+uint32_t throttle_lowpri_io(int sleep_amount);
+void throttle_set_thread_io_policy(int policy);
+typedef struct __throttle_info_handle *throttle_info_handle_t;
+int throttle_info_ref_by_mask(
+ uint64_t throttle_mask, throttle_info_handle_t *throttle_info_handle);
+void throttle_info_rel_by_mask(throttle_info_handle_t throttle_info_handle);
+void throttle_info_update_by_mask(void *throttle_info_handle, int flags);