非阻塞io模型

非阻塞io模型

#server端
import socket

sk = socket.socket()
sk.bind(("127.0.0.1",9000))
sk.setblocking(False) #将其设置为非阻塞模型，如果发生了阻塞便报错
sk.listen()


conn_1 = []
del_1 = []
while True:
    try:
        conn,addr = sk.accept() #阻塞，直到有一个客户端连我
        # print(conn) #接受了一个便打印
        conn_1.append(conn)
    except BlockingIOError: #无接受时,便报错，没接受，便进入该循环
        for c in conn_1: #将所接受的各个元素拿出来
            try:
                msg = c.recv(1024).decode("utf-8")
                if not msg:
                    del_1.append(c)
                print(msg)
                c.send(msg.upper().encode("utf-8"))
            except BlockingIOError:pass
        for c in del_1:
            conn_1.remove(c)
        del_1.clear()

sk.close()

#socket的非阻塞io模型 + io多路复用实现的
 #虽然非阻塞，提高了cpu的利用率，但是消耗了cpu做了很多无用功

     
 #client1端
import socket
import time


sk = socket.socket()
sk.connect(("127.0.0.1",9000))
for i in range(30):
    sk.send(b"alex")
    msg = sk.recv(1024)
    print(msg)
    time.sleep(0.2)

sk.close()


#client2端
import socket
import time


sk = socket.socket()
sk.connect(("127.0.0.1",9000))
for i in range(30):
    sk.send(b"wusir")
    msg = sk.recv(1024)
    print(msg)
    time.sleep(0.2)

sk.close()