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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.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 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,
/*!< buffer pool in which the block 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 */
ibool have_page_hash_mutex)
__attribute__((malloc));
/**********************************************************************//**
Release a block. */
UNIV_INLINE
void
buf_buddy_free(
/*===========*/
buf_pool_t* buf_pool,
/*!< 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 */
ibool have_page_hash_mutex)
__attribute__((nonnull));
#ifndef UNIV_NONINL
# include "buf0buddy.ic"
#endif
#endif /* buf0buddy_h */
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