HttpListenerSession.cs

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using System.Runtime.InteropServices;
using System.Threading;
 
namespace System.Net;
 
internal sealed class HttpListenerSession
{
    public readonly HttpListener Listener;
 
    public readonly SafeHandle RequestQueueHandle;
 
    private ThreadPoolBoundHandle _requestQueueBoundHandle;
 
    public ThreadPoolBoundHandle RequestQueueBoundHandle
    {
        get
        {
            if (_requestQueueBoundHandle == null)
            {
                lock (this)
                {
                    if (_requestQueueBoundHandle == null)
                    {
                        _requestQueueBoundHandle = ThreadPoolBoundHandle.BindHandle(RequestQueueHandle);
                        if (System.Net.NetEventSource.Log.IsEnabled())
                        {
                            System.Net.NetEventSource.Info($"ThreadPoolBoundHandle.BindHandle({RequestQueueHandle}) -> {_requestQueueBoundHandle}", null, "RequestQueueBoundHandle");
                        }
                    }
                }
            }
            return _requestQueueBoundHandle;
        }
    }
 
    public unsafe HttpListenerSession(HttpListener listener)
    {
        Listener = listener;
        HttpRequestQueueV2Handle pReqQueueHandle;
        uint num = global::Interop.HttpApi.HttpCreateRequestQueue(global::Interop.HttpApi.s_version, null, null, 0u, out pReqQueueHandle);
        if (num != 0)
        {
            throw new HttpListenerException((int)num);
        }
        if (HttpListener.SkipIOCPCallbackOnSuccess && !global::Interop.Kernel32.SetFileCompletionNotificationModes(pReqQueueHandle, global::Interop.Kernel32.FileCompletionNotificationModes.SkipCompletionPortOnSuccess | global::Interop.Kernel32.FileCompletionNotificationModes.SkipSetEventOnHandle))
        {
            throw new HttpListenerException(Marshal.GetLastPInvokeError());
        }
        RequestQueueHandle = pReqQueueHandle;
    }
 
    public unsafe void CloseRequestQueueHandle()
    {
        lock (this)
        {
            if (!RequestQueueHandle.IsInvalid)
            {
                if (System.Net.NetEventSource.Log.IsEnabled())
                {
                    System.Net.NetEventSource.Info($"Dispose ThreadPoolBoundHandle: {_requestQueueBoundHandle}", null, "CloseRequestQueueHandle");
                }
                _requestQueueBoundHandle?.Dispose();
                RequestQueueHandle.Dispose();
                try
                {
                    global::Interop.Kernel32.CancelIoEx(RequestQueueHandle, null);
                    return;
                }
                catch (ObjectDisposedException)
                {
                    return;
                }
            }
        }
    }
}