text: #ifndef BOOST_SMART_PTR_DETAIL_LIGHTWEIGHT_MUTEX_HPP_INCLUDED
  #define BOOST_SMART_PTR_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/smart_ptr/detail/lwm_nop.hpp>
  #elif defined(BOOST_HAS_PTHREADS)
  #  include <boost/smart_ptr/detail/lwm_pthreads.hpp>
  #elif defined(BOOST_HAS_WINTHREADS) || defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
  #  include <boost/smart_ptr/detail/lwm_win32_cs.hpp>
  #else
  // Use #define BOOST_DISABLE_THREADS to avoid the error
  #  error Unrecognized threading platform
  #endif
  
  #endif // #ifndef BOOST_SMART_PTR_DETAIL_LIGHTWEIGHT_MUTEX_HPP_INCLUDED
  