u32 pool_index, u32 timer_id, u64 interval);
void TW (tw_timer_stop) (TWT (tw_timer_wheel) * tw, u32 handle);
+int TW (tw_timer_handle_is_free) (TWT (tw_timer_wheel) * tw, u32 handle);
void TW (tw_timer_update) (TWT (tw_timer_wheel) * tw, u32 handle,
u64 interval);