111 lines
3.9 KiB
Plaintext
111 lines
3.9 KiB
Plaintext
/*****************************************************************************
|
|
|
|
Copyright (c) 2006, 2018, 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, version 2.0, as published by the
|
|
Free Software Foundation.
|
|
|
|
This program is also distributed with certain software (including but not
|
|
limited to OpenSSL) that is licensed under separate terms, as designated in a
|
|
particular file or component or in included license documentation. The authors
|
|
of MySQL hereby grant you an additional permission to link the program and
|
|
your derivative works with the separately licensed software that they have
|
|
included with MySQL.
|
|
|
|
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, version 2.0,
|
|
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 St, Fifth Floor, Boston, MA 02110-1301 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 "buf0buddy.h"
|
|
#include "buf0buf.h"
|
|
|
|
/** Allocate a block.
|
|
@param[in,out] buf_pool buffer pool instance
|
|
@param[in] i index of buf_pool->zip_free[]
|
|
or BUF_BUDDY_SIZES
|
|
@return allocated block, never NULL */
|
|
void *buf_buddy_alloc_low(buf_pool_t *buf_pool, ulint i) MY_ATTRIBUTE((malloc));
|
|
|
|
/** Deallocate a block.
|
|
@param[in] buf_pool buffer pool instance
|
|
@param[in] buf block to be freed, must not be pointed to
|
|
by the buffer pool
|
|
@param[in] i index of buf_pool->zip_free[],
|
|
or BUF_BUDDY_SIZES
|
|
@param[in] has_zip_free whether has zip_free_mutex */
|
|
void buf_buddy_free_low(buf_pool_t *buf_pool, void *buf, ulint i,
|
|
bool has_zip_free);
|
|
|
|
/** 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;
|
|
|
|
ut_ad(size >= UNIV_ZIP_SIZE_MIN);
|
|
|
|
for (i = 0, s = BUF_BUDDY_LOW; s < size; i++, s <<= 1) {
|
|
}
|
|
|
|
ut_ad(i <= BUF_BUDDY_SIZES);
|
|
return (i);
|
|
}
|
|
|
|
/** Allocate a block. This function should only be used for allocating
|
|
compressed page frames. The thread calling this function must hold
|
|
buf_pool->LRU_list_mutex and must not hold buf_pool->zip_mutex or any
|
|
block->mutex.
|
|
@param[in,out] buf_pool buffer pool in which the page resides
|
|
@param[in] size compressed page size, between
|
|
UNIV_ZIP_SIZE_MIN and UNIV_PAGE_SIZE
|
|
@return allocated block, never NULL */
|
|
UNIV_INLINE
|
|
byte *buf_buddy_alloc(buf_pool_t *buf_pool, ulint size) {
|
|
ut_ad(ut_is_2pow(size));
|
|
ut_ad(size >= UNIV_ZIP_SIZE_MIN);
|
|
ut_ad(size <= UNIV_PAGE_SIZE);
|
|
|
|
return (static_cast<byte *>(
|
|
buf_buddy_alloc_low(buf_pool, buf_buddy_get_slot(size))));
|
|
}
|
|
|
|
/** Deallocate a block.
|
|
@param[in,out] buf_pool buffer pool in which the block resides
|
|
@param[in] buf block to be freed, must not be pointed to
|
|
by the buffer pool
|
|
@param[in] size block size, up to UNIV_PAGE_SIZE */
|
|
UNIV_INLINE
|
|
void buf_buddy_free(buf_pool_t *buf_pool, void *buf, ulint size) {
|
|
ut_ad(ut_is_2pow(size));
|
|
ut_ad(size >= UNIV_ZIP_SIZE_MIN);
|
|
ut_ad(size <= UNIV_PAGE_SIZE);
|
|
|
|
buf_buddy_free_low(buf_pool, buf, buf_buddy_get_slot(size), false);
|
|
}
|
|
|
|
#ifdef UNIV_MATERIALIZE
|
|
#undef UNIV_INLINE
|
|
#define UNIV_INLINE UNIV_INLINE_ORIGINAL
|
|
#endif
|