[glib/gobject-speedups: 13/13] Avoid property notification during g_object_set

[Matthias Clasen <matthiasc src gnome org>]

commit a92a8041221fcdaf6c565907fa1db995e003750f
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun May 15 07:56:43 2022 -0400

    Avoid property notification during g_object_set
    
    If we have no nontrivial notify vfunc, and no signal
    handlers for notify, we don't need to maintain the
    notify queue. No need to notify if nobody's listening.

 gobject/gobject.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)
---
diff --git a/gobject/gobject.c b/gobject/gobject.c
index 4d6f18204f..8ec8881433 100644
--- a/gobject/gobject.c
+++ b/gobject/gobject.c
@@ -2484,7 +2484,7 @@ g_object_setv (GObject       *object,
                const GValue   values[])
 {
   guint i;
-  GObjectNotifyQueue *nqueue;
+  GObjectNotifyQueue *nqueue = NULL;
   GParamSpec *pspec;
   GType obj_type;
 
@@ -2495,7 +2495,10 @@ g_object_setv (GObject       *object,
 
   g_object_ref (object);
   obj_type = G_OBJECT_TYPE (object);
-  nqueue = g_object_notify_queue_freeze (object, FALSE);
+
+  if (_g_object_has_notify_handler (object))
+    nqueue = g_object_notify_queue_freeze (object, FALSE);
+
   for (i = 0; i < n_properties; i++)
     {
       pspec = g_param_spec_pool_lookup (pspec_pool, names[i], obj_type, TRUE);
@@ -2506,7 +2509,8 @@ g_object_setv (GObject       *object,
       object_set_property (object, pspec, &values[i], nqueue);
     }
 
-  g_object_notify_queue_thaw (object, nqueue);
+  if (nqueue)
+    g_object_notify_queue_thaw (object, nqueue);
   g_object_unref (object);
 }
 
@@ -2524,13 +2528,13 @@ g_object_set_valist (GObject     *object,
                     const gchar *first_property_name,
                     va_list      var_args)
 {
-  GObjectNotifyQueue *nqueue;
+  GObjectNotifyQueue *nqueue = NULL;
   const gchar *name;
   
   g_return_if_fail (G_IS_OBJECT (object));
-  
-  g_object_ref (object);
-  nqueue = g_object_notify_queue_freeze (object, FALSE);
+
+  if (_g_object_has_notify_handler (object))
+    nqueue = g_object_notify_queue_freeze (object, FALSE);
   
   name = first_property_name;
   while (name)
@@ -2562,8 +2566,10 @@ g_object_set_valist (GObject      *object,
       name = va_arg (var_args, gchar*);
     }
 
-  g_object_notify_queue_thaw (object, nqueue);
+  if (nqueue)
+    g_object_notify_queue_thaw (object, nqueue);
   g_object_unref (object);
+
 }
 
 static inline gboolean