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