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1 | // |
2 | // detail/wait_handler.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
11fdf7f2 | 5 | // Copyright (c) 2003-2018 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_WAIT_HANDLER_HPP | |
12 | #define BOOST_ASIO_DETAIL_WAIT_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> | |
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19 | #include <boost/asio/detail/fenced_block.hpp> |
20 | #include <boost/asio/detail/handler_alloc_helpers.hpp> | |
21 | #include <boost/asio/detail/handler_invoke_helpers.hpp> | |
b32b8144 | 22 | #include <boost/asio/detail/memory.hpp> |
7c673cae | 23 | #include <boost/asio/detail/wait_op.hpp> |
b32b8144 | 24 | #include <boost/asio/io_context.hpp> |
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25 | |
26 | #include <boost/asio/detail/push_options.hpp> | |
27 | ||
28 | namespace boost { | |
29 | namespace asio { | |
30 | namespace detail { | |
31 | ||
32 | template <typename Handler> | |
33 | class wait_handler : public wait_op | |
34 | { | |
35 | public: | |
36 | BOOST_ASIO_DEFINE_HANDLER_PTR(wait_handler); | |
37 | ||
38 | wait_handler(Handler& h) | |
39 | : wait_op(&wait_handler::do_complete), | |
40 | handler_(BOOST_ASIO_MOVE_CAST(Handler)(h)) | |
41 | { | |
b32b8144 | 42 | handler_work<Handler>::start(handler_); |
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43 | } |
44 | ||
b32b8144 | 45 | static void do_complete(void* owner, operation* base, |
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46 | const boost::system::error_code& /*ec*/, |
47 | std::size_t /*bytes_transferred*/) | |
48 | { | |
49 | // Take ownership of the handler object. | |
50 | wait_handler* h(static_cast<wait_handler*>(base)); | |
51 | ptr p = { boost::asio::detail::addressof(h->handler_), h, h }; | |
b32b8144 | 52 | handler_work<Handler> w(h->handler_); |
7c673cae | 53 | |
b32b8144 | 54 | BOOST_ASIO_HANDLER_COMPLETION((*h)); |
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55 | |
56 | // Make a copy of the handler so that the memory can be deallocated before | |
57 | // the upcall is made. Even if we're not about to make an upcall, a | |
58 | // sub-object of the handler may be the true owner of the memory associated | |
59 | // with the handler. Consequently, a local copy of the handler is required | |
60 | // to ensure that any owning sub-object remains valid until after we have | |
61 | // deallocated the memory here. | |
62 | detail::binder1<Handler, boost::system::error_code> | |
63 | handler(h->handler_, h->ec_); | |
64 | p.h = boost::asio::detail::addressof(handler.handler_); | |
65 | p.reset(); | |
66 | ||
67 | // Make the upcall if required. | |
68 | if (owner) | |
69 | { | |
70 | fenced_block b(fenced_block::half); | |
71 | BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_)); | |
b32b8144 | 72 | w.complete(handler, handler.handler_); |
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73 | BOOST_ASIO_HANDLER_INVOCATION_END; |
74 | } | |
75 | } | |
76 | ||
77 | private: | |
78 | Handler handler_; | |
79 | }; | |
80 | ||
81 | } // namespace detail | |
82 | } // namespace asio | |
83 | } // namespace boost | |
84 | ||
85 | #include <boost/asio/detail/pop_options.hpp> | |
86 | ||
87 | #endif // BOOST_ASIO_DETAIL_WAIT_HANDLER_HPP |