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+#ifndef BOOST_SMART_PTR_DETAIL_LWM_WIN32_CS_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_LWM_WIN32_CS_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+// boost/detail/lwm_win32_cs.hpp
+//
+// Copyright (c) 2002, 2003 Peter Dimov
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifdef BOOST_USE_WINDOWS_H
+# include <windows.h>
+#endif
+
+namespace cutl_details_boost
+{
+
+namespace detail
+{
+
+#ifndef BOOST_USE_WINDOWS_H
+
+struct critical_section
+{
+ struct critical_section_debug * DebugInfo;
+ long LockCount;
+ long RecursionCount;
+ void * OwningThread;
+ void * LockSemaphore;
+#if defined(_WIN64)
+ unsigned __int64 SpinCount;
+#else
+ unsigned long SpinCount;
+#endif
+};
+
+extern "C" __declspec(dllimport) void __stdcall InitializeCriticalSection(critical_section *);
+extern "C" __declspec(dllimport) void __stdcall EnterCriticalSection(critical_section *);
+extern "C" __declspec(dllimport) void __stdcall LeaveCriticalSection(critical_section *);
+extern "C" __declspec(dllimport) void __stdcall DeleteCriticalSection(critical_section *);
+
+#else
+
+typedef ::CRITICAL_SECTION critical_section;
+
+#endif // #ifndef BOOST_USE_WINDOWS_H
+
+class lightweight_mutex
+{
+private:
+
+ critical_section cs_;
+
+ lightweight_mutex(lightweight_mutex const &);
+ lightweight_mutex & operator=(lightweight_mutex const &);
+
+public:
+
+ lightweight_mutex()
+ {
+ InitializeCriticalSection(&cs_);
+ }
+
+ ~lightweight_mutex()
+ {
+ DeleteCriticalSection(&cs_);
+ }
+
+ class scoped_lock;
+ friend class scoped_lock;
+
+ class scoped_lock
+ {
+ private:
+
+ lightweight_mutex & m_;
+
+ scoped_lock(scoped_lock const &);
+ scoped_lock & operator=(scoped_lock const &);
+
+ public:
+
+ explicit scoped_lock(lightweight_mutex & m): m_(m)
+ {
+ EnterCriticalSection(&m_.cs_);
+ }
+
+ ~scoped_lock()
+ {
+ LeaveCriticalSection(&m_.cs_);
+ }
+ };
+};
+
+} // namespace detail
+
+} // namespace cutl_details_boost
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_LWM_WIN32_CS_HPP_INCLUDED