private async void ReceivePump()
{
// Read length.
var lengthBuffer = new byte[4];
int receiveLength;
try {
receiveLength = await Task.Factory.FromAsync(
(callback, state) => socket.BeginReceive(lengthBuffer, 0, lengthBuffer.Length,
SocketFlags.None, callback, state),
asyncResult => socket.EndReceive(asyncResult), null);
} catch (SocketException) {
System.Diagnostics.Debug.WriteLine("Socket read error; detaching");
Detach();
return;
}
if (receiveLength == 0 || receiveLength != 4)
{
// Failed?
ReceivePump();
return;
}
var length = BitConverter.ToInt32(lengthBuffer, 0);
// Read body.
var bodyBuffer = new byte[length];
int bodyOffset = 0;
while (bodyOffset != bodyBuffer.Length)
{
receiveLength = await Task.Factory.FromAsync(
(callback, state) => socket.BeginReceive(
bodyBuffer, bodyOffset, bodyBuffer.Length - bodyOffset,
SocketFlags.None, callback, state),
asyncResult => socket.EndReceive(asyncResult), null);
if (receiveLength == 0)
{
// Failed?
ReceivePump();
return;
}
bodyOffset += receiveLength;
}
// Emit message.
OnMessageReceived(bodyBuffer);
// Continue pumping.
Dispatch.Issue(() => ReceivePump());
}
public async Task Attach(CancellationToken cancellationToken)
{
System.Diagnostics.Debug.Assert(CurrentState == State.Idle);
SocketPermission permission = new SocketPermission(
NetworkAccess.Connect,
TransportType.Tcp,
kServerHostname,
kServerPort);
permission.Demand();
IPAddress ipAddress = new IPAddress(new byte[] { 127, 0, 0, 1 });
IPEndPoint ipEndPoint = new IPEndPoint(ipAddress, kServerPort);
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream,
ProtocolType.Tcp);
socket.Blocking = false;
socket.NoDelay = true;
socket.ReceiveBufferSize = 1024 * 1024;
socket.SendBufferSize = 1024 * 1024;
socket.ReceiveTimeout = 0;
socket.SendTimeout = 0;
OnStateChanged(State.Attaching);
while (true)
{
Task task = Task.Factory.FromAsync(socket.BeginConnect, socket.EndConnect, ipEndPoint, null);
try {
await task.WithCancellation(cancellationToken);
} catch (OperationCanceledException) {
socket.Close();
socket = null;
OnStateChanged(State.Idle);
return;
} catch (SocketException e) {
if (e.SocketErrorCode == SocketError.ConnectionRefused)
{
// Not found - emulator may still be starting.
System.Diagnostics.Debug.WriteLine("Connection refused; trying again...");
continue;
}
OnStateChanged(State.Idle);
return;
}
break;
}
// Start recv pump.
Dispatch.Issue(() => ReceivePump());
var fbb = BeginRequest();
AttachRequest.StartAttachRequest(fbb);
int requestDataOffset = AttachRequest.EndAttachRequest(fbb);
var response = await CommitRequest(fbb, RequestData.AttachRequest, requestDataOffset);
System.Diagnostics.Debug.Assert(response.ResponseDataType ==
ResponseData.AttachResponse);
var attachResponse = new AttachResponse();
response.GetResponseData(attachResponse);
// Open mmap to share memory.
memoryHandle = FileMapping.OpenFileMapping(
FileMapAccess.FILE_MAP_ALL_ACCESS, false, attachResponse.MemoryFile);
if (memoryHandle.IsInvalid)
{
System.Diagnostics.Debug.Fail("Unable to open target memory");
Detach();
return;
}
// Open mmap to code cache.
codeCacheHandle =
FileMapping.OpenFileMapping(FileMapAccess.FILE_MAP_ALL_ACCESS, false,
attachResponse.CodeCacheFile);
if (codeCacheHandle.IsInvalid)
{
System.Diagnostics.Debug.Fail("Unable to open target code cache");
Detach();
return;
}
codeCachePtr = FileMapping.MapViewOfFileEx(
codeCacheHandle, FileMapAccess.FILE_MAP_ALL_ACCESS, 0, 0,
attachResponse.CodeCacheSize, attachResponse.CodeCacheBase);
// Setup the memory system. This maps the emulator memory into our address
// space.
if (!Memory.InitializeMapping(memoryHandle))
{
Detach();
return;
}
OnStateChanged(State.Attached);
}