From b280597c689e5e4ae457d8050cda999b5b93f738 Mon Sep 17 00:00:00 2001
From: Pavel Krymets <pavel@krymets.com>
Date: Thu, 5 Jul 2018 09:01:47 -0700
Subject: [PATCH] fb

---
 .../Core/IISHttpContext.FeatureCollection.cs                    | 1 +
 src/Microsoft.AspNetCore.Server.IIS/Core/IO/AsyncIOEngine.cs    | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Microsoft.AspNetCore.Server.IIS/Core/IISHttpContext.FeatureCollection.cs b/src/Microsoft.AspNetCore.Server.IIS/Core/IISHttpContext.FeatureCollection.cs
index a2cd22d113..4c2d4342b9 100644
--- a/src/Microsoft.AspNetCore.Server.IIS/Core/IISHttpContext.FeatureCollection.cs
+++ b/src/Microsoft.AspNetCore.Server.IIS/Core/IISHttpContext.FeatureCollection.cs
@@ -205,6 +205,7 @@ namespace Microsoft.AspNetCore.Server.IIS.Core
                     return null;
                 }
 
+                // Synchronize access to native methods that might run in parallel with IO loops
                 lock (_contextLock)
                 {
                     return NativeMethods.HttpTryGetServerVariable(_pInProcessHandler, variableName, out var value) ? value : null;
diff --git a/src/Microsoft.AspNetCore.Server.IIS/Core/IO/AsyncIOEngine.cs b/src/Microsoft.AspNetCore.Server.IIS/Core/IO/AsyncIOEngine.cs
index b07d411630..e7a01b331d 100644
--- a/src/Microsoft.AspNetCore.Server.IIS/Core/IO/AsyncIOEngine.cs
+++ b/src/Microsoft.AspNetCore.Server.IIS/Core/IO/AsyncIOEngine.cs
@@ -26,7 +26,7 @@ namespace Microsoft.AspNetCore.Server.IIS.Core.IO
 
         public AsyncIOEngine(object contextSync, IntPtr handler)
         {
-            this._contextSync = contextSync;
+            _contextSync = contextSync;
             _handler = handler;
         }