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# ch15/example2.py

import time

import threading

COUNT = 50000000

def countdown(n):

while n > 0:

n -= 1

###########################################################################

start = time.time()

countdown(COUNT)

print('Sequential program finished.')

print(f'Took {time.time() - start : .2f} seconds.')

###########################################################################

thread1 = threading.Thread(target=countdown, args=(COUNT // 2,))

thread2 = threading.Thread(target=countdown, args=(COUNT // 2,))

start = time.time()

thread1.start()

thread2.start()

thread1.join()

thread2.join()

print('Concurrent program finished.')

print(f'Took {time.time() - start : .2f} seconds.')