How to read and write the same socket in different threads?

I'd like to read and write the same socket in different threads.
one thread is only used to read from the socket, and the other is only
used to write to the socket.
But I always get a 10022 'Invalid argument' exception. Anyone knows why?

I'm using windows xp.

my source code is here:
http://pastebin.com/m23e633a2

and the stack trace is:
C:\WINDOWS\system32\cmd.exe /c python "main.py"
Exception in thread Thread-1:
Traceback (most recent call last):
File "c:\Python25\lib\threading.py", line 486, in __bootstrap_inner
self.run()
File "c:\Python25\lib\threading.py", line 446, in run
self.__target(*self.__args, **self.__kwargs)
File "main.py", line 7, in read_socket
sock.connect(('127.0.0.1', remoteport))
File "<string>", line 1, in connect
error: (10022, 'Invalid argument')

Exception in thread Thread-3:
Traceback (most recent call last):
File "c:\Python25\lib\threading.py", line 486, in __bootstrap_inner
self.run()
File "c:\Python25\lib\threading.py", line 446, in run
self.__target(*self.__args, **self.__kwargs)
File "main.py", line 7, in read_socket
sock.connect(('127.0.0.1', remoteport))
File "<string>", line 1, in connect
error: (10022, 'Invalid argument')
If i replace the 'args' in line 39 with '(socket(), remoteport)', which means
use a different socket to connect to the remote port, the program works.
But if the first element of the tuple is 's', the program doesn't work.

Is it possible to read and write the same socket in different threads?

Thanks in advance.

--
Best Regards,
Leo Jay