From: David Brady <ruby_talk@...>
Date: 2005-07-08T01:10:54+09:00
Subject: cross-thread violation in TkCanvas when clicked

Hi All,

The Pickaxe (2e) gives an example of drawing on a TkCanvas.  The code is 
published on the book's website here:

http://www.pragmaticprogrammer.com/titles/ruby/code/smp262.html

I run this with no changes.  When I click on the canvas, the script 
crashes with this message:

/usr/local/lib/ruby/1.8/tk.rb:1383: [BUG] cross-thread violation on 
ip_ruby_cmd()
ruby 1.8.2 (2004-12-25) [i686-linux]

The offending line is simply the mainloop method:
  def mainloop(check_root = true)
    TclTkLib.mainloop(check_root)
  end

I find nothing in the errata for the book about this script not working, 
so I assume the problem is with my ruby installation or my linux setup.  
Any ideas where I can begin looking?

I am running Ruby 1.8.2 with KDE 3.4 on Kubuntu 5.0.4.

Thanks!

-dB
--
David Brady
ruby-talk@shinybit.com
I'm having a really surreal day... OR AM I?