Oh, I've just added a simpler test-case in bugzilla... it is not
necessary that background operation does anything... that is, the 'Main'
method of NSOperation can be empty!
The strange thing is that, compiled with SDK 5.0, the application works
under iOS 4.3 but not under iOS 5.0! I mean: I understand that the new
GC is more aggressive, but the execution of the same application differs
from one OS to the other!!
However, I've tried to create the same application in pure Objective-C
(I even thought that was a iOS bug), but it works! Only a thing it is
different from the managed application: to simplify the implementation
I've used NSInvocationOperation instead of NSOperation.
In any case, thank you for the support!
Sergio
Il 19/10/2011 17:51, Jeff Stedfast ha scritto:
On Wed, Oct 19, 2011 at 3:22 AM, Sergio Fadda<[email protected]> 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
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