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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2001-2002
* Sleepycat Software. All rights reserved.
*/
#include "db_config.h"
#ifndef lint
static const char revid[] = "$Id: rep_region.c,v 1.29 2002/08/06 04:50:36 bostic Exp $";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#endif
#include <string.h>
#include "db_int.h"
#include "dbinc/rep.h"
#include "dbinc/log.h"
/*
* __rep_region_init --
* Initialize the shared memory state for the replication system.
*
* PUBLIC: int __rep_region_init __P((DB_ENV *));
*/
int
__rep_region_init(dbenv)
DB_ENV *dbenv;
{
REGENV *renv;
REGINFO *infop;
DB_MUTEX *db_mutexp;
DB_REP *db_rep;
REP *rep;
int ret;
db_rep = dbenv->rep_handle;
infop = dbenv->reginfo;
renv = infop->primary;
ret = 0;
MUTEX_LOCK(dbenv, &renv->mutex);
if (renv->rep_off == INVALID_ROFF) {
/* Must create the region. */
if ((ret = __db_shalloc(infop->addr,
sizeof(REP), MUTEX_ALIGN, &rep)) != 0)
goto err;
memset(rep, 0, sizeof(*rep));
rep->tally_off = INVALID_ROFF;
renv->rep_off = R_OFFSET(infop, rep);
if ((ret = __db_mutex_setup(dbenv, infop, &rep->mutex,
MUTEX_NO_RECORD)) != 0)
goto err;
/*
* We must create a place for the db_mutex separately;
* mutexes have to be aligned to MUTEX_ALIGN, and the only way
* to guarantee that is to make sure they're at the beginning
* of a shalloc'ed chunk.
*/
if ((ret = __db_shalloc(infop->addr, sizeof(DB_MUTEX),
MUTEX_ALIGN, &db_mutexp)) != 0)
goto err;
rep->db_mutex_off = R_OFFSET(infop, db_mutexp);
/*
* Because we have no way to prevent deadlocks and cannot log
* changes made to it, we single-thread access to the client
* bookkeeping database. This is suboptimal, but it only gets
* accessed when messages arrive out-of-order, so it should
* stay small and not be used in a high-performance app.
*/
if ((ret = __db_mutex_setup(dbenv, infop, db_mutexp,
MUTEX_NO_RECORD)) != 0)
goto err;
/* We have the region; fill in the values. */
rep->eid = DB_EID_INVALID;
rep->master_id = DB_EID_INVALID;
rep->gen = 0;
/*
* Set default values for the min and max log records that we
* wait before requesting a missing log record.
*/
rep->request_gap = DB_REP_REQUEST_GAP;
rep->max_gap = DB_REP_MAX_GAP;
} else
rep = R_ADDR(infop, renv->rep_off);
MUTEX_UNLOCK(dbenv, &renv->mutex);
db_rep->mutexp = &rep->mutex;
db_rep->db_mutexp = R_ADDR(infop, rep->db_mutex_off);
db_rep->region = rep;
return (0);
err: MUTEX_UNLOCK(dbenv, &renv->mutex);
return (ret);
}
/*
* __rep_region_destroy --
* Destroy any system resources allocated in the replication region.
*
* PUBLIC: int __rep_region_destroy __P((DB_ENV *));
*/
int
__rep_region_destroy(dbenv)
DB_ENV *dbenv;
{
DB_REP *db_rep;
int ret, t_ret;
ret = t_ret = 0;
db_rep = (DB_REP *)dbenv->rep_handle;
if (db_rep != NULL) {
if (db_rep->mutexp != NULL)
ret = __db_mutex_destroy(db_rep->mutexp);
if (db_rep->db_mutexp != NULL)
t_ret = __db_mutex_destroy(db_rep->db_mutexp);
}
return (ret == 0 ? t_ret : ret);
}
/*
* __rep_dbenv_close --
* Replication-specific destruction of the DB_ENV structure.
*
* PUBLIC: int __rep_dbenv_close __P((DB_ENV *));
*/
int
__rep_dbenv_close(dbenv)
DB_ENV *dbenv;
{
DB_REP *db_rep;
db_rep = (DB_REP *)dbenv->rep_handle;
if (db_rep != NULL) {
__os_free(dbenv, db_rep);
dbenv->rep_handle = NULL;
}
return (0);
}
/*
* __rep_preclose --
* If we are a client, shut down our client database and, if we're
* actually closing the environment, close all databases we've opened
* while applying messages.
*
* PUBLIC: int __rep_preclose __P((DB_ENV *, int));
*/
int
__rep_preclose(dbenv, do_closefiles)
DB_ENV *dbenv;
int do_closefiles;
{
DB *dbp;
DB_REP *db_rep;
int ret, t_ret;
ret = t_ret = 0;
/* If replication is not initialized, we have nothing to do. */
if ((db_rep = (DB_REP *)dbenv->rep_handle) == NULL)
return (0);
if ((dbp = db_rep->rep_db) != NULL) {
MUTEX_LOCK(dbenv, db_rep->db_mutexp);
ret = dbp->close(dbp, 0);
db_rep->rep_db = NULL;
MUTEX_UNLOCK(dbenv, db_rep->db_mutexp);
}
if (do_closefiles)
t_ret = __dbreg_close_files(dbenv);
return (ret == 0 ? t_ret : ret);
}
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