rtems_bdbuf_buffer Struct Reference

#include <bdbuf.h>

Data Structures
struct	rtems_bdbuf_avl_node

Data Fields
rtems_chain_node	link
struct rtems_bdbuf_buffer::rtems_bdbuf_avl_node	avl
rtems_disk_device *	dd
rtems_blkdev_bnum	block
unsigned char *	buffer
rtems_bdbuf_buf_state	state
uint32_t	waiters
rtems_bdbuf_group *	group
uint32_t	hold_timer
int	references
void *	user

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

block

rtems_blkdev_bnum rtems_bdbuf_buffer::block

block number on the device

buffer

unsigned char* rtems_bdbuf_buffer::buffer

Pointer to the buffer memory area

dd

rtems_disk_device* rtems_bdbuf_buffer::dd

disk device

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.

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

• cpukit/include/rtems/bdbuf.h