Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/mscorlib/system/threading/timeout.cs

@@ -0,0 +1,27 @@
+// ==++==
+// 
+//   Copyright (c) Microsoft Corporation.  All rights reserved.
+// 
+// ==--==
+//
+// <OWNER>[....]</OWNER>
+
+namespace System.Threading {
+    using System.Threading;
+    using System;
+    // A constant used by methods that take a timeout (Object.Wait, Thread.Sleep
+    // etc) to indicate that no timeout should occur.
+    //
+    // <
+
+    [System.Runtime.InteropServices.ComVisible(true)]
+    public static class Timeout
+    {
+        [System.Runtime.InteropServices.ComVisible(false)]
+        public static readonly TimeSpan InfiniteTimeSpan = new TimeSpan(0, 0, 0, 0, Timeout.Infinite);
+
+        public const int Infinite = -1;
+        internal const uint UnsignedInfinite = unchecked((uint)-1);
+    }
+
+}