select() problem, not timing out

[D. Shifflett]

Hi all,
I am having trouble with a program that ran fine on

Python 2.0 (#0, Mar 1 2001, 01:47:55)
[GCC 2.95.1 19990816 (release)] on linux2

but will not work on

Python 2.3.2 (#1, Oct  8 2003, 17:33:47)
[GCC 3.3.2 20030908 (Debian prerelease)] on linux2

These are part of Familiar Linux running on a iPAQ.

The program has a button to cause a packet to be sent to a server,
the program also has a thread to read packets from the server.
I send a packet, I get one back, pretty simple.

I am using select() to wait for packets
and it isn't functioning as expected.

select() doesn't return until I have sent a packet
even though I am using a short timeout (1 second)

So whats happening is I send a packet,
select() returns but I have no input yet,
then I have to send a second packet
then select returns and I can read the 
response to the first packet.

Here's a snippet of the code

from sys import argv
from gtk import *
import socket
import time
import threading
import select
...
my_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
my_sock.bind(('', MY_PORT))

class readerthread(threading.Thread):
    def __init__(self):
        self._stopevent = threading.Event()
        print "thread init"
        threading.Thread.__init__(self, name="readerthread")

    def run(self):
        ilist = []
        ilist.append(my_sock)
        print "readerthread - my_sock %d" % my_sock.fileno()
        while not self._stopevent.isSet():

            print "about to select"
            il,ol,el = select(ilist,[],[],1)

            # read from the socket, etc
            if il != []:
                data, addr = my_sock.recvfrom(1024)
                print "recv() Data length %d" %len(data)
                print "recv() Data %s" % data
            else:
                print "No input from select"

    def join(self,timeout=None):
        """
        Stop the thread
        """
        self._stopevent.set()
        threading.Thread.join(self, timeout)
...
def button_cb(button):
    my_sock.sendto(data, (SERVERADDR, SERVERPORT))
...

I first posted this problem back on March 11.
I thought it was due to switching to a Win XP system,
now it seems to be due to switch Python versions.

I have tried all the sugestions made back in March,
none fixed the problem.

I have tried
ilist.append(my_sock.fileno()) - instead of ilist.append(my_sock)
also
il,ol,el = select([my_sock.fileno()],[],[],1) and
il,ol,el = select([my_sock],[],[],1)
instead of il,ol,el = select(ilist,[],[],1)

Do I need to do something to set a default timeout?
Does the default timeout override the select() timeout?

Any help would be appreciated.
Thanks (sorry for the long post),
David Shifflett