[MacRuby-devel] NSInvocationOperation usage Segmentation fault

[Sven A. Schmidt]

Hi Alex,

I'm afraid I'm not able to help with your problem directly, but maybe I can provide an additional angle for debugging.

I've seen frequent crashes using Dispatch, which may be related. I've had to remove multi-threading from my Core Data Document-Based application due to these crashes and in the process of trying to figure out if it's me, my code, or the underlying framework that's causing it I've arrived at the following example. It reproducibly causes a EXC_BAD_INSTRUCTION and prints

  unknown: [BUG] destination 0x8002989802c0 isn't in the auto zone

to the console.

The project is a "Core Data Document-Based Application" project (this is important) and simply includes a class A:

class A
  def dispatch(&block)
    puts "dispatch"
  end
end

which is wired to an action in the document class:

class MyDocument < NSPersistentDocument
  def init
    super
    if (self != nil)
      @a = A.new
      @queue = Dispatch::Queue.new('myqueue')
    end
    self
  end

  def windowNibName
    "MyDocument"
  end

  def dispatch(sender)
    @queue.async do
      @a.dispatch do |t|
      end
    end
  end
end
-----------------

The same setup works fine in a regular (no Cora Data, non-Document-Based) project. Note that even though the dispatch accepts a block but doesn't use it, this is actually required to trigger the error. Dispatching a method without parameters works fine.

I should note I'm using the 2011-09-23 nightly on Lion with Xcode 4.2 (GM).

Maybe that helps in tracking this down.

Cheers,
Sven

On Oct 11, 2011, at 8:19, Alex Greif wrote:

> The following code crashes with a segmentation fault.
> Any idea whether I misunderstood the usage or it is a macruby bug?
> 
> thanks,
> ALex.
> 
> ---code-------------------------------------------
> framework 'Foundation'
> 
> class Foo
>  def bar
>    puts 'bar'
>  end
> end
> 
> operation = NSInvocationOperation.alloc.initWithTarget Foo.new, selector:
> 'bar', object: nil
> 
> queue = NSOperationQueue.alloc.init
> queue.addOperation(operation)
> 
> # run the main loop for 2 seconds
> NSRunLoop.currentRunLoop.runUntilDate(NSDate.dateWithTimeIntervalSinceNow(2.0))
> 
> 
> 
> _______________________________________________
> MacRuby-devel mailing list
> MacRuby-devel at lists.macosforge.org
> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel

--

Dr. Sven A. Schmidt
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