[Mono-bugs] [Bug 673645] Method passed to native code as callback is called with 'this' reference equaling 'null'

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=673645

https://bugzilla.novell.com/show_bug.cgi?id=673645#c1


Zoltan Varga <vargaz at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |vargaz at gmail.com

--- Comment #1 from Zoltan Varga <vargaz at gmail.com> 2011-02-21 05:08:09 UTC ---
You should make sure that the delegate which is passed to native code is kept
alive somehow, i.e. changing your example to:

    static Action f;

    static void Main()
    {
        f = new Foo ().Bar;

        initialize(f);

        while(true) execute();
    }

Otherwise, the runtime will collect the delegate, causing all kinds of strange
crashes, see:

http://www.mono-project.com/Interop_with_Native_Libraries#Memory_Boundaries

You can run with MONO_DEBUG=keep-delegates to have the runtime detect this
error automatically.

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