[Mono-dev] Async IO/Completion ports/threads

[Joe Dluzen]

Hi all,

I was looking at async IO support in Mono, which does seem to use
epoll. I found some sample code at
http://stackoverflow.com/questions/2575404/asynchronous-pages-in-the-asp-net-framework-where-are-the-other-threads-and-how/2576601#2576601,
and it does seem to work under Windows .NET, the number of availableIO
threads is 1 less than maxIO. But under Mono 2.10.3 on Win x64, it has
1 less regular worker threads. Mono 2.10.3 on a Ubuntu 11.04 VM is the
same. A bug? Or should I try something else?

Thanks,
Joe

Slightly modified code:

using System;
using System.IO;
using System.Net;
using System.Threading;

namespace IoCompletionPortTest
{
    class Program
    {
        static WebRequest request;

        static IAsyncResult BeginDownload(object sender, EventArgs e,
AsyncCallback cb, object state)
        {
            request = WebRequest.Create("http://www.google.com");
            return request.BeginGetResponse(cb, state);
        }

        static void Main(string[] args)
        {
            IAsyncResult r = BeginDownload(null, null, (ar) =>
                {
                    int maxWorkers, maxIO, availableWorkers, availableIO;
                    ThreadPool.GetMaxThreads(out maxWorkers, out maxIO);
                    ThreadPool.GetAvailableThreads(out
availableWorkers, out availableIO);
                    string html;
                    using (WebResponse response = request.EndGetResponse(ar))
                    using (StreamReader reader = new
StreamReader(response.GetResponseStream()))
                        html = reader.ReadToEnd();
                    Console.WriteLine("{0} out of {1} workers, {2} out
of {3} IOs", availableWorkers, maxWorkers, availableIO, maxIO);
                }, null);
            Console.ReadLine();
        }
    }
}