Hi Ruben,

Using an Objective-C class in a MacRuby script is the first step in both recipes currently posted to the MacRuby website (http://www.macruby.org/documentation.html). Your choices are either to add a "dummy" Init_foo{} function and make a foo.bundle from the class or compile the Objective-C files to a foo.framework and then either put the framework in a well known location (like /Library/Frameworks) or modify the DYLD_FRAMEWORK_PATH before running your MacRuby script.

If you want more details on wrapping C API, I am currently working on just such a project, and might be able to put together another recipe. What sort of information would you be looking for specifically? Is there a particular C API you'd be interested in seeing how to wrap?

Finally, as to your later question, there actually *is* a MacRuby API for GCD currently in the 0.5 beta and nightly builds.