#define uv__handle_ref(h) \
do { \
if (((h)->flags & UV__HANDLE_REF) != 0) break; \
(h)->flags |= UV__HANDLE_REF; \
if (((h)->flags & UV__HANDLE_CLOSING) != 0) break; \
if (((h)->flags & UV__HANDLE_ACTIVE) != 0) uv__active_handle_add(h); \
} \
while (0)