进程 - 多进程之间的数据隔离问题、使用多进程实现socket服务端的并发效果（三）

# 进程 与 进程之间的数据是隔离的，比如例子两个变量n

import os
from multiprocessing import Process

def func():
 global n # 声明了一个全局变量
 n = 0 # 重新定义了一个n
 print('pid : %s'%os.getpid(),n)

if __name__ == '__main__':
 n = 100
 p = Process(target=func)
 p.start()
 p.join()
 print(os.getpid(),n)


# 使用多进程实现socket服务端的并发效果
client端

import socket

sk = socket.socket()
sk.connect(('127.0.0.1',8080))
msg = sk.recv(1024).decode('utf-8')
print(msg)
msg2 = input('>>>').encode('utf-8')
sk.send(msg2)
sk.close()

server端

import socket
from multiprocessing import Process
def serve(conn):
    ret = '你好'.encode('utf-8')
 conn.send(ret)
 msg = conn.recv(1024).decode('utf-8')
 print(msg)
 conn.close()

if __name__ == '__main__' :
 sk = socket.socket()
 sk.bind(('127.0.0.1',8080))
 sk.listen()
 try:
 while True:
 conn,addr = sk.accept()
 p = Process(target=serve,args=(conn,))
 p.start()
 finally:
 sk.close()