lock

import threading

import time

def job1():

global A, lock

lock.acquire()

for i in range(10):

A += 1

lock.release()

def job2():

global A, lock

lock.acquire()

for i in range(10):

A += 10

lock.release()

if __name__ == '__main__':

start1 = time.time()

lock = threading.Lock()

A = 0

t1 = threading.Thread(target=job1)

t2 = threading.Thread(target=job2)

t1.start()

t2.start()

t1.join()

t2.join()

print(A)

end1 = time.time()

print("thread cost:", end1 - start1)

start2 = time.time()

a = 0

for i in range(10):

a += 1

for i in range(10):

a += 10

print(a)

end2 = time.time()

print('normal cost:', end2 - start2)