Re: Goo::Canvas deadlock on Gtk2::Gdk::Threads->enter

[muppet <scott asofyet org>]

On May 7, 2010, at 3:07 AM, Xi Yang wrote:

> The following app has a GooCanvas, and has a button which will add a rect on canvas after clicked. It 
> deadlocks while click on "Add" button.
>
>
>
> ##################################################
>
> #!/usr/bin/perl
> use strict;
>
> use threads;
> use threads::shared;
>
> use Glib qw/TRUE FALSE/;
> use Gtk2 qw/-init -threads-init/;
> use Goo::Canvas;
>
> Glib::Object->set_threadsafe(TRUE);
>
> # create window
> my $win = Gtk2::Window->new;
> $win->signal_connect( destroy => sub { Gtk2->main_quit; } );
> $win->set_title('children rendering test');
>
> my $vbox = Gtk2::VBox->new( FALSE, 6 );
> $win->add($vbox);
>
> # create Add button
> my $hbox = Gtk2::HBox->new(FALSE,6);
> $vbox->pack_start($hbox,FALSE,FALSE,0);
>
> my $but_add_node = Gtk2::Button->new('Add');
> $hbox->pack_start($but_add_node,FALSE,FALSE,0);
> $but_add_node->signal_connect('clicked'=>\&on_add);
>
> # create the c anvas
> my $canvas = Goo::Canvas->new();
> my $root = $canvas->get_root_item;
> $canvas->set_size_request( 800, 500 );
> $vbox->pack_start( $canvas, FALSE, FALSE, 0 );
>
> # enter mainloop
> $win->show_all;

Gtk2::Gdk::Threads->enter;

> Gtk2->main;

Gtk2::Gtk::Threads->leave;


If you're going to use gdk_threads_enter() and gdk_threads_leave() to protect your callbacks, then you need 
to call gdk_threads_enter() before calling Gtk2->main.  The main loop will release the lock before it starts 
each iteration.

http://mail.gnome.org/archives/gtk-devel-list/2007-January/msg00137.html
http://blogs.operationaldynamics.com/andrew/software/gnome-desktop/gtk-thread-awareness.html



> sub on_add {
>     Gtk2::Gdk::Threads->enter;
>     Goo::Canvas::Rect->new(
>         $root,100,100,50,120
>     );
>     Gtk2::Gdk::Threads->leave;
> }
>
>
> ##################################################
>
>
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