#!/usr/bin/env python

# encoding: utf-8  

# Date: 2018/6/18

from threading import Thread, Lock

import time

n = 100

def task():

    global n

    mutex.acquire()  # 阻止其他99个线程在这里等待，保证数据安全

    temp = n

    time.sleep(0.1)  # 启动一个线程，睡0.1秒足够100个线程全部启动

    n = temp - 1  # 100个线程全部修改为99

    mutex.release()

if __name__ == '__main__':

    mutex = Lock()

    t_l = []

    time1 = time.time()

    for i in range(100):  # 一个进程内开了100个线程

        t = Thread(target=task)

        t_l.append(t)

        t.start()

    for i in t_l:

        t.join()  # 保证主线程执行完毕

    time2 = time.time()

    time3 = time2-time1

    print('主', n, time3)  # 主 0 10.06277322769165