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52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
/******************************************************
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The database buffer pool global types for the directory
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(c) 1995 Innobase Oy
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Created 11/17/1995 Heikki Tuuri
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*******************************************************/
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#ifndef buf0types_h
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#define buf0types_h
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typedef struct buf_page_struct buf_page_t;
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typedef struct buf_block_struct buf_block_t;
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typedef struct buf_chunk_struct buf_chunk_t;
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typedef struct buf_pool_struct buf_pool_t;
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/* The 'type' used of a buffer frame */
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typedef byte buf_frame_t;
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/* Flags for flush types */
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enum buf_flush {
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BUF_FLUSH_LRU = 0,
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BUF_FLUSH_SINGLE_PAGE,
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BUF_FLUSH_LIST,
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BUF_FLUSH_N_TYPES /* index of last element + 1 */
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};
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/* Flags for io_fix types */
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enum buf_io_fix {
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BUF_IO_NONE = 0, /**< no pending I/O */
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BUF_IO_READ, /**< read pending */
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BUF_IO_WRITE /**< write pending */
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};
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/* Parameters of binary buddy system for compressed pages (buf0buddy.h) */
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#if UNIV_WORD_SIZE <= 4 /* 32-bit system */
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# define BUF_BUDDY_LOW 64 /* minimum block size in the binary
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buddy system; must be at least
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sizeof(buf_page_t) */
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# define BUF_BUDDY_SIZES 8 /* number of buddy sizes */
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#else /* 64-bit system */
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# define BUF_BUDDY_LOW 128 /* sizeof(buf_page_t) > 64 */
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# define BUF_BUDDY_SIZES 7
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#endif
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/* twice the maximum block size of the buddy system;
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the underlying memory is aligned by this amount:
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this must be equal to UNIV_PAGE_SIZE */
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#define BUF_BUDDY_HIGH (BUF_BUDDY_LOW << BUF_BUDDY_SIZES)
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#endif
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