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diff --git a/include/llvm/System/Alarm.h b/include/llvm/System/Alarm.h
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+//===- llvm/System/Alarm.h - Alarm Generation support  ----------*- 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 an operating system independent interface to alarm(2)
+// type functionality. The Alarm class allows a one-shot alarm to be set up
+// at some number of seconds in the future. When the alarm triggers, a method
+// is called to process the event
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_ALARM_H
+#define LLVM_SYSTEM_ALARM_H
+
+namespace llvm {
+namespace sys {
+
+  /// This function registers an alarm to trigger some number of \p seconds in
+  /// the future. When that time arrives, the AlarmStatus function will begin
+  /// to return 1 instead of 0. The user must poll the status of the alarm by
+  /// making occasional calls to AlarmStatus. If the user sends an interrupt
+  /// signal, AlarmStatus will begin returning -1, even if the alarm event
+  /// occurred.
+  /// @returns nothing
+  void SetupAlarm(
+    unsigned seconds ///< Number of seconds in future when alarm arrives
+  );
+
+  /// This function terminates the alarm previously set up
+  /// @returns nothing
+  void TerminateAlarm();
+
+  /// This function acquires the status of the alarm.
+  /// @returns -1=cancelled, 0=untriggered, 1=triggered
+  int AlarmStatus();
+
+  /// Sleep for n seconds.
+  /// @returns nothing.
+  void Sleep(unsigned n);
+
+
+} // End sys namespace
+} // End llvm namespace
+
+#endif