GTK deadlock in gtk_main

[Tomas Soltys]

Hi all,

I am not sure if this is a bug or just my misunderstanding of how the
synchronization is done in GTK.

Below is a simple "test.c" example in which the deadlock occurs.

Basically program deadlocks itself when "idle_func" is done and control is
returned to "gtk_main".

Thanks for your help in advance,
Tomas

====================================================================
#include <stdlib.h>
#include <glib.h>
#include <gtk/gtk.h>
#include <gdk/gdk.h>

static GStaticMutex customMutex = G_STATIC_MUTEX_INIT;

static void custom_enter (void) {
        g_print ("LOCK\n");
        g_static_mutex_lock (&customMutex);
}

static void custom_leave (void) {
        g_static_mutex_unlock (&customMutex);
        g_print ("UNLOCK\n");
}

static gboolean on_delete_event (GtkWidget *widget,
                                 GdkEvent  *event,
                                 gpointer   user_data) {
        gtk_widget_destroy (widget);
        gtk_main_quit ();
        return TRUE;
}

static gboolean idle_func (gpointer user_data) {
        /* Do something */
        g_print ("IDLE start\n");
        gtk_main_iteration_do (FALSE);
        g_print ("IDLE end\n");
        return FALSE;
}

int main (int argc, char *argv[]) {
        GtkWidget *window;

        gdk_threads_set_lock_functions (custom_enter, custom_leave);
        g_thread_init (NULL);
        gdk_threads_init ();

        gdk_threads_enter ();
        gtk_init (&argc, &argv);

        window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

        g_signal_connect (G_OBJECT(window), "delete-event",
                      G_CALLBACK(on_delete_event),
                      NULL);

        g_idle_add_full (G_PRIORITY_DEFAULT_IDLE, idle_func, NULL, NULL);

        gtk_widget_show (window);

        gtk_main ();

        gdk_threads_leave ();

        return EXIT_SUCCESS;
}
====================================================================
compile command: gcc test.c -o gtkTest `pkg-config --cflags --libs gtk+-2.0`
LINUX dist.: Fedora 13
GTK version: 2.20.1


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