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1 | // |
2 | // detail/reactive_null_buffers_op.hpp | |
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_REACTIVE_NULL_BUFFERS_OP_HPP | |
12 | #define BOOST_ASIO_DETAIL_REACTIVE_NULL_BUFFERS_OP_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> | |
20effc67 | 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> | |
20effc67 | 23 | #include <boost/asio/detail/handler_work.hpp> |
b32b8144 | 24 | #include <boost/asio/detail/memory.hpp> |
7c673cae FG |
25 | #include <boost/asio/detail/reactor_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 reactive_null_buffers_op : public reactor_op |
35 | { | |
36 | public: | |
37 | BOOST_ASIO_DEFINE_HANDLER_PTR(reactive_null_buffers_op); | |
38 | ||
20effc67 TL |
39 | reactive_null_buffers_op(const boost::system::error_code& success_ec, |
40 | Handler& handler, const IoExecutor& io_ex) | |
41 | : reactor_op(success_ec, &reactive_null_buffers_op::do_perform, | |
7c673cae | 42 | &reactive_null_buffers_op::do_complete), |
92f5a8d4 | 43 | handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)), |
20effc67 | 44 | work_(handler_, io_ex) |
7c673cae FG |
45 | { |
46 | } | |
47 | ||
b32b8144 | 48 | static status do_perform(reactor_op*) |
7c673cae | 49 | { |
b32b8144 | 50 | return done; |
7c673cae FG |
51 | } |
52 | ||
b32b8144 | 53 | static void do_complete(void* owner, operation* base, |
7c673cae FG |
54 | const boost::system::error_code& /*ec*/, |
55 | std::size_t /*bytes_transferred*/) | |
56 | { | |
57 | // Take ownership of the handler object. | |
58 | reactive_null_buffers_op* o(static_cast<reactive_null_buffers_op*>(base)); | |
59 | ptr p = { boost::asio::detail::addressof(o->handler_), o, o }; | |
60 | ||
b32b8144 | 61 | BOOST_ASIO_HANDLER_COMPLETION((*o)); |
7c673cae | 62 | |
20effc67 TL |
63 | // Take ownership of the operation's outstanding work. |
64 | handler_work<Handler, IoExecutor> w( | |
65 | BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)( | |
66 | o->work_)); | |
67 | ||
7c673cae FG |
68 | // Make a copy of the handler so that the memory can be deallocated before |
69 | // the upcall is made. Even if we're not about to make an upcall, a | |
70 | // sub-object of the handler may be the true owner of the memory associated | |
71 | // with the handler. Consequently, a local copy of the handler is required | |
72 | // to ensure that any owning sub-object remains valid until after we have | |
73 | // deallocated the memory here. | |
74 | detail::binder2<Handler, boost::system::error_code, std::size_t> | |
75 | handler(o->handler_, o->ec_, o->bytes_transferred_); | |
76 | p.h = boost::asio::detail::addressof(handler.handler_); | |
77 | p.reset(); | |
78 | ||
79 | // Make the upcall if required. | |
80 | if (owner) | |
81 | { | |
82 | fenced_block b(fenced_block::half); | |
83 | BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); | |
b32b8144 | 84 | w.complete(handler, handler.handler_); |
7c673cae FG |
85 | BOOST_ASIO_HANDLER_INVOCATION_END; |
86 | } | |
87 | } | |
88 | ||
89 | private: | |
90 | Handler handler_; | |
20effc67 | 91 | handler_work<Handler, IoExecutor> work_; |
7c673cae FG |
92 | }; |
93 | ||
94 | } // namespace detail | |
95 | } // namespace asio | |
96 | } // namespace boost | |
97 | ||
98 | #include <boost/asio/detail/pop_options.hpp> | |
99 | ||
100 | #endif // BOOST_ASIO_DETAIL_REACTIVE_NULL_BUFFERS_OP_HPP |