# 進程 與 進程之間的數據是隔離的，比如例子兩個變量n

import os
from multiprocessing import Process

def func():
    global n   # 聲明了一個全局變量
    n = 0       # 重新定義了一個n
    print(‘pid : %s‘%os.getpid(),n)

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


# 使用多進程實現socket服務端的並發效果
 
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()

進程 - 多進程之間的數據隔離問題、使用多進程實現socket服務端的並發效果（三）