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/*****************************************************************************
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
*****************************************************************************/
/**************************************************//**
@file include/buf0types.h
The database buffer pool global types for the directory
Created 11/17/1995 Heikki Tuuri
*******************************************************/
#ifndef buf0types_h
#define buf0types_h
/** Buffer page (uncompressed or compressed) */
typedef struct buf_page_struct buf_page_t;
/** Buffer block for which an uncompressed page exists */
typedef struct buf_block_struct buf_block_t;
/** Buffer pool chunk comprising buf_block_t */
typedef struct buf_chunk_struct buf_chunk_t;
/** Buffer pool comprising buf_chunk_t */
typedef struct buf_pool_struct buf_pool_t;
/** Buffer pool statistics struct */
typedef struct buf_pool_stat_struct buf_pool_stat_t;
/** A buffer frame. @see page_t */
typedef byte buf_frame_t;
/** Flags for flush types */
enum buf_flush {
BUF_FLUSH_LRU = 0, /*!< flush via the LRU list */
BUF_FLUSH_SINGLE_PAGE, /*!< flush a single page */
BUF_FLUSH_LIST, /*!< flush via the flush list
of dirty blocks */
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 */
/** Base-2 logarithm of the smallest buddy block size */
# define BUF_BUDDY_LOW_SHIFT 6
#else /* 64-bit system */
/** Base-2 logarithm of the smallest buddy block size */
# 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
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