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diff --git a/lib/Support/Windows/Watchdog.inc b/lib/Support/Windows/Watchdog.inc
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+//===--- Windows/Watchdog.inc - Windows Watchdog Implementation -*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides the generic Windows implementation of the Watchdog class.
+//
+//===----------------------------------------------------------------------===//
+
+// TODO: implement.
+// Currently this is only used by PrettyStackTrace which is also unimplemented
+// on Windows. Roughly, a Windows implementation would use CreateWaitableTimer
+// and a second thread to run the TimerAPCProc.
+
+namespace llvm {
+ namespace sys {
+ Watchdog::Watchdog(unsigned int seconds) {}
+ Watchdog::~Watchdog() {}
+ }
+}