Here are the data structures with brief descriptions:

rt_device
rt_device_blk_geometry
rt_device_graphic_info
rt_device_graphic_ops
rt_device_rect_info
rt_ipc_object
rt_mailbox
rt_mempool
rt_messagequeue
rt_module
rt_mutex
rt_object
rt_object_information
rt_semaphore
rt_thread
rt_timer