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Diffstat (limited to 'storage/innodb_plugin/include/buf0buddy.ic')
| -rw-r--r-- | storage/innodb_plugin/include/buf0buddy.ic | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/storage/innodb_plugin/include/buf0buddy.ic b/storage/innodb_plugin/include/buf0buddy.ic new file mode 100644 index 00000000000..c419a2374d9 --- /dev/null +++ b/storage/innodb_plugin/include/buf0buddy.ic @@ -0,0 +1,127 @@ +/***************************************************************************** + +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.ic +Binary buddy allocator for compressed pages + +Created December 2006 by Marko Makela +*******************************************************/ + +#ifdef UNIV_MATERIALIZE +# undef UNIV_INLINE +# define UNIV_INLINE +#endif + +#include "buf0buf.h" +#include "buf0buddy.h" +#include "ut0ut.h" +#include "sync0sync.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. +@return allocated block, possibly NULL if lru==NULL */ +UNIV_INTERN +void* +buf_buddy_alloc_low( +/*================*/ + ulint i, /*!< in: index of buf_pool->zip_free[], + or BUF_BUDDY_SIZES */ + 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 */ + __attribute__((malloc)); + +/**********************************************************************//** +Deallocate a block. */ +UNIV_INTERN +void +buf_buddy_free_low( +/*===============*/ + void* buf, /*!< in: block to be freed, must not be + pointed to by the buffer pool */ + ulint i) /*!< in: index of buf_pool->zip_free[], + or BUF_BUDDY_SIZES */ + __attribute__((nonnull)); + +/**********************************************************************//** +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; + + for (i = 0, s = BUF_BUDDY_LOW; s < size; i++, s <<= 1) { + } + + ut_ad(i <= BUF_BUDDY_SIZES); + return(i); +} + +/**********************************************************************//** +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( +/*============*/ + 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 */ +{ + ut_ad(buf_pool_mutex_own()); + + return(buf_buddy_alloc_low(buf_buddy_get_slot(size), lru)); +} + +/**********************************************************************//** +Deallocate a block. */ +UNIV_INLINE +void +buf_buddy_free( +/*===========*/ + 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 */ +{ + ut_ad(buf_pool_mutex_own()); + + buf_buddy_free_low(buf, buf_buddy_get_slot(size)); +} + +#ifdef UNIV_MATERIALIZE +# undef UNIV_INLINE +# define UNIV_INLINE UNIV_INLINE_ORIGINAL +#endif |