page0page.h

这是linux下运行的mysql软件包,可用于linux 下安装 php + mysql + apach 的网络配置

page_rec_set_next(
/*==============*/
	rec_t*	rec,	/* in: pointer to record, must not be
			page supremum */
	rec_t*	next);	/* in: pointer to next record, must not
			be page infimum */
/****************************************************************
Gets the pointer to the previous record. */
UNIV_INLINE
rec_t*
page_rec_get_prev(
/*==============*/
				/* out: pointer to previous record */
	rec_t*		rec);	/* in: pointer to record,
				must not be page infimum */
/****************************************************************
TRUE if the record is a user record on the page. */
UNIV_INLINE
ibool
page_rec_is_user_rec_low(
/*=====================*/
			/* out: TRUE if a user record */
	ulint	offset);/* in: record offset on page */
/****************************************************************
TRUE if the record is the supremum record on a page. */
UNIV_INLINE
ibool
page_rec_is_supremum_low(
/*=====================*/
			/* out: TRUE if the supremum record */
	ulint	offset);/* in: record offset on page */
/****************************************************************
TRUE if the record is the infimum record on a page. */
UNIV_INLINE
ibool
page_rec_is_infimum_low(
/*=====================*/
			/* out: TRUE if the infimum record */
	ulint	offset);/* in: record offset on page */

/****************************************************************
TRUE if the record is a user record on the page. */
UNIV_INLINE
ibool
page_rec_is_user_rec(
/*=================*/
				/* out: TRUE if a user record */
	const rec_t*	rec);	/* in: record */
/****************************************************************
TRUE if the record is the supremum record on a page. */
UNIV_INLINE
ibool
page_rec_is_supremum(
/*=================*/
				/* out: TRUE if the supremum record */
	const rec_t*	rec);	/* in: record */
/****************************************************************
TRUE if the record is the infimum record on a page. */
UNIV_INLINE
ibool
page_rec_is_infimum(
/*================*/
				/* out: TRUE if the infimum record */
	const rec_t*	rec);	/* in: record */
/*******************************************************************
Looks for the record which owns the given record. */
UNIV_INLINE
rec_t*
page_rec_find_owner_rec(
/*====================*/
			/* out: the owner record */
	rec_t*	rec);	/* in: the physical record */
/***************************************************************************
This is a low-level operation which is used in a database index creation
to update the page number of a created B-tree to a data dictionary
record. */

void
page_rec_write_index_page_no(
/*=========================*/
	rec_t*	rec,	/* in: record to update */
	ulint	i,	/* in: index of the field to update */
	ulint	page_no,/* in: value to write */
	mtr_t*	mtr);	/* in: mtr */
/****************************************************************
Returns the maximum combined size of records which can be inserted on top
of record heap. */
UNIV_INLINE
ulint
page_get_max_insert_size(
/*=====================*/
			/* out: maximum combined size for inserted records */
	page_t*	page,	/* in: index page */
	ulint	n_recs);	/* in: number of records */
/****************************************************************
Returns the maximum combined size of records which can be inserted on top
of record heap if page is first reorganized. */
UNIV_INLINE
ulint
page_get_max_insert_size_after_reorganize(
/*======================================*/
			/* out: maximum combined size for inserted records */
	page_t*	page,	/* in: index page */
	ulint	n_recs);/* in: number of records */
/*****************************************************************
Calculates free space if a page is emptied. */
UNIV_INLINE
ulint
page_get_free_space_of_empty(
/*=========================*/
			/* out: free space */
	ulint	comp)	/* in: nonzero=compact page format */
		__attribute__((const));
/****************************************************************
Returns the sum of the sizes of the records in the record list
excluding the infimum and supremum records. */
UNIV_INLINE
ulint
page_get_data_size(
/*===============*/
			/* out: data in bytes */
	page_t*	page);	/* in: index page */
/****************************************************************
Allocates a block of memory from an index page. */

byte*
page_mem_alloc(
/*===========*/
				/* out: pointer to start of allocated
				buffer, or NULL if allocation fails */
	page_t*		page,	/* in: index page */
	ulint		need,	/* in: number of bytes needed */
	dict_index_t*	index,	/* in: record descriptor */
	ulint*		heap_no);/* out: this contains the heap number
				of the allocated record
				if allocation succeeds */
/****************************************************************
Puts a record to free list. */
UNIV_INLINE
void
page_mem_free(
/*==========*/
	page_t*		page,	/* in: index page */
	rec_t*		rec,	/* in: pointer to the (origin of) record */
	const ulint*	offsets);/* in: array returned by rec_get_offsets() */
/**************************************************************
The index page creation function. */

page_t* 
page_create(
/*========*/
					/* out: pointer to the page */
	buf_frame_t*	frame,		/* in: a buffer frame where the page is
					created */
	mtr_t*		mtr,		/* in: mini-transaction handle */
	ulint		comp);		/* in: nonzero=compact page format */
/*****************************************************************
Differs from page_copy_rec_list_end, because this function does not
touch the lock table and max trx id on page. */

void
page_copy_rec_list_end_no_locks(
/*============================*/
	page_t*		new_page,	/* in: index page to copy to */
	page_t*		page,		/* in: index page */
	rec_t*		rec,		/* in: record on page */
	dict_index_t*	index,		/* in: record descriptor */
	mtr_t*		mtr);		/* in: mtr */
/*****************************************************************
Copies records from page to new_page, from the given record onward,
including that record. Infimum and supremum records are not copied.
The records are copied to the start of the record list on new_page. */

void
page_copy_rec_list_end(
/*===================*/
	page_t*		new_page,	/* in: index page to copy to */
	page_t*		page,		/* in: index page */
	rec_t*		rec,		/* in: record on page */
	dict_index_t*	index,		/* in: record descriptor */
	mtr_t*		mtr);		/* in: mtr */
/*****************************************************************
Copies records from page to new_page, up to the given record, NOT
including that record. Infimum and supremum records are not copied.
The records are copied to the end of the record list on new_page. */

void
page_copy_rec_list_start(
/*=====================*/
	page_t*		new_page,	/* in: index page to copy to */
	page_t*		page,		/* in: index page */
	rec_t*		rec,		/* in: record on page */
	dict_index_t*	index,		/* in: record descriptor */
	mtr_t*		mtr);		/* in: mtr */
/*****************************************************************
Deletes records from a page from a given record onward, including that record.
The infimum and supremum records are not deleted. */

void
page_delete_rec_list_end(
/*=====================*/
	page_t*		page,	/* in: index page */
	rec_t*		rec,	/* in: record on page */
	dict_index_t*	index,	/* in: record descriptor */
	ulint		n_recs,	/* in: number of records to delete,
				or ULINT_UNDEFINED if not known */
	ulint		size,	/* in: the sum of the sizes of the
				records in the end of the chain to
				delete, or ULINT_UNDEFINED if not known */
	mtr_t*		mtr);	/* in: mtr */
/*****************************************************************
Deletes records from page, up to the given record, NOT including
that record. Infimum and supremum records are not deleted. */

void
page_delete_rec_list_start(
/*=======================*/
	page_t*		page,	/* in: index page */
	rec_t*		rec,	/* in: record on page */
	dict_index_t*	index,	/* in: record descriptor */
	mtr_t*		mtr);	/* in: mtr */
/*****************************************************************
Moves record list end to another page. Moved records include
split_rec. */

void
page_move_rec_list_end(
/*===================*/
	page_t*		new_page,	/* in: index page where to move */
	page_t*		page,		/* in: index page */
	rec_t*		split_rec,	/* in: first record to move */
	dict_index_t*	index,		/* in: record descriptor */
	mtr_t*		mtr);		/* in: mtr */
/*****************************************************************
Moves record list start to another page. Moved records do not include
split_rec. */

void
page_move_rec_list_start(
/*=====================*/
	page_t*		new_page,	/* in: index page where to move */
	page_t*		page,		/* in: index page */
	rec_t*		split_rec,	/* in: first record not to move */
	dict_index_t*	index,		/* in: record descriptor */
	mtr_t*		mtr);		/* in: mtr */
/********************************************************************
Splits a directory slot which owns too many records. */

void
page_dir_split_slot(
/*================*/
	page_t*	page, 		/* in: the index page in question */
	ulint	slot_no); 	/* in: the directory slot */
/*****************************************************************
Tries to balance the given directory slot with too few records
with the upper neighbor, so that there are at least the minimum number 
of records owned by the slot; this may result in the merging of 
two slots. */

void
page_dir_balance_slot(
/*==================*/
	page_t*	page,		/* in: index page */
	ulint	slot_no); 	/* in: the directory slot */
/**************************************************************
Parses a log record of a record list end or start deletion. */

byte*
page_parse_delete_rec_list(
/*=======================*/
				/* out: end of log record or NULL */
	byte		type,	/* in: MLOG_LIST_END_DELETE,
				MLOG_LIST_START_DELETE,
				MLOG_COMP_LIST_END_DELETE or
				MLOG_COMP_LIST_START_DELETE */
	byte*		ptr,	/* in: buffer */
	byte*		end_ptr,/* in: buffer end */
	dict_index_t*	index,	/* in: record descriptor */
	page_t*		page,	/* in: page or NULL */
	mtr_t*		mtr);	/* in: mtr or NULL */
/***************************************************************
Parses a redo log record of creating a page. */

byte*
page_parse_create(
/*==============*/
			/* out: end of log record or NULL */
	byte*	ptr,	/* in: buffer */
	byte*	end_ptr,/* in: buffer end */
	ulint	comp,	/* in: nonzero=compact page format */
	page_t*	page,	/* in: page or NULL */
	mtr_t*	mtr);	/* in: mtr or NULL */
/****************************************************************
Prints record contents including the data relevant only in
the index page context. */
 
void
page_rec_print(
/*===========*/
	rec_t*		rec,	/* in: physical record */
	const ulint*	offsets);/* in: record descriptor */
/*******************************************************************
This is used to print the contents of the directory for
debugging purposes. */

void
page_dir_print(
/*===========*/
	page_t*	page,	/* in: index page */
	ulint	pr_n);	/* in: print n first and n last entries */
/*******************************************************************
This is used to print the contents of the page record list for
debugging purposes. */

void
page_print_list(
/*============*/
	page_t*		page,	/* in: index page */
	dict_index_t*	index,	/* in: dictionary index of the page */
	ulint		pr_n);	/* in: print n first and n last entries */
/*******************************************************************
Prints the info in a page header. */

void
page_header_print(
/*==============*/
	page_t*	page);
/*******************************************************************
This is used to print the contents of the page for
debugging purposes. */

void
page_print(
/*======*/
	page_t*		page,	/* in: index page */
	dict_index_t*	index,	/* in: dictionary index of the page */
	ulint		dn,	/* in: print dn first and last entries
				in directory */
	ulint		rn);	/* in: print rn first and last records
				in directory */
/*******************************************************************
The following is used to validate a record on a page. This function
differs from rec_validate as it can also check the n_owned field and
the heap_no field. */

ibool
page_rec_validate(
/*==============*/
				/* out: TRUE if ok */
	rec_t*		rec,	/* in: physical record */
	const ulint*	offsets);/* in: array returned by rec_get_offsets() */
/*******************************************************************
Checks that the first directory slot points to the infimum record and
the last to the supremum. This function is intended to track if the
bug fixed in 4.0.14 has caused corruption to users' databases. */

void
page_check_dir(
/*===========*/
	page_t*	page);	/* in: index page */
/*******************************************************************
This function checks the consistency of an index page when we do not
know the index. This is also resilient so that this should never crash
even if the page is total garbage. */

ibool
page_simple_validate(
/*=================*/
			/* out: TRUE if ok */
	page_t*	page);	/* in: index page */
/*******************************************************************
This function checks the consistency of an index page. */

ibool
page_validate(
/*==========*/
				/* out: TRUE if ok */
	page_t*		page,	/* in: index page */
	dict_index_t*	index);	/* in: data dictionary index containing
				the page record type definition */
/*******************************************************************
Looks in the page record list for a record with the given heap number. */

rec_t*
page_find_rec_with_heap_no(
/*=======================*/
			/* out: record, NULL if not found */
	page_t*	page,	/* in: index page */
	ulint	heap_no);/* in: heap number */

#ifdef UNIV_MATERIALIZE
#undef UNIV_INLINE
#define UNIV_INLINE  UNIV_INLINE_ORIGINAL
#endif

#ifndef UNIV_NONINL
#include "page0page.ic"
#endif

#endif