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今天没事练习python的epoll，一开始写了个客户端：
#! /usr/python import socket,sys,select c=socket.socket(socket.AF_INET,socket.SOCK_STREAM) host = ‘127.0.0.1‘ port=57777 c.connect((host,port)) epoll_fd = select.epoll() epoll_fd.register(c.fileno(),select.EPOLLIN) epoll_fd.register(sys.stdin.fileno(), select.EPOLLIN) str="" while True: e_list = epoll_fd.poll() for fd,events in e_list: if fd == c.fileno() and events&select.EPOLLIN: buf = c.recv(1024) if not len(buf): break print "ser:",buf if fd == c.fileno() and events & select.EPOLLOUT: #print ‘send msg to ser.‘ c.send(str) epoll_fd.modify(c.fileno(), select.EPOLLIN) if fd == sys.stdin.fileno() and events & select.EPOLLIN: str="ssf" epoll_fd.modify(c.fileno(), select.EPOLLOUT) c.close()
发现服务端总是进入死循环收信息，甚是迷惑。后来修改了 str="ssf"处，修改为raw_input，发现程序正常运行，恍然醒悟，epoll默认
是LT模式，缓冲里的数据没读走，是每次都会触发的，因此，上面的代码修改epoll_fd.register(sys.stdin.fileno(), select.EPOLLIN)
为epoll_fd.register(sys.stdin.fileno(), select.EPOLLIN|select.EPOLLOUT) 也是能正常工作的。
附上最终代码：
client.py
#! /usr/python import socket,sys,select c=socket.socket(socket.AF_INET,socket.SOCK_STREAM) host = ‘127.0.0.1‘ port=57777 c.connect((host,port)) epoll_fd = select.epoll() epoll_fd.register(c.fileno(),select.EPOLLIN) epoll_fd.register(sys.stdin.fileno(), select.EPOLLIN) str="" while True: e_list = epoll_fd.poll() for fd,events in e_list: if fd == c.fileno() and events&select.EPOLLIN: buf = c.recv(1024) if not len(buf): break print "ser:",buf if fd == c.fileno() and events & select.EPOLLOUT: #print ‘send msg to ser.‘ c.send(str) epoll_fd.modify(c.fileno(), select.EPOLLIN) if fd == sys.stdin.fileno() and events & select.EPOLLIN: str=raw_input("me: ") epoll_fd.modify(c.fileno(), select.EPOLLOUT) c.close()
简单的server和client相似
import socket, os,select,sys host=‘127.0.0.1‘ port=57777 s = socket.socket(socket.AF_INET,socket.SOCK_STREAM) s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) s.bind((host,port)) s.listen(10) epoll_obj=select.epoll() epoll_obj.register(sys.stdin.fileno(), select.EPOLLIN) print ‘wait for connect‘ cs,caddr=s.accept() epoll_obj.register(cs.fileno(), select.EPOLLIN) str="" while 1: readylist = epoll_obj.poll() for fd,event in readylist: if fd == cs.fileno() and event & select.EPOLLIN: buf = cs.recv(128) if not len(buf): cs.close() break print "cli: ", buf if fd == cs.fileno() and event & select.EPOLLOUT: cs.send(str) epoll_obj.modify(cs.fileno(), select.EPOLLIN) if fd == sys.stdin.fileno() and event&select.EPOLLIN: str=raw_input("me:") epoll_obj.modify(cs.fileno(), select.EPOLLOUT)
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原文地址：http://www.cnblogs.com/lijinping/p/5946190.html
