buf0buddy.h File Reference

#include "univ.i"
#include "buf0types.h"
#include "buf0buddy.ic"

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Functions
UNIV_INLINE byte *	buf_buddy_alloc (buf_pool_t *buf_pool, ulint size, ibool *lru) __attribute__((malloc
UNIV_INLINE void	buf_buddy_free (buf_pool_t *buf_pool, void *buf, ulint size) __attribute__((nonnull))

Variables
UNIV_INLINE byte	nonnull

Detailed Description

Binary buddy allocator for compressed pages

Created December 2006 by Marko Makela

Definition in file buf0buddy.h.

Function Documentation

UNIV_INLINE byte* buf_buddy_alloc	(	buf_pool_t *	buf_pool,
		ulint	size,
		ibool *	lru
	)

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 be released and reacquired. This function should only be used for allocating compressed page frames.

Returns

allocated block, never NULL

Parameters

buf_pool	in/out: buffer pool in which the page resides
size	in: compressed page size (between UNIV_ZIP_SIZE_MIN and UNIV_PAGE_SIZE)
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

UNIV_INLINE void buf_buddy_free	(	buf_pool_t *	buf_pool,
		void *	buf,
		ulint	size
	)

Deallocate a block.

Parameters

buf_pool	in/out: buffer pool in which the block resides
buf	in: block to be freed, must not be pointed to by the buffer pool
size	in: block size, up to UNIV_PAGE_SIZE