宏定义
#define	MY_ATOMIC_MODE "atomic_builtins"
#define	make_atomic_add_body(S) v= __sync_fetch_and_add(a, v);
#define	make_atomic_swap_body(S) v= __sync_lock_test_and_set(a, v);
#define	make_atomic_cas_body(S)
#define	MY_ATOMIC_MODE "gcc-builtins-smp"
#define	make_atomic_load_body(S) ret= __sync_fetch_and_or(a, 0);
#define	make_atomic_store_body(S) (void) __sync_lock_test_and_set(a, v);

宏定义文档

#define make_atomic_add_body ( S ) v= __sync_fetch_and_add(a, v);

#define make_atomic_cas_body ( S )

值:

int ## S sav;                                     \
  sav= __sync_val_compare_and_swap(a, *cmp, set);   \
  if (!(ret= (sav == *cmp))) *cmp= sav;

#define make_atomic_load_body ( S ) ret= __sync_fetch_and_or(a, 0);

#define make_atomic_store_body ( S ) (void) __sync_lock_test_and_set(a, v);

#define make_atomic_swap_body ( S ) v= __sync_lock_test_and_set(a, v);

#define MY_ATOMIC_MODE "atomic_builtins"

#define MY_ATOMIC_MODE "gcc-builtins-smp"