+#ifdef __DARWIN8__
+#define atomic_add(v, a) OSAddAtomic(v, (SInt32 *)&((a)->counter))
+#define atomic_sub(v, a) OSAddAtomic(-(v), (SInt32 *)&((a)->counter))
+#define atomic_inc(a) OSIncrementAtomic((SInt32 *)&((a)->counter))
+#define atomic_dec(a) OSDecrementAtomic((SInt32 *)&((a)->counter))
+#else /* !__DARWIN8__ */