A binary compatible 'null' lightweight_mutex for Win32 added.

[SVN r18916]

include/boost/detail/lwm_win32_nt.hpp

@@ -0,0 +1,64 @@
+#ifndef BOOST_DETAIL_LWM_WIN32_NT_HPP_INCLUDED
+#define BOOST_DETAIL_LWM_WIN32_NT_HPP_INCLUDED
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  boost/detail/lwm_win32_nt.hpp
+//
+//  Copyright (c) 2002, 2003 Peter Dimov
+//
+//  Permission to copy, use, modify, sell and distribute this software
+//  is granted provided this copyright notice appears in all copies.
+//  This software is provided "as is" without express or implied
+//  warranty, and with no claim as to its suitability for any purpose.
+//
+//  "No threads" version of lwm_win32.hpp; binary compatible but no-op.
+//
+
+namespace boost
+{
+
+namespace detail
+{
+
+class lightweight_mutex
+{
+private:
+
+    long l_;
+
+    lightweight_mutex(lightweight_mutex const &);
+    lightweight_mutex & operator=(lightweight_mutex const &);
+
+public:
+
+    lightweight_mutex(): l_(0)
+    {
+    }
+
+    class scoped_lock;
+    friend class scoped_lock;
+
+    class scoped_lock
+    {
+    private:
+
+        scoped_lock(scoped_lock const &);
+        scoped_lock & operator=(scoped_lock const &);
+
+    public:
+
+        explicit scoped_lock(lightweight_mutex &)
+        {
+        }
+    };
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif // #ifndef BOOST_DETAIL_LWM_WIN32_NT_HPP_INCLUDED