#ifndef BOOST_DETAIL_LIGHTWEIGHT_MUTEX_HPP_INCLUDED

 #define BOOST_DETAIL_LIGHTWEIGHT_MUTEX_HPP_INCLUDED

 // MS compatible compilers support #pragma once

 #if defined(_MSC_VER) && (_MSC_VER >= 1020)

 # pragma once

 #endif

 //

 //  boost/detail/lightweight_mutex.hpp - lightweight mutex

 //

 //  Copyright (c) 2002, 2003 Peter Dimov and Multi Media Ltd.

 //

 // 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)

 //

 //  typedef <unspecified> boost::detail::lightweight_mutex;

 //

 //  boost::detail::lightweight_mutex is a header-only implementation of

 //  a subset of the Mutex concept requirements:

 //

 //  http://www.boost.org/doc/html/threads/concepts.html#threads.concepts.Mutex

 //

 //  It maps to a CRITICAL_SECTION on Windows or a pthread_mutex on POSIX.

 //

 #include <boost/config.hpp>

 #if !defined(BOOST_HAS_THREADS)

 # include <boost/detail/lwm_nop.hpp>

 #elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__)

 #  include <boost/detail/lwm_win32_cs.hpp>

 #elif defined(BOOST_HAS_PTHREADS)

 #  include <boost/detail/lwm_pthreads.hpp>

 #else

 // Use #define BOOST_DISABLE_THREADS to avoid the error

 #  error Unrecognized threading platform

 #endif

 #endif // #ifndef BOOST_DETAIL_LIGHTWEIGHT_MUTEX_HPP_INCLUDED