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70 lines
1.4 KiB
C++
70 lines
1.4 KiB
C++
//
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// detail/null_thread.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_ASIO_DETAIL_NULL_THREAD_HPP
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#define BOOST_ASIO_DETAIL_NULL_THREAD_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include <boost/asio/detail/config.hpp>
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#if !defined(BOOST_ASIO_HAS_THREADS)
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#include <boost/asio/detail/noncopyable.hpp>
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#include <boost/asio/detail/throw_error.hpp>
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#include <boost/asio/error.hpp>
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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namespace asio {
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namespace detail {
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class null_thread
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: private noncopyable
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{
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public:
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// Constructor.
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template <typename Function>
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null_thread(Function, unsigned int = 0)
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{
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boost::asio::detail::throw_error(
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boost::asio::error::operation_not_supported, "thread");
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}
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// Destructor.
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~null_thread()
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{
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}
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// Wait for the thread to exit.
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void join()
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{
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}
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// Get number of CPUs.
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static std::size_t hardware_concurrency()
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{
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return 1;
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}
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};
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} // namespace detail
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#endif // !defined(BOOST_ASIO_HAS_THREADS)
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#endif // BOOST_ASIO_DETAIL_NULL_THREAD_HPP
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