A toy example of embedding C code in lisp and vice versa

[bolega]

Here is a link to a thread that discusses this topic but there is no
complete example.

http://objectmix.com/lisp/362409-howto-use-lisp-scripting-language-within-c.html

Lars Lune has a good section on code by searching this string

"On Tue, 18 Mar 2008 01:16:00 -0700, Blackguester wrote:"

but his code is replaced with smileys and even source shows it. I
could not muster the confidence as a newbie to go into it by myself.
Unless a guru can guide and explain.

http://common-lisp.net/project/cffi/
http://common-lisp.net/project/cffi/manual/html_node/Tutorial.html
http://www.sbcl.org/manual/Foreign-Function-Interface.html

Should I pick SBCL or ECL ? I have a long term view.