diff -r e4d67989cc36 -r 47c74d1534e1 glib/gobject/gobjectnotifyqueue.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/glib/gobject/gobjectnotifyqueue.c	Fri Apr 16 16:46:38 2010 +0300
@@ -0,0 +1,175 @@
+/* GObject - GLib Type, Object, Parameter and Signal Library
+ * Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __G_OBJECT_NOTIFY_QUEUE_H__
+#define __G_OBJECT_NOTIFY_QUEUE_H__
+
+#include <string.h> /* memset */
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+
+/* --- typedefs --- */
+#if (!EMULATOR)
+typedef struct _GObjectNotifyContext          GObjectNotifyContext;
+#endif
+typedef struct _GObjectNotifyQueue            GObjectNotifyQueue;
+#if (!EMULATOR)
+typedef void (*GObjectNotifyQueueDispatcher) (GObject     *object,
+					      guint        n_pspecs,
+					      GParamSpec **pspecs);
+
+
+/* --- structures --- */
+struct _GObjectNotifyContext
+{
+  GQuark                       quark_notify_queue;
+  GObjectNotifyQueueDispatcher dispatcher;
+  GTrashStack                 *_nqueue_trash; /* unused */
+};
+#endif
+struct _GObjectNotifyQueue
+{
+  GObjectNotifyContext *context;
+  GSList               *pspecs;
+  guint16               n_pspecs;
+  guint16               freeze_count;
+  /* currently, this structure abuses the GList allocation chain and thus
+   * must be <= sizeof (GList)
+   */
+};
+
+
+/* --- functions --- */
+static void
+g_object_notify_queue_free (gpointer data)
+{
+  GObjectNotifyQueue *nqueue = data;
+
+  g_slist_free (nqueue->pspecs);
+  g_list_free_1 ((void*) nqueue);
+}
+
+static inline GObjectNotifyQueue*
+g_object_notify_queue_freeze (GObject		   *object,
+			      GObjectNotifyContext *context)
+{
+  GObjectNotifyQueue *nqueue;
+
+  nqueue = g_datalist_id_get_data (&object->qdata, context->quark_notify_queue);
+  if (!nqueue)
+    {
+      nqueue = (void*) g_list_alloc ();
+      memset (nqueue, 0, sizeof (*nqueue));
+      nqueue->context = context;
+      g_datalist_id_set_data_full (&object->qdata, context->quark_notify_queue,
+				   nqueue, g_object_notify_queue_free);
+    }
+
+  g_return_val_if_fail (nqueue->freeze_count < 65535, nqueue);
+  nqueue->freeze_count++;
+
+  return nqueue;
+}
+
+static inline void
+g_object_notify_queue_thaw (GObject            *object,
+			    GObjectNotifyQueue *nqueue)
+{
+  GObjectNotifyContext *context = nqueue->context;
+  GParamSpec *pspecs_mem[16], **pspecs, **free_me = NULL;
+  GSList *slist;
+  guint n_pspecs = 0;
+
+  g_return_if_fail (nqueue->freeze_count > 0);
+
+  nqueue->freeze_count--;
+  if (nqueue->freeze_count)
+    return;
+  g_return_if_fail (object->ref_count > 0);
+
+  pspecs = nqueue->n_pspecs > 16 ? free_me = g_new (GParamSpec*, nqueue->n_pspecs) : pspecs_mem;
+  /* set first entry to NULL since it's checked unconditionally */
+  pspecs[0] = NULL;
+  for (slist = nqueue->pspecs; slist; slist = slist->next)
+    {
+      GParamSpec *pspec = slist->data;
+      guint i = 0;
+
+      /* dedup, make pspecs in the list unique */
+    redo_dedup_check:
+      if (pspecs[i] == pspec)
+	continue;
+      if (++i < n_pspecs)
+	goto redo_dedup_check;
+
+      pspecs[n_pspecs++] = pspec;
+    }
+  g_datalist_id_set_data (&object->qdata, context->quark_notify_queue, NULL);
+
+  if (n_pspecs)
+    context->dispatcher (object, n_pspecs, pspecs);
+  g_free (free_me);
+}
+
+static inline void
+g_object_notify_queue_clear (GObject            *object,
+			     GObjectNotifyQueue *nqueue)
+{
+  g_return_if_fail (nqueue->freeze_count > 0);
+
+  g_slist_free (nqueue->pspecs);
+  nqueue->pspecs = NULL;
+  nqueue->n_pspecs = 0;
+}
+
+static inline void
+g_object_notify_queue_add (GObject            *object,
+			   GObjectNotifyQueue *nqueue,
+			   GParamSpec	      *pspec)
+{
+  if (pspec->flags & G_PARAM_READABLE)
+    {
+      GParamSpec *redirect;
+
+      g_return_if_fail (nqueue->n_pspecs < 65535);
+
+      redirect = g_param_spec_get_redirect_target (pspec);
+      if (redirect)
+	pspec = redirect;
+	    
+      /* we do the deduping in _thaw */
+      nqueue->pspecs = g_slist_prepend (nqueue->pspecs, pspec);
+      nqueue->n_pspecs++;
+    }
+}
+
+static inline GObjectNotifyQueue*
+g_object_notify_queue_from_object (GObject              *object,
+				   GObjectNotifyContext *context)
+{
+  return g_datalist_id_get_data (&object->qdata, context->quark_notify_queue);
+}
+
+
+G_END_DECLS
+
+#endif /* __G_OBJECT_NOTIFY_QUEUE_H__ */