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/*****************************************************************************
Copyright (c) 2006, 2016, Oracle and/or its affiliates. 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.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/buf0buddy.h
Binary buddy allocator for compressed pages
Created December 2006 by Marko Makela
*******************************************************/
#ifndef buf0buddy_h
#define buf0buddy_h
#ifdef UNIV_MATERIALIZE
# undef UNIV_INLINE
# define UNIV_INLINE
#endif
#include "univ.i"
#include "buf0types.h"
/**********************************************************************//**
Allocate a block. The thread calling this function must hold
buf_pool->mutex and must not hold buf_pool->zip_mutex or any
block->mutex. The buf_pool->mutex may be released and reacquired.
This function should only be used for allocating compressed page frames.
@return allocated block, never NULL */
UNIV_INLINE
byte*
buf_buddy_alloc(
/*============*/
buf_pool_t* buf_pool, /*!< in/out: buffer pool in which
the page resides */
ulint size, /*!< in: compressed page size
(between UNIV_ZIP_SIZE_MIN and
UNIV_PAGE_SIZE) */
ibool* lru) /*!< in: pointer to a variable
that will be assigned TRUE if
storage was allocated from the
LRU list and buf_pool->mutex was
temporarily released */
MY_ATTRIBUTE((malloc, nonnull));
/**********************************************************************//**
Deallocate a block. */
UNIV_INLINE
void
buf_buddy_free(
/*===========*/
buf_pool_t* buf_pool, /*!< in/out: buffer pool in which
the block resides */
void* buf, /*!< in: block to be freed, must not
be pointed to by the buffer pool */
ulint size) /*!< in: block size,
up to UNIV_PAGE_SIZE */
MY_ATTRIBUTE((nonnull));
/** Reallocate a block.
@param[in] buf_pool buffer pool instance
@param[in] buf block to be reallocated, must be pointed
to by the buffer pool
@param[in] size block size, up to UNIV_PAGE_SIZE
@retval false if failed because of no free blocks. */
bool
buf_buddy_realloc(
buf_pool_t* buf_pool,
void* buf,
ulint size);
/** Combine all pairs of free buddies.
@param[in] buf_pool buffer pool instance */
void
buf_buddy_condense_free(
buf_pool_t* buf_pool);
#include "buf0buddy.ic"
#endif /* buf0buddy_h */
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