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1//
2// detail/impl/win_thread.ipp
3// ~~~~~~~~~~~~~~~~~~~~~~~~~~
4//
5// Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
6//
7// Distributed under the Boost Software License, Version 1.0. (See accompanying
8// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9//
10
11#ifndef BOOST_ASIO_DETAIL_IMPL_WIN_THREAD_IPP
12#define BOOST_ASIO_DETAIL_IMPL_WIN_THREAD_IPP
13
14#if defined(_MSC_VER) && (_MSC_VER >= 1200)
15# pragma once
16#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
17
18#include <boost/asio/detail/config.hpp>
19
20#if defined(BOOST_ASIO_WINDOWS) \
21 && !defined(BOOST_ASIO_WINDOWS_APP) \
22 && !defined(UNDER_CE)
23
24#include <process.h>
25#include <boost/asio/detail/throw_error.hpp>
26#include <boost/asio/detail/win_thread.hpp>
27#include <boost/asio/error.hpp>
28
29#include <boost/asio/detail/push_options.hpp>
30
31namespace boost {
32namespace asio {
33namespace detail {
34
35win_thread::~win_thread()
36{
37 ::CloseHandle(thread_);
38
39 // The exit_event_ handle is deliberately allowed to leak here since it
40 // is an error for the owner of an internal thread not to join() it.
41}
42
43void win_thread::join()
44{
45 HANDLE handles[2] = { exit_event_, thread_ };
46 ::WaitForMultipleObjects(2, handles, FALSE, INFINITE);
47 ::CloseHandle(exit_event_);
48 if (terminate_threads())
49 {
50 ::TerminateThread(thread_, 0);
51 }
52 else
53 {
54 ::QueueUserAPC(apc_function, thread_, 0);
55 ::WaitForSingleObject(thread_, INFINITE);
56 }
57}
58
59void win_thread::start_thread(func_base* arg, unsigned int stack_size)
60{
61 ::HANDLE entry_event = 0;
62 arg->entry_event_ = entry_event = ::CreateEventW(0, true, false, 0);
63 if (!entry_event)
64 {
65 DWORD last_error = ::GetLastError();
66 delete arg;
67 boost::system::error_code ec(last_error,
68 boost::asio::error::get_system_category());
69 boost::asio::detail::throw_error(ec, "thread.entry_event");
70 }
71
72 arg->exit_event_ = exit_event_ = ::CreateEventW(0, true, false, 0);
73 if (!exit_event_)
74 {
75 DWORD last_error = ::GetLastError();
76 delete arg;
77 boost::system::error_code ec(last_error,
78 boost::asio::error::get_system_category());
79 boost::asio::detail::throw_error(ec, "thread.exit_event");
80 }
81
82 unsigned int thread_id = 0;
83 thread_ = reinterpret_cast<HANDLE>(::_beginthreadex(0,
84 stack_size, win_thread_function, arg, 0, &thread_id));
85 if (!thread_)
86 {
87 DWORD last_error = ::GetLastError();
88 delete arg;
89 if (entry_event)
90 ::CloseHandle(entry_event);
91 if (exit_event_)
92 ::CloseHandle(exit_event_);
93 boost::system::error_code ec(last_error,
94 boost::asio::error::get_system_category());
95 boost::asio::detail::throw_error(ec, "thread");
96 }
97
98 if (entry_event)
99 {
100 ::WaitForSingleObject(entry_event, INFINITE);
101 ::CloseHandle(entry_event);
102 }
103}
104
105unsigned int __stdcall win_thread_function(void* arg)
106{
107 win_thread::auto_func_base_ptr func = {
108 static_cast<win_thread::func_base*>(arg) };
109
110 ::SetEvent(func.ptr->entry_event_);
111
112 func.ptr->run();
113
114 // Signal that the thread has finished its work, but rather than returning go
115 // to sleep to put the thread into a well known state. If the thread is being
116 // joined during global object destruction then it may be killed using
117 // TerminateThread (to avoid a deadlock in DllMain). Otherwise, the SleepEx
118 // call will be interrupted using QueueUserAPC and the thread will shut down
119 // cleanly.
120 HANDLE exit_event = func.ptr->exit_event_;
121 delete func.ptr;
122 func.ptr = 0;
123 ::SetEvent(exit_event);
124 ::SleepEx(INFINITE, TRUE);
125
126 return 0;
127}
128
129#if defined(WINVER) && (WINVER < 0x0500)
130void __stdcall apc_function(ULONG) {}
131#else
132void __stdcall apc_function(ULONG_PTR) {}
133#endif
134
135} // namespace detail
136} // namespace asio
137} // namespace boost
138
139#include <boost/asio/detail/pop_options.hpp>
140
141#endif // defined(BOOST_ASIO_WINDOWS)
142 // && !defined(BOOST_ASIO_WINDOWS_APP)
143 // && !defined(UNDER_CE)
144
145#endif // BOOST_ASIO_DETAIL_IMPL_WIN_THREAD_IPP