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diff --git a/src/system_wrappers/source/condition_variable_win.h b/src/system_wrappers/source/condition_variable_win.h
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+++ b/src/system_wrappers/source/condition_variable_win.h
@@ -0,0 +1,67 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_CONDITION_VARIABLE_WINDOWS_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_CONDITION_VARIABLE_WINDOWS_H_
+
+#include "condition_variable_wrapper.h"
+
+#include <windows.h>
+
+namespace webrtc {
+#if !defined CONDITION_VARIABLE_INIT
+    typedef struct _RTL_CONDITION_VARIABLE
+    {
+        void* Ptr;
+    } RTL_CONDITION_VARIABLE, *PRTL_CONDITION_VARIABLE;
+
+    typedef RTL_CONDITION_VARIABLE CONDITION_VARIABLE, *PCONDITION_VARIABLE;
+#endif
+
+typedef void (WINAPI *PInitializeConditionVariable)(PCONDITION_VARIABLE);
+typedef BOOL (WINAPI *PSleepConditionVariableCS)(PCONDITION_VARIABLE,
+                                                 PCRITICAL_SECTION, DWORD);
+typedef void (WINAPI *PWakeConditionVariable)(PCONDITION_VARIABLE);
+typedef void (WINAPI *PWakeAllConditionVariable)(PCONDITION_VARIABLE);
+
+
+class ConditionVariableWindows : public ConditionVariableWrapper
+{
+public:
+    ConditionVariableWindows();
+    ~ConditionVariableWindows();
+
+    void SleepCS(CriticalSectionWrapper& critSect);
+    bool SleepCS(CriticalSectionWrapper& critSect, unsigned long maxTimeInMS);
+    void Wake();
+    void WakeAll();
+
+private:
+    enum EventWakeUpType
+    {
+        WAKEALL_0   = 0,
+        WAKEALL_1   = 1,
+        WAKE        = 2,
+        EVENT_COUNT = 3
+    };
+
+private:
+    // Native support for Windows Vista+
+    static bool              _winSupportConditionVariablesPrimitive;
+    CONDITION_VARIABLE       _conditionVariable;
+
+    unsigned int     _numWaiters[2];
+    EventWakeUpType  _eventID;
+    CRITICAL_SECTION _numWaitersCritSect;
+    HANDLE           _events[EVENT_COUNT];
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_CONDITION_VARIABLE_WINDOWS_H_