glib/gobject/gobjectnotifyqueue.c
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 03 May 2010 14:06:43 +0300
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permissions -rw-r--r--
Revision: 201018 Kit: 201018
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/* GObject - GLib Type, Object, Parameter and Signal Library
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 * Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc.
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General
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 * Public License along with this library; if not, write to the
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 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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 * Boston, MA 02111-1307, USA.
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 */
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#ifndef __G_OBJECT_NOTIFY_QUEUE_H__
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#define __G_OBJECT_NOTIFY_QUEUE_H__
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#include <string.h> /* memset */
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#include <glib-object.h>
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G_BEGIN_DECLS
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/* --- typedefs --- */
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#if (!EMULATOR)
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typedef struct _GObjectNotifyContext          GObjectNotifyContext;
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#endif
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typedef struct _GObjectNotifyQueue            GObjectNotifyQueue;
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#if (!EMULATOR)
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typedef void (*GObjectNotifyQueueDispatcher) (GObject     *object,
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					      guint        n_pspecs,
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					      GParamSpec **pspecs);
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/* --- structures --- */
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struct _GObjectNotifyContext
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{
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  GQuark                       quark_notify_queue;
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  GObjectNotifyQueueDispatcher dispatcher;
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  GTrashStack                 *_nqueue_trash; /* unused */
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};
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#endif
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struct _GObjectNotifyQueue
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{
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  GObjectNotifyContext *context;
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  GSList               *pspecs;
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  guint16               n_pspecs;
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  guint16               freeze_count;
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  /* currently, this structure abuses the GList allocation chain and thus
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   * must be <= sizeof (GList)
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   */
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};
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/* --- functions --- */
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static void
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g_object_notify_queue_free (gpointer data)
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{
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  GObjectNotifyQueue *nqueue = data;
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  g_slist_free (nqueue->pspecs);
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  g_list_free_1 ((void*) nqueue);
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}
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static inline GObjectNotifyQueue*
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g_object_notify_queue_freeze (GObject		   *object,
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			      GObjectNotifyContext *context)
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{
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  GObjectNotifyQueue *nqueue;
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  nqueue = g_datalist_id_get_data (&object->qdata, context->quark_notify_queue);
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  if (!nqueue)
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    {
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      nqueue = (void*) g_list_alloc ();
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      memset (nqueue, 0, sizeof (*nqueue));
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      nqueue->context = context;
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      g_datalist_id_set_data_full (&object->qdata, context->quark_notify_queue,
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				   nqueue, g_object_notify_queue_free);
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    }
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  g_return_val_if_fail (nqueue->freeze_count < 65535, nqueue);
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  nqueue->freeze_count++;
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  return nqueue;
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}
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static inline void
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g_object_notify_queue_thaw (GObject            *object,
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			    GObjectNotifyQueue *nqueue)
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{
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  GObjectNotifyContext *context = nqueue->context;
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  GParamSpec *pspecs_mem[16], **pspecs, **free_me = NULL;
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  GSList *slist;
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  guint n_pspecs = 0;
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  g_return_if_fail (nqueue->freeze_count > 0);
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  nqueue->freeze_count--;
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  if (nqueue->freeze_count)
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    return;
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  g_return_if_fail (object->ref_count > 0);
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  pspecs = nqueue->n_pspecs > 16 ? free_me = g_new (GParamSpec*, nqueue->n_pspecs) : pspecs_mem;
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  /* set first entry to NULL since it's checked unconditionally */
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  pspecs[0] = NULL;
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  for (slist = nqueue->pspecs; slist; slist = slist->next)
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    {
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      GParamSpec *pspec = slist->data;
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      guint i = 0;
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   116
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      /* dedup, make pspecs in the list unique */
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    redo_dedup_check:
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      if (pspecs[i] == pspec)
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	continue;
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      if (++i < n_pspecs)
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	goto redo_dedup_check;
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   123
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      pspecs[n_pspecs++] = pspec;
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    }
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  g_datalist_id_set_data (&object->qdata, context->quark_notify_queue, NULL);
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   127
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  if (n_pspecs)
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    context->dispatcher (object, n_pspecs, pspecs);
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  g_free (free_me);
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}
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   132
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static inline void
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g_object_notify_queue_clear (GObject            *object,
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			     GObjectNotifyQueue *nqueue)
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{
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  g_return_if_fail (nqueue->freeze_count > 0);
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   138
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   139
  g_slist_free (nqueue->pspecs);
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   140
  nqueue->pspecs = NULL;
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   141
  nqueue->n_pspecs = 0;
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   142
}
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   143
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   144
static inline void
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   145
g_object_notify_queue_add (GObject            *object,
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   146
			   GObjectNotifyQueue *nqueue,
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   147
			   GParamSpec	      *pspec)
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   148
{
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   149
  if (pspec->flags & G_PARAM_READABLE)
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   150
    {
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   151
      GParamSpec *redirect;
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   152
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   153
      g_return_if_fail (nqueue->n_pspecs < 65535);
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diff changeset
   154
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   155
      redirect = g_param_spec_get_redirect_target (pspec);
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   156
      if (redirect)
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   157
	pspec = redirect;
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parents:
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   158
	    
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   159
      /* we do the deduping in _thaw */
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   160
      nqueue->pspecs = g_slist_prepend (nqueue->pspecs, pspec);
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   161
      nqueue->n_pspecs++;
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   162
    }
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   163
}
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diff changeset
   164
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   165
static inline GObjectNotifyQueue*
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   166
g_object_notify_queue_from_object (GObject              *object,
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   167
				   GObjectNotifyContext *context)
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   168
{
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   169
  return g_datalist_id_get_data (&object->qdata, context->quark_notify_queue);
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   170
}
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   171
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   172
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   173
G_END_DECLS
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   174
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   175
#endif /* __G_OBJECT_NOTIFY_QUEUE_H__ */