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  1. //
  2. // detail/null_mutex.hpp
  3. // ~~~~~~~~~~~~~~~~~~~~~
  4. //
  5. // Copyright (c) 2003-2015 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 ASIO_DETAIL_NULL_MUTEX_HPP
  11. #define 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 "asio/detail/config.hpp"
  16. #if !defined(ASIO_HAS_THREADS)
  17. #include "asio/detail/noncopyable.hpp"
  18. #include "asio/detail/scoped_lock.hpp"
  19. #include "asio/detail/push_options.hpp"
  20. namespace asio {
  21. namespace detail {
  22. class null_mutex
  23. : private noncopyable
  24. {
  25. public:
  26. typedef asio::detail::scoped_lock<null_mutex> scoped_lock;
  27. // Constructor.
  28. null_mutex()
  29. {
  30. }
  31. // Destructor.
  32. ~null_mutex()
  33. {
  34. }
  35. // Lock the mutex.
  36. void lock()
  37. {
  38. }
  39. // Unlock the mutex.
  40. void unlock()
  41. {
  42. }
  43. };
  44. } // namespace detail
  45. } // namespace asio
  46. #include "asio/detail/pop_options.hpp"
  47. #endif // !defined(ASIO_HAS_THREADS)
  48. #endif // ASIO_DETAIL_NULL_MUTEX_HPP