MacRuby NSTextView adding text hangs program

I have NSTextView that i add text to using

def puts(val)
    storage = @output.textStorage
    storage.beginEditing
    storage.appendAttributedString(NSAttributedString.alloc.initWithString(val+"\n"))
    storage.endEditing
end

This works for few times but at some point in time it hangs the whole program (spinning ball of death).

I'm calling this method from MacRuby thread so i think that it has something to do with it.

Solution

I set the string property of my NSTextView called home_text by

home_text.string = "a very loooooong string"

I've Never had a "beach volleyball/pizza of death". When I'm not sure I can rely on a default value I add a control on the string I want to add to the NSTextView to avoid setting it to a nil value. Basic stuff here, I know sorry!

Are you doing any I/O operation, in your main thread or somewhere else, without using Cocoa most robust Asynchronous APIs? Like downloading stuff from the web which , for example, would be performed more safely using NSURLDownload instead of either

Net::HTTP.get('...a url...','..a path..")

download_url = NSURl.UrlWithString '...a url...'
download_data = NSMutableStringalloc.initWithContentsOfUrl(download_url, 
                                                           encoding:..., 
                                                            error:...)

that are synchronous. This could explain the randomness of your problem, although it's just one of the possible causes.