[glib] Install an invalidation notifier for GClosure in g_source_set_closure()

[Giovanni Campagna <gcampagna src gnome org>]

commit 1ce415b45bde895c31dd32e2f7ab7e7ab79e735e
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Thu Jan 3 22:53:06 2013 +0100

    Install an invalidation notifier for GClosure in g_source_set_closure()
    
    The point of g_source_set_closure() is getting memory management right,
    including handling closures disappearing from the outside (for example
    because a runtime they refer to is being shutdown). This means that
    sources with an associated closure should remove themselves from the
    main loop and free memory when the closure is invalidated.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=692034

 gobject/gsourceclosure.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/gobject/gsourceclosure.c b/gobject/gsourceclosure.c
index 644a1e0..16f34ee 100644
--- a/gobject/gsourceclosure.c
+++ b/gobject/gsourceclosure.c
@@ -145,6 +145,13 @@ static GSourceCallbackFuncs closure_callback_funcs = {
   closure_callback_get
 };
 
+static void
+closure_invalidated (gpointer  user_data,
+                     GClosure *closure)
+{
+  g_source_destroy (user_data);
+}
+
 /**
  * g_source_set_closure:
  * @source: the source
@@ -176,6 +183,8 @@ g_source_set_closure (GSource  *source,
   g_closure_sink (closure);
   g_source_set_callback_indirect (source, closure, &closure_callback_funcs);
 
+  g_closure_add_invalidate_notifier (closure, source, closure_invalidated);
+
   if (G_CLOSURE_NEEDS_MARSHAL (closure))
     {
       GClosureMarshal marshal = (GClosureMarshal)source->source_funcs->closure_marshal;