1 | /* GObject - GLib Type, Object, Parameter and Signal Library |
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2 | * Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc. |
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3 | * |
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4 | * This library is free software; you can redistribute it and/or |
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5 | * modify it under the terms of the GNU Lesser General Public |
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6 | * License as published by the Free Software Foundation; either |
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7 | * version 2 of the License, or (at your option) any later version. |
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8 | * |
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9 | * This library is distributed in the hope that it will be useful, |
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10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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12 | * Lesser General Public License for more details. |
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13 | * |
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14 | * You should have received a copy of the GNU Lesser General |
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15 | * Public License along with this library; if not, write to the |
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16 | * Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
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17 | * Boston, MA 02111-1307, USA. |
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18 | */ |
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19 | #ifndef __G_NOTIFY_H__ |
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20 | #define __G_NOTIFY_H__ |
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21 | |
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22 | #include <string.h> /* memset */ |
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23 | #include <glib-object.h> |
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24 | |
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25 | G_BEGIN_DECLS |
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26 | |
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27 | |
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28 | /* --- typedefs --- */ |
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29 | typedef struct _GObjectNotifyContext GObjectNotifyContext; |
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30 | typedef struct _GObjectNotifyQueue GObjectNotifyQueue; |
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31 | typedef void (*GObjectNotifyQueueDispatcher) (GObject *object, |
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32 | guint n_pspecs, |
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33 | GParamSpec **pspecs); |
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34 | |
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35 | |
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36 | /* --- structures --- */ |
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37 | struct _GObjectNotifyContext |
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38 | { |
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39 | GQuark quark_notify_queue; |
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40 | GObjectNotifyQueueDispatcher dispatcher; |
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41 | GTrashStack *_nqueue_trash; /* unused */ |
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42 | }; |
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43 | struct _GObjectNotifyQueue |
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44 | { |
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45 | GObjectNotifyContext *context; |
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46 | GSList *pspecs; |
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47 | guint16 n_pspecs; |
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48 | guint16 freeze_count; |
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49 | /* currently, this structure abuses the GList allocation chain and thus |
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50 | * must be <= sizeof (GList) |
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51 | */ |
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52 | }; |
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53 | |
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54 | |
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55 | /* --- functions --- */ |
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56 | static void |
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57 | g_object_notify_queue_free (gpointer data) |
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58 | { |
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59 | GObjectNotifyQueue *nqueue = data; |
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60 | |
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61 | g_slist_free (nqueue->pspecs); |
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62 | g_list_free_1 ((void*) nqueue); |
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63 | } |
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64 | |
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65 | static inline GObjectNotifyQueue* |
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66 | g_object_notify_queue_freeze (GObject *object, |
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67 | GObjectNotifyContext *context) |
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68 | { |
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69 | GObjectNotifyQueue *nqueue; |
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70 | |
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71 | nqueue = g_datalist_id_get_data (&object->qdata, context->quark_notify_queue); |
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72 | if (!nqueue) |
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73 | { |
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74 | nqueue = (void*) g_list_alloc (); |
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75 | memset (nqueue, 0, sizeof (*nqueue)); |
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76 | nqueue->context = context; |
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77 | g_datalist_id_set_data_full (&object->qdata, context->quark_notify_queue, |
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78 | nqueue, g_object_notify_queue_free); |
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79 | } |
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80 | |
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81 | g_return_val_if_fail (nqueue->freeze_count < 65535, nqueue); |
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82 | nqueue->freeze_count++; |
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83 | |
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84 | return nqueue; |
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85 | } |
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86 | |
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87 | static inline void |
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88 | g_object_notify_queue_thaw (GObject *object, |
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89 | GObjectNotifyQueue *nqueue) |
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90 | { |
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91 | GObjectNotifyContext *context = nqueue->context; |
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92 | GParamSpec *pspecs_mem[16], **pspecs, **free_me = NULL; |
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93 | GSList *slist; |
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94 | guint n_pspecs = 0; |
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95 | |
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96 | g_return_if_fail (nqueue->freeze_count > 0); |
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97 | |
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98 | nqueue->freeze_count--; |
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99 | if (nqueue->freeze_count) |
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100 | return; |
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101 | g_return_if_fail (object->ref_count > 0); |
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102 | |
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103 | pspecs = nqueue->n_pspecs > 16 ? free_me = g_new (GParamSpec*, nqueue->n_pspecs) : pspecs_mem; |
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104 | /* set first entry to NULL since it's checked unconditionally */ |
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105 | pspecs[0] = NULL; |
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106 | for (slist = nqueue->pspecs; slist; slist = slist->next) |
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107 | { |
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108 | GParamSpec *pspec = slist->data; |
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109 | gint i = 0; |
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110 | |
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111 | /* dedup, make pspecs in the list unique */ |
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112 | redo_dedup_check: |
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113 | if (pspecs[i] == pspec) |
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114 | continue; |
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115 | if (++i < n_pspecs) |
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116 | goto redo_dedup_check; |
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117 | |
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118 | pspecs[n_pspecs++] = pspec; |
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119 | } |
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120 | g_datalist_id_set_data (&object->qdata, context->quark_notify_queue, NULL); |
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121 | |
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122 | if (n_pspecs) |
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123 | context->dispatcher (object, n_pspecs, pspecs); |
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124 | g_free (free_me); |
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125 | } |
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126 | |
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127 | static inline void |
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128 | g_object_notify_queue_clear (GObject *object, |
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129 | GObjectNotifyQueue *nqueue) |
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130 | { |
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131 | g_return_if_fail (nqueue->freeze_count > 0); |
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132 | |
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133 | g_slist_free (nqueue->pspecs); |
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134 | nqueue->pspecs = NULL; |
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135 | nqueue->n_pspecs = 0; |
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136 | } |
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137 | |
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138 | static inline void |
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139 | g_object_notify_queue_add (GObject *object, |
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140 | GObjectNotifyQueue *nqueue, |
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141 | GParamSpec *pspec) |
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142 | { |
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143 | if (pspec->flags & G_PARAM_READABLE) |
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144 | { |
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145 | GParamSpec *redirect; |
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146 | |
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147 | g_return_if_fail (nqueue->n_pspecs < 65535); |
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148 | |
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149 | redirect = g_param_spec_get_redirect_target (pspec); |
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150 | if (redirect) |
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151 | pspec = redirect; |
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152 | |
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153 | /* we do the deduping in _thaw */ |
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154 | nqueue->pspecs = g_slist_prepend (nqueue->pspecs, pspec); |
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155 | nqueue->n_pspecs++; |
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156 | } |
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157 | } |
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158 | |
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159 | static inline GObjectNotifyQueue* |
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160 | g_object_notify_queue_from_object (GObject *object, |
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161 | GObjectNotifyContext *context) |
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162 | { |
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163 | return g_datalist_id_get_data (&object->qdata, context->quark_notify_queue); |
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164 | } |
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165 | |
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166 | |
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167 | G_END_DECLS |
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168 | |
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169 | #endif /* __G_OBJECT_H__ */ |
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