** Description changed: Binary package hint: libgtk2-ruby In Ubuntu 9.10 with the version of libgtk2-ruby from the repositories (0.19.0), new threads cause the Gtk main loop to freeze. As an example, the following code will never produce any output: + + ===== Impact ===== + I don't know which program available directly within Ubuntu is written in Ruby-GTK+, but those which do and which are using the Ruby Thread class are broken, and of course developing such a program is broken too. + + The fix is available in ruby-gnome2 since version 0.19.2 and was + introduced through SVN revisions 3692[1] and 3694[2]. Both are within + the attachment "ruby-gnome2-gtk-thread-patch.debdiff" in comment #1. + + [1] http://ruby-gnome2.svn.sourceforge.net/viewvc/ruby-gnome2?view=rev&revision=3692 + [2] http://ruby-gnome2.svn.sourceforge.net/viewvc/ruby-gnome2?view=rev&revision=3694 + + + TEST CASE: require 'gtk2' Thread.new do sleep 1 # Look busy exit # Finished, exit end # Main loop loop do # Process all currently pending events Gtk.main_iteration while Gtk.events_pending? print '.' end However, when the latest version of the bindings is installed (0.19.3) the program works as expected, filling the screen with dots. + TEST CASE 2: + Here is another example for reproducing this bug: + + require "gtk2" + include Gtk, GLib + # Create widgets + window = Window.new + vbox = VBox.new(false, 2) + button = Button.new("Run Thread") + progress = ProgressBar.new + # Pack widgets + window.add(vbox) + vbox.add(button) + vbox.add(progress) + # Set default window size + window.default_width = 120 + window.default_height = 50 + window.show_all + # Connect signals + button.signal_connect("clicked") do + Thread.new do + puts "Thread started!" + progress.pulse + end + end + window.signal_connect("destroy") { main_quit } + # Show all and run + main # start the GTK+ main loop + + The test program shows a window with a button and a progress bar. + Clicking the button will execute a Ruby Thread object, and the GUI + visual elements/the GTK+ main loop will remain freezed. + + REGRESSION: + The only package that depends on ruby-gnome2 in karmic is alien-arena-browser, which is far from being a critical application. The impact of a potential regression would be very limited. + + The example in the bug description is supposed to print dots, and + instead it doesn't. + This problem is also reported at: http://sourceforge.net/mailarchive/forum.php?thread_name=dc3bf8581001120746kb5da118udd0a74439cc4dcd9%40mail.gmail.com&forum_name=ruby-gnome2-devel-en
-- Multithreaded Gtk applications using Ruby bindings freeze https://bugs.launchpad.net/bugs/514899 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
