ext-boost/boost/asio/detail/winapp_thread.hpp
2019-08-24 15:39:04 +02:00

127 lines
2.7 KiB
C++

//
// detail/winapp_thread.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2019 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 BOOST_ASIO_DETAIL_WINAPP_THREAD_HPP
#define BOOST_ASIO_DETAIL_WINAPP_THREAD_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#if defined(BOOST_ASIO_WINDOWS) && defined(BOOST_ASIO_WINDOWS_APP)
#include <boost/asio/detail/noncopyable.hpp>
#include <boost/asio/detail/scoped_ptr.hpp>
#include <boost/asio/detail/socket_types.hpp>
#include <boost/asio/detail/throw_error.hpp>
#include <boost/asio/error.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
DWORD WINAPI winapp_thread_function(LPVOID arg);
class winapp_thread
: private noncopyable
{
public:
// Constructor.
template <typename Function>
winapp_thread(Function f, unsigned int = 0)
{
scoped_ptr<func_base> arg(new func<Function>(f));
DWORD thread_id = 0;
thread_ = ::CreateThread(0, 0, winapp_thread_function,
arg.get(), 0, &thread_id);
if (!thread_)
{
DWORD last_error = ::GetLastError();
boost::system::error_code ec(last_error,
boost::asio::error::get_system_category());
boost::asio::detail::throw_error(ec, "thread");
}
arg.release();
}
// Destructor.
~winapp_thread()
{
::CloseHandle(thread_);
}
// Wait for the thread to exit.
void join()
{
::WaitForSingleObjectEx(thread_, INFINITE, false);
}
// Get number of CPUs.
static std::size_t hardware_concurrency()
{
SYSTEM_INFO system_info;
::GetNativeSystemInfo(&system_info);
return system_info.dwNumberOfProcessors;
}
private:
friend DWORD WINAPI winapp_thread_function(LPVOID arg);
class func_base
{
public:
virtual ~func_base() {}
virtual void run() = 0;
};
template <typename Function>
class func
: public func_base
{
public:
func(Function f)
: f_(f)
{
}
virtual void run()
{
f_();
}
private:
Function f_;
};
::HANDLE thread_;
};
inline DWORD WINAPI winapp_thread_function(LPVOID arg)
{
scoped_ptr<winapp_thread::func_base> func(
static_cast<winapp_thread::func_base*>(arg));
func->run();
return 0;
}
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // defined(BOOST_ASIO_WINDOWS) && defined(BOOST_ASIO_WINDOWS_APP)
#endif // BOOST_ASIO_DETAIL_WINAPP_THREAD_HPP