RE: [clisp-list] FFI - Creating c-places in LISP?

[Dave R. <da...@sy...>]

> I have decided to take a different approach to implementing my TCP-based
> server.  Rather than use the socket server/stream classes, I am 
> going to try
> accessing the socket calls directly.  This is how CMUCL handles 
> the problem
> and my early tests on CMUCL have been quite favorable.  Which leads to my
> question:
> 
> 	Is it possible in the FFI to define a c-struct 
> (def-c-struct) then create
> an instance of it in LISP, initialize it, then pass a pointer to 
> it via FFI?
> I guess what I am asking is whether it's possible to allocate a c-place
> inside the LISP heap.
> 	My reading of the implementation notes imply that 
> "c-places" originate
> outside the LISP heap, i.e. have static storage class.  One could 
> infer that
> C code could malloc() a region and return this, but how then do we ensure
> free() is called at GC finalization?

Ah!  WITH-FOREIGN-OBJECT.  That'll do it.