How Nginx can talk to other library

Hi All,

Here's what I wanted to do:

1) I wanted to write a Nginx location handler for example "/mylocation" which when invoked should call another program to get the response.

2) The other external program provides a client library where we can register callbacks.

3) The external program will call the callback when the data is available.

I wanted to know if I am using an external library and one of the external API is asking for registering callback, how i can achieve this in Nginx.

I cannot give any function from my handler, as that is called internally by the nginx Core.

Please guide me how i can register a callback inside Nginx which will be called by the external program.

Thanks,

Raul.