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1 | // |
2 | // detail/signal_handler.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
92f5a8d4 | 5 | // Copyright (c) 2003-2019 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_SIGNAL_HANDLER_HPP | |
12 | #define BOOST_ASIO_DETAIL_SIGNAL_HANDLER_HPP | |
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> | |
b32b8144 | 19 | #include <boost/asio/detail/bind_handler.hpp> |
7c673cae FG |
20 | #include <boost/asio/detail/fenced_block.hpp> |
21 | #include <boost/asio/detail/handler_alloc_helpers.hpp> | |
22 | #include <boost/asio/detail/handler_invoke_helpers.hpp> | |
b32b8144 FG |
23 | #include <boost/asio/detail/handler_work.hpp> |
24 | #include <boost/asio/detail/memory.hpp> | |
7c673cae FG |
25 | #include <boost/asio/detail/signal_op.hpp> |
26 | ||
27 | #include <boost/asio/detail/push_options.hpp> | |
28 | ||
29 | namespace boost { | |
30 | namespace asio { | |
31 | namespace detail { | |
32 | ||
92f5a8d4 | 33 | template <typename Handler, typename IoExecutor> |
7c673cae FG |
34 | class signal_handler : public signal_op |
35 | { | |
36 | public: | |
37 | BOOST_ASIO_DEFINE_HANDLER_PTR(signal_handler); | |
38 | ||
92f5a8d4 | 39 | signal_handler(Handler& h, const IoExecutor& io_ex) |
7c673cae | 40 | : signal_op(&signal_handler::do_complete), |
92f5a8d4 TL |
41 | handler_(BOOST_ASIO_MOVE_CAST(Handler)(h)), |
42 | io_executor_(io_ex) | |
7c673cae | 43 | { |
92f5a8d4 | 44 | handler_work<Handler, IoExecutor>::start(handler_, io_executor_); |
7c673cae FG |
45 | } |
46 | ||
b32b8144 | 47 | static void do_complete(void* owner, operation* base, |
7c673cae FG |
48 | const boost::system::error_code& /*ec*/, |
49 | std::size_t /*bytes_transferred*/) | |
50 | { | |
51 | // Take ownership of the handler object. | |
52 | signal_handler* h(static_cast<signal_handler*>(base)); | |
53 | ptr p = { boost::asio::detail::addressof(h->handler_), h, h }; | |
92f5a8d4 | 54 | handler_work<Handler, IoExecutor> w(h->handler_, h->io_executor_); |
7c673cae | 55 | |
b32b8144 | 56 | BOOST_ASIO_HANDLER_COMPLETION((*h)); |
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57 | |
58 | // Make a copy of the handler so that the memory can be deallocated before | |
59 | // the upcall is made. Even if we're not about to make an upcall, a | |
60 | // sub-object of the handler may be the true owner of the memory associated | |
61 | // with the handler. Consequently, a local copy of the handler is required | |
62 | // to ensure that any owning sub-object remains valid until after we have | |
63 | // deallocated the memory here. | |
64 | detail::binder2<Handler, boost::system::error_code, int> | |
65 | handler(h->handler_, h->ec_, h->signal_number_); | |
66 | p.h = boost::asio::detail::addressof(handler.handler_); | |
67 | p.reset(); | |
68 | ||
69 | // Make the upcall if required. | |
70 | if (owner) | |
71 | { | |
72 | fenced_block b(fenced_block::half); | |
73 | BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); | |
b32b8144 | 74 | w.complete(handler, handler.handler_); |
7c673cae FG |
75 | BOOST_ASIO_HANDLER_INVOCATION_END; |
76 | } | |
77 | } | |
78 | ||
79 | private: | |
80 | Handler handler_; | |
92f5a8d4 | 81 | IoExecutor io_executor_; |
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82 | }; |
83 | ||
84 | } // namespace detail | |
85 | } // namespace asio | |
86 | } // namespace boost | |
87 | ||
88 | #include <boost/asio/detail/pop_options.hpp> | |
89 | ||
90 | #endif // BOOST_ASIO_DETAIL_SIGNAL_HANDLER_HPP |