public UncheckedReaderWriterLock()
{
this.sentinelToken = new WaitingToken();
this.innerLock = new LightweightSpinLock();
this.id = Interlocked.Increment(ref counter);
this.readerCount = 0;
this.writerPending = 0;
}
public UncheckedReaderWriterLock()
{
this.sentinelToken = new WaitingToken();
this.innerLock = new LightweightSpinLock();
this.id = Interlocked.Increment(ref counter);
this.readerCount = 0;
this.writerPending = 0;
}
internal Transaction(System.Transactions.Transaction transaction, bool isAmbient)
{
this.internalTransaction = transaction;
this.isAmbient = isAmbient;
this.transactionId = Interlocked.Increment(ref transactionCounter);
this.atomicSectionLock = new LightweightSpinLock();
this.isolationLevel = this.MapIsolationLevel(transaction.IsolationLevel);
this.aborted = false;
this.registeredHandlers = new HashSet<ITransactionHandler>();
this.internalTransaction.EnlistVolatile(this, System.Transactions.EnlistmentOptions.EnlistDuringPrepareRequired);
}
private void WaitForWrite(WaitingToken wait)
{
int retry = 0;
while (true)
{
// Check if out token is the next and all readers has left
if (Interlocked.CompareExchange(ref this.sentinelToken.Next, wait, wait) == wait &&
Interlocked.CompareExchange(ref this.readerCount, 0, 0) == 0)
{
return;
}
LightweightSpinLock.SpinWait(ref retry);
}
}
public void Enter()
{
if (Interlocked.CompareExchange(ref this.held, 1, 0) == 0)
{
return;
}
int retry = 0;
while (true)
{
LightweightSpinLock.SpinWait(ref retry);
if ((this.held == 0) && (Interlocked.CompareExchange(ref this.held, 1, 0) == 0))
{
return;
}
}
}
public void EnterRead()
{
int retry = 0;
while (true)
{
if (Interlocked.CompareExchange(ref this.writerPending, 0, 0) == 0)
{
this.innerLock.Enter();
if (Interlocked.CompareExchange(ref this.writerPending, 0, 0) == 0)
{
Interlocked.Increment(ref this.readerCount);
}
this.innerLock.Exit();
break;
}
LightweightSpinLock.SpinWait(ref retry);
}
}