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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 _trnman_h
#define _trnman_h
C_MODE_START
#include <lf.h>
#include "trnman_public.h"
#include "ma_loghandler_lsn.h"
/**
trid - 6 uchar transaction identifier. Assigned when a transaction
is created. Transaction can always be identified by its trid,
even after transaction has ended.
short_id - 2-byte transaction identifier, identifies a running
transaction, is reassigned when transaction ends.
when short_id is 0, TRN is not initialized, for all practical purposes
it could be considered unused.
when commit_trid is MAX_TRID the transaction is running, otherwise it's
committed.
state_lock mutex protects the state of a TRN, that is whether a TRN
is committed/running/unused. Meaning that modifications of short_id and
commit_trid happen under this mutex.
*/
struct st_ma_transaction
{
LF_PINS *pins;
WT_THD *wt;
mysql_mutex_t state_lock;
void *used_tables; /**< Tables used by transaction */
TRN *next, *prev;
TrID trid, min_read_from, commit_trid;
LSN rec_lsn, undo_lsn;
LSN_WITH_FLAGS first_undo_lsn;
uint locked_tables;
uint16 short_id;
uint16 flags; /**< Various flags */
};
#define TRANSACTION_LOGGED_LONG_ID ULL(0x8000000000000000)
#define MAX_TRID (~(TrID)0)
extern WT_RESOURCE_TYPE ma_rc_dup_unique;
#ifdef HAVE_PSI_INTERFACE
extern PSI_mutex_key key_LOCK_trn_list, key_TRN_state_lock;
#endif
C_MODE_END
#endif
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