Condition variable implementation for vista, win7

base/synchronization/lock_impl.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_SYNCHRONIZATION_LOCK_IMPL_H_
 #define BASE_SYNCHRONIZATION_LOCK_IMPL_H_
 #pragma once
 
 #include "build/build_config.h"
 
@@ skipping 27 matching lines @@
   // held by something else, immediately return false.
   bool Try();
 
   // Take the lock, blocking until it is available if necessary.
   void Lock();
 
   // Release the lock.  This must only be called by the lock's holder: after
   // a successful call to Try, or a call to Lock.
   void Unlock();
 
-  // Return the native underlying lock.  Not supported for Windows builds.
+  // Return the native underlying lock.
   // TODO(awalker): refactor lock and condition variables so that this is
   // unnecessary.
-#if !defined(OS_WIN)
   OSLockType* os_lock() { return &os_lock_; }
-#endif
 
  private:
   OSLockType os_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(LockImpl);
 };
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_SYNCHRONIZATION_LOCK_IMPL_H_