79 lines
3.0 KiB
C
79 lines
3.0 KiB
C
/*****************************************************************************
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Copyright (c) 2006, 2018, Oracle and/or its affiliates. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License, version 2.0, as published by the
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Free Software Foundation.
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This program is also distributed with certain software (including but not
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limited to OpenSSL) that is licensed under separate terms, as designated in a
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particular file or component or in included license documentation. The authors
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of MySQL hereby grant you an additional permission to link the program and
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your derivative works with the separately licensed software that they have
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included with MySQL.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
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for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*****************************************************************************/
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/** @file include/buf0buddy.h
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Binary buddy allocator for compressed pages
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Created December 2006 by Marko Makela
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*******************************************************/
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#ifndef buf0buddy_h
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#define buf0buddy_h
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#ifdef UNIV_MATERIALIZE
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#undef UNIV_INLINE
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#define UNIV_INLINE
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#endif
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#include "buf0types.h"
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#include "univ.i"
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/** Allocate a block. This function should only be used for allocating
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compressed page frames. The thread calling this function must hold
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buf_pool->LRU_list_mutex and must not hold buf_pool->zip_mutex or any
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block->mutex.
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@param[in,out] buf_pool buffer pool in which the page resides
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@param[in] size compressed page size, between
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UNIV_ZIP_SIZE_MIN and UNIV_PAGE_SIZE
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@return allocated block, never NULL */
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UNIV_INLINE
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byte *buf_buddy_alloc(buf_pool_t *buf_pool, ulint size) MY_ATTRIBUTE((malloc));
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/** Deallocate a block.
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@param[in,out] buf_pool buffer pool in which the block resides
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@param[in] buf block to be freed, must not be pointed to
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by the buffer pool
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@param[in] size block size, up to UNIV_PAGE_SIZE */
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UNIV_INLINE
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void buf_buddy_free(buf_pool_t *buf_pool, void *buf, ulint size);
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/** Try to reallocate a block.
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@param[in] buf_pool buffer pool instance
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@param[in] buf block to be reallocated, must be pointed
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to by the buffer pool
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@param[in] size block size, up to UNIV_PAGE_SIZE
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@retval true if succeeded or if failed because the block was fixed
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@retval false if failed because of no free blocks. */
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bool buf_buddy_realloc(buf_pool_t *buf_pool, void *buf, ulint size);
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/** Combine all pairs of free buddies.
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@param[in] buf_pool buffer pool instance */
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void buf_buddy_condense_free(buf_pool_t *buf_pool);
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#include "buf0buddy.ic"
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#endif /* buf0buddy_h */
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