2 // detail/null_static_mutex.hpp
3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5 // Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)
7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
11 #ifndef BOOST_ASIO_DETAIL_NULL_STATIC_MUTEX_HPP
12 #define BOOST_ASIO_DETAIL_NULL_STATIC_MUTEX_HPP
14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
18 #include <boost/asio/detail/config.hpp>
20 #if !defined(BOOST_ASIO_HAS_THREADS)
22 #include <boost/asio/detail/scoped_lock.hpp>
24 #include <boost/asio/detail/push_options.hpp>
30 struct null_static_mutex
32 typedef boost::asio::detail::scoped_lock<null_static_mutex> scoped_lock;
34 // Initialise the mutex.
52 #define BOOST_ASIO_NULL_STATIC_MUTEX_INIT { 0 }
58 #include <boost/asio/detail/pop_options.hpp>
60 #endif // !defined(BOOST_ASIO_HAS_THREADS)
62 #endif // BOOST_ASIO_DETAIL_NULL_STATIC_MUTEX_HPP