txn_method.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: txn_method.c,v 12.2 2005/07/21 18:21:45 bostic Exp $
 */

#include "db_config.h"

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#include <string.h>
#endif

#include "db_int.h"
#include "dbinc/txn.h"

/*
 * __txn_dbenv_create --
 *      Transaction specific initialization of the DB_ENV structure.
 *
 * PUBLIC: void __txn_dbenv_create __P((DB_ENV *));
 */
void
__txn_dbenv_create(dbenv)
        DB_ENV *dbenv;
{
        /*
         * !!!
         * Our caller has not yet had the opportunity to reset the panic
         * state or turn off mutex locking, and so we can neither check
         * the panic state or acquire a mutex in the DB_ENV create path.
         */
        dbenv->tx_max = DEF_MAX_TXNS;
}

/*
 * PUBLIC: int __txn_get_tx_max __P((DB_ENV *, u_int32_t *));
 */
int
__txn_get_tx_max(dbenv, tx_maxp)
        DB_ENV *dbenv;
        u_int32_t *tx_maxp;
{
        ENV_NOT_CONFIGURED(dbenv,
            dbenv->tx_handle, "DB_ENV->get_tx_max", DB_INIT_TXN);

        if (TXN_ON(dbenv)) {
                /* Cannot be set after open, no lock required to read. */
                *tx_maxp = ((DB_TXNREGION *)
                    ((DB_TXNMGR *)dbenv->tx_handle)->reginfo.primary)->maxtxns;
        } else
                *tx_maxp = dbenv->tx_max;
        return (0);
}

/*
 * __txn_set_tx_max --
 *      DB_ENV->set_tx_max.
 *
 * PUBLIC: int __txn_set_tx_max __P((DB_ENV *, u_int32_t));
 */
int
__txn_set_tx_max(dbenv, tx_max)
        DB_ENV *dbenv;
        u_int32_t tx_max;
{
        ENV_ILLEGAL_AFTER_OPEN(dbenv, "DB_ENV->set_tx_max");

        dbenv->tx_max = tx_max;
        return (0);
}

/*
 * PUBLIC: int __txn_get_tx_timestamp __P((DB_ENV *, time_t *));
 */
int
__txn_get_tx_timestamp(dbenv, timestamp)
        DB_ENV *dbenv;
        time_t *timestamp;
{
        *timestamp = dbenv->tx_timestamp;
        return (0);
}

/*
 * __txn_set_tx_timestamp --
 *      Set the transaction recovery timestamp.
 *
 * PUBLIC: int __txn_set_tx_timestamp __P((DB_ENV *, time_t *));
 */
int
__txn_set_tx_timestamp(dbenv, timestamp)
        DB_ENV *dbenv;
        time_t *timestamp;
{
        ENV_ILLEGAL_AFTER_OPEN(dbenv, "DB_ENV->set_tx_timestamp");

        dbenv->tx_timestamp = *timestamp;
        return (0);
}

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