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 <gmem.h>
  31
  32 G_BEGIN_DECLS
  33
  34 typedef struct _GHook           GHook;
  35 typedef struct _GHookList       GHookList;
  36
  37 typedef gint            (*GHookCompareFunc)     (GHook          *new_hook,
  38                                                  GHook          *sibling);
  39 typedef gboolean        (*GHookFindFunc)        (GHook          *hook,
  40                                                  gpointer        data);
  41 typedef void            (*GHookMarshaller)      (GHook          *hook,
  42                                                  gpointer        data);
  43 typedef gboolean        (*GHookCheckMarshaller) (GHook          *hook,
  44                                                  gpointer        data);
  45 typedef void            (*GHookFunc)            (gpointer        data);
  46 typedef gboolean        (*GHookCheckFunc)       (gpointer        data);
  47 typedef void            (*GHookFreeFunc)        (GHookList      *hook_list,
  48                                                  GHook          *hook);
  49
  50 /* Callback maintenance functions
  51  */
  52 #define G_HOOK_FLAG_USER_SHIFT  (4)
  53 typedef enum
  54 {
  55   G_HOOK_FLAG_ACTIVE    = 1 << 0,
  56   G_HOOK_FLAG_IN_CALL   = 1 << 1,
  57   G_HOOK_FLAG_MASK      = 0x0f
  58 } GHookFlagMask;
  59
  60 #define G_HOOK_DEFERRED_DESTROY ((GHookFreeFunc) 0x01)
  61
  62 struct _GHookList
  63 {
  64   guint          seq_id;
  65   guint          hook_size;
  66   guint          is_setup : 1;
  67   GHook         *hooks;
  68   GMemChunk     *hook_memchunk;
  69   GHookFreeFunc  hook_free; /* virtual function */
  70   GHookFreeFunc  hook_destroy; /* virtual function */
  71 };
  72
  73 struct _GHook
  74 {
  75   gpointer       data;
  76   GHook         *next;
  77   GHook         *prev;
  78   guint          ref_count;
  79   guint          hook_id;
  80   guint          flags;
  81   gpointer       func;
  82   GDestroyNotify destroy;
  83 };
  84
  85 #define G_HOOK_ACTIVE(hook)             ((((GHook*) hook)->flags & \
  86                                           G_HOOK_FLAG_ACTIVE) != 0)
  87 #define G_HOOK_IN_CALL(hook)            ((((GHook*) hook)->flags & \
  88                                           G_HOOK_FLAG_IN_CALL) != 0)
  89 #define G_HOOK_IS_VALID(hook)           (((GHook*) hook)->hook_id != 0 && \
  90                                          G_HOOK_ACTIVE (hook))
  91 #define G_HOOK_IS_UNLINKED(hook)        (((GHook*) hook)->next == NULL && \
  92                                          ((GHook*) hook)->prev == NULL && \
  93                                          ((GHook*) hook)->hook_id == 0 && \
  94                                          ((GHook*) hook)->ref_count == 0)
  95
  96 void     g_hook_list_init               (GHookList              *hook_list,
  97                                          guint                   hook_size);
  98 void     g_hook_list_clear              (GHookList              *hook_list);
  99 GHook*   g_hook_alloc                   (GHookList              *hook_list);
 100 void     g_hook_free                    (GHookList              *hook_list,
 101                                          GHook                  *hook);
 102 void     g_hook_ref                     (GHookList              *hook_list,
 103                                          GHook                  *hook);
 104 void     g_hook_unref                   (GHookList              *hook_list,
 105                                          GHook                  *hook);
 106 gboolean g_hook_destroy                 (GHookList              *hook_list,
 107                                          guint                   hook_id);
 108 void     g_hook_destroy_link            (GHookList              *hook_list,
 109                                          GHook                  *hook);
 110 void     g_hook_prepend                 (GHookList              *hook_list,
 111                                          GHook                  *hook);
 112 void     g_hook_insert_before           (GHookList              *hook_list,
 113                                          GHook                  *sibling,
 114                                          GHook                  *hook);
 115 void     g_hook_insert_sorted           (GHookList              *hook_list,
 116                                          GHook                  *hook,
 117                                          GHookCompareFunc        func);
 118 GHook*   g_hook_get                     (GHookList              *hook_list,
 119                                          guint                   hook_id);
 120 GHook*   g_hook_find                    (GHookList              *hook_list,
 121                                          gboolean                need_valids,
 122                                          GHookFindFunc           func,
 123                                          gpointer                data);
 124 GHook*   g_hook_find_data               (GHookList              *hook_list,
 125                                          gboolean                need_valids,
 126                                          gpointer                data);
 127 GHook*   g_hook_find_func               (GHookList              *hook_list,
 128                                          gboolean                need_valids,
 129                                          gpointer                func);
 130 GHook*   g_hook_find_func_data          (GHookList              *hook_list,
 131                                          gboolean                need_valids,
 132                                          gpointer                func,
 133                                          gpointer                data);
 134 /* return the first valid hook, and increment its reference count */
 135 GHook*   g_hook_first_valid             (GHookList              *hook_list,
 136                                          gboolean                may_be_in_call);
 137 /* return the next valid hook with incremented reference count, and
 138  * decrement the reference count of the original hook
 139  */
 140 GHook*   g_hook_next_valid              (GHookList              *hook_list,
 141                                          GHook                  *hook,
 142                                          gboolean                may_be_in_call);
 143
 144 /* GHookCompareFunc implementation to insert hooks sorted by their id */
 145 gint     g_hook_compare_ids             (GHook                  *new_hook,
 146                                          GHook                  *sibling);
 147
 148 /* convenience macros */
 149 #define  g_hook_append( hook_list, hook )  \
 150      g_hook_insert_before ((hook_list), NULL, (hook))
 151
 152 /* invoke all valid hooks with the (*GHookFunc) signature.
 153  */
 154 void     g_hook_list_invoke             (GHookList              *hook_list,
 155                                          gboolean                may_recurse);
 156 /* invoke all valid hooks with the (*GHookCheckFunc) signature,
 157  * and destroy the hook if FALSE is returned.
 158  */
 159 void     g_hook_list_invoke_check       (GHookList              *hook_list,
 160                                          gboolean                may_recurse);
 161 /* invoke a marshaller on all valid hooks.
 162  */
 163 void     g_hook_list_marshal            (GHookList              *hook_list,
 164                                          gboolean                may_recurse,
 165                                          GHookMarshaller         marshaller,
 166                                          gpointer                data);
 167 void     g_hook_list_marshal_check      (GHookList              *hook_list,
 168                                          gboolean                may_recurse,
 169                                          GHookCheckMarshaller    marshaller,
 170                                          gpointer                data);
 171
 172 G_END_DECLS
 173
 174 #endif /* __G_HOOK_H__ */
 175