1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/*****************************************************************************
Copyright (c) 1995, 2009, Innobase Oy. All Rights Reserved.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************/
/******************************************************
The database buffer pool global types for the directory
Created 11/17/1995 Heikki Tuuri
*******************************************************/
#ifndef buf0types_h
#define buf0types_h
typedef struct buf_page_struct buf_page_t;
typedef struct buf_block_struct buf_block_t;
typedef struct buf_chunk_struct buf_chunk_t;
typedef struct buf_pool_struct buf_pool_t;
/* The 'type' used of a buffer frame */
typedef byte buf_frame_t;
/* Flags for flush types */
enum buf_flush {
BUF_FLUSH_LRU = 0,
BUF_FLUSH_SINGLE_PAGE,
BUF_FLUSH_LIST,
BUF_FLUSH_N_TYPES /* index of last element + 1 */
};
/* Flags for io_fix types */
enum buf_io_fix {
BUF_IO_NONE = 0, /**< no pending I/O */
BUF_IO_READ, /**< read pending */
BUF_IO_WRITE /**< write pending */
};
/* Parameters of binary buddy system for compressed pages (buf0buddy.h) */
#if UNIV_WORD_SIZE <= 4 /* 32-bit system */
# define BUF_BUDDY_LOW_SHIFT 6
#else /* 64-bit system */
# define BUF_BUDDY_LOW_SHIFT 7
#endif
#define BUF_BUDDY_LOW (1 << BUF_BUDDY_LOW_SHIFT)
/* minimum block size in the binary
buddy system; must be at least
sizeof(buf_page_t) */
#define BUF_BUDDY_SIZES (UNIV_PAGE_SIZE_SHIFT - BUF_BUDDY_LOW_SHIFT)
/* number of buddy sizes */
/* twice the maximum block size of the buddy system;
the underlying memory is aligned by this amount:
this must be equal to UNIV_PAGE_SIZE */
#define BUF_BUDDY_HIGH (BUF_BUDDY_LOW << BUF_BUDDY_SIZES)
#endif
|
