diff --git a/include/llvm/System/Alarm.h b/include/llvm/System/Alarm.h
index 718ab8f3bb1..9535d23f812 100644
--- a/include/llvm/System/Alarm.h
+++ b/include/llvm/System/Alarm.h
@@ -7,8 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// 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 
+// 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
 //
@@ -20,7 +20,7 @@
 namespace llvm {
 namespace sys {
 
-  /// This function registers an alarm to trigger some number of \p seconds in 
+  /// 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
@@ -31,14 +31,19 @@ namespace sys {
     unsigned seconds ///< Number of seconds in future when alarm arrives
   );
 
-  /// This function terminates the alarm previously set up 
+  /// This function terminates the alarm previously set up
   /// @returns nothing
   void TerminateAlarm();
 
-  /// This function acquires the status of the alarm. 
+  /// 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
 
diff --git a/lib/System/Unix/Alarm.inc b/lib/System/Unix/Alarm.inc
index 7faa6afa9ad..28ff1b8a636 100644
--- a/lib/System/Unix/Alarm.inc
+++ b/lib/System/Unix/Alarm.inc
@@ -66,3 +66,7 @@ int sys::AlarmStatus() {
     return 1;
   return 0;
 }
+
+void Sleep(unsigned n) {
+  ::sleep(n);
+}
diff --git a/lib/System/Win32/Alarm.inc b/lib/System/Win32/Alarm.inc
index 2f1a2808f98..64a2107a8e7 100644
--- a/lib/System/Win32/Alarm.inc
+++ b/lib/System/Win32/Alarm.inc
@@ -34,3 +34,7 @@ int sys::AlarmStatus() {
   // FIXME: Implement for Win32
   return 0;
 }
+
+void Sleep(unsigned n) {
+  Sleep(n*1000);
+}