glib/gatomic.h

   1 /*
   2  * Copyright © 2011 Ryan Lortie
   3  *
   4  * This library is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * licence, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful, but
  10  * 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 Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17  * USA.
  18  *
  19  * Author: Ryan Lortie <desrt@desrt.ca>
  20  */
  21
  22 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  23 #error "Only <glib.h> can be included directly."
  24 #endif
  25
  26 #ifndef __G_ATOMIC_H__
  27 #define __G_ATOMIC_H__
  28
  29 #include <glib/gtypes.h>
  30
  31 G_BEGIN_DECLS
  32
  33 gint                    g_atomic_int_get                      (volatile gint  *atomic);
  34 void                    g_atomic_int_set                      (volatile gint  *atomic,
  35                                                                gint            newval);
  36 void                    g_atomic_int_inc                      (volatile gint  *atomic);
  37 gboolean                g_atomic_int_dec_and_test             (volatile gint  *atomic);
  38 gboolean                g_atomic_int_compare_and_exchange     (volatile gint  *atomic,
  39                                                                gint            oldval,
  40                                                                gint            newval);
  41 gint                    g_atomic_int_add                      (volatile gint  *atomic,
  42                                                                gint            val);
  43 guint                   g_atomic_int_and                      (volatile guint *atomic,
  44                                                                guint           val);
  45 guint                   g_atomic_int_or                       (volatile guint *atomic,
  46                                                                guint           val);
  47 guint                   g_atomic_int_xor                      (volatile guint *atomic,
  48                                                                guint           val);
  49
  50 gpointer                g_atomic_pointer_get                  (volatile void  *atomic);
  51 void                    g_atomic_pointer_set                  (volatile void  *atomic,
  52                                                                gpointer        newval);
  53 gboolean                g_atomic_pointer_compare_and_exchange (volatile void  *atomic,
  54                                                                gpointer        oldval,
  55                                                                gpointer        newval);
  56 gssize                  g_atomic_pointer_add                  (volatile void  *atomic,
  57                                                                gssize          val);
  58 gsize                   g_atomic_pointer_and                  (volatile void  *atomic,
  59                                                                gsize           val);
  60 gsize                   g_atomic_pointer_or                   (volatile void  *atomic,
  61                                                                gsize           val);
  62 gsize                   g_atomic_pointer_xor                  (volatile void  *atomic,
  63                                                                gsize           val);
  64
  65 GLIB_DEPRECATED_IN_2_30_FOR(g_atomic_add)
  66 gint                    g_atomic_int_exchange_and_add         (volatile gint  *atomic,
  67                                                                gint            val);
  68
  69 G_END_DECLS
  70
  71 #if defined(G_ATOMIC_LOCK_FREE) && defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)
  72
  73 #define g_atomic_int_get(atomic) \
  74   (G_GNUC_EXTENSION ({                                                          \
  75     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
  76     (void) (0 ? *(atomic) ^ *(atomic) : 0);                                  \
  77     __sync_synchronize ();                                                   \
  78     (gint) *(atomic);                                                        \
  79   }))
  80 #define g_atomic_int_set(atomic, newval) \
  81   (G_GNUC_EXTENSION ({                                                          \
  82     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
  83     (void) (0 ? *(atomic) ^ (newval) : 0);                                   \
  84     *(atomic) = (newval);                                                    \
  85     __sync_synchronize ();                                                   \
  86   }))
  87 #define g_atomic_int_inc(atomic) \
  88   (G_GNUC_EXTENSION ({                                                          \
  89     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
  90     (void) (0 ? *(atomic) ^ *(atomic) : 0);                                  \
  91     (void) __sync_fetch_and_add ((atomic), 1);                               \
  92   }))
  93 #define g_atomic_int_dec_and_test(atomic) \
  94   (G_GNUC_EXTENSION ({                                                          \
  95     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
  96     (void) (0 ? *(atomic) ^ *(atomic) : 0);                                  \
  97     __sync_fetch_and_sub ((atomic), 1) == 1;                                 \
  98   }))
  99 #define g_atomic_int_compare_and_exchange(atomic, oldval, newval) \
 100   (G_GNUC_EXTENSION ({                                                          \
 101     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 102     (void) (0 ? *(atomic) ^ (newval) ^ (oldval) : 0);                        \
 103     (gboolean) __sync_bool_compare_and_swap ((atomic), (oldval), (newval));  \
 104   }))
 105 #define g_atomic_int_add(atomic, val) \
 106   (G_GNUC_EXTENSION ({                                                          \
 107     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 108     (void) (0 ? *(atomic) ^ (val) : 0);                                      \
 109     (gint) __sync_fetch_and_add ((atomic), (val));                           \
 110   }))
 111 #define g_atomic_int_and(atomic, val) \
 112   (G_GNUC_EXTENSION ({                                                          \
 113     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 114     (void) (0 ? *(atomic) ^ (val) : 0);                                      \
 115     (guint) __sync_fetch_and_and ((atomic), (val));                          \
 116   }))
 117 #define g_atomic_int_or(atomic, val) \
 118   (G_GNUC_EXTENSION ({                                                          \
 119     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 120     (void) (0 ? *(atomic) ^ (val) : 0);                                      \
 121     (guint) __sync_fetch_and_or ((atomic), (val));                           \
 122   }))
 123 #define g_atomic_int_xor(atomic, val) \
 124   (G_GNUC_EXTENSION ({                                                          \
 125     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 126     (void) (0 ? *(atomic) ^ (val) : 0);                                      \
 127     (guint) __sync_fetch_and_xor ((atomic), (val));                          \
 128   }))
 129
 130 #define g_atomic_pointer_get(atomic) \
 131   (G_GNUC_EXTENSION ({                                                          \
 132     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 133     __sync_synchronize ();                                                   \
 134     (gpointer) *(atomic);                                                    \
 135   }))
 136 #define g_atomic_pointer_set(atomic, newval) \
 137   (G_GNUC_EXTENSION ({                                                          \
 138     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 139     (void) (0 ? (gpointer) *(atomic) : 0);                                   \
 140     *(atomic) = (__typeof__ (*(atomic))) (gsize) (newval);                   \
 141     __sync_synchronize ();                                                   \
 142   }))
 143 #define g_atomic_pointer_compare_and_exchange(atomic, oldval, newval) \
 144   (G_GNUC_EXTENSION ({                                                          \
 145     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 146     (void) (0 ? (gpointer) *(atomic) : 0);                                   \
 147     (gboolean) __sync_bool_compare_and_swap ((atomic), (oldval), (newval));  \
 148   }))
 149 #define g_atomic_pointer_add(atomic, val) \
 150   (G_GNUC_EXTENSION ({                                                          \
 151     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 152     (void) (0 ? (gpointer) *(atomic) : 0);                                   \
 153     (void) (0 ? (val) ^ (val) : 0);                                          \
 154     (gssize) __sync_fetch_and_add ((atomic), (val));                         \
 155   }))
 156 #define g_atomic_pointer_and(atomic, val) \
 157   (G_GNUC_EXTENSION ({                                                          \
 158     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 159     (void) (0 ? (gpointer) *(atomic) : 0);                                   \
 160     (void) (0 ? (val) ^ (val) : 0);                                          \
 161     (gsize) __sync_fetch_and_and ((atomic), (val));                          \
 162   }))
 163 #define g_atomic_pointer_or(atomic, val) \
 164   (G_GNUC_EXTENSION ({                                                          \
 165     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 166     (void) (0 ? (gpointer) *(atomic) : 0);                                   \
 167     (void) (0 ? (val) ^ (val) : 0);                                          \
 168     (gsize) __sync_fetch_and_or ((atomic), (val));                           \
 169   }))
 170 #define g_atomic_pointer_xor(atomic, val) \
 171   (G_GNUC_EXTENSION ({                                                          \
 172     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 173     (void) (0 ? (gpointer) *(atomic) : 0);                                   \
 174     (void) (0 ? (val) ^ (val) : 0);                                          \
 175     (gsize) __sync_fetch_and_xor ((atomic), (val));                          \
 176   }))
 177
 178 #else /* defined(G_ATOMIC_LOCK_FREE) && defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4) */
 179
 180 #define g_atomic_int_get(atomic) \
 181   (g_atomic_int_get ((gint *) (atomic)))
 182 #define g_atomic_int_set(atomic, newval) \
 183   (g_atomic_int_set ((gint *) (atomic), (gint) (newval)))
 184 #define g_atomic_int_compare_and_exchange(atomic, oldval, newval) \
 185   (g_atomic_int_compare_and_exchange ((gint *) (atomic), (oldval), (newval)))
 186 #define g_atomic_int_add(atomic, val) \
 187   (g_atomic_int_add ((gint *) (atomic), (val)))
 188 #define g_atomic_int_and(atomic, val) \
 189   (g_atomic_int_and ((guint *) (atomic), (val)))
 190 #define g_atomic_int_or(atomic, val) \
 191   (g_atomic_int_or ((guint *) (atomic), (val)))
 192 #define g_atomic_int_xor(atomic, val) \
 193   (g_atomic_int_xor ((guint *) (atomic), (val)))
 194 #define g_atomic_int_inc(atomic) \
 195   (g_atomic_int_inc ((gint *) (atomic)))
 196 #define g_atomic_int_dec_and_test(atomic) \
 197   (g_atomic_int_dec_and_test ((gint *) (atomic)))
 198
 199 #define g_atomic_pointer_get(atomic) \
 200   (g_atomic_pointer_get (atomic))
 201 #define g_atomic_pointer_set(atomic, newval) \
 202   (g_atomic_pointer_set ((atomic), (gpointer) (newval)))
 203 #define g_atomic_pointer_compare_and_exchange(atomic, oldval, newval) \
 204   (g_atomic_pointer_compare_and_exchange ((atomic), (gpointer) (oldval), (gpointer) (newval)))
 205 #define g_atomic_pointer_add(atomic, val) \
 206   (g_atomic_pointer_add ((atomic), (gssize) (val)))
 207 #define g_atomic_pointer_and(atomic, val) \
 208   (g_atomic_pointer_and ((atomic), (gsize) (val)))
 209 #define g_atomic_pointer_or(atomic, val) \
 210   (g_atomic_pointer_or ((atomic), (gsize) (val)))
 211 #define g_atomic_pointer_xor(atomic, val) \
 212   (g_atomic_pointer_xor ((atomic), (gsize) (val)))
 213
 214 #endif /* defined(__GNUC__) && defined(G_ATOMIC_OP_USE_GCC_BUILTINS) */
 215
 216 #endif /* __G_ATOMIC_H__ */