mirror of
https://github.com/MariaDB/server.git
synced 2025-01-29 10:14:19 +01:00
91 lines
2.9 KiB
C
91 lines
2.9 KiB
C
/*****************************************************************************
|
|
|
|
Copyright (c) 2006, 2016, Oracle and/or its affiliates. All Rights Reserved.
|
|
Copyright (c) 2018, 2020, MariaDB Corporation.
|
|
|
|
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, Fifth Floor, 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
|
|
|
|
#include "buf0types.h"
|
|
|
|
/**
|
|
@param[in] block size in bytes
|
|
@return index of buf_pool.zip_free[], or BUF_BUDDY_SIZES */
|
|
inline
|
|
ulint
|
|
buf_buddy_get_slot(ulint size)
|
|
{
|
|
ulint i;
|
|
ulint s;
|
|
|
|
ut_ad(ut_is_2pow(size));
|
|
ut_ad(size >= UNIV_ZIP_SIZE_MIN);
|
|
ut_ad(size <= srv_page_size);
|
|
|
|
for (i = 0, s = BUF_BUDDY_LOW; s < size; i++, s <<= 1) {
|
|
}
|
|
ut_ad(i <= BUF_BUDDY_SIZES);
|
|
return i;
|
|
}
|
|
|
|
/** Allocate a ROW_FORMAT=COMPRESSED block.
|
|
@param i index of buf_pool.zip_free[] or BUF_BUDDY_SIZES
|
|
@param lru assigned to true if buf_pool.mutex was temporarily released
|
|
@return allocated block, never NULL */
|
|
byte *buf_buddy_alloc_low(ulint i, bool *lru) MY_ATTRIBUTE((malloc));
|
|
|
|
/** Allocate a ROW_FORMAT=COMPRESSED block.
|
|
@param size compressed page size in bytes
|
|
@param lru assigned to true if buf_pool.mutex was temporarily released
|
|
@return allocated block, never NULL */
|
|
inline byte *buf_buddy_alloc(ulint size, bool *lru= nullptr)
|
|
{
|
|
return buf_buddy_alloc_low(buf_buddy_get_slot(size), lru);
|
|
}
|
|
|
|
/** Deallocate a block.
|
|
@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 */
|
|
void buf_buddy_free_low(void* buf, ulint i);
|
|
|
|
/** Deallocate a block.
|
|
@param[in] buf block to be freed, must not be pointed to
|
|
by the buffer pool
|
|
@param[in] size block size in bytes */
|
|
inline void buf_buddy_free(void* buf, ulint size)
|
|
{
|
|
buf_buddy_free_low(buf, buf_buddy_get_slot(size));
|
|
}
|
|
|
|
/** Try to reallocate a block.
|
|
@param[in] buf block to be reallocated, must be pointed
|
|
to by the buffer pool
|
|
@param[in] size block size, up to srv_page_size
|
|
@retval false if failed because of no free blocks. */
|
|
bool buf_buddy_realloc(void* buf, ulint size);
|
|
|
|
/** Combine all pairs of free buddies. */
|
|
void buf_buddy_condense_free();
|
|
#endif /* buf0buddy_h */
|