libs/corosio/src/corosio/src/detail/select/acceptors.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_DETAIL_SELECT_ACCEPTORS_HPP
11		#define BOOST_COROSIO_DETAIL_SELECT_ACCEPTORS_HPP
12
13		#include <boost/corosio/detail/platform.hpp>
14
15		#if BOOST_COROSIO_HAS_SELECT
16
17		#include <boost/corosio/detail/config.hpp>
18		#include <boost/corosio/tcp_acceptor.hpp>
19		#include <boost/capy/ex/executor_ref.hpp>
20		#include <boost/capy/ex/execution_context.hpp>
21		#include "src/detail/intrusive.hpp"
22		#include "src/detail/socket_service.hpp"
23
24		#include "src/detail/select/op.hpp"
25		#include "src/detail/select/scheduler.hpp"
26
27		#include <memory>
28		#include <mutex>
29		#include <unordered_map>
30
31		namespace boost::corosio::detail {
32
33		class select_acceptor_service;
34		class select_acceptor_impl;
35		class select_socket_service;
36
37		/// Acceptor implementation for select backend.
38		class select_acceptor_impl
39		: public tcp_acceptor::acceptor_impl
40		, public std::enable_shared_from_this<select_acceptor_impl>
41		, public intrusive_list<select_acceptor_impl>::node
42		{
43		friend class select_acceptor_service;
44
45		public:
46		explicit select_acceptor_impl(select_acceptor_service& svc) noexcept;
47
48		void release() override;
49
50		void accept(
51		std::coroutine_handle<>,
52		capy::executor_ref,
53		std::stop_token,
54		std::error_code*,
55		io_object::io_object_impl**) override;
56
57		int native_handle() const noexcept { return fd_; }
58	4	endpoint local_endpoint() const noexcept override { return local_endpoint_; }
59		bool is_open() const noexcept { return fd_ >= 0; }
60		void cancel() noexcept override;
61		void cancel_single_op(select_op& op) noexcept;
62		void close_socket() noexcept;
63	42	void set_local_endpoint(endpoint ep) noexcept { local_endpoint_ = ep; }
64
65	2104	select_acceptor_service& service() noexcept { return svc_; }
66
67		select_accept_op acc_;
68
69		private:
70		select_acceptor_service& svc_;
71		int fd_ = -1;
72		endpoint local_endpoint_;
73		};
74
75		/** State for select acceptor service. */
76		class select_acceptor_state
77		{
78		public:
79	120	explicit select_acceptor_state(select_scheduler& sched) noexcept
80	120	: sched_(sched)
81		{
82	120	}
83
84		select_scheduler& sched_;
85		std::mutex mutex_;
86		intrusive_list<select_acceptor_impl> acceptor_list_;
87		std::unordered_map<select_acceptor_impl*, std::shared_ptr<select_acceptor_impl>> acceptor_ptrs_;
88		};
89
90		/** select acceptor service implementation.
91
92		Inherits from acceptor_service to enable runtime polymorphism.
93		Uses key_type = acceptor_service for service lookup.
94		*/
95		class select_acceptor_service : public acceptor_service
96		{
97		public:
98		explicit select_acceptor_service(capy::execution_context& ctx);
99		~select_acceptor_service();
100
101		select_acceptor_service(select_acceptor_service const&) = delete;
102		select_acceptor_service& operator=(select_acceptor_service const&) = delete;
103
104		void shutdown() override;
105
106		tcp_acceptor::acceptor_impl& create_acceptor_impl() override;
107		void destroy_acceptor_impl(tcp_acceptor::acceptor_impl& impl) override;
108		std::error_code open_acceptor(
109		tcp_acceptor::acceptor_impl& impl,
110		endpoint ep,
111		int backlog) override;
112
113	2150	select_scheduler& scheduler() const noexcept { return state_->sched_; }
114		void post(select_op* op);
115		void work_started() noexcept;
116		void work_finished() noexcept;
117
118		/** Get the socket service for creating peer sockets during accept. */
119		select_socket_service* socket_service() const noexcept;
120
121		private:
122		capy::execution_context& ctx_;
123		std::unique_ptr<select_acceptor_state> state_;
124		};
125
126		} // namespace boost::corosio::detail
127
128		#endif // BOOST_COROSIO_HAS_SELECT
129
130		#endif // BOOST_COROSIO_DETAIL_SELECT_ACCEPTORS_HPP
131