[liblo] TCP servers

Hi,

I've been attempting to use a liblo server in TCP mode to send multiple
messages on a connection that stays open.  I ended up looking through the
source code and it doesn't seem possible to do this.

In the function,
void *lo_server_recv_raw_stream(lo_server s, size_t *size),

the socket is accepted:
sock = accept(s->socket, (struct sockaddr *)&addr, &addr_len);

then it's used to receive a single message, but there's no way to get to
the connected socket after this. It's not stored anywhere, and apparently
not closed either:

    //close(sock);

I've been thinking about how this might be fixed.  What do you think about
master/slave servers?  The master would listen on the socket, and when a
connection is accept()ed, a new slave lo_server would be created that uses the
new socket.  lo_server would need a list of slaves (add a next pointer so they
can be linked together?) and there would probably need to be some functions to
get access to the them: lo_server_get_first_slave(), lo_server_get_next_slave()
or something like that.

Also, as Dave Robillard points out in the bug tracker:
"lo_server_thread_new_with_proto missing
The corresponding function to lo_server_new_with_proto
for server threads is missing, which means you can't
make a server thread which listens to TCP (not good)"

I'm thinking that TCP server threads could work in two ways:
1) New thread for each connection
2) Do the select() thing on all of the slave connections

I may try some of these ideas out and get back with some patches, but wanted to
see what developers thought.

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