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  1. //
  2. // detail/null_thread.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_THREAD_HPP
  11. #define ASIO_DETAIL_NULL_THREAD_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/throw_error.hpp"
  19. #include "asio/error.hpp"
  20. #include "asio/detail/push_options.hpp"
  21. namespace asio {
  22. namespace detail {
  23. class null_thread
  24. : private noncopyable
  25. {
  26. public:
  27. // Constructor.
  28. template <typename Function>
  29. null_thread(Function, unsigned int = 0)
  30. {
  31. asio::detail::throw_error(
  32. asio::error::operation_not_supported, "thread");
  33. }
  34. // Destructor.
  35. ~null_thread()
  36. {
  37. }
  38. // Wait for the thread to exit.
  39. void join()
  40. {
  41. }
  42. // Get number of CPUs.
  43. static std::size_t hardware_concurrency()
  44. {
  45. return 1;
  46. }
  47. };
  48. } // namespace detail
  49. } // namespace asio
  50. #include "asio/detail/pop_options.hpp"
  51. #endif // !defined(ASIO_HAS_THREADS)
  52. #endif // ASIO_DETAIL_NULL_THREAD_HPP