code
from threading import Thread
import os,time
n=100
def work():
global n
temp=n
time.sleep(0.1)
n=temp-1
l=[]
for i in range(100):
p=Thread(target=work)
l.append(p)
p.start()
for p in l:
p.join()
print(n) #结果可能为99
outputs
macname@MacdeMacBook-Pro py % python3 cccccc.py 99 macname@MacdeMacBook-Pro py %
由于所有线程初始值都是100，所以最后结果为99
加入线程锁后
from threading import Thread, Lock
import os, time
n = 100
def work():
global n
lock.acquire()
temp = n
time.sleep(0.1)
n = temp - 1
lock.release()
if __name__ == '__main__':
lock = Lock()
l = []
for i in range(100):
p = Thread(target=work)
l.append(p)
p.start()
for p in l:
p.join()
print(n) #0
outputs
macname@MacdeMacBook-Pro py % python3 cccccc.py 0 macname@MacdeMacBook-Pro py %
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