Unbinding sockets in threads..

Richard Spooner rspooner at frisurf.no
Tue Aug 3 09:47:44 CEST 2004


Chaps,

I've written a piece of python code below that when called with a line such
as x = getdata(9999), listens on that port for data I'm sending it and puts
the data in a list.  If I delete x using del x and then try and assign a new
value to port 9999 (e.g z=getdata(9999) ) then it reports that the socket it
already bound, and I can't find any way of unbinding the port.

If I try it not in a thread the del function works fine (i.e. creating and
binding a socket s and then deleting it)  Can anyone suggest some
modifications I can do to make this work??

Thanks in advance

Dave

import threading
import socket
import struct
import sys
import time





class getdata(threading.Thread):
    def __init__(self, port):
        threading.Thread.__init__(self)
        self.x = ['ZERO SPACE']
        self.s = socket.socket( socket.AF_INET, socket.SOCK_DGRAM )
        try:
            self.s.bind(( '', port))

        except socket.error, msg:
            print "Could not bind to socket"
            time.sleep(3)
            self.s.close()
            sys.exit(1)
        self.carryon = 'true'
        self.start()






    def run(self):
        while self.carryon == 'true':
            self.data, self.addr = self.s.recvfrom( 1024 )
            self.channel, self.value = struct.unpack( 'IBxxx' , self.data )
            try:
                self.x[int(self.channel)] = self.value
            except IndexError:
                while len(self.x)-1 < int(self.channel):
                    if len(self.x) == int(self.channel):
                        self.x.append(self.value)
                    else:
                        self.x.append('NA')
            except:
                print "Dictionary creation error"
                time.sleep(3)
                self.s.close()
                sys.exit

            print self.x
        return





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