glib/gbitlock.h

   1 /*
   2  * Copyright © 2008 Ryan Lortie
   3  * Copyright © 2010 Codethink Limited
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the licence, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: Ryan Lortie <desrt@desrt.ca>
  21  */
  22
  23 #ifndef __G_BITLOCK_H__
  24 #define __G_BITLOCK_H__
  25
  26 #include <glib/gtypes.h>
  27
  28 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  29 #error "Only <glib.h> can be included directly."
  30 #endif
  31
  32 G_BEGIN_DECLS
  33
  34 GLIB_AVAILABLE_IN_ALL
  35 void      g_bit_lock                      (volatile gint *address,
  36                                            gint           lock_bit);
  37 GLIB_AVAILABLE_IN_ALL
  38 gboolean  g_bit_trylock                   (volatile gint *address,
  39                                            gint           lock_bit);
  40 GLIB_AVAILABLE_IN_ALL
  41 void      g_bit_unlock                    (volatile gint *address,
  42                                            gint           lock_bit);
  43
  44 GLIB_AVAILABLE_IN_ALL
  45 void      g_pointer_bit_lock              (volatile void *address,
  46                                            gint           lock_bit);
  47 GLIB_AVAILABLE_IN_ALL
  48 gboolean  g_pointer_bit_trylock           (volatile void *address,
  49                                            gint           lock_bit);
  50 GLIB_AVAILABLE_IN_ALL
  51 void      g_pointer_bit_unlock            (volatile void *address,
  52                                            gint           lock_bit);
  53
  54 #ifdef __GNUC__
  55
  56 #define g_pointer_bit_lock(address, lock_bit) \
  57   (G_GNUC_EXTENSION ({                                                       \
  58     G_STATIC_ASSERT (sizeof *(address) == sizeof (gpointer));                \
  59     g_pointer_bit_lock ((address), (lock_bit));                              \
  60   }))
  61
  62 #define g_pointer_bit_trylock(address, lock_bit) \
  63   (G_GNUC_EXTENSION ({                                                       \
  64     G_STATIC_ASSERT (sizeof *(address) == sizeof (gpointer));                \
  65     g_pointer_bit_trylock ((address), (lock_bit));                           \
  66   }))
  67
  68 #define g_pointer_bit_unlock(address, lock_bit) \
  69   (G_GNUC_EXTENSION ({                                                       \
  70     G_STATIC_ASSERT (sizeof *(address) == sizeof (gpointer));                \
  71     g_pointer_bit_unlock ((address), (lock_bit));                            \
  72   }))
  73
  74 #endif
  75
  76 G_END_DECLS
  77
  78 #endif /* __G_BITLOCK_H_ */