1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
/* 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.
*/
/* WARNING:
*
* This file is INSTALLED and other projects (outside of glib)
* #include its contents.
*/
#ifndef __G_OBJECT_NOTIFY_QUEUE_H__
#define __G_OBJECT_NOTIFY_QUEUE_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;
};
G_LOCK_DEFINE_STATIC(notify_lock);
/* --- functions --- */
static void
g_object_notify_queue_free (gpointer data)
{
GObjectNotifyQueue *nqueue = data;
g_slist_free (nqueue->pspecs);
g_slice_free (GObjectNotifyQueue, nqueue);
}
static inline GObjectNotifyQueue*
g_object_notify_queue_freeze (GObject *object,
GObjectNotifyContext *context)
{
GObjectNotifyQueue *nqueue;
G_LOCK(notify_lock);
nqueue = g_datalist_id_get_data (&object->qdata, context->quark_notify_queue);
if (!nqueue)
{
nqueue = g_slice_new0 (GObjectNotifyQueue);
nqueue->context = context;
g_datalist_id_set_data_full (&object->qdata, context->quark_notify_queue,
nqueue, g_object_notify_queue_free);
}
if (nqueue->freeze_count >= 65535)
g_critical("Free queue for %s (%p) is larger than 65535,"
" called g_object_freeze_notify() too often."
" Forgot to call g_object_thaw_notify() or infinite loop",
G_OBJECT_TYPE_NAME (object), object);
else
nqueue->freeze_count++;
G_UNLOCK(notify_lock);
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);
g_return_if_fail (g_atomic_int_get(&object->ref_count) > 0);
G_LOCK(notify_lock);
/* Just make sure we never get into some nasty race condition */
if (G_UNLIKELY(nqueue->freeze_count == 0)) {
G_UNLOCK(notify_lock);
g_warning ("%s: property-changed notification for %s(%p) is not frozen",
G_STRFUNC, G_OBJECT_TYPE_NAME (object), object);
return;
}
nqueue->freeze_count--;
if (nqueue->freeze_count) {
G_UNLOCK(notify_lock);
return;
}
pspecs = nqueue->n_pspecs > 16 ? free_me = g_new (GParamSpec*, nqueue->n_pspecs) : pspecs_mem;
for (slist = nqueue->pspecs; slist; slist = slist->next)
{
pspecs[n_pspecs++] = slist->data;
}
g_datalist_id_set_data (&object->qdata, context->quark_notify_queue, NULL);
G_UNLOCK(notify_lock);
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_LOCK(notify_lock);
g_slist_free (nqueue->pspecs);
nqueue->pspecs = NULL;
nqueue->n_pspecs = 0;
G_UNLOCK(notify_lock);
}
static inline void
g_object_notify_queue_add (GObject *object,
GObjectNotifyQueue *nqueue,
GParamSpec *pspec)
{
if (pspec->flags & G_PARAM_READABLE)
{
GParamSpec *redirect;
G_LOCK(notify_lock);
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 */
if (g_slist_find (nqueue->pspecs, pspec) == NULL)
{
nqueue->pspecs = g_slist_prepend (nqueue->pspecs, pspec);
nqueue->n_pspecs++;
}
G_UNLOCK(notify_lock);
}
}
/* NB: This function is not threadsafe, do not ever use it if
* you need a threadsafe notify queue.
* Use g_object_notify_queue_freeze() to acquire the queue and
* g_object_notify_queue_thaw() after you are done instead.
*/
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__ */
|
