bzr commit into mysql-5.5-innodb branch (marko.makela:3295)

[marko.makela]

#At file:///home/marko/innobase/dev/mysql2a/5.5-innodb/ based on revid:marko.makela@strippedsoiobnw0wf1q

 3295 Marko Mäkelä	2011-01-27 [merge]
      Merge mysql-5.1-innodb to mysql-5.5-innodb.

    modified:
      storage/innobase/include/trx0trx.h
      storage/innobase/trx/trx0trx.c
=== modified file 'storage/innobase/include/trx0trx.h'
--- a/storage/innobase/include/trx0trx.h	revid:marko.makela@strippedsoiobnw0wf1q
+++ b/storage/innobase/include/trx0trx.h	revid:marko.makela@stripped1
@@ -214,12 +214,12 @@ trx_recover_for_mysql(
 /*******************************************************************//**
 This function is used to find one X/Open XA distributed transaction
 which is in the prepared state
-@return	trx or NULL */
+@return	trx or NULL; on match, the trx->xid will be invalidated */
 UNIV_INTERN
 trx_t *
 trx_get_trx_by_xid(
 /*===============*/
-	XID*	xid);	/*!< in: X/Open XA transaction identification */
+	const XID*	xid);	/*!< in: X/Open XA transaction identifier */
 /**********************************************************************//**
 If required, flushes the log to disk if we called trx_commit_for_mysql()
 with trx->flush_log_later == TRUE.

=== modified file 'storage/innobase/trx/trx0trx.c'
--- a/storage/innobase/trx/trx0trx.c	revid:[e-mail]-20110127081200-xib4soiobnw0wf1q
+++ b/storage/innobase/trx/trx0trx.c	revid:marko.makela@stripped10127113059-g5s3u7pdce5ps6g1
@@ -2004,18 +2004,18 @@ trx_recover_for_mysql(
 /*******************************************************************//**
 This function is used to find one X/Open XA distributed transaction
 which is in the prepared state
-@return	trx or NULL */
+@return	trx or NULL; on match, the trx->xid will be invalidated */
 UNIV_INTERN
 trx_t*
 trx_get_trx_by_xid(
 /*===============*/
-	XID*	xid)	/*!< in: X/Open XA transaction identification */
+	const XID*	xid)	/*!< in: X/Open XA transaction identifier */
 {
 	trx_t*	trx;
 
 	if (xid == NULL) {
 
-		return (NULL);
+		return(NULL);
 	}
 
 	mutex_enter(&kernel_mutex);
@@ -2028,10 +2028,16 @@ trx_get_trx_by_xid(
 		of gtrid_length+bqual_length bytes should be
 		the same */
 
-		if (xid->gtrid_length == trx->xid.gtrid_length
+		if (trx->conc_state == TRX_PREPARED
+		    && xid->gtrid_length == trx->xid.gtrid_length
 		    && xid->bqual_length == trx->xid.bqual_length
 		    && memcmp(xid->data, trx->xid.data,
 			      xid->gtrid_length + xid->bqual_length) == 0) {
+
+			/* Invalidate the XID, so that subsequent calls
+			will not find it. */
+			memset(&trx->xid, 0, sizeof(trx->xid));
+			trx->xid.formatID = -1;
 			break;
 		}
 
@@ -2040,14 +2046,5 @@ trx_get_trx_by_xid(
 
 	mutex_exit(&kernel_mutex);
 
-	if (trx) {
-		if (trx->conc_state != TRX_PREPARED) {
-
-			return(NULL);
-		}
-
-		return(trx);
-	} else {
-		return(NULL);
-	}
+	return(trx);
 }

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