# __author: "ZXYang"
# date: 2020/5/12
import threading
import time


# from time import time


def addnum():
    global num

    lock.acquire()  # 加锁，计算完后，进行下个线程，比t.join效果更好   ==> 先占着cpu
    # print('ok')

    # time.sleep(10)                 #  时间太长，下一个线程会覆盖，数据被覆盖（在 -1 之前）
    # time.sleep(0.0001)
    num -= 1

    lock.release()  # 释放


num = 100

thread_list = []
# lock = threading.Lock()
# lock = threading.Lock()
lock = threading.RLock()  # RLock一定要加（）

for i in range(100):
    t = threading.Thread(target=addnum)
    t.start()
    thread_list.append(t)

for t in thread_list:
    # t.join()
    print('finally num', num)