1 files changed, 21 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Threading/Timeout.cs b/src/mscorlib/src/System/Threading/Timeout.cs
new file mode 100644
index 0000000000..99e24159b2
--- /dev/null
+++ b/src/mscorlib/src/System/Threading/Timeout.cs
@@ -0,0 +1,21 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+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);
+    }
+
+}