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/*****************************************************************************
Copyright (c) 2006, 2009, Innobase Oy. 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., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************/
/**************************************************//**
@file include/buf0buddy.ic
Binary buddy allocator for compressed pages
Created December 2006 by Marko Makela
*******************************************************/
#ifdef UNIV_MATERIALIZE
# undef UNIV_INLINE
# define UNIV_INLINE
#endif
#include "buf0buf.h"
#include "buf0buddy.h"
#include "ut0ut.h"
#include "sync0sync.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 only be released and reacquired if lru != NULL.
@return allocated block, possibly NULL if lru==NULL */
UNIV_INTERN
void*
buf_buddy_alloc_low(
/*================*/
buf_pool_t* buf_pool,
/*!< in: buffer pool in which the page resides */
ulint i, /*!< in: index of buf_pool->zip_free[],
or BUF_BUDDY_SIZES */
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,
or NULL if the LRU list should not be used */
__attribute__((malloc));
/**********************************************************************//**
Deallocate a block. */
UNIV_INTERN
void
buf_buddy_free_low(
/*===============*/
buf_pool_t* buf_pool, /*!< in: buffer pool instance */
void* buf, /*!< in: block to be freed, must not be
pointed to by the buffer pool */
ulint i) /*!< in: index of buf_pool->zip_free[],
or BUF_BUDDY_SIZES */
__attribute__((nonnull));
/**********************************************************************//**
Get the index of buf_pool->zip_free[] for a given block size.
@return index of buf_pool->zip_free[], or BUF_BUDDY_SIZES */
UNIV_INLINE
ulint
buf_buddy_get_slot(
/*===============*/
ulint size) /*!< in: block size */
{
ulint i;
ulint s;
for (i = 0, s = BUF_BUDDY_LOW; s < size; i++, s <<= 1) {
}
ut_ad(i <= BUF_BUDDY_SIZES);
return(i);
}
/**********************************************************************//**
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 only be released and reacquired
if lru != NULL. This function should only be used for allocating
compressed page frames or control blocks (buf_page_t). Allocated
control blocks must be properly initialized immediately after
buf_buddy_alloc() has returned the memory, before releasing
buf_pool->mutex.
@return allocated block, possibly NULL if lru == NULL */
UNIV_INLINE
void*
buf_buddy_alloc(
/*============*/
buf_pool_t* buf_pool, /*!< in: buffer pool in which
the page resides */
ulint size, /*!< in: block size, up to
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, or NULL if
the LRU list should not be used */
{
ut_ad(buf_pool_mutex_own(buf_pool));
return(buf_buddy_alloc_low(buf_pool, buf_buddy_get_slot(size), lru));
}
/**********************************************************************//**
Deallocate a block. */
UNIV_INLINE
void
buf_buddy_free(
/*===========*/
buf_pool_t* buf_pool, /*!< in: buffer pool instance */
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 */
{
ut_ad(buf_pool_mutex_own(buf_pool));
buf_buddy_free_low(buf_pool, buf, buf_buddy_get_slot(size));
}
#ifdef UNIV_MATERIALIZE
# undef UNIV_INLINE
# define UNIV_INLINE UNIV_INLINE_ORIGINAL
#endif
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