#!/usr/bin/env python

#!--*--coding:utf-8 --*--

#!@Time    :2018/7/14 17:33

#!@Author   TrueNewBee

#锁

# 火车票

import json

import time

from multiprocessing import Process

from multiprocessing import Lock

def show(i):

    with open('ticket') as f:

        dic = json.load(f)

    print('余票: %s'%dic['ticket'])

def buy_ticket(i,lock):

    lock.acquire() #拿钥匙进门

    with open('ticket') as f:

        dic = json.load(f)

        time.sleep(0.1)

    if dic['ticket'] > 0 :

        dic['ticket'] -= 1

        print('\033[32m%s买到票了\033[0m'%i)

    else:

        print('\033[31m%s没买到票\033[0m'%i)

    time.sleep(0.1)

    with open('ticket','w') as f:

        json.dump(dic,f)

    lock.release()      # 还钥匙

if __name__ == '__main__':

    for i in range(10):

        p = Process(target=show,args=(i,))

        p.start()

    lock = Lock()

    for i in range(10):

        p = Process(target=buy_ticket, args=(i,lock))

        p.start()