1 //
2 // detail/std_thread.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 
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>
std_thread(Function f,unsigned int=0)37   std_thread(Function f, unsigned int = 0)
38     : thread_(f)
39   {
40   }
41 
42   // Destructor.
~std_thread()43   ~std_thread()
44   {
45     join();
46   }
47 
48   // Wait for the thread to exit.
join()49   void join()
50   {
51     if (thread_.joinable())
52       thread_.join();
53   }
54 
55   // Get number of CPUs.
hardware_concurrency()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
74