private void Run(AsyncIOOperation ioOperation)
{
lock (this)
{
if (_stopped)
{
throw new IOException("IO stopped", NativeMethods.ERROR_OPERATION_ABORTED);
}
if (_runningOperation != null)
{
if (_nextOperation == null)
{
_nextOperation = ioOperation;
// If there is an active read cancel it
if (_runningOperation is AsyncReadOperation)
{
NativeMethods.HttpTryCancelIO(_handler);
}
}
else
{
throw new InvalidOperationException("Only one queued operation is allowed");
}
}
else
{
// we are just starting operation so there would be no
// continuation registered
var completed = ioOperation.Invoke() != null;
// operation went async
if (!completed)
{
_runningOperation = ioOperation;
}
}
}
}
public void NotifyCompletion(int hr, int bytes)
{
AsyncIOOperation.AsyncContinuation continuation;
AsyncIOOperation.AsyncContinuation?nextContinuation = null;
lock (this)
{
Debug.Assert(_runningOperation != null);
continuation = _runningOperation.Complete(hr, bytes);
var next = _nextOperation;
_nextOperation = null;
_runningOperation = null;
if (next != null)
{
if (_stopped)
{
// Abort next operation if IO is stopped
nextContinuation = next.Complete(NativeMethods.ERROR_OPERATION_ABORTED, 0);
}
else
{
nextContinuation = next.Invoke();
// operation went async
if (nextContinuation == null)
{
_runningOperation = next;
}
}
}
}
continuation.Invoke();
nextContinuation?.Invoke();
}