include/boost/corosio/native/native_local_stream_acceptor.hpp

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native_local_stream_acceptor.hpp

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1		//
2		// Copyright (c) 2026 Steve Gerbino
3		//
4		// Distributed under the Boost Software License, Version 1.0. (See accompanying
5		// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6		//
7		// Official repository: https://github.com/cppalliance/corosio
8		//
9
10		#ifndef BOOST_COROSIO_NATIVE_NATIVE_LOCAL_STREAM_ACCEPTOR_HPP
11		#define BOOST_COROSIO_NATIVE_NATIVE_LOCAL_STREAM_ACCEPTOR_HPP
12
13		#include <boost/corosio/local_stream_acceptor.hpp>
14		#include <boost/corosio/native/native_local_stream_socket.hpp>
15		#include <boost/corosio/backend.hpp>
16		#include <boost/corosio/detail/op_base.hpp>
17
18		#ifndef BOOST_COROSIO_MRDOCS
19		#if BOOST_COROSIO_HAS_EPOLL
20		#include <boost/corosio/native/detail/epoll/epoll_types.hpp>
21		#endif
22
23		#if BOOST_COROSIO_HAS_SELECT
24		#include <boost/corosio/native/detail/select/select_types.hpp>
25		#endif
26
27		#if BOOST_COROSIO_HAS_KQUEUE
28		#include <boost/corosio/native/detail/kqueue/kqueue_types.hpp>
29		#endif
30
31		#if BOOST_COROSIO_HAS_URING
32		#include <boost/corosio/native/detail/uring/uring_types.hpp>
33		#endif
34
35		#if BOOST_COROSIO_HAS_IOCP
36		#include <boost/corosio/native/detail/iocp/win_local_stream_acceptor_service.hpp>
37		#endif
38		#endif // !BOOST_COROSIO_MRDOCS
39
40		namespace boost::corosio {
41
42		/** An asynchronous Unix stream acceptor with devirtualized accept.
43
44		This class template inherits from @ref local_stream_acceptor
45		and shadows both `accept` overloads (the peer-reference form
46		and the move-return form) with versions that call the backend
47		implementation directly, allowing the compiler to inline
48		through the entire call chain. The move-return form yields a
49		@ref native_local_stream_socket so subsequent I/O on the peer
50		is also devirtualized.
51
52		Non-async operations (`listen`, `close`, `cancel`) remain
53		unchanged and dispatch through the compiled library.
54
55		A `native_local_stream_acceptor` IS-A `local_stream_acceptor`
56		and can be passed to any function expecting
57		`local_stream_acceptor&`.
58
59		@tparam Backend A backend tag value (e.g., `epoll`).
60
61		@par Thread Safety
62		Same as @ref local_stream_acceptor.
63
64		@see local_stream_acceptor, epoll_t, iocp_t
65		*/
66		template<auto Backend>
67		class native_local_stream_acceptor : public local_stream_acceptor
68		{
69		using backend_type = decltype(Backend);
70		using impl_type = typename backend_type::local_stream_acceptor_type;
71		using service_type =
72		typename backend_type::local_stream_acceptor_service_type;
73
74	10x	impl_type& get_impl() noexcept
75		{
76	10x	return static_cast<impl_type>(h_.get());
77		}
78
79		struct native_wait_awaitable : detail::void_op_base<native_wait_awaitable>
80		{
81		native_local_stream_acceptor& acc_;
82		wait_type w_;
83
84	6x	native_wait_awaitable(
85		native_local_stream_acceptor& acc, wait_type w) noexcept
86	6x	: acc_(acc)
87	6x	, w_(w)
88		{
89	6x	}
90
91		std::coroutine_handle<>
92	4x	dispatch(std::coroutine_handle<> h, capy::executor_ref ex) const
93		{
94	4x	return acc_.get_impl().wait(h, ex, w_, this->token_, &this->ec_);
95		}
96		};
97
98		struct native_accept_awaitable
99		: detail::void_op_base<native_accept_awaitable>
100		{
101		native_local_stream_acceptor& acc_;
102		local_stream_socket& peer_;
103		mutable io_object::implementation* peer_impl_ = nullptr;
104
105	8x	native_accept_awaitable(
106		native_local_stream_acceptor& acc,
107		local_stream_socket& peer) noexcept
108	8x	: acc_(acc)
109	8x	, peer_(peer)
110		{
111	8x	}
112
113	8x	[[nodiscard]] capy::io_result<> await_resume() const noexcept
114		{
115	8x	if (!this->ec_)
116	4x	acc_.reset_peer_impl(peer_, peer_impl_);
117	8x	return {this->ec_};
118		}
119
120		std::coroutine_handle<>
121	4x	dispatch(std::coroutine_handle<> h, capy::executor_ref ex) const
122		{
123	12x	return acc_.get_impl().accept(
124	12x	h, ex, this->token_, &this->ec_, &peer_impl_);
125		}
126		};
127
128		struct native_move_accept_awaitable
129		: detail::void_op_base<native_move_accept_awaitable>
130		{
131		native_local_stream_acceptor& acc_;
132		mutable io_object::implementation* peer_impl_ = nullptr;
133
134	6x	explicit native_move_accept_awaitable(
135		native_local_stream_acceptor& acc) noexcept
136	6x	: acc_(acc)
137		{
138	6x	}
139
140		[[nodiscard]] capy::io_result<native_local_stream_socket<Backend>>
141	6x	await_resume() const noexcept
142		{
143	6x	if (this->ec_ \|\| !peer_impl_)
144		return {
145	4x	this->ec_,
146	4x	native_local_stream_socket<Backend>(acc_.context())};
147
148	2x	native_local_stream_socket<Backend> peer(acc_.context());
149	2x	acc_.reset_peer_impl(peer, peer_impl_);
150	2x	return {this->ec_, std::move(peer)};
151	2x	}
152
153		std::coroutine_handle<>
154	2x	dispatch(std::coroutine_handle<> h, capy::executor_ref ex) const
155		{
156	6x	return acc_.get_impl().accept(
157	6x	h, ex, this->token_, &this->ec_, &peer_impl_);
158		}
159		};
160
161		public:
162		/** Construct a native acceptor from an execution context.
163
164		@param ctx The execution context that will own this acceptor.
165		*/
166	18x	explicit native_local_stream_acceptor(capy::execution_context& ctx)
167	18x	: local_stream_acceptor(create_handle<service_type>(ctx), ctx)
168		{
169	18x	}
170
171		/** Construct a native acceptor from an executor.
172
173		@param ex The executor whose context will own the acceptor.
174		*/
175		template<class Ex>
176		requires(!std::same_as<
177		std::remove_cvref_t<Ex>,
178		native_local_stream_acceptor>) &&
179		capy::Executor<Ex>
180		explicit native_local_stream_acceptor(Ex const& ex)
181		: native_local_stream_acceptor(ex.context())
182		{
183		}
184
185		/// Move construct.
186	2x	native_local_stream_acceptor(native_local_stream_acceptor&&) noexcept =
187		default;
188
189		/// Move assign.
190		native_local_stream_acceptor&
191		operator=(native_local_stream_acceptor&&) noexcept = default;
192
193		native_local_stream_acceptor(native_local_stream_acceptor const&) = delete;
194		native_local_stream_acceptor&
195		operator=(native_local_stream_acceptor const&) = delete;
196
197		/** Asynchronously accept an incoming connection.
198
199		Calls the backend implementation directly, bypassing virtual
200		dispatch. Otherwise identical to @ref local_stream_acceptor::accept.
201
202		@param peer The socket to receive the accepted connection.
203
204		@return An awaitable yielding `io_result<>`.
205
206		A closed acceptor reports `errc::bad_file_descriptor`.
207
208		Both this acceptor and @p peer must outlive the returned
209		awaitable.
210		*/
211	8x	[[nodiscard]] auto accept(local_stream_socket& peer)
212		{
213	8x	native_accept_awaitable aw(*this, peer);
214	8x	if (!is_open())
215	2x	aw.ec_ = make_error_code(std::errc::bad_file_descriptor);
216	8x	return aw;
217		}
218
219		/** Asynchronously accept an incoming connection, returning the peer.
220
221		Calls the backend implementation directly, bypassing virtual
222		dispatch. The accepted peer is returned as a
223		@ref native_local_stream_socket so that subsequent I/O on it
224		is also devirtualized.
225
226		@return An awaitable yielding
227		`io_result<native_local_stream_socket<Backend>>`.
228
229		A closed acceptor reports `errc::bad_file_descriptor`.
230
231		@throws std::logic_error If the acceptor has been moved from.
232
233		This acceptor must outlive the returned awaitable.
234		*/
235	8x	[[nodiscard]] auto accept()
236		{
237		// The awaitable builds the peer from context(), which a
238		// moved-from acceptor no longer has.
239	8x	if (!h_)
240	2x	detail::throw_logic_error("accept: acceptor moved-from");
241	6x	native_move_accept_awaitable aw(*this);
242	6x	if (!is_open())
243	2x	aw.ec_ = make_error_code(std::errc::bad_file_descriptor);
244	6x	return aw;
245		}
246
247		/** Asynchronously wait for the acceptor to be ready.
248
249		Calls the backend implementation directly, bypassing virtual
250		dispatch. Otherwise identical to @ref local_stream_acceptor::wait.
251
252		@param w The wait direction (typically `wait_type::read`).
253
254		@return An awaitable yielding `io_result<>`.
255		*/
256	6x	[[nodiscard]] auto wait(wait_type w)
257		{
258	6x	return native_wait_awaitable(*this, w);
259		}
260		};
261
262		} // namespace boost::corosio
263
264		#endif // BOOST_COROSIO_NATIVE_NATIVE_LOCAL_STREAM_ACCEPTOR_HPP
265