1 | /* GLIB - Library of useful routines for C programming |
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2 | * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald |
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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 Public |
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15 | * 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 | |
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20 | /* |
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21 | * Modified by the GLib Team and others 1997-2000. See the AUTHORS |
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22 | * file for a list of people on the GLib Team. See the ChangeLog |
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23 | * files for a list of changes. These files are distributed with |
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24 | * GLib at ftp://ftp.gtk.org/pub/gtk/. |
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25 | */ |
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26 | |
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27 | #ifndef __G_HOOK_H__ |
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28 | #define __G_HOOK_H__ |
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29 | |
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30 | #include <glib/gmem.h> |
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31 | |
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32 | G_BEGIN_DECLS |
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33 | |
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34 | |
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35 | /* --- typedefs --- */ |
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36 | typedef struct _GHook GHook; |
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37 | typedef struct _GHookList GHookList; |
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38 | |
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39 | typedef gint (*GHookCompareFunc) (GHook *new_hook, |
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40 | GHook *sibling); |
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41 | typedef gboolean (*GHookFindFunc) (GHook *hook, |
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42 | gpointer data); |
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43 | typedef void (*GHookMarshaller) (GHook *hook, |
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44 | gpointer marshal_data); |
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45 | typedef gboolean (*GHookCheckMarshaller) (GHook *hook, |
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46 | gpointer marshal_data); |
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47 | typedef void (*GHookFunc) (gpointer data); |
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48 | typedef gboolean (*GHookCheckFunc) (gpointer data); |
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49 | typedef void (*GHookFinalizeFunc) (GHookList *hook_list, |
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50 | GHook *hook); |
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51 | typedef enum |
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52 | { |
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53 | G_HOOK_FLAG_ACTIVE = 1 << 0, |
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54 | G_HOOK_FLAG_IN_CALL = 1 << 1, |
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55 | G_HOOK_FLAG_MASK = 0x0f |
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56 | } GHookFlagMask; |
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57 | #define G_HOOK_FLAG_USER_SHIFT (4) |
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58 | |
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59 | |
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60 | /* --- structures --- */ |
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61 | struct _GHookList |
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62 | { |
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63 | gulong seq_id; |
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64 | guint hook_size : 16; |
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65 | guint is_setup : 1; |
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66 | GHook *hooks; |
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67 | GMemChunk *hook_memchunk; |
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68 | GHookFinalizeFunc finalize_hook; |
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69 | gpointer dummy[2]; |
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70 | }; |
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71 | struct _GHook |
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72 | { |
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73 | gpointer data; |
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74 | GHook *next; |
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75 | GHook *prev; |
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76 | guint ref_count; |
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77 | gulong hook_id; |
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78 | guint flags; |
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79 | gpointer func; |
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80 | GDestroyNotify destroy; |
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81 | }; |
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82 | |
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83 | |
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84 | /* --- macros --- */ |
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85 | #define G_HOOK(hook) ((GHook*) (hook)) |
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86 | #define G_HOOK_FLAGS(hook) (G_HOOK (hook)->flags) |
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87 | #define G_HOOK_ACTIVE(hook) ((G_HOOK_FLAGS (hook) & \ |
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88 | G_HOOK_FLAG_ACTIVE) != 0) |
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89 | #define G_HOOK_IN_CALL(hook) ((G_HOOK_FLAGS (hook) & \ |
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90 | G_HOOK_FLAG_IN_CALL) != 0) |
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91 | #define G_HOOK_IS_VALID(hook) (G_HOOK (hook)->hook_id != 0 && \ |
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92 | (G_HOOK_FLAGS (hook) & \ |
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93 | G_HOOK_FLAG_ACTIVE)) |
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94 | #define G_HOOK_IS_UNLINKED(hook) (G_HOOK (hook)->next == NULL && \ |
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95 | G_HOOK (hook)->prev == NULL && \ |
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96 | G_HOOK (hook)->hook_id == 0 && \ |
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97 | G_HOOK (hook)->ref_count == 0) |
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98 | |
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99 | |
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100 | /* --- prototypes --- */ |
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101 | /* callback maintenance functions */ |
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102 | void g_hook_list_init (GHookList *hook_list, |
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103 | guint hook_size); |
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104 | void g_hook_list_clear (GHookList *hook_list); |
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105 | GHook* g_hook_alloc (GHookList *hook_list); |
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106 | void g_hook_free (GHookList *hook_list, |
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107 | GHook *hook); |
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108 | void g_hook_ref (GHookList *hook_list, |
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109 | GHook *hook); |
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110 | void g_hook_unref (GHookList *hook_list, |
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111 | GHook *hook); |
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112 | gboolean g_hook_destroy (GHookList *hook_list, |
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113 | gulong hook_id); |
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114 | void g_hook_destroy_link (GHookList *hook_list, |
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115 | GHook *hook); |
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116 | void g_hook_prepend (GHookList *hook_list, |
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117 | GHook *hook); |
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118 | void g_hook_insert_before (GHookList *hook_list, |
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119 | GHook *sibling, |
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120 | GHook *hook); |
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121 | void g_hook_insert_sorted (GHookList *hook_list, |
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122 | GHook *hook, |
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123 | GHookCompareFunc func); |
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124 | GHook* g_hook_get (GHookList *hook_list, |
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125 | gulong hook_id); |
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126 | GHook* g_hook_find (GHookList *hook_list, |
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127 | gboolean need_valids, |
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128 | GHookFindFunc func, |
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129 | gpointer data); |
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130 | GHook* g_hook_find_data (GHookList *hook_list, |
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131 | gboolean need_valids, |
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132 | gpointer data); |
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133 | GHook* g_hook_find_func (GHookList *hook_list, |
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134 | gboolean need_valids, |
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135 | gpointer func); |
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136 | GHook* g_hook_find_func_data (GHookList *hook_list, |
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137 | gboolean need_valids, |
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138 | gpointer func, |
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139 | gpointer data); |
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140 | /* return the first valid hook, and increment its reference count */ |
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141 | GHook* g_hook_first_valid (GHookList *hook_list, |
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142 | gboolean may_be_in_call); |
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143 | /* return the next valid hook with incremented reference count, and |
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144 | * decrement the reference count of the original hook |
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145 | */ |
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146 | GHook* g_hook_next_valid (GHookList *hook_list, |
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147 | GHook *hook, |
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148 | gboolean may_be_in_call); |
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149 | /* GHookCompareFunc implementation to insert hooks sorted by their id */ |
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150 | gint g_hook_compare_ids (GHook *new_hook, |
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151 | GHook *sibling); |
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152 | /* convenience macros */ |
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153 | #define g_hook_append( hook_list, hook ) \ |
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154 | g_hook_insert_before ((hook_list), NULL, (hook)) |
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155 | /* invoke all valid hooks with the (*GHookFunc) signature. |
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156 | */ |
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157 | void g_hook_list_invoke (GHookList *hook_list, |
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158 | gboolean may_recurse); |
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159 | /* invoke all valid hooks with the (*GHookCheckFunc) signature, |
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160 | * and destroy the hook if FALSE is returned. |
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161 | */ |
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162 | void g_hook_list_invoke_check (GHookList *hook_list, |
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163 | gboolean may_recurse); |
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164 | /* invoke a marshaller on all valid hooks. |
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165 | */ |
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166 | void g_hook_list_marshal (GHookList *hook_list, |
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167 | gboolean may_recurse, |
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168 | GHookMarshaller marshaller, |
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169 | gpointer marshal_data); |
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170 | void g_hook_list_marshal_check (GHookList *hook_list, |
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171 | gboolean may_recurse, |
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172 | GHookCheckMarshaller marshaller, |
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173 | gpointer marshal_data); |
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174 | |
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175 | G_END_DECLS |
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176 | |
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177 | #endif /* __G_HOOK_H__ */ |
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178 | |
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