# define atomic_set(x, val) ((x)->atomic = (uint_t)(val))
# define atomic_inc(x) (atomic_inc_uint (&(x)->atomic))
# define atomic_dec_and_test(x) (atomic_dec_uint_nv(&(x)->atomic) == 1)
-# define atomic_add(x, v) (atomic_add_uint(&(x)->atomic, (v)))
-# define atomic_dec(x, v) (atomic_dec_uint(&(x)->atomic, (v)))
+# define atomic_add(x, v) (atomic_add_int(&(x)->atomic, (v)))
+# define atomic_dec(x, v) (atomic_add_int(&(x)->atomic, -(v)))
# define atomic_cmpxchg(x, oldv, newv) atomic_cas_uint (&(x)->atomic, oldv, newv)
#endif
#error libdrm requires atomic operations, please define them for your CPU/compiler.
#endif
+static inline int atomic_add_unless(atomic_t *v, int add, int unless)
+{
+ int c, old;
+ c = atomic_read(v);
+ while (c != unless && (old = atomic_cmpxchg(v, c, c + add)) != c)
+ c = old;
+ return c == unless;
+}
+
#endif