/// <summary>
/// Tries to initialize the Registered I/O handle.
/// </summary>
/// <param name="socket">A descriptor that identifies a socket.</param>
/// <param name="result">Contains valid object if operation was successful, <c>null</c> otherwise.</param>
/// <returns><c>true</c> if operation was successful, <c>false</c> otherwise.</returns>
public static unsafe Boolean TryCreate(SOCKET socket, out RIOHandle result)
{
// get function table id
var functionTableId = WinsockInterop.WSAID_MULTIPLE_RIO;
// initialize functions table
var functionTable = new RIO_EXTENSION_FUNCTION_TABLE();
// get table size
var tableSize = (UInt32)sizeof(RIO_EXTENSION_FUNCTION_TABLE);
// will contain actual table size
UInt32 actualTableSize;
// try get registered IO functions table
var tryGetTableResult = WinsockInterop.WSAIoctl(socket, WinsockInterop.SIO_GET_MULTIPLE_EXTENSION_FUNCTION_POINTER, &functionTableId, 16, &functionTable, tableSize, out actualTableSize, IntPtr.Zero, IntPtr.Zero);
// check if attempt was successful
if (tryGetTableResult == WinsockInterop.SOCKET_ERROR)
{
result = null;
// return fail
return(false);
}
// create registered I/O handle
result = new RIOHandle(ref functionTable);
// return success
return(true);
}
/// <summary>
/// Deactivates server.
/// </summary>
public WinsockErrorCode Deactivate()
{
// try close socket
var tryCloseResultCode = WinsockInterop.closesocket(serverSocket);
if (tryCloseResultCode == WinsockInterop.SOCKET_ERROR)
{
goto FAIL;
}
return(WinsockErrorCode.None);
FAIL:
return((WinsockErrorCode)WinsockInterop.WSAGetLastError());
}
public TryResult <TcpConnection> TryAccept()
{
SOCKADDR address;
var length = SOCKADDR.Size;
// permit an incoming connection attempt on a socket
var acceptedSocket = WinsockInterop.accept(serverSocket, out address, ref length);
// ReSharper disable once InvertIf
if (acceptedSocket == WinsockInterop.INVALID_SOCKET)
{
// get last error
var errorCode = (WinsockErrorCode)WinsockInterop.WSAGetLastError();
// return result
return(TryResult <TcpConnection> .CreateFail(errorCode));
}
// try create connection
return(workers[0].TryCreateConnection(acceptedSocket, acceptedSocket.ToUInt32()));
}
internal TryResult <TcpConnection> TryCreateConnection(SOCKET socket, UInt64 id)
{
var maxOutstandingReceive = 10u;
var maxOutstandingSend = 10u;
// try create request queue
var requestQueue = RioHandle.CreateRequestQueue(socket, maxOutstandingReceive, 1, maxOutstandingSend, 1, CompletionQueue, CompletionQueue, id);
if (requestQueue == WinsockInterop.RIO_INVALID_RQ)
{
var errorCode = (WinsockErrorCode)WinsockInterop.WSAGetLastError();
TryResult <TcpConnection> .CreateFail(errorCode);
}
var connection = new TcpConnection(socket, requestQueue);
// add connection into the collection of the connections
Connections.TryAdd(id, connection);
return(TryResult <TcpConnection> .CreateSuccess(connection));
}
/// <summary>
/// Tries to create a new instance of the <see cref="IocpWorker" />.
/// </summary>
/// <param name="rioHandle">The object that provides work with Winsock registered I/O extensions.</param>
/// <param name="processorIndex">The index of the processor.</param>
/// <param name="segmentLength">The length of the segment.</param>
/// <param name="segmentsCount">The count of the segments.</param>
/// <returns>
/// An instance of <see cref="TryResult{T}" /> which encapsulates result of the operation.
/// <see cref="TryResult{T}.Success" /> contains <c>true</c> if operation was successful, <c>false</c> otherwise.
/// <see cref="TryResult{T}.Result" /> contains valid object if operation was successful, <c>null</c> otherwise.
/// </returns>
public static unsafe TryResult <IocpWorker> TryCreate(RIOHandle rioHandle, Int32 processorIndex, UInt32 segmentLength, UInt32 segmentsCount)
{
#region 0 try create completion port
var completionPort = KernelInterop.CreateIoCompletionPort(KernelInterop.INVALID_HANDLE_VALUE, IntPtr.Zero, UIntPtr.Zero, 0);
// check if operation has succeed
if (completionPort == IntPtr.Zero)
{
// get error code
var kernelErrorCode = (KernelErrorCode)KernelInterop.GetLastError();
// return fail result
TryResult <IocpWorker> .CreateFail(kernelErrorCode);
}
#endregion
#region 1 try create completion queue
// compose completion method structure
var completionMethod = new RIO_NOTIFICATION_COMPLETION
{
// set type to IOCP
Type = RIO_NOTIFICATION_COMPLETION_TYPE.RIO_IOCP_COMPLETION,
union =
{
// set IOCP parameters
Iocp = new RIO_NOTIFICATION_COMPLETION.UNION.IOCP
{
// set completion port
IocpHandle = completionPort,
// set completion key
CompletionKey = (UInt64)processorIndex,
Overlapped = (NativeOverlapped *)-1
}
}
};
// try create completion queue
var completionQueue = rioHandle.CreateCompletionQueue(maxOutsandingCompletions, completionMethod);
if (completionQueue == WinsockInterop.RIO_INVALID_CQ)
{
// get error code
var winsockErrorCode = (WinsockErrorCode)WinsockInterop.WSAGetLastError();
// return fail result
TryResult <IocpWorker> .CreateFail(winsockErrorCode);
}
#endregion
#region 2 try create buffer pool
var tryCreateBufferPool = RIOBufferPool.TryCreate(rioHandle, segmentLength, segmentsCount);
if (tryCreateBufferPool.Success == false)
{
// return result
return(TryResult <IocpWorker> .CreateFail(tryCreateBufferPool.KernelErrorCode, tryCreateBufferPool.WinsockErrorCode));
}
#endregion
// success
var result = new IocpWorker(rioHandle, processorIndex, completionPort, completionQueue, tryCreateBufferPool.Result);
// return success result
return(TryResult <IocpWorker> .CreateSuccess(result));
}
/// <summary>
/// Tries to create a new instance of the <see cref="RIOBufferPool" />.
/// </summary>
/// <param name="rioHandle">The object that provides work with Winsock registered I/O extensions.</param>
/// <param name="segmentLength">The length of the segment.</param>
/// <param name="segmentsCount">The count of the segments.</param>
/// <returns>
/// An instance of <see cref="TryResult{T}" /> which encapsulates result of the operation.
/// <see cref="TryResult{T}.Success" /> contains <c>true</c> if operation was successful, <c>false</c> otherwise.
/// <see cref="TryResult{T}.Result" /> contains valid object if operation was successful, <c>null</c> otherwise.
/// </returns>
/// <remarks>
/// The multiplication of <paramref name="segmentLength" /> and <paramref name="segmentsCount" /> must produce value that is aligned to Memory Allocation Granularity.
/// </remarks>
public static unsafe TryResult <RIOBufferPool> TryCreate(RIOHandle rioHandle, UInt32 segmentLength, UInt32 segmentsCount)
{
// calculate size of the memory buffer to allocate
var bufferLength = segmentLength * segmentsCount;
void *memoryPointer;
IntPtr buffer;
IntPtr bufferId;
// 1 try allocate memory block
{
// try reserve and commit memory block
memoryPointer = KernelInterop.VirtualAlloc(null, bufferLength, KernelInterop.MEM_COMMIT | KernelInterop.MEM_RESERVE, KernelInterop.PAGE_READWRITE);
// check if allocation has failed
if (memoryPointer == null)
{
// get kernel error code
var kernelErrorCode = (KernelErrorCode)KernelInterop.GetLastError();
// return result
return(TryResult <RIOBufferPool> .CreateFail(kernelErrorCode));
}
// set buffer
buffer = (IntPtr)memoryPointer;
}
// 2 try register buffer with Registered I/O extensions
{
bufferId = rioHandle.RegisterBuffer(buffer, bufferLength);
if (bufferId == WinsockInterop.RIO_INVALID_BUFFERID)
{
// get winsock error code
var winsockErrorCode = (WinsockErrorCode)WinsockInterop.WSAGetLastError();
// free allocated memory
var freeResult = KernelInterop.VirtualFree(memoryPointer, 0, KernelInterop.MEM_RELEASE);
// set kernel error code
if (freeResult)
{
// return result
return(TryResult <RIOBufferPool> .CreateFail(winsockErrorCode));
}
// get kernel error code
var kernelErrorCode = (KernelErrorCode)KernelInterop.GetLastError();
// return result
return(TryResult <RIOBufferPool> .CreateFail(kernelErrorCode, winsockErrorCode));
}
}
// 3 success
var result = new RIOBufferPool(buffer, bufferLength, bufferId, segmentLength, segmentsCount);
// return result
return(TryResult <RIOBufferPool> .CreateSuccess(result));
}
private static Boolean TryConfigureBindAndStartListen(SOCKET serverSocket, TcpServerSettings settings)
{
// try disable use of the Nagle algorithm if requested
if (settings.UseNagleAlgorithm == false)
{
var optionValue = -1;
unsafe
{
var tryDisableNagle = WinsockInterop.setsockopt(serverSocket, WinsockInterop.IPPROTO_TCP, WinsockInterop.TCP_NODELAY, (Byte *)&optionValue, sizeof(Int32));
// check if attempt has succeed
if (tryDisableNagle == WinsockInterop.SOCKET_ERROR)
{
return(false);
}
}
}
// try enable faster operations on the loopback if requested
if (settings.UseFastLoopback)
{
unsafe
{
UInt32 optionValue = 1;
UInt32 dwBytes;
var tryEnableFastLoopbackResult = WinsockInterop.WSAIoctl(serverSocket, WinsockInterop.SIO_LOOPBACK_FAST_PATH, &optionValue, sizeof(UInt32), null, 0, out dwBytes, IntPtr.Zero, IntPtr.Zero);
// check if attempt has succeed
if (tryEnableFastLoopbackResult == WinsockInterop.SOCKET_ERROR)
{
return(false);
}
}
}
// try bind
{
// compose address
var address = new IN_ADDR
{
s_addr = 0
};
// compose socket address
var socketAddress = new SOCKADDR_IN
{
sin_family = WinsockInterop.AF_INET,
sin_port = WinsockInterop.htons(settings.Port),
sin_addr = address
};
// try associate address with socket
var tryBindResult = WinsockInterop.bind(serverSocket, ref socketAddress, SOCKADDR_IN.Size);
if (tryBindResult == WinsockInterop.SOCKET_ERROR)
{
return(false);
}
}
// try start listen
{
var tryStartListen = WinsockInterop.listen(serverSocket, settings.AcceptBacklogLength);
if (tryStartListen == WinsockInterop.SOCKET_ERROR)
{
return(false);
}
}
return(true);
}
/// <summary>
/// Activates server.
/// </summary>
public static TryResult <TcpWorker> TryInitialize(TcpServerSettings settings)
{
// 0 try initiates use of the Winsock DLL by a process
{
WSADATA data;
var startupResultCode = WinsockInterop.WSAStartup(WinsockInterop.Version, out data);
// check if startup was successful
if (startupResultCode != WinsockErrorCode.None)
{
return(TryResult <TcpWorker> .CreateFail(startupResultCode));
}
}
// 1 try create server socket
SOCKET serverSocket;
{
serverSocket = WinsockInterop.WSASocket(WinsockInterop.AF_INET, (Int32)SocketType.Stream, (Int32)ProtocolType.Tcp, IntPtr.Zero, 0, WinsockInterop.WSA_FLAG_REGISTERED_IO);
// check if socket created
if (WinsockInterop.INVALID_SOCKET == serverSocket)
{
goto FAIL;
}
}
// 2 try initialize Registered I/O extension
RIOHandle rioHandle;
if (!RIOHandle.TryCreate(serverSocket, out rioHandle))
{
goto FAIL;
}
// 3 get count of processors
var processorsCount = Environment.ProcessorCount;
// 4 create collection of the IOCP workers
var workers = new IocpWorker[processorsCount];
// initialize workers
for (var processorIndex = 0; processorIndex < processorsCount; processorIndex++)
{
// try create worker
var tryCreateWorker = IocpWorker.TryCreate(rioHandle, processorIndex, 4096, 1024);
// check if operation has succeed
if (!tryCreateWorker.Success)
{
goto FAIL;
}
// add to collection
workers[processorIndex] = tryCreateWorker.Result;
}
// try configure server socket and start listen
if (!TryConfigureBindAndStartListen(serverSocket, settings))
{
goto FAIL;
}
// success
var server = new TcpWorker(serverSocket, rioHandle, workers);
foreach (var worker in workers)
{
worker.thread.Start();
}
return(TryResult <TcpWorker> .CreateSuccess(server));
FAIL:
// get last error
var errorCode = (WinsockErrorCode)WinsockInterop.WSAGetLastError();
// terminate use of the Winsock DLL
WinsockInterop.WSACleanup();
// return fail
return(TryResult <TcpWorker> .CreateFail(errorCode));
}
