internal static ActiveTxnRecord GetOldestRecord(TxnContext upTo)
{
var context = TxnContext.Head;
ActiveTxnRecord oldestRecord = null;
TxnContext prevContext = null;
while (context != upTo)
{
var contextOldest = context.OldestRequiredRecord;
if (oldestRecord == null || (contextOldest != null && oldestRecord.TxNumber > contextOldest.TxNumber))
{
oldestRecord = contextOldest;
}
if (!context.OwningThread.IsAlive && prevContext != null)
{
prevContext.Next = context.Next;
}
prevContext = context;
context = context.Next;
}
return(oldestRecord);
}
private TxnContext(Thread thread, TxnContext next)
{
OwningThread = thread;
Next = next;
}