Import BSDDB 4.7.25 (as of svn r89086)

xa/xa_map.c

@@ -0,0 +1,153 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1996,2008 Oracle.  All rights reserved.
+ *
+ * $Id: xa_map.c 63573 2008-05-23 21:43:21Z trent.nelson $
+ */
+
+#include "db_config.h"
+
+#include "db_int.h"
+#include "dbinc/txn.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;
+
+	env = TAILQ_FIRST(&DB_GLOBAL(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(envq), env, links);
+			TAILQ_INSERT_HEAD(&DB_GLOBAL(envq), env, links);
+			*envp = env;
+			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 *, roff_t *));
+ */
+int
+__db_xid_to_txn(env, xid, offp)
+	ENV *env;
+	XID *xid;
+	roff_t *offp;
+{
+	struct __txn_detail *td;
+
+	return (__txn_map_gid(env, (u_int8_t *)xid->data, &td, offp));
+}
+
+/*
+ * __db_map_rmid
+ *	Create a mapping between the specified rmid and environment.
+ *
+ * PUBLIC: int __db_map_rmid __P((int, ENV *));
+ */
+int
+__db_map_rmid(rmid, env)
+	int rmid;
+	ENV *env;
+{
+	env->xa_rmid = rmid;
+	TAILQ_INSERT_TAIL(&DB_GLOBAL(envq), env, links);
+	return (0);
+}
+
+/*
+ * __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_map_xid
+ *	Create a mapping between this XID and the transaction
+ *	"td" in the shared region.
+ *
+ * PUBLIC: int __db_map_xid __P((ENV *, XID *, TXN_DETAIL *));
+ */
+int
+__db_map_xid(env, xid, td)
+	ENV *env;
+	XID *xid;
+	TXN_DETAIL *td;
+{
+	TXN_SYSTEM_LOCK(env);
+	memcpy(td->xid, xid->data, XIDDATASIZE);
+	td->bqual = (u_int32_t)xid->bqual_length;
+	td->gtrid = (u_int32_t)xid->gtrid_length;
+	td->format = (int32_t)xid->formatID;
+	TXN_SYSTEM_UNLOCK(env);
+
+	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->xid, 0, sizeof(td->xid));
+}