141 lines
3.9 KiB
C++
141 lines
3.9 KiB
C++
//
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// detail/resolver_service_base.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP
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#define ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#include "asio/error.hpp"
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#include "asio/executor_work_guard.hpp"
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#include "asio/io_context.hpp"
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#include "asio/detail/mutex.hpp"
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#include "asio/detail/noncopyable.hpp"
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#include "asio/detail/resolve_op.hpp"
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#include "asio/detail/socket_ops.hpp"
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#include "asio/detail/socket_types.hpp"
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#include "asio/detail/scoped_ptr.hpp"
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#include "asio/detail/thread.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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class resolver_service_base
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{
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public:
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// The implementation type of the resolver. A cancellation token is used to
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// indicate to the background thread that the operation has been cancelled.
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typedef socket_ops::shared_cancel_token_type implementation_type;
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// Constructor.
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ASIO_DECL resolver_service_base(asio::io_context& io_context);
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// Destructor.
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ASIO_DECL ~resolver_service_base();
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// Destroy all user-defined handler objects owned by the service.
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ASIO_DECL void base_shutdown();
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// Perform any fork-related housekeeping.
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ASIO_DECL void base_notify_fork(
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asio::io_context::fork_event fork_ev);
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// Construct a new resolver implementation.
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ASIO_DECL void construct(implementation_type& impl);
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// Destroy a resolver implementation.
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ASIO_DECL void destroy(implementation_type&);
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// Move-construct a new resolver implementation.
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ASIO_DECL void move_construct(implementation_type& impl,
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implementation_type& other_impl);
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// Move-assign from another resolver implementation.
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ASIO_DECL void move_assign(implementation_type& impl,
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resolver_service_base& other_service,
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implementation_type& other_impl);
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// Cancel pending asynchronous operations.
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ASIO_DECL void cancel(implementation_type& impl);
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protected:
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// Helper function to start an asynchronous resolve operation.
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ASIO_DECL void start_resolve_op(resolve_op* op);
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#if !defined(ASIO_WINDOWS_RUNTIME)
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// Helper class to perform exception-safe cleanup of addrinfo objects.
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class auto_addrinfo
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: private asio::detail::noncopyable
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{
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public:
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explicit auto_addrinfo(asio::detail::addrinfo_type* ai)
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: ai_(ai)
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{
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}
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~auto_addrinfo()
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{
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if (ai_)
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socket_ops::freeaddrinfo(ai_);
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}
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operator asio::detail::addrinfo_type*()
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{
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return ai_;
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}
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private:
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asio::detail::addrinfo_type* ai_;
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};
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#endif // !defined(ASIO_WINDOWS_RUNTIME)
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// Helper class to run the work io_context in a thread.
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class work_io_context_runner;
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// Start the work thread if it's not already running.
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ASIO_DECL void start_work_thread();
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// The io_context implementation used to post completions.
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io_context_impl& io_context_impl_;
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private:
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// Mutex to protect access to internal data.
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asio::detail::mutex mutex_;
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// Private io_context used for performing asynchronous host resolution.
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asio::detail::scoped_ptr<asio::io_context> work_io_context_;
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// The work io_context implementation used to post completions.
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io_context_impl& work_io_context_impl_;
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// Work for the private io_context to perform.
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asio::executor_work_guard<
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asio::io_context::executor_type> work_;
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// Thread used for running the work io_context's run loop.
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asio::detail::scoped_ptr<asio::detail::thread> work_thread_;
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#if defined(ASIO_HEADER_ONLY)
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# include "asio/detail/impl/resolver_service_base.ipp"
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#endif // defined(ASIO_HEADER_ONLY)
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#endif // ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP
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