buf_dblwr_t Struct Reference

#include <buf0dblwr.h>

Collaboration diagram for buf_dblwr_t:

Public Attributes
ib_mutex_t	mutex
ulint	block1
ulint	block2
ulint	first_free
ulint	b_reserved
os_event_t	b_event
ulint	s_reserved
os_event_t	s_event
bool *	in_use
bool	batch_running
byte *	write_buf
byte *	write_buf_unaligned
buf_page_t **	buf_block_arr

Detailed Description

Doublewrite control struct

Definition at line 117 of file buf0dblwr.h.

Member Data Documentation

os_event_t buf_dblwr_t::b_event

event where threads wait for a batch flush to end.

Definition at line 127 of file buf0dblwr.h.

ulint buf_dblwr_t::b_reserved

number of slots currently reserved for batch flush.

Definition at line 125 of file buf0dblwr.h.

bool buf_dblwr_t::batch_running

set to TRUE if currently a batch is being written from the doublewrite buffer.

Definition at line 136 of file buf0dblwr.h.

ulint buf_dblwr_t::block1

the page number of the first doublewrite block (64 pages)

Definition at line 120 of file buf0dblwr.h.

ulint buf_dblwr_t::block2

page number of the second block

Definition at line 122 of file buf0dblwr.h.

buf_page_t** buf_dblwr_t::buf_block_arr

array to store pointers to the buffer blocks which have been cached to write_buf

Definition at line 145 of file buf0dblwr.h.

ulint buf_dblwr_t::first_free

first free position in write_buf measured in units of UNIV_PAGE_SIZE

Definition at line 123 of file buf0dblwr.h.

bool* buf_dblwr_t::in_use

flag used to indicate if a slot is in use. Only used for single page flushes.

Definition at line 133 of file buf0dblwr.h.

ib_mutex_t buf_dblwr_t::mutex

mutex protecting the first_free field and write_buf

Definition at line 118 of file buf0dblwr.h.

os_event_t buf_dblwr_t::s_event

event where threads wait for a single page flush slot.

Definition at line 131 of file buf0dblwr.h.

ulint buf_dblwr_t::s_reserved

number of slots currently reserved for single page flushes.

Definition at line 129 of file buf0dblwr.h.

byte* buf_dblwr_t::write_buf

write buffer used in writing to the doublewrite buffer, aligned to an address divisible by UNIV_PAGE_SIZE (which is required by Windows aio)

Definition at line 139 of file buf0dblwr.h.

byte* buf_dblwr_t::write_buf_unaligned

pointer to write_buf, but unaligned

Definition at line 143 of file buf0dblwr.h.

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

• storage/innobase/include/buf0dblwr.h