| // |
| // detail/null_thread.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| // |
| |
| #ifndef ASIO_DETAIL_NULL_THREAD_HPP |
| #define ASIO_DETAIL_NULL_THREAD_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include "asio/detail/config.hpp" |
| |
| #if !defined(ASIO_HAS_THREADS) |
| |
| #include "asio/detail/noncopyable.hpp" |
| #include "asio/detail/throw_error.hpp" |
| #include "asio/error.hpp" |
| |
| #include "asio/detail/push_options.hpp" |
| |
| namespace asio { |
| namespace detail { |
| |
| class null_thread |
| : private noncopyable |
| { |
| public: |
| // Constructor. |
| template <typename Function> |
| null_thread(Function, unsigned int = 0) |
| { |
| asio::detail::throw_error( |
| asio::error::operation_not_supported, "thread"); |
| } |
| |
| // Destructor. |
| ~null_thread() |
| { |
| } |
| |
| // Wait for the thread to exit. |
| void join() |
| { |
| } |
| |
| // Get number of CPUs. |
| static std::size_t hardware_concurrency() |
| { |
| return 1; |
| } |
| }; |
| |
| } // namespace detail |
| } // namespace asio |
| |
| #include "asio/detail/pop_options.hpp" |
| |
| #endif // !defined(ASIO_HAS_THREADS) |
| |
| #endif // ASIO_DETAIL_NULL_THREAD_HPP |