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

#include <bdbuf.h>

Collaboration diagram for rtems_bdbuf_buffer:

[legend]

Data Structures
struct	rtems_bdbuf_avl_node

Data Fields
rtems_chain_node	link
	Link the BD onto a number of lists. More...

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. More...

uint32_t	waiters
	The number of threads waiting on this buffer. More...

rtems_bdbuf_group *	group
	Pointer to the group of BDs this BD is part of. More...

uint32_t	hold_timer
	Timer to indicate how long a buffer has been held in the cache modified. More...

int	references
	Allow reference counting by owner. More...

void *	user
	User data. More...

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.

Field Documentation

◆ group

rtems_bdbuf_group* rtems_bdbuf_buffer::group

Pointer to the group of BDs this BD is part of.

◆ hold_timer

uint32_t rtems_bdbuf_buffer::hold_timer

Timer to indicate how long a buffer has been held in the cache modified.

◆ link

rtems_chain_node rtems_bdbuf_buffer::link

Link the BD onto a number of lists.

◆ references

int rtems_bdbuf_buffer::references

Allow reference counting by owner.

◆ state

rtems_bdbuf_buf_state rtems_bdbuf_buffer::state

State of the buffer.

◆ user

void* rtems_bdbuf_buffer::user

User data.

◆ waiters

uint32_t rtems_bdbuf_buffer::waiters

The number of threads waiting on this buffer.

The documentation for this struct was generated from the following file:

/mnt/data0/chrisj/rtems/releases/rtems-release.git/4.11.3/ws-rtems/rtems-4.11.3/cpukit/libblock/include/rtems/bdbuf.h

Data Structures

Data Fields