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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 2012 Oracle and/or its affiliates. All rights reserved.
*
* $Id$
*/
#include "db_config.h"
#include "db_int.h"
#include "dbinc/txn.h"
#include "dbinc_auto/xa_ext.h"
/*
* This file contains all the mapping information that we need to support
* the DB/XA interface.
*/
/*
* __db_rmid_to_env
* Return the environment associated with a given XA rmid.
*
* PUBLIC: int __db_rmid_to_env __P((int, ENV **));
*/
int
__db_rmid_to_env(rmid, envp)
int rmid;
ENV **envp;
{
ENV *env;
*envp = NULL;
if (TAILQ_EMPTY(&DB_GLOBAL(envq)))
TAILQ_INIT(&DB_GLOBAL(envq));
/*
* 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 = TAILQ_FIRST(&DB_GLOBAL(envq));
env != NULL; env = TAILQ_NEXT(env, links)) {
if (env->xa_rmid == rmid) {
*envp = env;
if (env != TAILQ_FIRST(&DB_GLOBAL(envq))) {
TAILQ_REMOVE(&DB_GLOBAL(envq), env, links);
TAILQ_INSERT_HEAD(&DB_GLOBAL(envq), env, links);
}
return (0);
}
}
return (1);
}
/*
* __db_xid_to_txn
* Return the txn that corresponds to this XID.
*
* PUBLIC: int __db_xid_to_txn __P((ENV *, XID *, TXN_DETAIL **));
*/
int
__db_xid_to_txn(env, xid, tdp)
ENV *env;
XID *xid;
TXN_DETAIL **tdp;
{
DB_TXNMGR *mgr;
DB_TXNREGION *region;
u_int8_t *gid;
mgr = env->tx_handle;
region = 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.
*/
TXN_SYSTEM_LOCK(env);
gid = (u_int8_t *)(xid->data);
SH_TAILQ_FOREACH(*tdp, ®ion->active_txn, links, __txn_detail)
if (memcmp(gid, (*tdp)->gid, sizeof((*tdp)->gid)) == 0)
break;
TXN_SYSTEM_UNLOCK(env);
/*
* This returns an error, because TXN_SYSTEM_{UN}LOCK may return
* an error.
*/
return (0);
}
/*
* __db_map_rmid
* Create a mapping between the specified rmid and environment.
*
* PUBLIC: void __db_map_rmid __P((int, ENV *));
*/
void
__db_map_rmid(rmid, env)
int rmid;
ENV *env;
{
env->xa_rmid = rmid;
TAILQ_INSERT_HEAD(&DB_GLOBAL(envq), env, links);
}
/*
* __db_unmap_rmid
* Destroy the mapping for the given rmid.
*
* PUBLIC: int __db_unmap_rmid __P((int));
*/
int
__db_unmap_rmid(rmid)
int rmid;
{
ENV *e;
for (e = TAILQ_FIRST(&DB_GLOBAL(envq));
e->xa_rmid != rmid;
e = TAILQ_NEXT(e, links))
;
if (e == NULL)
return (EINVAL);
TAILQ_REMOVE(&DB_GLOBAL(envq), e, links);
return (0);
}
/*
* __db_unmap_xid
* Destroy the mapping for the specified XID.
*
* PUBLIC: void __db_unmap_xid __P((ENV *, XID *, size_t));
*/
void
__db_unmap_xid(env, xid, off)
ENV *env;
XID *xid;
size_t off;
{
TXN_DETAIL *td;
COMPQUIET(xid, NULL);
td = R_ADDR(&env->tx_handle->reginfo, off);
memset(td->gid, 0, sizeof(td->gid));
}
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