CODEWITHSUNDEEP
pythonsocketsudp
Brian Brown
Brian Brown

Reputation: 4311

UDP socket server, 3 listening sockets at time [Python]

I would like to write a UDP server in Python, which would have 3 different sockets listening on different ports at time. The main job of the server is to send clients a constant text, different for different socket.

I wrote the below code: 

import socket
import thread

def create_socket_server(host, port):
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    s.bind((host, port))
    return s


def run_socket(s, secret):
    while True:
        (data, addr) = s.recvfrom(1024)
        s.sendto(secret, addr)


def run_server():
    s1 = create_socket_server('127.0.0.1', 2000)
    s2 = create_socket_server('127.0.0.1', 3000)
    s3 = create_socket_server('127.0.0.1', 4000)

    while 1:
        thread.start_new_thread(run_socket, (s1, "A"))
        thread.start_new_thread(run_socket, (s2, "B"))
        thread.start_new_thread(run_socket, (s3, "C"))


if __name__ == "__main__":
    run_server()

But after I ran it it showed that:

/usr/bin/python2.7 /home/brian/Temp/udp.py
Traceback (most recent call last):
  File "/home/brian/Temp/udp.py", line 29, in <module>
    run_server()
  File "/home/brian/Temp/udp.py", line 24, in run_server
    thread.start_new_thread(run_socket, (s2, "SI"))
thread.error: can't start new thread

Process finished with exit code 1

What is the problem?

Upvotes: 0

Views: 173

Answers (1)

TheImp
TheImp

Reputation: 11

You are continually trying to re-start the sockets, as they fall under the never ending "while" loop. Remove the "while 1" and instead make your loop at the bottom of the script. could even be 

if __name__ == "__main__":
    run_server()
    while 1:
        time.sleep(1)

This way it will start your threads and then move on, in this case into a never ending sleep. Just as an example. Hope it helps.

Upvotes: 1

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