AdvancedPythonProgramming/Chapter19/example6.py at master · DataHorder/AdvancedPythonProgramming

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import threading

import time

from timeit import default_timer as timer

def thread_a():

print('Thread A is starting...')

print('Thread A waiting to acquire lock A.')

lock_a.acquire()

print('Thread A has acquired lock A, performing some calculation...')

time.sleep(2)

print('Thread A waiting to acquire lock B.')

lock_b.acquire()

print('Thread A has acquired lock B, performing some calculation...')

time.sleep(2)

print('Thread A releasing both locks.')

lock_a.release()

lock_b.release()

def thread_b():

print('Thread B is starting...')

print('Thread B waiting to acquire lock A.')

lock_a.acquire()

print('Thread B has acquired lock A, performing some calculation...')

time.sleep(5)

print('Thread B waiting to acquire lock B.')

lock_b.acquire()

print('Thread B has acquired lock B, performing some calculation...')

time.sleep(5)

print('Thread B releasing both locks.')

lock_b.release()

lock_a.release()

lock_a = threading.Lock()

lock_b = threading.Lock()

thread1 = threading.Thread(target=thread_a)

thread2 = threading.Thread(target=thread_b)

start = timer()

thread1.start()

thread1.join()

thread2.start()

thread2.join()

print('Took %.2f seconds.' % (timer() - start))

print('Finished.')