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compressed pages from the buffer pool. Makefile.am: Add buf0buddy.h, buf0buddy.ic. buf/Makefile.am: Add buf0buddy.c. Introduce the constants BUF_BUDDY_LOW and BUF_BUDDY_SIZES. buf_pool_t: Add zip_mutex and the lists zip_clean and zip_free[]. buf_page_get_mutex(): Return &buf_pool->zip_mutex instead of NULL. buf_buddy_get_offset(), buf_buddy_get(), buf_buddy_get_slot(), buf_buddy_alloc_free(), buf_buddy_alloc_free_low(): New functions.
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/******************************************************
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Binary buddy allocator for compressed pages
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(c) 2006 Innobase Oy
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Created December 2006 by Marko Makela
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*******************************************************/
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#ifndef buf0buddy_h
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#define buf0buddy_h
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#ifdef UNIV_MATERIALIZE
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# undef UNIV_INLINE
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# define UNIV_INLINE
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#endif
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#include "univ.i"
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#include "buf0types.h"
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/**************************************************************************
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Get the offset of the buddy of a compressed page frame. */
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UNIV_INLINE
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lint
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buf_buddy_get_offset(
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/*=================*/
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/* out: offset of the buddy relative to page */
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const void* page, /* in: compressed page */
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ulint size) /* in: page size in bytes */
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__attribute__((nonnull));
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/**************************************************************************
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Get the buddy of a compressed page frame. */
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#define buf_buddy_get(page,size) ((page) + buf_buddy_get_offset((page),(size)))
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/**************************************************************************
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Get the index of buf_pool->zip_free[] for a given block size. */
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UNIV_INLINE
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ulint
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buf_buddy_get_slot(
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/*===============*/
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/* out: index of buf_pool->zip_free[] */
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ulint size); /* in: block size */
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/**************************************************************************
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Try to allocate a block from buf_pool->zip_free[]. */
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UNIV_INLINE
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void*
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buf_buddy_alloc_free(
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/*=================*/
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ulint size) /* in: block size, up to UNIV_PAGE_SIZE / 2 */
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__attribute__((malloc));
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#ifndef UNIV_NONINL
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# include "buf0buddy.ic"
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#endif
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#endif /* buf0buddy_h */
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