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7c673cae FG |
1 | // |
2 | // detail/impl/win_thread.ipp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
f67539c2 | 5 | // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
7c673cae FG |
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 | ||
31 | namespace boost { | |
32 | namespace asio { | |
33 | namespace detail { | |
34 | ||
35 | win_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 | ||
43 | void 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 | ||
b32b8144 FG |
59 | std::size_t win_thread::hardware_concurrency() |
60 | { | |
61 | SYSTEM_INFO system_info; | |
62 | ::GetSystemInfo(&system_info); | |
63 | return system_info.dwNumberOfProcessors; | |
64 | } | |
65 | ||
7c673cae FG |
66 | void win_thread::start_thread(func_base* arg, unsigned int stack_size) |
67 | { | |
68 | ::HANDLE entry_event = 0; | |
69 | arg->entry_event_ = entry_event = ::CreateEventW(0, true, false, 0); | |
70 | if (!entry_event) | |
71 | { | |
72 | DWORD last_error = ::GetLastError(); | |
73 | delete arg; | |
74 | boost::system::error_code ec(last_error, | |
75 | boost::asio::error::get_system_category()); | |
76 | boost::asio::detail::throw_error(ec, "thread.entry_event"); | |
77 | } | |
78 | ||
79 | arg->exit_event_ = exit_event_ = ::CreateEventW(0, true, false, 0); | |
80 | if (!exit_event_) | |
81 | { | |
82 | DWORD last_error = ::GetLastError(); | |
83 | delete arg; | |
84 | boost::system::error_code ec(last_error, | |
85 | boost::asio::error::get_system_category()); | |
86 | boost::asio::detail::throw_error(ec, "thread.exit_event"); | |
87 | } | |
88 | ||
89 | unsigned int thread_id = 0; | |
90 | thread_ = reinterpret_cast<HANDLE>(::_beginthreadex(0, | |
91 | stack_size, win_thread_function, arg, 0, &thread_id)); | |
92 | if (!thread_) | |
93 | { | |
94 | DWORD last_error = ::GetLastError(); | |
95 | delete arg; | |
96 | if (entry_event) | |
97 | ::CloseHandle(entry_event); | |
98 | if (exit_event_) | |
99 | ::CloseHandle(exit_event_); | |
100 | boost::system::error_code ec(last_error, | |
101 | boost::asio::error::get_system_category()); | |
102 | boost::asio::detail::throw_error(ec, "thread"); | |
103 | } | |
104 | ||
105 | if (entry_event) | |
106 | { | |
107 | ::WaitForSingleObject(entry_event, INFINITE); | |
108 | ::CloseHandle(entry_event); | |
109 | } | |
110 | } | |
111 | ||
112 | unsigned int __stdcall win_thread_function(void* arg) | |
113 | { | |
114 | win_thread::auto_func_base_ptr func = { | |
115 | static_cast<win_thread::func_base*>(arg) }; | |
116 | ||
117 | ::SetEvent(func.ptr->entry_event_); | |
118 | ||
119 | func.ptr->run(); | |
120 | ||
121 | // Signal that the thread has finished its work, but rather than returning go | |
122 | // to sleep to put the thread into a well known state. If the thread is being | |
123 | // joined during global object destruction then it may be killed using | |
124 | // TerminateThread (to avoid a deadlock in DllMain). Otherwise, the SleepEx | |
125 | // call will be interrupted using QueueUserAPC and the thread will shut down | |
126 | // cleanly. | |
127 | HANDLE exit_event = func.ptr->exit_event_; | |
128 | delete func.ptr; | |
129 | func.ptr = 0; | |
130 | ::SetEvent(exit_event); | |
131 | ::SleepEx(INFINITE, TRUE); | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
136 | #if defined(WINVER) && (WINVER < 0x0500) | |
137 | void __stdcall apc_function(ULONG) {} | |
138 | #else | |
139 | void __stdcall apc_function(ULONG_PTR) {} | |
140 | #endif | |
141 | ||
142 | } // namespace detail | |
143 | } // namespace asio | |
144 | } // namespace boost | |
145 | ||
146 | #include <boost/asio/detail/pop_options.hpp> | |
147 | ||
148 | #endif // defined(BOOST_ASIO_WINDOWS) | |
149 | // && !defined(BOOST_ASIO_WINDOWS_APP) | |
150 | // && !defined(UNDER_CE) | |
151 | ||
152 | #endif // BOOST_ASIO_DETAIL_IMPL_WIN_THREAD_IPP |