/*****************************************************************************

Copyright (c) 2006, 2011, 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->LRU_list_mutex and must not hold buf_pool->zip_mutex or any
block->mutex.  The buf_pool->LRU_list_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->LRU_list_mutex
					was temporarily released */
	__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 */
	__attribute__((nonnull));

#ifndef UNIV_NONINL
# include "buf0buddy.ic"
#endif

#endif /* buf0buddy_h */
