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, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Author: Ryan Lortie <desrt@desrt.ca>
  19  */
  20
  21 #ifndef __G_BITLOCK_H__
  22 #define __G_BITLOCK_H__
  23
  24 #include <glib/gtypes.h>
  25
  26 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  27 #error "Only <glib.h> can be included directly."
  28 #endif
  29
  30 G_BEGIN_DECLS
  31
  32 GLIB_AVAILABLE_IN_ALL
  33 void      g_bit_lock                      (volatile gint *address,
  34                                            gint           lock_bit);
  35 GLIB_AVAILABLE_IN_ALL
  36 gboolean  g_bit_trylock                   (volatile gint *address,
  37                                            gint           lock_bit);
  38 GLIB_AVAILABLE_IN_ALL
  39 void      g_bit_unlock                    (volatile gint *address,
  40                                            gint           lock_bit);
  41
  42 GLIB_AVAILABLE_IN_ALL
  43 void      g_pointer_bit_lock              (volatile void *address,
  44                                            gint           lock_bit);
  45 GLIB_AVAILABLE_IN_ALL
  46 gboolean  g_pointer_bit_trylock           (volatile void *address,
  47                                            gint           lock_bit);
  48 GLIB_AVAILABLE_IN_ALL
  49 void      g_pointer_bit_unlock            (volatile void *address,
  50                                            gint           lock_bit);
  51
  52 #ifdef __GNUC__
  53
  54 #define g_pointer_bit_lock(address, lock_bit) \
  55   (G_GNUC_EXTENSION ({                                                       \
  56     G_STATIC_ASSERT (sizeof *(address) == sizeof (gpointer));                \
  57     g_pointer_bit_lock ((address), (lock_bit));                              \
  58   }))
  59
  60 #define g_pointer_bit_trylock(address, lock_bit) \
  61   (G_GNUC_EXTENSION ({                                                       \
  62     G_STATIC_ASSERT (sizeof *(address) == sizeof (gpointer));                \
  63     g_pointer_bit_trylock ((address), (lock_bit));                           \
  64   }))
  65
  66 #define g_pointer_bit_unlock(address, lock_bit) \
  67   (G_GNUC_EXTENSION ({                                                       \
  68     G_STATIC_ASSERT (sizeof *(address) == sizeof (gpointer));                \
  69     g_pointer_bit_unlock ((address), (lock_bit));                            \
  70   }))
  71
  72 #endif
  73
  74 G_END_DECLS
  75
  76 #endif /* __G_BITLOCK_H_ */