I have the following sample program (C++):
#include <iostream>
#include <gtkmm.h>
#include <boost/thread.hpp>
using namespace std;
Gtk::Window * window;
Glib::Dispatcher dispatcher;
void do_updates();
void load_layout();
int x;
int main(int argc, char ** argv)
{
Glib::RefPtr<Gtk::Application> app = Gtk::Application::create(argc, argv, "nl.mycroes.test");
window = new Gtk::Window;
window->set_default_size(200, 200);
Gtk::Label * label = new Gtk::Label("label");
window->add(*label);
dispatcher.connect(&load_layout);
window->show_all();
boost::thread t = boost::thread(do_updates);
app->run(*window);
Gtk::Widget * child = window->get_children().front();
delete child;
return 0;
}
void load_layout()
{
stringstream layout;
layout << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
<< endl << "<interface>"
<< endl << "<object class=\"GtkWindow\" id=\"window\">"
<< endl << "<child>"
<< endl << "<object class=\"GtkLabel\" id=\"text\">"
<< endl << "<property name=\"visible\">True</property>"
<< endl << "<property name=\"can_focus\">False</property>"
<< endl << "<property name=\"label\">" << x << "</property>"
<< endl << "</object>"
<< endl << "</child>"
<< endl << "</object>"
<< endl << "</interface>";
Glib::RefPtr<Gtk::Builder> builder = Gtk::Builder::create_from_string(layout.str());
Gtk::Window * win;
builder->get_widget("window", win);
std::vector<Gtk::Widget *> old_children = window->get_children();
Gtk::Widget * child = old_children.front();
window->remove();
delete child;
std::vector<Gtk::Widget *> new_children = win->get_children();
child = new_children.front();
child->reparent(*window);
delete win;
}
void do_updates()
{
for (x = 0; x < 10000; x++)
{
boost::this_thread::sleep(boost::posix_time::milliseconds(1));
dispatcher();
}
}
If I keep an eye on the memory usage (watch -n 1 "grep ^Vm /proc/\$(pgrep GtkLeakTest)/status") it keeps increasing, but I don't know what's staying around in memory. Also, valgrind doesn't report any leaks at all, which makes it seem like I'm properly cleaning everything up...
I actually tried if I had to recursive delete the window child, because this is a testcase for a program where I'm loading a larger galde layout and that also leaks, but I tried and and logically doesn't make a difference because I don't put nested components in the window. Any hints are appreciated!
