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  1. //
  2. // detail/std_thread.hpp
  3. // ~~~~~~~~~~~~~~~~~~~~~
  4. //
  5. // Copyright (c) 2003-2019 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_STD_THREAD_HPP
  11. #define ASIO_DETAIL_STD_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_STD_THREAD)
  17. #include <thread>
  18. #include "asio/detail/noncopyable.hpp"
  19. #include "asio/detail/push_options.hpp"
  20. namespace asio {
  21. namespace detail {
  22. class std_thread
  23. : private noncopyable
  24. {
  25. public:
  26. // Constructor.
  27. template <typename Function>
  28. std_thread(Function f, unsigned int = 0)
  29. : thread_(f)
  30. {
  31. }
  32. // Destructor.
  33. ~std_thread()
  34. {
  35. join();
  36. }
  37. // Wait for the thread to exit.
  38. void join()
  39. {
  40. if (thread_.joinable())
  41. thread_.join();
  42. }
  43. // Get number of CPUs.
  44. static std::size_t hardware_concurrency()
  45. {
  46. return std::thread::hardware_concurrency();
  47. }
  48. private:
  49. std::thread thread_;
  50. };
  51. } // namespace detail
  52. } // namespace asio
  53. #include "asio/detail/pop_options.hpp"
  54. #endif // defined(ASIO_HAS_STD_THREAD)
  55. #endif // ASIO_DETAIL_STD_THREAD_HPP