1 files changed, 57 insertions, 0 deletions
diff --git a/src/System.Private.CoreLib/shared/Internal/Threading/Tasks/AsyncCausalitySupport.cs b/src/System.Private.CoreLib/shared/Internal/Threading/Tasks/AsyncCausalitySupport.cs
new file mode 100644
index 0000000000..35f4dfe18c
--- /dev/null
+++ b/src/System.Private.CoreLib/shared/Internal/Threading/Tasks/AsyncCausalitySupport.cs
@@ -0,0 +1,57 @@
+// 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.
+
+using System.Threading.Tasks;
+using System.Runtime.CompilerServices;
+
+namespace Internal.Threading.Tasks
+{
+    //
+    // An internal contract that exposes just enough async debugger support needed by the AsTask() extension methods in the WindowsRuntimeSystemExtensions class.
+    //
+    public static class AsyncCausalitySupport
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void AddToActiveTasks(Task task)
+        {
+            if (Task.s_asyncDebuggingEnabled)
+                Task.AddToActiveTasks(task);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void RemoveFromActiveTasks(Task task)
+        {
+            if (Task.s_asyncDebuggingEnabled)
+                Task.RemoveFromActiveTasks(task.Id);
+        }
+
+        public static bool LoggingOn
+        {
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get
+            {
+                return AsyncCausalityTracer.LoggingOn;
+            }
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void TraceOperationCreation(Task task, string operationName)
+        {
+            AsyncCausalityTracer.TraceOperationCreation(CausalityTraceLevel.Required, task.Id, operationName, 0);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void TraceOperationCompletedSuccess(Task task)
+        {
+            AsyncCausalityTracer.TraceOperationCompletion(CausalityTraceLevel.Required, task.Id, AsyncCausalityStatus.Completed);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void TraceOperationCompletedError(Task task)
+        {
+            AsyncCausalityTracer.TraceOperationCompletion(CausalityTraceLevel.Required, task.Id, AsyncCausalityStatus.Error);
+        }
+    }
+}
+