return; // page doesn't exist or is missing page_latest info
}
- $revision = Revision::newFromPageId( $this->getId(), $latest );
+ // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always includes the
+ // latest changes committed. This is true even within REPEATABLE-READ transactions, where
+ // S1 normally only sees changes committed before the first S1 SELECT. Thus we need S1 to
+ // also gets the revision row FOR UPDATE; otherwise, it may not find it since a page row
+ // UPDATE and revision row INSERT by S2 may have happened after the first S1 SELECT.
+ // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
+ $flags = ( $this->mDataLoadedFrom == self::DATA_FOR_UPDATE ) ? Revision::LOCKING_READ : 0;
+ $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
if ( $revision ) { // sanity
$this->setLastEdit( $revision );
}