glib/gatomic.h

   1 /*
   2  * Copyright © 2011 Ryan Lortie
   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, 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, see <http://www.gnu.org/licenses/>.
  16  *
  17  * Author: Ryan Lortie <desrt@desrt.ca>
  18  */
  19
  20 #ifndef __G_ATOMIC_H__
  21 #define __G_ATOMIC_H__
  22
  23 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  24 #error "Only <glib.h> can be included directly."
  25 #endif
  26
  27 #include <glib/gtypes.h>
  28
  29 G_BEGIN_DECLS
  30
  31 GLIB_AVAILABLE_IN_ALL
  32 gint                    g_atomic_int_get                      (const volatile gint *atomic);
  33 GLIB_AVAILABLE_IN_ALL
  34 void                    g_atomic_int_set                      (volatile gint  *atomic,
  35                                                                gint            newval);
  36 GLIB_AVAILABLE_IN_ALL
  37 void                    g_atomic_int_inc                      (volatile gint  *atomic);
  38 GLIB_AVAILABLE_IN_ALL
  39 gboolean                g_atomic_int_dec_and_test             (volatile gint  *atomic);
  40 GLIB_AVAILABLE_IN_ALL
  41 gboolean                g_atomic_int_compare_and_exchange     (volatile gint  *atomic,
  42                                                                gint            oldval,
  43                                                                gint            newval);
  44 GLIB_AVAILABLE_IN_ALL
  45 gint                    g_atomic_int_add                      (volatile gint  *atomic,
  46                                                                gint            val);
  47 GLIB_AVAILABLE_IN_2_30
  48 guint                   g_atomic_int_and                      (volatile guint *atomic,
  49                                                                guint           val);
  50 GLIB_AVAILABLE_IN_2_30
  51 guint                   g_atomic_int_or                       (volatile guint *atomic,
  52                                                                guint           val);
  53 GLIB_AVAILABLE_IN_ALL
  54 guint                   g_atomic_int_xor                      (volatile guint *atomic,
  55                                                                guint           val);
  56
  57 GLIB_AVAILABLE_IN_ALL
  58 gpointer                g_atomic_pointer_get                  (const volatile void *atomic);
  59 GLIB_AVAILABLE_IN_ALL
  60 void                    g_atomic_pointer_set                  (volatile void  *atomic,
  61                                                                gpointer        newval);
  62 GLIB_AVAILABLE_IN_ALL
  63 gboolean                g_atomic_pointer_compare_and_exchange (volatile void  *atomic,
  64                                                                gpointer        oldval,
  65                                                                gpointer        newval);
  66 GLIB_AVAILABLE_IN_ALL
  67 gssize                  g_atomic_pointer_add                  (volatile void  *atomic,
  68                                                                gssize          val);
  69 GLIB_AVAILABLE_IN_2_30
  70 gsize                   g_atomic_pointer_and                  (volatile void  *atomic,
  71                                                                gsize           val);
  72 GLIB_AVAILABLE_IN_2_30
  73 gsize                   g_atomic_pointer_or                   (volatile void  *atomic,
  74                                                                gsize           val);
  75 GLIB_AVAILABLE_IN_ALL
  76 gsize                   g_atomic_pointer_xor                  (volatile void  *atomic,
  77                                                                gsize           val);
  78
  79 GLIB_DEPRECATED_IN_2_30_FOR(g_atomic_int_add)
  80 gint                    g_atomic_int_exchange_and_add         (volatile gint  *atomic,
  81                                                                gint            val);
  82
  83 G_END_DECLS
  84
  85 #if defined(G_ATOMIC_LOCK_FREE) && defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)
  86
  87 /* We prefer the new C11-style atomic extension of GCC if available */
  88 #if defined(__ATOMIC_SEQ_CST)
  89
  90 #define g_atomic_int_get(atomic) \
  91   (G_GNUC_EXTENSION ({                                                       \
  92     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
  93     gint gaig_temp;                                                          \
  94     (void) (0 ? *(atomic) ^ *(atomic) : 1);                                  \
  95     __atomic_load ((gint *)(atomic), &gaig_temp, __ATOMIC_SEQ_CST);          \
  96     (gint) gaig_temp;                                                        \
  97   }))
  98 #define g_atomic_int_set(atomic, newval) \
  99   (G_GNUC_EXTENSION ({                                                       \
 100     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 101     gint gais_temp = (gint) (newval);                                        \
 102     (void) (0 ? *(atomic) ^ (newval) : 1);                                   \
 103     __atomic_store ((gint *)(atomic), &gais_temp, __ATOMIC_SEQ_CST);         \
 104   }))
 105
 106 #if defined(g_has_typeof)
 107 #define g_atomic_pointer_get(atomic) \
 108   (G_GNUC_EXTENSION ({                                                       \
 109     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 110     __typeof__(*(atomic)) gapg_temp_newval;                                  \
 111     __typeof__((atomic)) gapg_temp_atomic = (atomic);                        \
 112     __atomic_load (gapg_temp_atomic, &gapg_temp_newval, __ATOMIC_SEQ_CST);   \
 113     gapg_temp_newval;                                                        \
 114   }))
 115 #define g_atomic_pointer_set(atomic, newval) \
 116   (G_GNUC_EXTENSION ({                                                       \
 117     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 118     __typeof__((atomic)) gaps_temp_atomic = (atomic);                        \
 119     __typeof__(*(atomic)) gaps_temp_newval = (newval);                       \
 120     (void) (0 ? (gpointer) *(atomic) : NULL);                                \
 121     __atomic_store (gaps_temp_atomic, &gaps_temp_newval, __ATOMIC_SEQ_CST);  \
 122   }))
 123 #else  /* if !defined(g_has_typeof) */
 124 #define g_atomic_pointer_get(atomic) \
 125   (G_GNUC_EXTENSION ({                                                       \
 126     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 127     gpointer gapg_temp_newval;                                               \
 128     gpointer *gapg_temp_atomic = (gpointer *)(atomic);                       \
 129     __atomic_load (gapg_temp_atomic, &gapg_temp_newval, __ATOMIC_SEQ_CST);   \
 130     gapg_temp_newval;                                                        \
 131   }))
 132 #define g_atomic_pointer_set(atomic, newval) \
 133   (G_GNUC_EXTENSION ({                                                       \
 134     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 135     gpointer *gaps_temp_atomic = (gpointer *)(atomic);                       \
 136     gpointer gaps_temp_newval = (gpointer)(newval);                          \
 137     (void) (0 ? (gpointer) *(atomic) : NULL);                                \
 138     __atomic_store (gaps_temp_atomic, &gaps_temp_newval, __ATOMIC_SEQ_CST);  \
 139   }))
 140 #endif  /* !defined(g_has_typeof) */
 141
 142 #define g_atomic_int_inc(atomic) \
 143   (G_GNUC_EXTENSION ({                                                       \
 144     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 145     (void) (0 ? *(atomic) ^ *(atomic) : 1);                                  \
 146     (void) __atomic_fetch_add ((atomic), 1, __ATOMIC_SEQ_CST);               \
 147   }))
 148 #define g_atomic_int_dec_and_test(atomic) \
 149   (G_GNUC_EXTENSION ({                                                       \
 150     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 151     (void) (0 ? *(atomic) ^ *(atomic) : 1);                                  \
 152     __atomic_fetch_sub ((atomic), 1, __ATOMIC_SEQ_CST) == 1;                 \
 153   }))
 154 #define g_atomic_int_compare_and_exchange(atomic, oldval, newval) \
 155   (G_GNUC_EXTENSION ({                                                       \
 156     gint gaicae_oldval = (oldval);                                           \
 157     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 158     (void) (0 ? *(atomic) ^ (newval) ^ (oldval) : 1);                        \
 159     __atomic_compare_exchange_n ((atomic), &gaicae_oldval, (newval), FALSE, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) ? TRUE : FALSE; \
 160   }))
 161 #define g_atomic_int_add(atomic, val) \
 162   (G_GNUC_EXTENSION ({                                                       \
 163     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 164     (void) (0 ? *(atomic) ^ (val) : 1);                                      \
 165     (gint) __atomic_fetch_add ((atomic), (val), __ATOMIC_SEQ_CST);           \
 166   }))
 167 #define g_atomic_int_and(atomic, val) \
 168   (G_GNUC_EXTENSION ({                                                       \
 169     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 170     (void) (0 ? *(atomic) ^ (val) : 1);                                      \
 171     (guint) __atomic_fetch_and ((atomic), (val), __ATOMIC_SEQ_CST);          \
 172   }))
 173 #define g_atomic_int_or(atomic, val) \
 174   (G_GNUC_EXTENSION ({                                                       \
 175     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 176     (void) (0 ? *(atomic) ^ (val) : 1);                                      \
 177     (guint) __atomic_fetch_or ((atomic), (val), __ATOMIC_SEQ_CST);           \
 178   }))
 179 #define g_atomic_int_xor(atomic, val) \
 180   (G_GNUC_EXTENSION ({                                                       \
 181     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 182     (void) (0 ? *(atomic) ^ (val) : 1);                                      \
 183     (guint) __atomic_fetch_xor ((atomic), (val), __ATOMIC_SEQ_CST);          \
 184   }))
 185
 186 #define g_atomic_pointer_compare_and_exchange(atomic, oldval, newval) \
 187   (G_GNUC_EXTENSION ({                                                       \
 188     G_STATIC_ASSERT (sizeof (oldval) == sizeof (gpointer));                  \
 189     __typeof__ ((oldval)) gapcae_oldval = (oldval);                          \
 190     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 191     (void) (0 ? (gpointer) *(atomic) : NULL);                                \
 192     __atomic_compare_exchange_n ((atomic), &gapcae_oldval, (newval), FALSE, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) ? TRUE : FALSE; \
 193   }))
 194 #define g_atomic_pointer_add(atomic, val) \
 195   (G_GNUC_EXTENSION ({                                                       \
 196     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 197     (void) (0 ? (gpointer) *(atomic) : NULL);                                \
 198     (void) (0 ? (val) ^ (val) : 1);                                          \
 199     (gssize) __atomic_fetch_add ((atomic), (val), __ATOMIC_SEQ_CST);         \
 200   }))
 201 #define g_atomic_pointer_and(atomic, val) \
 202   (G_GNUC_EXTENSION ({                                                       \
 203     volatile gsize *gapa_atomic = (volatile gsize *) (atomic);               \
 204     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 205     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gsize));                    \
 206     (void) (0 ? (gpointer) *(atomic) : NULL);                                \
 207     (void) (0 ? (val) ^ (val) : 1);                                          \
 208     (gsize) __atomic_fetch_and (gapa_atomic, (val), __ATOMIC_SEQ_CST);       \
 209   }))
 210 #define g_atomic_pointer_or(atomic, val) \
 211   (G_GNUC_EXTENSION ({                                                       \
 212     volatile gsize *gapo_atomic = (volatile gsize *) (atomic);               \
 213     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 214     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gsize));                    \
 215     (void) (0 ? (gpointer) *(atomic) : NULL);                                \
 216     (void) (0 ? (val) ^ (val) : 1);                                          \
 217     (gsize) __atomic_fetch_or (gapo_atomic, (val), __ATOMIC_SEQ_CST);        \
 218   }))
 219 #define g_atomic_pointer_xor(atomic, val) \
 220   (G_GNUC_EXTENSION ({                                                       \
 221     volatile gsize *gapx_atomic = (volatile gsize *) (atomic);               \
 222     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 223     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gsize));                    \
 224     (void) (0 ? (gpointer) *(atomic) : NULL);                                \
 225     (void) (0 ? (val) ^ (val) : 1);                                          \
 226     (gsize) __atomic_fetch_xor (gapx_atomic, (val), __ATOMIC_SEQ_CST);       \
 227   }))
 228
 229 #else /* defined(__ATOMIC_SEQ_CST) */
 230
 231 /* We want to achieve __ATOMIC_SEQ_CST semantics here. See
 232  * https://en.cppreference.com/w/c/atomic/memory_order#Constants. For load
 233  * operations, that means performing an *acquire*:
 234  * > A load operation with this memory order performs the acquire operation on
 235  * > the affected memory location: no reads or writes in the current thread can
 236  * > be reordered before this load. All writes in other threads that release
 237  * > the same atomic variable are visible in the current thread.
 238  *
 239  * “no reads or writes in the current thread can be reordered before this load”
 240  * is implemented using a compiler barrier (a no-op `__asm__` section) to
 241  * prevent instruction reordering. Writes in other threads are synchronised
 242  * using `__sync_synchronize()`. It’s unclear from the GCC documentation whether
 243  * `__sync_synchronize()` acts as a compiler barrier, hence our explicit use of
 244  * one.
 245  *
 246  * For store operations, `__ATOMIC_SEQ_CST` means performing a *release*:
 247  * > A store operation with this memory order performs the release operation:
 248  * > no reads or writes in the current thread can be reordered after this store.
 249  * > All writes in the current thread are visible in other threads that acquire
 250  * > the same atomic variable (see Release-Acquire ordering below) and writes
 251  * > that carry a dependency into the atomic variable become visible in other
 252  * > threads that consume the same atomic (see Release-Consume ordering below).
 253  *
 254  * “no reads or writes in the current thread can be reordered after this store”
 255  * is implemented using a compiler barrier to prevent instruction reordering.
 256  * “All writes in the current thread are visible in other threads” is implemented
 257  * using `__sync_synchronize()`; similarly for “writes that carry a dependency”.
 258  */
 259 #define g_atomic_int_get(atomic) \
 260   (G_GNUC_EXTENSION ({                                                       \
 261     gint gaig_result;                                                        \
 262     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 263     (void) (0 ? *(atomic) ^ *(atomic) : 1);                                  \
 264     gaig_result = (gint) *(atomic);                                          \
 265     __sync_synchronize ();                                                   \
 266     __asm__ __volatile__ ("" : : : "memory");                                \
 267     gaig_result;                                                             \
 268   }))
 269 #define g_atomic_int_set(atomic, newval) \
 270   (G_GNUC_EXTENSION ({                                                       \
 271     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 272     (void) (0 ? *(atomic) ^ (newval) : 1);                                   \
 273     __sync_synchronize ();                                                   \
 274     __asm__ __volatile__ ("" : : : "memory");                                \
 275     *(atomic) = (newval);                                                    \
 276   }))
 277 #define g_atomic_pointer_get(atomic) \
 278   (G_GNUC_EXTENSION ({                                                       \
 279     gpointer gapg_result;                                                    \
 280     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 281     gapg_result = (gpointer) *(atomic);                                      \
 282     __sync_synchronize ();                                                   \
 283     __asm__ __volatile__ ("" : : : "memory");                                \
 284     gapg_result;                                                             \
 285   }))
 286 #define g_atomic_pointer_set(atomic, newval) \
 287   (G_GNUC_EXTENSION ({                                                       \
 288     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 289     (void) (0 ? (gpointer) *(atomic) : NULL);                                \
 290     __sync_synchronize ();                                                   \
 291     __asm__ __volatile__ ("" : : : "memory");                                \
 292     *(atomic) = (__typeof__ (*(atomic))) (gsize) (newval);                   \
 293   }))
 294
 295 #define g_atomic_int_inc(atomic) \
 296   (G_GNUC_EXTENSION ({                                                       \
 297     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 298     (void) (0 ? *(atomic) ^ *(atomic) : 1);                                  \
 299     (void) __sync_fetch_and_add ((atomic), 1);                               \
 300   }))
 301 #define g_atomic_int_dec_and_test(atomic) \
 302   (G_GNUC_EXTENSION ({                                                       \
 303     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 304     (void) (0 ? *(atomic) ^ *(atomic) : 1);                                  \
 305     __sync_fetch_and_sub ((atomic), 1) == 1;                                 \
 306   }))
 307 #define g_atomic_int_compare_and_exchange(atomic, oldval, newval) \
 308   (G_GNUC_EXTENSION ({                                                       \
 309     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 310     (void) (0 ? *(atomic) ^ (newval) ^ (oldval) : 1);                        \
 311     __sync_bool_compare_and_swap ((atomic), (oldval), (newval)) ? TRUE : FALSE; \
 312   }))
 313 #define g_atomic_int_add(atomic, val) \
 314   (G_GNUC_EXTENSION ({                                                       \
 315     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 316     (void) (0 ? *(atomic) ^ (val) : 1);                                      \
 317     (gint) __sync_fetch_and_add ((atomic), (val));                           \
 318   }))
 319 #define g_atomic_int_and(atomic, val) \
 320   (G_GNUC_EXTENSION ({                                                       \
 321     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 322     (void) (0 ? *(atomic) ^ (val) : 1);                                      \
 323     (guint) __sync_fetch_and_and ((atomic), (val));                          \
 324   }))
 325 #define g_atomic_int_or(atomic, val) \
 326   (G_GNUC_EXTENSION ({                                                       \
 327     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 328     (void) (0 ? *(atomic) ^ (val) : 1);                                      \
 329     (guint) __sync_fetch_and_or ((atomic), (val));                           \
 330   }))
 331 #define g_atomic_int_xor(atomic, val) \
 332   (G_GNUC_EXTENSION ({                                                       \
 333     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
 334     (void) (0 ? *(atomic) ^ (val) : 1);                                      \
 335     (guint) __sync_fetch_and_xor ((atomic), (val));                          \
 336   }))
 337
 338 #define g_atomic_pointer_compare_and_exchange(atomic, oldval, newval) \
 339   (G_GNUC_EXTENSION ({                                                       \
 340     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 341     (void) (0 ? (gpointer) *(atomic) : NULL);                                \
 342     __sync_bool_compare_and_swap ((atomic), (oldval), (newval)) ? TRUE : FALSE; \
 343   }))
 344 #define g_atomic_pointer_add(atomic, val) \
 345   (G_GNUC_EXTENSION ({                                                       \
 346     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 347     (void) (0 ? (gpointer) *(atomic) : NULL);                                \
 348     (void) (0 ? (val) ^ (val) : 1);                                          \
 349     (gssize) __sync_fetch_and_add ((atomic), (val));                         \
 350   }))
 351 #define g_atomic_pointer_and(atomic, val) \
 352   (G_GNUC_EXTENSION ({                                                       \
 353     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 354     (void) (0 ? (gpointer) *(atomic) : NULL);                                \
 355     (void) (0 ? (val) ^ (val) : 1);                                          \
 356     (gsize) __sync_fetch_and_and ((atomic), (val));                          \
 357   }))
 358 #define g_atomic_pointer_or(atomic, val) \
 359   (G_GNUC_EXTENSION ({                                                       \
 360     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 361     (void) (0 ? (gpointer) *(atomic) : NULL);                                \
 362     (void) (0 ? (val) ^ (val) : 1);                                          \
 363     (gsize) __sync_fetch_and_or ((atomic), (val));                           \
 364   }))
 365 #define g_atomic_pointer_xor(atomic, val) \
 366   (G_GNUC_EXTENSION ({                                                       \
 367     G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
 368     (void) (0 ? (gpointer) *(atomic) : NULL);                                \
 369     (void) (0 ? (val) ^ (val) : 1);                                          \
 370     (gsize) __sync_fetch_and_xor ((atomic), (val));                          \
 371   }))
 372
 373 #endif /* !defined(__ATOMIC_SEQ_CST) */
 374
 375 #else /* defined(G_ATOMIC_LOCK_FREE) && defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4) */
 376
 377 #define g_atomic_int_get(atomic) \
 378   (g_atomic_int_get ((gint *) (atomic)))
 379 #define g_atomic_int_set(atomic, newval) \
 380   (g_atomic_int_set ((gint *) (atomic), (gint) (newval)))
 381 #define g_atomic_int_compare_and_exchange(atomic, oldval, newval) \
 382   (g_atomic_int_compare_and_exchange ((gint *) (atomic), (oldval), (newval)))
 383 #define g_atomic_int_add(atomic, val) \
 384   (g_atomic_int_add ((gint *) (atomic), (val)))
 385 #define g_atomic_int_and(atomic, val) \
 386   (g_atomic_int_and ((guint *) (atomic), (val)))
 387 #define g_atomic_int_or(atomic, val) \
 388   (g_atomic_int_or ((guint *) (atomic), (val)))
 389 #define g_atomic_int_xor(atomic, val) \
 390   (g_atomic_int_xor ((guint *) (atomic), (val)))
 391 #define g_atomic_int_inc(atomic) \
 392   (g_atomic_int_inc ((gint *) (atomic)))
 393 #define g_atomic_int_dec_and_test(atomic) \
 394   (g_atomic_int_dec_and_test ((gint *) (atomic)))
 395
 396 #define g_atomic_pointer_get(atomic) \
 397   (g_atomic_pointer_get (atomic))
 398 #define g_atomic_pointer_set(atomic, newval) \
 399   (g_atomic_pointer_set ((atomic), (gpointer) (newval)))
 400 #define g_atomic_pointer_compare_and_exchange(atomic, oldval, newval) \
 401   (g_atomic_pointer_compare_and_exchange ((atomic), (gpointer) (oldval), (gpointer) (newval)))
 402 #define g_atomic_pointer_add(atomic, val) \
 403   (g_atomic_pointer_add ((atomic), (gssize) (val)))
 404 #define g_atomic_pointer_and(atomic, val) \
 405   (g_atomic_pointer_and ((atomic), (gsize) (val)))
 406 #define g_atomic_pointer_or(atomic, val) \
 407   (g_atomic_pointer_or ((atomic), (gsize) (val)))
 408 #define g_atomic_pointer_xor(atomic, val) \
 409   (g_atomic_pointer_xor ((atomic), (gsize) (val)))
 410
 411 #endif /* defined(__GNUC__) && defined(G_ATOMIC_OP_USE_GCC_BUILTINS) */
 412
 413 #endif /* __G_ATOMIC_H__ */