The BD buffer cache. More...

Collaboration diagram for rtems_bdbuf_cache:

[legend]

Data Fields
rtems_id	swapout
	Swapout task ID.

bool	swapout_enabled
	Swapout is only running if enabled. More...

rtems_chain_control	swapout_free_workers
	The work threads for the swapout task. More...

rtems_bdbuf_buffer *	bds
	Pointer to table of buffer descriptors. More...

void *	buffers
	The buffer's memory. More...

size_t	buffer_min_count
	Number of minimum size buffers that fit the buffer memory. More...

size_t	max_bds_per_group
	The number of BDs of minimum buffer size that fit in a group. More...

uint32_t	flags
	Configuration flags. More...

rtems_bdbuf_lock_type	lock
	The cache lock. More...

rtems_bdbuf_lock_type	sync_lock
	Sync calls block writes. More...

bool	sync_active
	True if a sync is active. More...

rtems_id	sync_requester
	The sync requester. More...

rtems_disk_device *	sync_device
	The device to sync and BDBUF_INVALID_DEV not a device sync. More...

rtems_bdbuf_buffer *	tree
	Buffer descriptor lookup AVL tree root. More...

rtems_chain_control	lru
	Least recently used list.

rtems_chain_control	modified
	Modified buffers list.

rtems_chain_control	sync
	Buffers to sync list.

rtems_bdbuf_waiters	access_waiters
	Wait for a buffer in ACCESS_CACHED, ACCESS_MODIFIED or ACCESS_EMPTY state. More...

rtems_bdbuf_waiters	transfer_waiters
	Wait for a buffer in TRANSFER state. More...

rtems_bdbuf_waiters	buffer_waiters
	Wait for a buffer and no one is available. More...

rtems_bdbuf_swapout_transfer *	swapout_transfer

rtems_bdbuf_swapout_worker *	swapout_workers

size_t	group_count
	The number of groups. More...

rtems_bdbuf_group *	groups
	The groups. More...

rtems_id	read_ahead_task
	Read-ahead task.

rtems_chain_control	read_ahead_chain
	Read-ahead request chain.

bool	read_ahead_enabled
	Read-ahead enabled.

rtems_status_code	init_status
	The initialization status.

Detailed Description

The BD buffer cache.

Field Documentation

◆ access_waiters

rtems_bdbuf_waiters rtems_bdbuf_cache::access_waiters

Wait for a buffer in ACCESS_CACHED, ACCESS_MODIFIED or ACCESS_EMPTY state.

◆ bds

rtems_bdbuf_buffer* rtems_bdbuf_cache::bds

Pointer to table of buffer descriptors.

◆ buffer_min_count

size_t rtems_bdbuf_cache::buffer_min_count

Number of minimum size buffers that fit the buffer memory.

◆ buffer_waiters

rtems_bdbuf_waiters rtems_bdbuf_cache::buffer_waiters

Wait for a buffer and no one is available.

◆ buffers

void* rtems_bdbuf_cache::buffers

The buffer's memory.

◆ flags

uint32_t rtems_bdbuf_cache::flags

Configuration flags.

◆ group_count

size_t rtems_bdbuf_cache::group_count

The number of groups.

◆ groups

rtems_bdbuf_group* rtems_bdbuf_cache::groups

The groups.

◆ lock

rtems_bdbuf_lock_type rtems_bdbuf_cache::lock

The cache lock.

It locks all cache data, BD and lists.

◆ max_bds_per_group

size_t rtems_bdbuf_cache::max_bds_per_group

The number of BDs of minimum buffer size that fit in a group.

◆ swapout_enabled

bool rtems_bdbuf_cache::swapout_enabled

Swapout is only running if enabled.

Set to false to kill the swap out task. It deletes itself.

◆ swapout_free_workers

rtems_chain_control rtems_bdbuf_cache::swapout_free_workers

The work threads for the swapout task.

◆ sync_active

bool rtems_bdbuf_cache::sync_active

True if a sync is active.

◆ sync_device

rtems_disk_device* rtems_bdbuf_cache::sync_device

The device to sync and BDBUF_INVALID_DEV not a device sync.

◆ sync_lock

rtems_bdbuf_lock_type rtems_bdbuf_cache::sync_lock

Sync calls block writes.

◆ sync_requester

rtems_id rtems_bdbuf_cache::sync_requester

The sync requester.

◆ transfer_waiters

rtems_bdbuf_waiters rtems_bdbuf_cache::transfer_waiters

Wait for a buffer in TRANSFER state.

◆ tree

rtems_bdbuf_buffer* rtems_bdbuf_cache::tree

Buffer descriptor lookup AVL tree root.

There is only one.

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/src/bdbuf.c

Data Fields