Python--day37--进程锁

进程锁的示意图：

　　锁.py:

 1 #锁
 2 #火车票
 3 import json
 4 import time
 5 
 6 from multiprocessing import Process
 7 from multiprocessing import Lock
 8 
 9 def show(i):
10     with open('ticket') as f:
11         dic = json.load(f)
12     print('余票：%s'%dic['ticket'])
13 
14 def buy_ticket(i,lock):
15     lock.acquire()  #拿钥匙进门
16     with open('ticket') as f:
17         dic = json.load(f)
18         time.sleep(0.1)
19     if dic['ticket'] > 0:
20         dic['ticket'] -= 1
21         print('\033[32m%s买到票了\033[0m'%i)
22     else:
23         print('\033[31m%s没买到票\033[0m'%i)
24     time.sleep(0.1)
25     with open('ticket','w') as f:
26         json.dump(dic,f)
27     lock.release()  #还钥匙
28 
29 if __name__ == '__main__':
30     for i in range(10):
31         p = Process(target=show, args=(i,))
32         p.start()
33     lock = Lock()
34     for i in range(10):
35         p = Process(target=buy_ticket, args=(i,lock))
36         p.start()

运行结果：

posted @ 2019-01-25 17:36  莱茵河的雨季  阅读(189)  评论(0)  编辑  收藏  举报