mariadb/storage/xtradb/include/dict0boot.ic

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Copyright (c) 1996, 2012, Oracle and/or its affiliates. All Rights Reserved.

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

/**************************************************//**
@file include/dict0boot.ic
Data dictionary creation and booting

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

/**********************************************************************//**
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);
}

/*********************************************************************//**
Check if a table id belongs to  system table.
@return true if the table id belongs to a system table. */
UNIV_INLINE
bool
dict_is_sys_table(
/*==============*/
	table_id_t	id)		/*!< in: table id to check */
{
	return(id < DICT_HDR_FIRST_ID);
}