Asp.net mvc 中处理同一个session的并行请求的问题

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.SessionState;
namespace MvcApplication2.Controllers
{
    public class HomeController : Controller
    {
        //
        // GET: /Home/
        public ActionResult Index()
        {
            return View();
        }
        public ActionResult Test()
        {
            //这里为了测试执行了等待30秒的代码，实际项目中会遇到
            //很多类似需要很长时间的情况,比如调用webservice，或者处理很大数据
            System.Threading.Thread.Sleep(30000);
            return View();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Http;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;

namespace MvcApplication2
{
    // Note: For instructions on enabling IIS6 or IIS7 classic mode, 
    // visit http://go.microsoft.com/?LinkId=9394801

    public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();

            WebApiConfig.Register(GlobalConfiguration.Configuration);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
        }
        protected void Session_Start(object sender, EventArgs e)
        {
        }
    }
}

[SessionState(SessionStateBehavior.ReadOnly)]

[ControllerSessionState(SessionStateBehavior.ReadOnly)]