[MonoTouch] SDK 5 issue

[Jeff Stedfast]

On Wed, Oct 19, 2011 at 3:22 AM, Sergio Fadda <sergio.fadda at logobject.ch> wrote:
> Hi Jeff,
>
> thanks for the reply.
>
> Unfortunately the issue is present even if I click the button once; I said
> "variable number of times" because sometimes it is needed one click, and
> sometimes more clicks to replicate the issue.

Ah! I'm sorry, I had misunderstood...

> However, doesn't NSOperationQueue mantain a... queue? If so, every instance
> of NSOperation should be referenced during the execution and removed from
> the queue only when the operation finish... I guess!

Yes, it does... but the problem is the it's the ObjectiveC code that
holds a pointer to C# memory but the GC doesn't know that ObjectiveC
is still using it, so it frees it.

This is a source of a lot of confusion among MonoTouch users and one
of our top runtime guys is working on figuring out a way to make this
work more seamlessly.

>
> Anyway, I tried to maintain my own NSOperation list that I populate before
> adding the operation to the NSOperationQueue and the issue is still there!

Okay, then it sounds like my original guess is wrong :-(

I've created a new project and added your code to see if I can figure
out what the real issue is, so far it has proven difficult.

Jeff