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cd353a2bb9
just one parameter: UNIV_PAGE_SIZE_SHIFT. UNIV_PAGE_SIZE, BUF_BUDDY_SIZES: Define in terms of UNIV_PAGE_SIZE_SHIFT. BUF_BUDDY_LOW_SHIFT: New macro, to simplify the definition of BUF_BUDDY_LOW and BUF_BUDDY_SIZES. PAGE_ZIP_DIR_SLOT_MASK: Relax the compile-time check. This bitmask must be one less than a power of two, and at least UNIV_PAGE_SIZE - 1.
54 lines
1.5 KiB
C
54 lines
1.5 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_SHIFT 6
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#else /* 64-bit system */
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# define BUF_BUDDY_LOW_SHIFT 7
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#endif
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#define BUF_BUDDY_LOW (1 << BUF_BUDDY_LOW_SHIFT)
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/* 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 (UNIV_PAGE_SIZE_SHIFT - BUF_BUDDY_LOW_SHIFT)
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/* number of buddy sizes */
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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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