null_static_mutex.hpp 1.2 KB

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  1. //
  2. // detail/null_static_mutex.hpp
  3. // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  4. //
  5. // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
  6. //
  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)
  9. //
  10. #ifndef BOOST_ASIO_DETAIL_NULL_STATIC_MUTEX_HPP
  11. #define BOOST_ASIO_DETAIL_NULL_STATIC_MUTEX_HPP
  12. #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  13. # pragma once
  14. #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  15. #include <boost/asio/detail/config.hpp>
  16. #if !defined(BOOST_ASIO_HAS_THREADS)
  17. #include <boost/asio/detail/scoped_lock.hpp>
  18. #include <boost/asio/detail/push_options.hpp>
  19. namespace boost {
  20. namespace asio {
  21. namespace detail {
  22. struct null_static_mutex
  23. {
  24. typedef boost::asio::detail::scoped_lock<null_static_mutex> scoped_lock;
  25. // Initialise the mutex.
  26. void init()
  27. {
  28. }
  29. // Lock the mutex.
  30. void lock()
  31. {
  32. }
  33. // Unlock the mutex.
  34. void unlock()
  35. {
  36. }
  37. int unused_;
  38. };
  39. #define BOOST_ASIO_NULL_STATIC_MUTEX_INIT { 0 }
  40. } // namespace detail
  41. } // namespace asio
  42. } // namespace boost
  43. #include <boost/asio/detail/pop_options.hpp>
  44. #endif // !defined(BOOST_ASIO_HAS_THREADS)
  45. #endif // BOOST_ASIO_DETAIL_NULL_STATIC_MUTEX_HPP