From: Thomas Sondergaard <thomas@...>
Date: 2003-09-12T07:14:34+09:00
Subject: Re: GC - PLEASE  set me straight


> Hmm ... I'm confused about that statement.

Well that wont do..

> If the VALUE is a member of a class, then it's probably NOT on the
> stack, so volatile won't help you there.  In this case, just use
> rb_gc_register_address/rb_gc_unregister_address in your
> constructor/destructor methods for your C++ class.

1) I am using rb_gc_register/unregister in my C++ wrapper.

2) I have now added the volatile keyword in all the functions where I use an
automatic variable.


Here's the relevant bit of the C++ wrapper:

public __gc class Object : public DynamicLanguageSupport::IObject {
public:
    explicit Object(VALUE handle) {
        _handle = ALLOC(VALUE);
        *_handle = handle;
        rb_gc_register_address(_handle);
    }

    ~Object() {
        rb_gc_unregister_address(_handle);
        free(_handle);
    }

    // stuff for invoking ruby methods from .net removed

    private:
    VALUE __nogc *_handle;
};

Does it look reasonable?

Cheers,

Thomas