Multi-Thread Server

Hello :
    I am a newbie of www-lib. I am asked to survey some lib for http
post
capability. I've traced some part of www-lib, and found that www-lib
use many "private" global variables. Does this means that if my program
is a multi-thread server, the lib will cause problem?

Let me describe our program in more details. Our program will be
a server, and each time it gets a request, it will create a new thread
to handle the incoming request. Each request will need to do a http post

to other web server. each thread need a blocking with timeout socket
connection.
We are thinking of writing a wrapper function so that when we need to
post
data, we just need to call the function, and when it return, the posting
will be
either finish(with or without error) or timeout. So how could I achieve
this?
I think it is not proper to set the socket blocking because it will be
not able
to return if the remote server doesn't response forever. should the
wrapper function call event_loop? if so, then it is possible that more
than two threads will
call event loop at the same time. could this cause problem? As I guess,
it will
be... Could anybody help me with those problem? thanks in advance...

    Frank