阻塞IO：操作系统等数据，只发生了一次调用，最大问题：cpu被耽搁了
非阻塞IO：问题：1、发生多次系统调用 2、数据不及时
IO multiplexing model io多路复用，多一个系统调用，但可以建立多链接
#########################################blocking IO # import socket # # sk=socket.socket() # # sk.bind(("127.0.0.1",8080)) # # sk.listen(5) # # while 1: # conn,addr=sk.accept() # # while 1: # conn.send("hello client".encode("utf8")) # data=conn.recv(1024) # print(data.decode("utf8"))########################################################nonblocking IO# import time # import socket # sk = socket.socket(socket.AF_INET,socket.SOCK_STREAM) # sk.bind(('127.0.0.1',6667)) # sk.listen(5) # sk.setblocking(False) # print ('waiting client connection .......') # while True: # try: # # connection,address = sk.accept() # 进程主动轮询 # print("+++",address) # client_messge = connection.recv(1024) # print(str(client_messge,'utf8')) # connection.close() # except Exception as e: # print (e) # time.sleep(4)########################################################io多路复用# import socket # import select # sk=socket.socket() # sk.bind(("127.0.0.1",9904)) # sk.listen(5) # inp=[sk,] # while True: # # r,w,e=select.select(inp,[],[],5) #[sk,conn] # # for i in r:#[sk,] # conn,add=i.accept() # print(conn) # print("hello") # inp.append(conn) # print('>>>>>>')
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