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/* 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_NOTIFY_H__
#define __G_NOTIFY_H__
#include <string.h> /* memset */
#include <glib-object.h>
G_BEGIN_DECLS
/* --- typedefs --- */
typedef struct _GObjectNotifyContext GObjectNotifyContext;
typedef struct _GObjectNotifyQueue GObjectNotifyQueue;
typedef void (*GObjectNotifyQueueDispatcher) (GObject *object,
guint n_pspecs,
GParamSpec **pspecs);
/* --- structures --- */
struct _GObjectNotifyContext
{
GQuark quark_notify_queue;
GObjectNotifyQueueDispatcher dispatcher;
GTrashStack *_nqueue_trash; /* unused */
};
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_NOTIFY_H__ */
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