Nested domains or "How do I leave a domain"

[phidelta]

Hi, 

I am really liking the new domains feature. However I have a question: "How do I leave a domain"

Is my undesrtanding correct?:

    function b(callback) {

      // I am running inside the domain created in a

      fs.readFile('some-file', 'utf-8', function(err, val) {

        // I am running inside the domain created in a

        if (err) return callback(err);

        callback(undefined, val.replace('A','B'));

      });

    }

    function a() {

      var d=domain.create();

      d.run(b.bind(null, callback))

    }

    function callback() {

      // I am running inside the domain created in a

    }

If so, then how do I leave a domain? Simply dispose of it? Then in which domain am I afterwards? Think nested domains. Am I in the one I was in before doing *domain.run()* in *a*?

I I'm wrong in my understanding, then how do I ensure that all my async calls/callbacks remain in the domain I created?

I would really appreciate if someone could explain this, since I am about to embark on some major efforts that would really benefit from using domains. Understanding how they work would be sort of fundamental ;)

Regards,

Philipp

[Marco Rogers]

Don't know if you were at Node Summercamp, but we talked a lot about domains. It's clear that there's lots of confusion about the semantics. I've got some of the same questions. I had planned on finally sitting down to explore them tomorrow. I can tell you that domains *are* nested. When you start a new domain, it goes on a stack. And when you close it, you are back in the previous domain.

:Marco