.start()
     time.sleep(2)
     p.start()