#ifndef BOOST_DETAIL_LWM_IRIX_HPP_INCLUDED#define BOOST_DETAIL_LWM_IRIX_HPP_INCLUDED////  boost/detail/lwm_irix.hpp////  Copyright (c) 2002 Peter Dimov and Multi Media Ltd.//  Copyright (c) 2002 Dan Gohman//// 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)//#include <sgidefs.h>#include <mutex.h>#include <sched.h>namespace boost{namespace detail{class lightweight_mutex{private:    __uint32_t 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:        lightweight_mutex & m_;        scoped_lock(scoped_lock const &);        scoped_lock & operator=(scoped_lock const &);    public:        explicit scoped_lock(lightweight_mutex & m): m_(m)        {            while( test_and_set32(&m_.l_, 1) )            {                sched_yield();            }        }        ~scoped_lock()        {            m_.l_ = 0;        }    };};} // namespace detail} // namespace boost#endif // #ifndef BOOST_DETAIL_LWM_IRIX_HPP_INCLUDED