void Lock(Transaction transaction)
{
Monitor.Enter(this);
if (OwningTransaction == null)
{
//Acquire the transaction lock if(transaction != null)
OwningTransaction = transaction;
Monitor.Exit(this);
return;
}
else //Some transaction owns the lock
{
//We're done if it's the same one as the method parameter
if (OwningTransaction == transaction)
{
Monitor.Exit(this);
return;
} //Otherwise, need to acquire the transaction lock
else
{
ManualResetEvent manualEvent = new ManualResetEvent(false);
KeyValuePair <Transaction, ManualResetEvent> pair = new KeyValuePair <Transaction, ManualResetEvent>(transaction, manualEvent);
PendingTransactions.AddLast(pair);
if (transaction != null)
{
transaction.TransactionCompleted += (sender, e) =>
{
lock (this)
{
//Pair may have already been removed if unlocked
PendingTransactions.Remove(pair);
}
lock (manualEvent)
{
if (!manualEvent.SafeWaitHandle.IsClosed)
{
manualEvent.Set();
}
}
};
}
Monitor.Exit(this);
//Block the transaction or the calling thread
manualEvent.WaitOne();
lock (manualEvent)
manualEvent.Close();
}
}
}