在C#中,I/O Completion Ports (IOCP) 是一种高性能的I/O处理机制,它允许应用程序在处理大量并发连接时实现高效的资源利用
Socket
类创建一个异步套接字服务器。ThreadPool
线程池来处理I/O操作。SocketAsyncEventArgs
类来处理异步I/O操作。ManualResetEvent
或Semaphore
来同步I/O操作。以下是一个简单的示例,展示了如何在C#中使用IOCP来创建一个异步TCP服务器:
using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
class IOCPServer
{
private Socket _listener;
private ManualResetEvent _acceptDone = new ManualResetEvent(false);
public void StartListening(int port)
{
IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Any, port);
_listener = new Socket(localEndPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
_listener.Bind(localEndPoint);
_listener.Listen(100);
Console.WriteLine("Waiting for a connection...");
StartAccept();
}
private void StartAccept()
{
SocketAsyncEventArgs acceptArgs = new SocketAsyncEventArgs();
acceptArgs.Completed += Accept_Completed;
_acceptDone.Reset();
bool willRaiseEvent = _listener.AcceptAsync(acceptArgs);
if (!willRaiseEvent)
{
ProcessAccept(acceptArgs);
}
}
private void Accept_Completed(object sender, SocketAsyncEventArgs e)
{
ProcessAccept(e);
}
private void ProcessAccept(SocketAsyncEventArgs e)
{
if (e.SocketError == SocketError.Success)
{
Socket handler = e.AcceptSocket;
Console.WriteLine("Connection accepted from {0}", handler.RemoteEndPoint);
// Process the client request and send a response.
// You can use a separate thread or ThreadPool to handle the client request.
handler.Shutdown(SocketShutdown.Both);
handler.Close();
}
else
{
Console.WriteLine("Accept failed: {0}", e.SocketError);
}
_acceptDone.Set();
StartAccept();
}
}
class Program
{
static void Main(string[] args)
{
IOCPServer server = new IOCPServer();
server.StartListening(8080);
Console.ReadLine();
}
}
这个示例展示了如何使用IOCP来创建一个简单的异步TCP服务器。请注意,这个示例仅用于演示目的,实际应用中可能需要更复杂的错误处理和资源管理。在实际项目中,你可能还需要考虑使用现有的库和框架,如System.Net.Sockets.TcpListener
和System.Net.Sockets.TcpClient
,它们已经内置了对IOCP的支持。