null_mutex.hpp 1.2 KB

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  1. //
  2. // detail/null_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_MUTEX_HPP
  11. #define BOOST_ASIO_DETAIL_NULL_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/noncopyable.hpp>
  18. #include <boost/asio/detail/scoped_lock.hpp>
  19. #include <boost/asio/detail/push_options.hpp>
  20. namespace boost {
  21. namespace asio {
  22. namespace detail {
  23. class null_mutex
  24. : private noncopyable
  25. {
  26. public:
  27. typedef boost::asio::detail::scoped_lock<null_mutex> scoped_lock;
  28. // Constructor.
  29. null_mutex()
  30. {
  31. }
  32. // Destructor.
  33. ~null_mutex()
  34. {
  35. }
  36. // Lock the mutex.
  37. void lock()
  38. {
  39. }
  40. // Unlock the mutex.
  41. void unlock()
  42. {
  43. }
  44. };
  45. } // namespace detail
  46. } // namespace asio
  47. } // namespace boost
  48. #include <boost/asio/detail/pop_options.hpp>
  49. #endif // !defined(BOOST_ASIO_HAS_THREADS)
  50. #endif // BOOST_ASIO_DETAIL_NULL_MUTEX_HPP