#include <gtk/gtk.h>

void subroutine(GtkWidget *button, gpointer data);
gboolean sleeper(GtkWidget *subwindow);

int main( int argc, char *argv[])
	{
	GtkWidget *window, *button;
	gtk_init(&argc, &argv);
	window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
	g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(gtk_main_quit), NULL);
	button=gtk_button_new_from_stock(GTK_STOCK_OK);
	g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(subroutine), NULL);
	gtk_container_add(GTK_CONTAINER(window),button);
	gtk_widget_show_all(window);
	gtk_main();
	return 0;
	}

void subroutine(GtkWidget *button, gpointer data)
	{
	gint x;
	GtkWidget *subwindow, *vbox,*label;
	subwindow=gtk_window_new(GTK_WINDOW_TOPLEVEL);
	gtk_window_set_default_size(GTK_WINDOW(subwindow), 400, 50);
	vbox=gtk_vbox_new(FALSE,0);
	gtk_container_add(GTK_CONTAINER(subwindow),vbox);
	label=gtk_label_new("Label");
	gtk_container_add(GTK_CONTAINER(vbox),label);
	gtk_widget_show_all(subwindow);
	for (x=0; x < 3000; x++)
		{
		while (g_main_context_iteration(NULL, FALSE));
		g_idle_add_full(G_PRIORITY_LOW,(GSourceFunc)sleeper,(gpointer)subwindow,NULL);
		}
	gtk_widget_destroy(subwindow);
	return;
	}
	

gboolean sleeper(GtkWidget *subwindow)
	{
	g_usleep(1000);
	return FALSE;
	}