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

   1 //
   2 // detail/null_thread.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2017 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_NULL_THREAD_HPP
  12 #define BOOST_ASIO_DETAIL_NULL_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_THREADS)
  21
  22 #include <boost/asio/detail/noncopyable.hpp>
  23 #include <boost/asio/detail/throw_error.hpp>
  24 #include <boost/asio/error.hpp>
  25
  26 #include <boost/asio/detail/push_options.hpp>
  27
  28 namespace boost {
  29 namespace asio {
  30 namespace detail {
  31
  32 class null_thread
  33   : private noncopyable
  34 {
  35 public:
  36   // Constructor.
  37   template <typename Function>
  38   null_thread(Function, unsigned int = 0)
  39   {
  40     boost::asio::detail::throw_error(
  41         boost::asio::error::operation_not_supported, "thread");
  42   }
  43
  44   // Destructor.
  45   ~null_thread()
  46   {
  47   }
  48
  49   // Wait for the thread to exit.
  50   void join()
  51   {
  52   }
  53
  54   // Get number of CPUs.
  55   static std::size_t hardware_concurrency()
  56   {
  57     return 1;
  58   }
  59 };
  60
  61 } // namespace detail
  62 } // namespace asio
  63 } // namespace boost
  64
  65 #include <boost/asio/detail/pop_options.hpp>
  66
  67 #endif // !defined(BOOST_ASIO_HAS_THREADS)
  68
  69 #endif // BOOST_ASIO_DETAIL_NULL_THREAD_HPP