diff options
Diffstat (limited to 'include/atomic.h')
| -rw-r--r-- | include/atomic.h | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/include/atomic.h b/include/atomic.h index c8b46649c5..d14cbc5ca8 100644 --- a/include/atomic.h +++ b/include/atomic.h @@ -550,6 +550,20 @@ void __atomic_link_error (void); if (sizeof (*mem) != 4) \ __atomic_link_error (); # endif +/* We additionally provide 8b and 16b atomic loads and stores; we do not yet + need other atomic operations of such sizes, and restricting the support to + loads and stores makes this easier for archs that do not have native + support for atomic operations to less-than-word-sized data. */ +# if __HAVE_64B_ATOMICS == 1 +# define __atomic_check_size_ls(mem) \ + if ((sizeof (*mem) != 1) && (sizeof (*mem) != 2) && (sizeof (*mem) != 4) \ + && (sizeof (*mem) != 8)) \ + __atomic_link_error (); +# else +# define __atomic_check_size_ls(mem) \ + if ((sizeof (*mem) != 1) && (sizeof (*mem) != 2) && sizeof (*mem) != 4) \ + __atomic_link_error (); +# endif # define atomic_thread_fence_acquire() \ __atomic_thread_fence (__ATOMIC_ACQUIRE) @@ -559,18 +573,20 @@ void __atomic_link_error (void); __atomic_thread_fence (__ATOMIC_SEQ_CST) # define atomic_load_relaxed(mem) \ - ({ __atomic_check_size((mem)); __atomic_load_n ((mem), __ATOMIC_RELAXED); }) + ({ __atomic_check_size_ls((mem)); \ + __atomic_load_n ((mem), __ATOMIC_RELAXED); }) # define atomic_load_acquire(mem) \ - ({ __atomic_check_size((mem)); __atomic_load_n ((mem), __ATOMIC_ACQUIRE); }) + ({ __atomic_check_size_ls((mem)); \ + __atomic_load_n ((mem), __ATOMIC_ACQUIRE); }) # define atomic_store_relaxed(mem, val) \ do { \ - __atomic_check_size((mem)); \ + __atomic_check_size_ls((mem)); \ __atomic_store_n ((mem), (val), __ATOMIC_RELAXED); \ } while (0) # define atomic_store_release(mem, val) \ do { \ - __atomic_check_size((mem)); \ + __atomic_check_size_ls((mem)); \ __atomic_store_n ((mem), (val), __ATOMIC_RELEASE); \ } while (0) |