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//
// win_thread.hpp
// ~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2008 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_WIN_THREAD_HPP
#define BOOST_ASIO_DETAIL_WIN_THREAD_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/push_options.hpp>
#include <boost/asio/detail/push_options.hpp>
#include <boost/config.hpp>
#include <boost/system/system_error.hpp>
#include <boost/asio/detail/pop_options.hpp>
#if defined(BOOST_WINDOWS) && !defined(UNDER_CE)
#include <boost/asio/error.hpp>
#include <boost/asio/detail/noncopyable.hpp>
#include <boost/asio/detail/socket_types.hpp>
#include <boost/asio/detail/push_options.hpp>
#include <boost/throw_exception.hpp>
#include <memory>
#include <process.h>
#include <boost/asio/detail/pop_options.hpp>
namespace boost {
namespace asio {
namespace detail {
unsigned int __stdcall win_thread_function(void* arg);
#if (WINVER < 0x0500)
void __stdcall apc_function(ULONG data);
#else
void __stdcall apc_function(ULONG_PTR data);
#endif
template <typename T>
class win_thread_base
{
public:
static bool terminate_threads()
{
return ::InterlockedExchangeAdd(&terminate_threads_, 0) != 0;
}
static void set_terminate_threads(bool b)
{
::InterlockedExchange(&terminate_threads_, b ? 1 : 0);
}
private:
static long terminate_threads_;
};
template <typename T>
long win_thread_base<T>::terminate_threads_ = 0;
class win_thread
: private noncopyable,
public win_thread_base<win_thread>
{
public:
// Constructor.
template <typename Function>
win_thread(Function f)
: exit_event_(0)
{
std::auto_ptr<func_base> arg(new func<Function>(f));
::HANDLE entry_event = 0;
arg->entry_event_ = entry_event = ::CreateEvent(0, true, false, 0);
if (!entry_event)
{
DWORD last_error = ::GetLastError();
boost::system::system_error e(
boost::system::error_code(last_error,
boost::asio::error::get_system_category()),
"thread.entry_event");
boost::throw_exception(e);
}
arg->exit_event_ = exit_event_ = ::CreateEvent(0, true, false, 0);
if (!exit_event_)
{
DWORD last_error = ::GetLastError();
::CloseHandle(entry_event);
boost::system::system_error e(
boost::system::error_code(last_error,
boost::asio::error::get_system_category()),
"thread.exit_event");
boost::throw_exception(e);
}
unsigned int thread_id = 0;
thread_ = reinterpret_cast<HANDLE>(::_beginthreadex(0, 0,
win_thread_function, arg.get(), 0, &thread_id));
if (!thread_)
{
DWORD last_error = ::GetLastError();
if (entry_event)
::CloseHandle(entry_event);
if (exit_event_)
::CloseHandle(exit_event_);
boost::system::system_error e(
boost::system::error_code(last_error,
boost::asio::error::get_system_category()),
"thread");
boost::throw_exception(e);
}
arg.release();
if (entry_event)
{
::WaitForSingleObject(entry_event, INFINITE);
::CloseHandle(entry_event);
}
}
// Destructor.
~win_thread()
{
::CloseHandle(thread_);
// The exit_event_ handle is deliberately allowed to leak here since it
// is an error for the owner of an internal thread not to join() it.
}
// Wait for the thread to exit.
void join()
{
::WaitForSingleObject(exit_event_, INFINITE);
::CloseHandle(exit_event_);
if (terminate_threads())
{
::TerminateThread(thread_, 0);
}
else
{
::QueueUserAPC(apc_function, thread_, 0);
::WaitForSingleObject(thread_, INFINITE);
}
}
private:
friend unsigned int __stdcall win_thread_function(void* arg);
#if (WINVER < 0x0500)
friend void __stdcall apc_function(ULONG);
#else
friend void __stdcall apc_function(ULONG_PTR);
#endif
class func_base
{
public:
virtual ~func_base() {}
virtual void run() = 0;
::HANDLE entry_event_;
::HANDLE exit_event_;
};
template <typename Function>
class func
: public func_base
{
public:
func(Function f)
: f_(f)
{
}
virtual void run()
{
f_();
}
private:
Function f_;
};
::HANDLE thread_;
::HANDLE exit_event_;
};
inline unsigned int __stdcall win_thread_function(void* arg)
{
std::auto_ptr<win_thread::func_base> func(
static_cast<win_thread::func_base*>(arg));
::SetEvent(func->entry_event_);
func->run();
// Signal that the thread has finished its work, but rather than returning go
// to sleep to put the thread into a well known state. If the thread is being
// joined during global object destruction then it may be killed using
// TerminateThread (to avoid a deadlock in DllMain). Otherwise, the SleepEx
// call will be interrupted using QueueUserAPC and the thread will shut down
// cleanly.
HANDLE exit_event = func->exit_event_;
func.reset();
::SetEvent(exit_event);
::SleepEx(INFINITE, TRUE);
return 0;
}
#if (WINVER < 0x0500)
inline void __stdcall apc_function(ULONG) {}
#else
inline void __stdcall apc_function(ULONG_PTR) {}
#endif
} // namespace detail
} // namespace asio
} // namespace boost
#endif // defined(BOOST_WINDOWS) && !defined(UNDER_CE)
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_DETAIL_WIN_THREAD_HPP
|
Swift