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diff --git a/src/inc/apithreadstress.h b/src/inc/apithreadstress.h
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+// 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.
+// ---------------------------------------------------------------------------
+// APIThreadStress.h  (API thread stresser)
+// ---------------------------------------------------------------------------
+
+// ---------------------------------------------------------------------------
+// This class provides a simple base to wrap "thread stress" logic around an API,
+// which will (in thread stress mode) cause an API to "fork" onto many threads
+// executing the same operation simulatenously.  This can help to expose race
+// conditions.
+//
+// Usage:
+//
+// First, subtype APIThreadStress and override Invoke to implement the operation.
+// You will likely need to add data members for the arguments.
+//
+// Next, inside the API, write code like this:
+//
+// void MyRoutine(int a1, void *a2)
+// {
+//      class stress : APIThreadStress
+//      {
+//          int a1;
+//          void *a2;
+//          stress(int a1, void *a2) : a1(a1), a2(a2) 
+//               { DoThreadStress(); }
+//          void Invoke() { MyRoutine(a1, a2); }
+//      } ts (a1, a2);
+//
+//      // implementation
+//
+//      // perhaps we have a common sub-point in the routine where we want the threads to 
+//      // queue up and race again
+//
+//      ts.SyncThreadStress();
+//
+//      // more implementation    
+//  }
+// ---------------------------------------------------------------------------
+
+
+#ifndef _APITHREADSTRESS_H_
+#define _APITHREADSTRESS_H_
+
+#include "utilcode.h"
+
+#ifdef STRESS_THREAD
+
+class APIThreadStress
+{
+ public:
+    APIThreadStress();
+    ~APIThreadStress();
+
+    BOOL DoThreadStress();
+    static void SyncThreadStress();
+
+    static void SetThreadStressCount(int count);
+
+ protected:
+    virtual void Invoke() {LIMITED_METHOD_CONTRACT;};
+
+ private:
+    static DWORD WINAPI StartThread(void *arg);
+
+    static int s_threadStressCount;     
+
+    int       m_threadCount;
+    HANDLE    *m_hThreadArray;
+    BOOL      m_setupOK;
+    LONG      m_runCount;
+    HANDLE    m_syncEvent;
+
+};
+
+#else // STRESS_THREAD
+
+class APIThreadStress
+{
+ public:
+    BOOL DoThreadStress() { return FALSE; }
+    static void SyncThreadStress() { }
+    static void SetThreadStressCount(int count) { }
+};
+
+#endif // STRESS_THREAD
+
+#endif  // _APITHREADSTRESS_H_