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/* Copyright (C) 2006-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
#ifndef _ma_trnman_h
#define _ma_trnman_h
/**
Sets table's trn and prints debug information
Links table into new_trn->used_instances
@param tbl MARIA_HA of table
@param newtrn what to put into tbl->trn
*/
static inline void _ma_set_trn_for_table(MARIA_HA *tbl, TRN *newtrn)
{
DBUG_PRINT("info",("table: %p trn: %p -> %p",
tbl, tbl->trn, newtrn));
/* check that we are not calling this twice in a row */
DBUG_ASSERT(newtrn->used_instances != (void*) tbl);
tbl->trn= newtrn;
/* Link into used list */
if (newtrn->used_instances)
((MARIA_HA*) newtrn->used_instances)->trn_prev= &tbl->trn_next;
tbl->trn_next= (MARIA_HA*) newtrn->used_instances;
tbl->trn_prev= (MARIA_HA**) &newtrn->used_instances;
newtrn->used_instances= tbl;
}
/*
Same as _ma_set_trn_for_table(), but don't link table into used_instance list
Used when we want to temporary set trn for a table in extra()
*/
static inline void _ma_set_tmp_trn_for_table(MARIA_HA *tbl, TRN *newtrn)
{
DBUG_PRINT("info",("table: %p trn: %p -> %p",
tbl, tbl->trn, newtrn));
tbl->trn= newtrn;
tbl->trn_prev= 0;
tbl->trn_next= 0; /* To avoid assert in ha_maria::close() */
}
/*
Reset TRN in table
*/
static inline void _ma_reset_trn_for_table(MARIA_HA *tbl)
{
DBUG_PRINT("info",("table: %p trn: %p -> NULL", tbl, tbl->trn));
/* The following is only false if tbl->trn == &dummy_transaction_object */
if (tbl->trn_prev)
{
if (tbl->trn_next)
tbl->trn_next->trn_prev= tbl->trn_prev;
*tbl->trn_prev= tbl->trn_next;
tbl->trn_prev= 0;
tbl->trn_next= 0;
}
tbl->trn= 0;
}
/*
Take over the used_instances link from a trn object
Reset the link in the trn object
*/
static inline void relink_trn_used_instances(MARIA_HA **used_tables, TRN *trn)
{
if (likely(*used_tables= (MARIA_HA*) trn->used_instances))
{
/* Check that first back link is correct */
DBUG_ASSERT((*used_tables)->trn_prev == (MARIA_HA **)&trn->used_instances);
/* Fix back link to point to new base for the list */
(*used_tables)->trn_prev= used_tables;
trn->used_instances= 0;
}
}
#endif /* _ma_trnman_h */
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