1 | /* GObject - GLib Type, Object, Parameter and Signal Library |
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2 | * Copyright (C) 2000-2001 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 | #if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION) |
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20 | #error "Only <glib-object.h> can be included directly." |
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21 | #endif |
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22 | |
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23 | #ifndef __G_CLOSURE_H__ |
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24 | #define __G_CLOSURE_H__ |
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25 | |
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26 | #include <gobject/gtype.h> |
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27 | |
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28 | G_BEGIN_DECLS |
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29 | |
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30 | /* --- defines --- */ |
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31 | #define G_CLOSURE_NEEDS_MARSHAL(closure) (((GClosure*) (closure))->marshal == NULL) |
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32 | #define G_CLOSURE_N_NOTIFIERS(cl) ((cl)->meta_marshal + ((cl)->n_guards << 1L) + \ |
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33 | (cl)->n_fnotifiers + (cl)->n_inotifiers) |
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34 | #define G_CCLOSURE_SWAP_DATA(cclosure) (((GClosure*) (closure))->derivative_flag) |
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35 | #define G_CALLBACK(f) ((GCallback) (f)) |
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36 | |
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37 | |
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38 | /* -- typedefs --- */ |
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39 | typedef struct _GClosure GClosure; |
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40 | typedef struct _GClosureNotifyData GClosureNotifyData; |
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41 | typedef void (*GCallback) (void); |
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42 | typedef void (*GClosureNotify) (gpointer data, |
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43 | GClosure *closure); |
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44 | typedef void (*GClosureMarshal) (GClosure *closure, |
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45 | GValue *return_value, |
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46 | guint n_param_values, |
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47 | const GValue *param_values, |
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48 | gpointer invocation_hint, |
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49 | gpointer marshal_data); |
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50 | typedef struct _GCClosure GCClosure; |
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51 | |
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52 | |
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53 | /* --- structures --- */ |
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54 | struct _GClosureNotifyData |
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55 | { |
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56 | gpointer data; |
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57 | GClosureNotify notify; |
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58 | }; |
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59 | struct _GClosure |
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60 | { |
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61 | /*< private >*/ guint ref_count : 15; |
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62 | /*< private >*/ guint meta_marshal : 1; |
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63 | /*< private >*/ guint n_guards : 1; |
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64 | /*< private >*/ guint n_fnotifiers : 2; /* finalization notifiers */ |
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65 | /*< private >*/ guint n_inotifiers : 8; /* invalidation notifiers */ |
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66 | /*< private >*/ guint in_inotify : 1; |
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67 | /*< private >*/ guint floating : 1; |
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68 | /*< protected >*/ guint derivative_flag : 1; |
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69 | /*< public >*/ guint in_marshal : 1; |
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70 | /*< public >*/ guint is_invalid : 1; |
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71 | |
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72 | /*< private >*/ void (*marshal) (GClosure *closure, |
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73 | GValue /*out*/ *return_value, |
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74 | guint n_param_values, |
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75 | const GValue *param_values, |
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76 | gpointer invocation_hint, |
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77 | gpointer marshal_data); |
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78 | /*< protected >*/ gpointer data; |
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79 | |
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80 | /*< private >*/ GClosureNotifyData *notifiers; |
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81 | |
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82 | /* invariants/constrains: |
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83 | * - ->marshal and ->data are _invalid_ as soon as ->is_invalid==TRUE |
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84 | * - invocation of all inotifiers occours prior to fnotifiers |
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85 | * - order of inotifiers is random |
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86 | * inotifiers may _not_ free/invalidate parameter values (e.g. ->data) |
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87 | * - order of fnotifiers is random |
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88 | * - each notifier may only be removed before or during its invocation |
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89 | * - reference counting may only happen prior to fnotify invocation |
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90 | * (in that sense, fnotifiers are really finalization handlers) |
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91 | */ |
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92 | }; |
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93 | /* closure for C function calls, callback() is the user function |
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94 | */ |
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95 | struct _GCClosure |
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96 | { |
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97 | GClosure closure; |
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98 | gpointer callback; |
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99 | }; |
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100 | |
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101 | |
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102 | /* --- prototypes --- */ |
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103 | GClosure* g_cclosure_new (GCallback callback_func, |
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104 | gpointer user_data, |
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105 | GClosureNotify destroy_data); |
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106 | GClosure* g_cclosure_new_swap (GCallback callback_func, |
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107 | gpointer user_data, |
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108 | GClosureNotify destroy_data); |
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109 | GClosure* g_signal_type_cclosure_new (GType itype, |
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110 | guint struct_offset); |
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111 | |
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112 | |
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113 | /* --- prototypes --- */ |
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114 | GClosure* g_closure_ref (GClosure *closure); |
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115 | void g_closure_sink (GClosure *closure); |
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116 | void g_closure_unref (GClosure *closure); |
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117 | /* intimidating */ |
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118 | GClosure* g_closure_new_simple (guint sizeof_closure, |
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119 | gpointer data); |
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120 | void g_closure_add_finalize_notifier (GClosure *closure, |
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121 | gpointer notify_data, |
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122 | GClosureNotify notify_func); |
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123 | void g_closure_remove_finalize_notifier (GClosure *closure, |
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124 | gpointer notify_data, |
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125 | GClosureNotify notify_func); |
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126 | void g_closure_add_invalidate_notifier (GClosure *closure, |
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127 | gpointer notify_data, |
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128 | GClosureNotify notify_func); |
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129 | void g_closure_remove_invalidate_notifier (GClosure *closure, |
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130 | gpointer notify_data, |
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131 | GClosureNotify notify_func); |
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132 | void g_closure_add_marshal_guards (GClosure *closure, |
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133 | gpointer pre_marshal_data, |
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134 | GClosureNotify pre_marshal_notify, |
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135 | gpointer post_marshal_data, |
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136 | GClosureNotify post_marshal_notify); |
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137 | void g_closure_set_marshal (GClosure *closure, |
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138 | GClosureMarshal marshal); |
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139 | void g_closure_set_meta_marshal (GClosure *closure, |
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140 | gpointer marshal_data, |
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141 | GClosureMarshal meta_marshal); |
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142 | void g_closure_invalidate (GClosure *closure); |
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143 | void g_closure_invoke (GClosure *closure, |
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144 | GValue /*out*/ *return_value, |
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145 | guint n_param_values, |
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146 | const GValue *param_values, |
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147 | gpointer invocation_hint); |
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148 | |
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149 | /* FIXME: |
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150 | OK: data_object::destroy -> closure_invalidate(); |
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151 | MIS: closure_invalidate() -> disconnect(closure); |
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152 | MIS: disconnect(closure) -> (unlink) closure_unref(); |
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153 | OK: closure_finalize() -> g_free (data_string); |
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154 | |
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155 | random remarks: |
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156 | - need marshaller repo with decent aliasing to base types |
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157 | - provide marshaller collection, virtually covering anything out there |
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158 | */ |
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159 | |
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160 | G_END_DECLS |
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161 | |
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162 | #endif /* __G_CLOSURE_H__ */ |
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