possible solution to http://stackoverflow.com/questions/14461044/concurrency-issue-with-aws-simple-email-service-on-mono/14476243 ?

gistfile1.txt

diff --git a/mcs/class/System/System.Net/WebConnection.cs b/mcs/class/System/System.Net/WebConnection.cs
index 4922fb3..bd505f3 100644
--- a/mcs/class/System/System.Net/WebConnection.cs
+++ b/mcs/class/System/System.Net/WebConnection.cs
@@ -58,6 +58,7 @@ namespace System.Net
   	object socketLock = new object ();
 		WebExceptionStatus status;
 		WaitCallback initConn;
+		Action<HttpWebRequest> initConnDelegate;
 		bool keepAlive;
 		byte [] buffer;
 		static AsyncCallback readDoneDelegate = new AsyncCallback (ReadDone);
@@ -109,11 +110,12 @@ namespace System.Net
 			this.sPoint = sPoint;
 			buffer = new byte [4096];
 			Data = new WebConnectionData ();
-			initConn = new WaitCallback (state => {
+			initConnDelegate = state => {
 				try {
 					InitConnection (state);
 				} catch {}
-				});
+			};
+			initConn = new WaitCallback (state => initConnDelegate ((HttpWebRequest)state));
 			queue = group.Queue;
 			abortHelper = new AbortHelper ();
 			abortHelper.Connection = this;
@@ -787,7 +789,12 @@ namespace System.Net
 				if (!busy) {
 					busy = true;
 					status = WebExceptionStatus.Success;
-					ThreadPool.QueueUserWorkItem (initConn, request);
+
+					string managed = Environment.GetEnvironmentVariable ("MONO_DISABLE_WEBCONNECTION_THREADPOOL");
+					if (managed == null)
+						ThreadPool.QueueUserWorkItem (initConn, request);
+					else
+						initConnDelegate(request);
 				} else {
 					lock (queue) {
 #if MONOTOUCH