Added support for X/Open XA prepare, recover, commit and rollback.

innobase/include/trx0roll.h:
  Changed prototype of the function trx_rollback_or_clean_all_without_sess
  because this function is executed in a background thread.
innobase/include/trx0trx.h:
  Added support for X/Open XA prepare, recover and search by X/Open XA XID.
innobase/include/trx0undo.h:
  Added support for X/Open XA prepare and recover. We need to store X/Open XA XID
  to the undo log header for recovery.
innobase/log/log0recv.c:
  Create a thread to run trx_rollback_or_clean_all_without_sess function
  to rollback the uncommitted transactions which have no user session.
innobase/row/row0ins.c:
  Remove unnecessary variables.
innobase/trx/trx0roll.c:
  Changed so that trx_rollback_or_clean_all_without_sess is executed
  in a background thread. We should also leave all prepared transactions
  active to wait for commit or abort from MySQL.
innobase/trx/trx0sys.c:
  Only those rows which belong to the active transaction in crash recovery
  are undone.
innobase/trx/trx0trx.c:
  Added support for X/Open XA prepare and recover. We need to store X/Open XA
  XID to trx structure and left prepared transactions to wait for a
  commit or abort from MySQL. This requires also that we add TRX_PREPARED
  state to the transaction and TRX_UNDO_PREPARED state for undo logs.
innobase/trx/trx0undo.c:
  Added support for X/Open XA prepare and recover. We need to store X/Open XA
  XID to undo log header for recovery of distributed transactions.
sql/ha_innodb.h:
  Added prototypes for X/Open XA prepare, recover, commit and rollback.
sql/handler.h:
  Added definition for X/Open XA XID structure.

1 files changed, 43 insertions, 0 deletions

diff --git a/sql/ha_innodb.h b/sql/ha_innodb.h
index 5ec5c207456..a62c754707c 100644
--- a/sql/ha_innodb.h
+++ b/sql/ha_innodb.h
@@ -243,3 +243,46 @@ void innobase_release_temporary_latches(void* innobase_tid);
 void innobase_store_binlog_offset_and_flush_log(char *binlog_name,longlong offset);
 
 int innobase_start_trx_and_assign_read_view(THD* thd);
+
+/***********************************************************************
+This function is used to prepare X/Open XA distributed transaction   */
+
+int innobase_xa_prepare(
+/*====================*/
+			/* out: 0 or error number */
+	THD*	thd,	/* in: handle to the MySQL thread of the user
+			whose XA transaction should be prepared */
+	bool	all);	/* in: TRUE - commit transaction
+			FALSE - the current SQL statement ended */
+
+/***********************************************************************
+This function is used to recover X/Open XA distributed transactions   */
+
+int innobase_xa_recover(
+/*====================*/
+				/* out: number of prepared transactions 
+				stored in xid_list */
+	XID*    xid_list, 	/* in/out: prepared transactions */
+	uint	len);		/* in: number of slots in xid_list */
+
+/***********************************************************************
+This function is used to commit one X/Open XA distributed transaction
+which is in the prepared state */
+
+int innobase_commit_by_xid(
+/*=======================*/
+			/* out: 0 or error number */
+	XID*	xid);	/* in : X/Open XA Transaction Identification */
+
+/***********************************************************************
+This function is used to rollback one X/Open XA distributed transaction
+which is in the prepared state */
+
+int innobase_rollback_by_xid(
+			/* out: 0 or error number */
+	XID	*xid);	/* in : X/Open XA Transaction Idenfification */
+
+
+int innobase_xa_end(THD *thd);
+
+