python(threading_ex3 lock 线程)

import threading
import time

def run(n):
    global num
    num += 1



num = 0
t_objs = [] #存线程实例
for i in range(50):
    t = threading.Thread(target=run,args=("t-%s" %i ,))
    t.start()
    t_objs.append(t) #为了不阻塞后面线程的启动,不在这里join,先放到一个列表里

for t in t_objs: #循环线程实例列表,等待所有线程执行完毕
    t.join()


print("----------all threads has finished...",threading.current_thread(),threading.active_count())

print("num:",num)

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