125 lines
2.5 KiB
C++
125 lines
2.5 KiB
C++
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//
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// detail/winapp_thread.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 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 ASIO_DETAIL_WINAPP_THREAD_HPP
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#define ASIO_DETAIL_WINAPP_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 "asio/detail/config.hpp"
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#if defined(ASIO_WINDOWS) && defined(ASIO_WINDOWS_APP)
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#include "asio/detail/noncopyable.hpp"
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#include "asio/detail/scoped_ptr.hpp"
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#include "asio/detail/socket_types.hpp"
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#include "asio/detail/throw_error.hpp"
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#include "asio/error.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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DWORD WINAPI winapp_thread_function(LPVOID arg);
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class winapp_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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winapp_thread(Function f, unsigned int = 0)
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{
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scoped_ptr<func_base> arg(new func<Function>(f));
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DWORD thread_id = 0;
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thread_ = ::CreateThread(0, 0, winapp_thread_function,
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arg.get(), 0, &thread_id);
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if (!thread_)
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{
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DWORD last_error = ::GetLastError();
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asio::error_code ec(last_error,
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asio::error::get_system_category());
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asio::detail::throw_error(ec, "thread");
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}
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arg.release();
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}
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// Destructor.
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~winapp_thread()
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{
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::CloseHandle(thread_);
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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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::WaitForSingleObjectEx(thread_, INFINITE, false);
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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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SYSTEM_INFO system_info;
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::GetNativeSystemInfo(&system_info);
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return system_info.dwNumberOfProcessors;
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}
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private:
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friend DWORD WINAPI winapp_thread_function(LPVOID arg);
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class func_base
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{
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public:
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virtual ~func_base() {}
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virtual void run() = 0;
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};
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template <typename Function>
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class func
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: public func_base
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{
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public:
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func(Function f)
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: f_(f)
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{
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}
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virtual void run()
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{
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f_();
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}
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private:
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Function f_;
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};
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::HANDLE thread_;
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};
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inline DWORD WINAPI winapp_thread_function(LPVOID arg)
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{
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scoped_ptr<winapp_thread::func_base> func(
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static_cast<winapp_thread::func_base*>(arg));
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func->run();
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return 0;
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}
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // defined(ASIO_WINDOWS) && defined(ASIO_WINDOWS_APP)
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#endif // ASIO_DETAIL_WINAPP_THREAD_HPP
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