gobject/gatomicarray.h

   1 /* GObject - GLib Type, Object, Parameter and Signal Library
   2  * Copyright (C) 2009 Benjamin Otte <otte@gnome.org>
   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 2.1 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
  15  * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17 #ifndef __G_ATOMIC_ARRAY_H__
  18 #define __G_ATOMIC_ARRAY_H__
  19
  20 #if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION)
  21 #error "Only <glib-object.h> can be included directly."
  22 #endif
  23
  24 #include <glib/glib.h>
  25
  26 G_BEGIN_DECLS
  27
  28 #define G_ATOMIC_ARRAY_DATA_SIZE(mem) (*((gsize *) (mem) - 1))
  29
  30 typedef struct _GAtomicArray GAtomicArray;
  31 struct _GAtomicArray {
  32   volatile gpointer data;               /* elements - atomic */
  33 };
  34
  35 void     _g_atomic_array_init   (GAtomicArray *array);
  36 gpointer _g_atomic_array_copy   (GAtomicArray *array,
  37                                  gsize         header_size,
  38                                  gsize         additional_element_size);
  39 void     _g_atomic_array_update (GAtomicArray *array,
  40                                  gpointer      new_data);
  41
  42 #define  G_ATOMIC_ARRAY_GET_LOCKED(_array, _type) ((_type *)((_array)->data))
  43
  44 #define G_ATOMIC_ARRAY_DO_TRANSACTION(_array, _type, _C_) G_STMT_START {        \
  45     volatile gpointer *_datap  = &(_array)->data;                               \
  46     _type *transaction_data, *__check;                                          \
  47                                                                                 \
  48     __check = g_atomic_pointer_get (_datap);                                    \
  49     do {                                                                        \
  50       transaction_data = __check;                                               \
  51       {_C_;}                                                                    \
  52       __check = g_atomic_pointer_get (_datap);                                  \
  53     } while (transaction_data != __check);                                      \
  54   } G_STMT_END
  55
  56 G_END_DECLS
  57
  58 #endif  /* __G_ATOMIC_ARRAY_H__ */