Learning Python Network Programming

A non-blocking socket I/O

In this section, we will see a small example code snippet to test a non-blocking socket I/O. This is useful if you know that the synchronous blocking connection is not necessary for your program. The following is an example of non-blocking I/O:

import socket

if __name__ == '__main__':
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setblocking(0)
    sock.settimeout(0.5)
    sock.bind(("127.0.0.1", 0))

    socket_address =sock.getsockname()
    print("Asynchronous socket server launched on socket: %s" %str(socket_address))
    while(1):
        sock.listen(1)

This script will run a socket server and listen in a non-blocking style. This means you can connect more clients who won't be necessarily blocked for I/O.