using threads

Hi,

I'm trying to write a simple testing tool, which will simultaneously fetch 
pages from different URLs, using libwww. 

Therefore I tried to modify showlinks.c. I moved all the original code in 
main() to a procedure, showlinks(). Inside main(), pthread_create() is 
called to run showlinks() and then it waits for the thread to terminate by 
calling pthread_join(). 

However, this simple modification doesn't seem to work and I don't know why. 
I traced the code in GDB and it failed at HTTCP.c:280 connect() Does this 
have anything to do with I/O multiplexing in libwww? It's very helpful if 
you could give me some advice. I am using verison 5.26. 

Thanks!!!

Andrew