HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data);
#define HB_SHAPER_DATA_ENSURE_DEFINE(shaper, object) \
+ HB_SHAPER_DATA_ENSURE_DEFINE_WITH_CONDITION(shaper, object, true)
+
+#define HB_SHAPER_DATA_ENSURE_DEFINE_WITH_CONDITION(shaper, object, condition) \
bool \
HB_SHAPER_DATA_ENSURE_FUNC(shaper, object) (hb_##object##_t *object) \
{\
retry: \
HB_SHAPER_DATA_TYPE (shaper, object) *data = (HB_SHAPER_DATA_TYPE (shaper, object) *) hb_atomic_ptr_get (&HB_SHAPER_DATA (shaper, object)); \
+ if (likely (data) && !(condition)) { \
+ /* Drop and recreate. */ \
+ /* If someone dropped it in the mean time, throw it away and don't touch it. \
+ * Otherwise, destruct it. */ \
+ if (hb_atomic_ptr_cmpexch (&HB_SHAPER_DATA (shaper, object), data, NULL)) { \
+ HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data); \
+ } \
+ goto retry; \
+ } \
if (unlikely (!data)) { \
data = HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (object); \
if (unlikely (!data)) \