#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_NT_HPP_INCLUDED #define BOOST_SMART_PTR_DETAIL_SPINLOCK_NT_HPP_INCLUDED // MS compatible compilers support #pragma once #if defined(_MSC_VER) && (_MSC_VER >= 1020) # pragma once #endif // // Copyright (c) 2008 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) // #include <boost/assert.hpp> namespace boost { namespace detail { class spinlock { public: bool locked_; public: inline bool try_lock() { if( locked_ ) { return false; } else { locked_ = true; return true; } } inline void lock() { BOOST_ASSERT( !locked_ ); locked_ = true; } inline void unlock() { BOOST_ASSERT( locked_ ); locked_ = false; } public: class scoped_lock { private: spinlock & sp_; scoped_lock( scoped_lock const & ); scoped_lock & operator=( scoped_lock const & ); public: explicit scoped_lock( spinlock & sp ): sp_( sp ) { sp.lock(); } ~scoped_lock() { sp_.unlock(); } }; }; } // namespace detail } // namespace boost #define BOOST_DETAIL_SPINLOCK_INIT { false } #endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_NT_HPP_INCLUDED