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92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/*****************************************************************************
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Copyright (c) 2006, 2016, Oracle and/or its affiliates. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/buf0buddy.h
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Binary buddy allocator for compressed pages
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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 "buf0types.h"
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/**********************************************************************//**
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Allocate a block. The thread calling this function must hold
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buf_pool->mutex and must not hold buf_pool->zip_mutex or any
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block->mutex. The buf_pool->mutex may be released and reacquired.
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This function should only be used for allocating compressed page frames.
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@return allocated block, never NULL */
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UNIV_INLINE
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byte*
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buf_buddy_alloc(
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/*============*/
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buf_pool_t* buf_pool, /*!< in/out: buffer pool in which
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the page resides */
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ulint size, /*!< in: compressed page size
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(between UNIV_ZIP_SIZE_MIN and
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UNIV_PAGE_SIZE) */
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ibool* lru) /*!< in: pointer to a variable
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that will be assigned TRUE if
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storage was allocated from the
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LRU list and buf_pool->mutex was
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temporarily released */
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MY_ATTRIBUTE((malloc, nonnull));
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/**********************************************************************//**
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Deallocate a block. */
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UNIV_INLINE
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void
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buf_buddy_free(
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/*===========*/
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buf_pool_t* buf_pool, /*!< in/out: buffer pool in which
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the block resides */
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void* buf, /*!< in: block to be freed, must not
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be pointed to by the buffer pool */
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ulint size) /*!< in: block size,
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up to UNIV_PAGE_SIZE */
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MY_ATTRIBUTE((nonnull));
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/** Reallocate a block.
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@param[in] buf_pool buffer pool instance
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@param[in] buf block to be reallocated, must be pointed
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to by the buffer pool
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@param[in] size block size, up to UNIV_PAGE_SIZE
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@retval false if failed because of no free blocks. */
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bool
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buf_buddy_realloc(
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buf_pool_t* buf_pool,
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void* buf,
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ulint size);
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/** Combine all pairs of free buddies.
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@param[in] buf_pool buffer pool instance */
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void
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buf_buddy_condense_free(
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buf_pool_t* buf_pool);
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#include "buf0buddy.inl"
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#endif /* buf0buddy_h */
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