python-poll实现异步IO

 #!usr/bin/python

 from socket import *
 from select import *
 from time import ctime
 s=socket()
 s.bind(('127.0.0.1',6653))

 d={s.fileno():s}
 s.listen(5)

 p=poll()
 p.register(s)

 while 1:
     events=p.poll()
     for fd,event in events:
         if fd==s.fileno():
             c,addr=s.accept()
             print "connect from ",addr
             p.register(c)
             d[c.fileno()]=c
         elif event & POLLIN:
             data=d[fd].recv(1024)
             if not data:
                 print d[fd].getpeername(),"discponnect"
                 p.unregister(fd)
                 del d[fd]
             else:
                 print data
                 d[fd].send("[%s]%s"%(ctime(),data))
 s.close()