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1 | // | |
2 | // detail/impl/strand_service.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2023 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_STRAND_SERVICE_HPP | |
12 | #define BOOST_ASIO_DETAIL_IMPL_STRAND_SERVICE_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/completion_handler.hpp> | |
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> | |
22 | #include <boost/asio/detail/memory.hpp> | |
23 | ||
24 | #include <boost/asio/detail/push_options.hpp> | |
25 | ||
26 | namespace boost { | |
27 | namespace asio { | |
28 | namespace detail { | |
29 | ||
30 | inline strand_service::strand_impl::strand_impl() | |
31 | : operation(&strand_service::do_complete), | |
32 | locked_(false) | |
33 | { | |
34 | } | |
35 | ||
36 | template <typename Handler> | |
37 | void strand_service::dispatch(strand_service::implementation_type& impl, | |
38 | Handler& handler) | |
39 | { | |
40 | // If we are already in the strand then the handler can run immediately. | |
41 | if (running_in_this_thread(impl)) | |
42 | { | |
43 | fenced_block b(fenced_block::full); | |
44 | boost_asio_handler_invoke_helpers::invoke(handler, handler); | |
45 | return; | |
46 | } | |
47 | ||
48 | // Allocate and construct an operation to wrap the handler. | |
49 | typedef completion_handler<Handler, io_context::executor_type> op; | |
50 | typename op::ptr p = { boost::asio::detail::addressof(handler), | |
51 | op::ptr::allocate(handler), 0 }; | |
52 | p.p = new (p.v) op(handler, io_context_.get_executor()); | |
53 | ||
54 | BOOST_ASIO_HANDLER_CREATION((this->context(), | |
55 | *p.p, "strand", impl, 0, "dispatch")); | |
56 | ||
57 | operation* o = p.p; | |
58 | p.v = p.p = 0; | |
59 | do_dispatch(impl, o); | |
60 | } | |
61 | ||
62 | // Request the io_context to invoke the given handler and return immediately. | |
63 | template <typename Handler> | |
64 | void strand_service::post(strand_service::implementation_type& impl, | |
65 | Handler& handler) | |
66 | { | |
67 | bool is_continuation = | |
68 | boost_asio_handler_cont_helpers::is_continuation(handler); | |
69 | ||
70 | // Allocate and construct an operation to wrap the handler. | |
71 | typedef completion_handler<Handler, io_context::executor_type> op; | |
72 | typename op::ptr p = { boost::asio::detail::addressof(handler), | |
73 | op::ptr::allocate(handler), 0 }; | |
74 | p.p = new (p.v) op(handler, io_context_.get_executor()); | |
75 | ||
76 | BOOST_ASIO_HANDLER_CREATION((this->context(), | |
77 | *p.p, "strand", impl, 0, "post")); | |
78 | ||
79 | do_post(impl, p.p, is_continuation); | |
80 | p.v = p.p = 0; | |
81 | } | |
82 | ||
83 | } // namespace detail | |
84 | } // namespace asio | |
85 | } // namespace boost | |
86 | ||
87 | #include <boost/asio/detail/pop_options.hpp> | |
88 | ||
89 | #endif // BOOST_ASIO_DETAIL_IMPL_STRAND_SERVICE_HPP |