mariadb/storage/innobase/include/dict0boot.ic

/*****************************************************************************

Copyright (c) 1996, 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/dict0boot.ic
Data dictionary creation and booting

Created 4/18/1996 Heikki Tuuri
*******************************************************/

/**********************************************************************//**
Writes the current value of the row id counter to the dictionary header file
page. */
UNIV_INTERN
void
dict_hdr_flush_row_id(void);
/*=======================*/


/**********************************************************************//**
Returns a new row id.
@return	the new id */
UNIV_INLINE
row_id_t
dict_sys_get_new_row_id(void)
/*=========================*/
{
	row_id_t	id;

	mutex_enter(&(dict_sys->mutex));

	id = dict_sys->row_id;

	if (0 == (id % DICT_HDR_ROW_ID_WRITE_MARGIN)) {

		dict_hdr_flush_row_id();
	}

	dict_sys->row_id++;

	mutex_exit(&(dict_sys->mutex));

	return(id);
}

/**********************************************************************//**
Reads a row id from a record or other 6-byte stored form.
@return	row id */
UNIV_INLINE
row_id_t
dict_sys_read_row_id(
/*=================*/
	const byte*	field)	/*!< in: record field */
{
#if DATA_ROW_ID_LEN != 6
# error "DATA_ROW_ID_LEN != 6"
#endif

	return(mach_read_from_6(field));
}

/**********************************************************************//**
Writes a row id to a record or other 6-byte stored form. */
UNIV_INLINE
void
dict_sys_write_row_id(
/*==================*/
	byte*		field,	/*!< in: record field */
	row_id_t	row_id)	/*!< in: row id */
{
#if DATA_ROW_ID_LEN != 6
# error "DATA_ROW_ID_LEN != 6"
#endif

	mach_write_to_6(field, row_id);
}