socket如果一个连接被占用,其他连接发回超时

node1:/root/test#cat t200.py 
# coding = utf-8
# -*- coding:utf-8 -*-
import socket
import time
ip_port = ('192.168.137.2',8080)
BUFSIZE = 9000
SEND_BUF_SIZE =  2
RECV_BUF_SIZE = 1
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)#创建套接字
print("Buffer size [Before]: %d" % s.getsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF))
print("Buffer size [Before]: %d" % s.getsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF))
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.setsockopt( socket.SOL_SOCKET, socket.SO_SNDBUF, SEND_BUF_SIZE)
s.setsockopt( socket.SOL_SOCKET, socket.SO_RCVBUF, RECV_BUF_SIZE)
print 'alter----------------';
print s.getsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF)
print s.getsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF)
#s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 0)
s.bind(ip_port)#绑定地址
s.listen(5)#监听链接
print('server listening8080...')
while True: #无限等待连接
    conn,addr = s.accept() #接受客户端连接
    print(conn)
    print(addr)
    print('接到来自%s的链接'%addr[0])
    while True: #通信循环，无限接受客户端信息
        #print conn.getpeername()
        msg = conn.recv(BUFSIZE) #接受消息的内容
        print 'xxx--------------------xxx'
        print msg
        if len(msg)==0:break  #如果 不加，已连接的客户端突然断开，recv不再阻塞，发生死循环
        print 'xxx--------------------xxx'
        time.sleep(100)
        conn.send('response:'+str(len(msg)))
        #conn.send(msg.upper())#服务端发送消息
    conn.close()#关闭链接
s.close()#关闭套接字
node1:/root/test#


node1:/root/test#python t200.py 
Buffer size [Before]: 16384
Buffer size [Before]: 87380
alter----------------
2048
2280
server listening8080...
<socket._socketobject object at 0x7fc9b27577c0>
('192.168.137.3', 28660)
接到来自192.168.137.3的链接
xxx--------------------xxx
aaaaaaaaaaaaaaa
xxx--------------------xxx


node2:/root/test#python connect1.py 

node2:/root/test#time python connect2.py 
Traceback (most recent call last):
  File "connect2.py", line 9, in <module>
    print s.recv(90)
socket.timeout: timed out

real	0m10.065s
user	0m0.039s
sys	0m0.012s
node2:/root/test#

如果一个连接已经被占用,再启用其他会话去发 会等待超时