[Openmcl-devel] Calling Lisp from C example?

[Yannick Versley]

> Can anyone point me towards an example that shows how to call a Lisp
> function from C and how to link that into your C program.

Calling a Lisp function from C is not difficult (but irksome), it can be
done with something like
(defcallback my-c-callback (:without-interrupts nil
				:unsigned-fullword arg1)
   (format t "my-c-callback(~A)" arg1))
This creates a C stub for the lisp function and you can give that
to a c function that expects a function pointer.

Linking the lisp interpreter into a C program seems nontrivial to me. The
main routine (in ccl/lisp-kernel/pmcl-kernel.c) does lots of magic to set
up the environment.

If you want to have it simple, you can use Objective C to glue the two
together. This is much simpler than the above (thanks to apple-objc.lisp),
and a good example is in ccl/examples/fscript.lisp
The drawback is that you still have to make a framework out of your C
code.

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