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# ch12/example8.py

import threading

import time

class Spouse(threading.Thread):

def __init__(self, name, partner):

threading.Thread.__init__(self)

self.name = name

self.partner = partner

self.hungry = True

def run(self):

while self.hungry:

print('%s is hungry and wants to eat.' % self.name)

if self.partner.hungry:

print('%s is waiting for their partner to eat first...' % self.name)

else:

with fork:

print('%s has stared eating.' % self.name)

time.sleep(5)

print('%s is now full.' % self.name)

self.hungry = False

fork = threading.Lock()

partner1 = Spouse('Wife', None)

partner2 = Spouse('Husband', partner1)

partner1.partner = partner2

partner1.start()

partner2.start()

partner1.join()

partner2.join()

print('Finished.')