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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997, 1998, 1999
* Sleepycat Software. All rights reserved.
*/
#include "db_config.h"
#ifndef lint
static const char sccsid[] = "@(#)xa_map.c 11.1 (Sleepycat) 7/25/99";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#include <string.h>
#endif
#include "db_int.h"
#include "txn.h"
/*
* This file contains all the mapping information that we need to support
* the DB/XA interface.
*/
/*
* CDB___db_rmid_to_env
* Return the environment associated with a given XA rmid.
*
* PUBLIC: int CDB___db_rmid_to_env __P((int rmid, DB_ENV **envp));
*/
int
CDB___db_rmid_to_env(rmid, envp)
int rmid;
DB_ENV **envp;
{
DB_ENV *env;
env = TAILQ_FIRST(&DB_GLOBAL(db_envq));
if (env != NULL && env->xa_rmid == rmid) {
*envp = env;
return (0);
}
/*
* When we map an rmid, move that environment to be the first one in
* the list of environments, so we acquire the correct environment
* in DB->open.
*/
for (; env != NULL; env = TAILQ_NEXT(env, links))
if (env->xa_rmid == rmid) {
TAILQ_REMOVE(&DB_GLOBAL(db_envq), env, links);
TAILQ_INSERT_HEAD(&DB_GLOBAL(db_envq), env, links);
*envp = env;
return (0);
}
return (1);
}
/*
* CDB___db_xid_to_txn
* Return the txn that corresponds to this XID.
*
* PUBLIC: int CDB___db_xid_to_txn __P((DB_ENV *, XID *, size_t *));
*/
int
CDB___db_xid_to_txn(dbenv, xid, offp)
DB_ENV *dbenv;
XID *xid;
size_t *offp;
{
DB_TXNMGR *mgr;
DB_TXNREGION *tmr;
struct __txn_detail *td;
mgr = dbenv->tx_handle;
tmr = mgr->reginfo.primary;
/*
* Search the internal active transaction table to find the
* matching xid. If this is a performance hit, then we
* can create a hash table, but I doubt it's worth it.
*/
R_LOCK(dbenv, &mgr->reginfo);
for (td = SH_TAILQ_FIRST(&tmr->active_txn, __txn_detail);
td != NULL;
td = SH_TAILQ_NEXT(td, links, __txn_detail))
if (memcmp(xid->data, td->xid, XIDDATASIZE) == 0)
break;
R_UNLOCK(dbenv, &mgr->reginfo);
if (td == NULL)
return (EINVAL);
*offp = R_OFFSET(&mgr->reginfo, td);
return (0);
}
/*
* CDB___db_map_rmid
* Create a mapping between the specified rmid and environment.
*
* PUBLIC: int CDB___db_map_rmid __P((int, DB_ENV *));
*/
int
CDB___db_map_rmid(rmid, env)
int rmid;
DB_ENV *env;
{
env->xa_rmid = rmid;
TAILQ_INSERT_TAIL(&DB_GLOBAL(db_envq), env, links);
return (0);
}
/*
* CDB___db_unmap_rmid
* Destroy the mapping for the given rmid.
*
* PUBLIC: int CDB___db_unmap_rmid __P((int));
*/
int
CDB___db_unmap_rmid(rmid)
int rmid;
{
DB_ENV *e;
for (e = TAILQ_FIRST(&DB_GLOBAL(db_envq));
e->xa_rmid != rmid;
e = TAILQ_NEXT(e, links));
if (e == NULL)
return (EINVAL);
TAILQ_REMOVE(&DB_GLOBAL(db_envq), e, links);
return (0);
}
/*
* CDB___db_map_xid
* Create a mapping between this XID and the transaction at
* "off" in the shared region.
*
* PUBLIC: int CDB___db_map_xid __P((DB_ENV *, XID *, size_t));
*/
int
CDB___db_map_xid(env, xid, off)
DB_ENV *env;
XID *xid;
size_t off;
{
REGINFO *infop;
TXN_DETAIL *td;
infop = &((DB_TXNMGR *)env->tx_handle)->reginfo;
td = (TXN_DETAIL *)R_ADDR(infop, off);
R_LOCK(env, infop);
memcpy(td->xid, xid->data, XIDDATASIZE);
R_UNLOCK(env, infop);
return (0);
}
/*
* CDB___db_unmap_xid
* Destroy the mapping for the specified XID.
*
* PUBLIC: void CDB___db_unmap_xid __P((DB_ENV *, XID *, size_t));
*/
void
CDB___db_unmap_xid(env, xid, off)
DB_ENV *env;
XID *xid;
size_t off;
{
TXN_DETAIL *td;
COMPQUIET(xid, NULL);
td = (TXN_DETAIL *)R_ADDR(&((DB_TXNMGR *)env->tx_handle)->reginfo, off);
memset(td->xid, 0, sizeof(td->xid));
}
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