To manage buffers we using buffer descriptors (BD). More...

#include <bdbuf.h>

Collaboration diagram for rtems_bdbuf_buffer:

Data Structures
struct	rtems_bdbuf_avl_node
Data Fields
rtems_chain_node	link
	Link the BD onto a number of lists.
struct rtems_bdbuf_buffer::rtems_bdbuf_avl_node	avl
rtems_disk_device *	dd
	disk device
rtems_blkdev_bnum	block
	block number on the device
unsigned char *	buffer
	Pointer to the buffer memory area.
rtems_bdbuf_buf_state	state
	State of the buffer.
uint32_t	waiters
	The number of threads waiting on this buffer.
rtems_bdbuf_group *	group
	Pointer to the group of BDs this BD is part of.
uint32_t	hold_timer
	Timer to indicate how long a buffer has been held in the cache modified.
int	references
	Allow reference counting by owner.
void *	user
	User data.

Detailed Description

To manage buffers we using buffer descriptors (BD).

A BD holds a buffer plus a range of other information related to managing the buffer in the cache. To speed-up buffer lookup descriptors are organized in AVL-Tree. The fields 'dd' and 'block' are search keys.