Re: [Chicken-users] Implementing a C-API to a chicken library

[Thomas Chust]

On Fri, 2014-05-09 at 16:56 +0200, Isak Andersson wrote:
> [...]
> Basically I want to define a C API (because that's easy to call from
> all languages) that will be used on many platforms 
> (ios, android, winrt, windows, osx etc). 
> [...]

Hello Isak,

what you want to do should indeed be possible to achieve using
define-external. However, CHICKEN's runtime system needs to be
initialized and the top-level Scheme code needs to be run before you can
call back into scheme.

> [...]
> So what I did was that I created a simple test with the following
> source code:
> https://gist.github.com/BitPuffin/f8ad6fa6f43327a84611
> [...]

Make the following changes:

* Replace the call of CHICKEN_initialize in src/init.c by
  CHICKEN_run(C_toplevel). This will ensure that the runtime system is
  initialized *and* all top-level Scheme code that may do further
  initialization work has been executed once.

* Add (return-to-host) to the end of src/itest.scm. This will ensure
  that the call to CHICKEN_run actually returns after all initialization
  work has been completed.

Then your code should work as expected :-)

Ciao,
Thomas


-- 
When C++ is your hammer, every problem looks like your thumb.