bk commit into 6.0 tree (jas:1.2786)

[U-ROWVWADEjas]

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ChangeSet@stripped, 2008-01-23 12:11:10-05:00, jas@rowvwade. +1 -0
  Get a temporary lock on a dependency transaction during
  transaction start to ensure a stable view.

  storage/falcon/Transaction.cpp@stripped, 2008-01-23 12:11:02-05:00, jas@rowvwade. +2 -2
    Get a temporary lock on a dependency transaction during
    transaction start to ensure a stable view.

diff -Nrup a/storage/falcon/Transaction.cpp b/storage/falcon/Transaction.cpp
--- a/storage/falcon/Transaction.cpp	2008-01-22 17:40:59 -05:00
+++ b/storage/falcon/Transaction.cpp	2008-01-23 12:11:02 -05:00
@@ -159,12 +159,13 @@ void Transaction::initialize(Connection*
 		}
 	
 	if (count)
-		{
 		for (Transaction *transaction = transactionManager->activeTransactions.first;
transaction; transaction = transaction->next)
 			if (transaction->isActive() && 
 				 !transaction->systemTransaction &&
 				 transaction->transactionId < transactionId)
 				{
+				Sync syncDependency(&transaction->syncObject, "Transaction::initialize");
+				syncDependency.lock(Shared);
 				transaction->addRef();
 				INTERLOCKED_INCREMENT(transaction->dependencies);
 
@@ -186,7 +187,6 @@ void Transaction::initialize(Connection*
 					transaction->release();
 					}
 				}
-		}
 
 	state = Active;
 }