ceph/src/boost/boost/asio/detail/std_thread.hpp

   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
  11 #ifndef BOOST_ASIO_DETAIL_STD_THREAD_HPP
  12 #define BOOST_ASIO_DETAIL_STD_THREAD_HPP
  13
  14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  15 # pragma once
  16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  17
  18 #include <boost/asio/detail/config.hpp>
  19
  20 #if defined(BOOST_ASIO_HAS_STD_THREAD)
  21
  22 #include <thread>
  23 #include <boost/asio/detail/noncopyable.hpp>
  24
  25 #include <boost/asio/detail/push_options.hpp>
  26
  27 namespace boost {
  28 namespace asio {
  29 namespace detail {
  30
  31 class std_thread
  32   : private noncopyable
  33 {
  34 public:
  35   // Constructor.
  36   template <typename Function>
  37   std_thread(Function f, unsigned int = 0)
  38     : thread_(f)
  39   {
  40   }
  41
  42   // Destructor.
  43   ~std_thread()
  44   {
  45     join();
  46   }
  47
  48   // Wait for the thread to exit.
  49   void join()
  50   {
  51     if (thread_.joinable())
  52       thread_.join();
  53   }
  54
  55   // Get number of CPUs.
  56   static std::size_t hardware_concurrency()
  57   {
  58     return std::thread::hardware_concurrency();
  59   }
  60
  61 private:
  62   std::thread thread_;
  63 };
  64
  65 } // namespace detail
  66 } // namespace asio
  67 } // namespace boost
  68
  69 #include <boost/asio/detail/pop_options.hpp>
  70
  71 #endif // defined(BOOST_ASIO_HAS_STD_THREAD)
  72
  73 #endif // BOOST_ASIO_DETAIL_STD_THREAD_HPP