glib/ghook.h

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GLib Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #ifndef __G_HOOK_H__
  28 #define __G_HOOK_H__
  29
  30 #include <glib/gmem.h>
  31
  32 G_BEGIN_DECLS
  33
  34
  35 /* --- typedefs --- */
  36 typedef struct _GHook           GHook;
  37 typedef struct _GHookList       GHookList;
  38
  39 typedef gint            (*GHookCompareFunc)     (GHook          *new_hook,
  40                                                  GHook          *sibling);
  41 typedef gboolean        (*GHookFindFunc)        (GHook          *hook,
  42                                                  gpointer        data);
  43 typedef void            (*GHookMarshaller)      (GHook          *hook,
  44                                                  gpointer        marshal_data);
  45 typedef gboolean        (*GHookCheckMarshaller) (GHook          *hook,
  46                                                  gpointer        marshal_data);
  47 typedef void            (*GHookFunc)            (gpointer        data);
  48 typedef gboolean        (*GHookCheckFunc)       (gpointer        data);
  49 typedef void            (*GHookFinalizeFunc)    (GHookList      *hook_list,
  50                                                  GHook          *hook);
  51 typedef enum
  52 {
  53   G_HOOK_FLAG_ACTIVE        = 1 << 0,
  54   G_HOOK_FLAG_IN_CALL       = 1 << 1,
  55   G_HOOK_FLAG_MASK          = 0x0f
  56 } GHookFlagMask;
  57 #define G_HOOK_FLAG_USER_SHIFT  (4)
  58
  59
  60 /* --- structures --- */
  61 struct _GHookList
  62 {
  63   gulong            seq_id;
  64   guint             hook_size : 16;
  65   guint             is_setup : 1;
  66   GHook            *hooks;
  67   GMemChunk        *hook_memchunk;
  68   GHookFinalizeFunc finalize_hook;
  69   gpointer          dummy[2];
  70 };
  71 struct _GHook
  72 {
  73   gpointer       data;
  74   GHook         *next;
  75   GHook         *prev;
  76   guint          ref_count;
  77   gulong         hook_id;
  78   guint          flags;
  79   gpointer       func;
  80   GDestroyNotify destroy;
  81 };
  82
  83
  84 /* --- macros --- */
  85 #define G_HOOK(hook)                    ((GHook*) (hook))
  86 #define G_HOOK_FLAGS(hook)              (G_HOOK (hook)->flags)
  87 #define G_HOOK_ACTIVE(hook)             ((G_HOOK_FLAGS (hook) & \
  88                                           G_HOOK_FLAG_ACTIVE) != 0)
  89 #define G_HOOK_IN_CALL(hook)            ((G_HOOK_FLAGS (hook) & \
  90                                           G_HOOK_FLAG_IN_CALL) != 0)
  91 #define G_HOOK_IS_VALID(hook)           (G_HOOK (hook)->hook_id != 0 && \
  92                                          (G_HOOK_FLAGS (hook) & \
  93                                           G_HOOK_FLAG_ACTIVE))
  94 #define G_HOOK_IS_UNLINKED(hook)        (G_HOOK (hook)->next == NULL && \
  95                                          G_HOOK (hook)->prev == NULL && \
  96                                          G_HOOK (hook)->hook_id == 0 && \
  97                                          G_HOOK (hook)->ref_count == 0)
  98
  99
 100 /* --- prototypes --- */
 101 /* callback maintenance functions */
 102 void     g_hook_list_init               (GHookList              *hook_list,
 103                                          guint                   hook_size);
 104 void     g_hook_list_clear              (GHookList              *hook_list);
 105 GHook*   g_hook_alloc                   (GHookList              *hook_list);
 106 void     g_hook_free                    (GHookList              *hook_list,
 107                                          GHook                  *hook);
 108 GHook *  g_hook_ref                     (GHookList              *hook_list,
 109                                          GHook                  *hook);
 110 void     g_hook_unref                   (GHookList              *hook_list,
 111                                          GHook                  *hook);
 112 gboolean g_hook_destroy                 (GHookList              *hook_list,
 113                                          gulong                  hook_id);
 114 void     g_hook_destroy_link            (GHookList              *hook_list,
 115                                          GHook                  *hook);
 116 void     g_hook_prepend                 (GHookList              *hook_list,
 117                                          GHook                  *hook);
 118 void     g_hook_insert_before           (GHookList              *hook_list,
 119                                          GHook                  *sibling,
 120                                          GHook                  *hook);
 121 void     g_hook_insert_sorted           (GHookList              *hook_list,
 122                                          GHook                  *hook,
 123                                          GHookCompareFunc        func);
 124 GHook*   g_hook_get                     (GHookList              *hook_list,
 125                                          gulong                  hook_id);
 126 GHook*   g_hook_find                    (GHookList              *hook_list,
 127                                          gboolean                need_valids,
 128                                          GHookFindFunc           func,
 129                                          gpointer                data);
 130 GHook*   g_hook_find_data               (GHookList              *hook_list,
 131                                          gboolean                need_valids,
 132                                          gpointer                data);
 133 GHook*   g_hook_find_func               (GHookList              *hook_list,
 134                                          gboolean                need_valids,
 135                                          gpointer                func);
 136 GHook*   g_hook_find_func_data          (GHookList              *hook_list,
 137                                          gboolean                need_valids,
 138                                          gpointer                func,
 139                                          gpointer                data);
 140 /* return the first valid hook, and increment its reference count */
 141 GHook*   g_hook_first_valid             (GHookList              *hook_list,
 142                                          gboolean                may_be_in_call);
 143 /* return the next valid hook with incremented reference count, and
 144  * decrement the reference count of the original hook
 145  */
 146 GHook*   g_hook_next_valid              (GHookList              *hook_list,
 147                                          GHook                  *hook,
 148                                          gboolean                may_be_in_call);
 149 /* GHookCompareFunc implementation to insert hooks sorted by their id */
 150 gint     g_hook_compare_ids             (GHook                  *new_hook,
 151                                          GHook                  *sibling);
 152 /* convenience macros */
 153 #define  g_hook_append( hook_list, hook )  \
 154      g_hook_insert_before ((hook_list), NULL, (hook))
 155 /* invoke all valid hooks with the (*GHookFunc) signature.
 156  */
 157 void     g_hook_list_invoke             (GHookList              *hook_list,
 158                                          gboolean                may_recurse);
 159 /* invoke all valid hooks with the (*GHookCheckFunc) signature,
 160  * and destroy the hook if FALSE is returned.
 161  */
 162 void     g_hook_list_invoke_check       (GHookList              *hook_list,
 163                                          gboolean                may_recurse);
 164 /* invoke a marshaller on all valid hooks.
 165  */
 166 void     g_hook_list_marshal            (GHookList              *hook_list,
 167                                          gboolean                may_recurse,
 168                                          GHookMarshaller         marshaller,
 169                                          gpointer                marshal_data);
 170 void     g_hook_list_marshal_check      (GHookList              *hook_list,
 171                                          gboolean                may_recurse,
 172                                          GHookCheckMarshaller    marshaller,
 173                                          gpointer                marshal_data);
 174
 175 G_END_DECLS
 176
 177 #endif /* __G_HOOK_H__ */
 178