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+//
+// detail/resolver_service_base.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP
+#define ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/error.hpp"
+#include "asio/execution_context.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/resolve_op.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/scoped_ptr.hpp"
+#include "asio/detail/thread.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+# include "asio/detail/win_iocp_io_context.hpp"
+#else // defined(ASIO_HAS_IOCP)
+# include "asio/detail/scheduler.hpp"
+#endif // defined(ASIO_HAS_IOCP)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class resolver_service_base
+{
+public:
+ // The implementation type of the resolver. A cancellation token is used to
+ // indicate to the background thread that the operation has been cancelled.
+ typedef socket_ops::shared_cancel_token_type implementation_type;
+
+ // Constructor.
+ ASIO_DECL resolver_service_base(execution_context& context);
+
+ // Destructor.
+ ASIO_DECL ~resolver_service_base();
+
+ // Destroy all user-defined handler objects owned by the service.
+ ASIO_DECL void base_shutdown();
+
+ // Perform any fork-related housekeeping.
+ ASIO_DECL void base_notify_fork(
+ execution_context::fork_event fork_ev);
+
+ // Construct a new resolver implementation.
+ ASIO_DECL void construct(implementation_type& impl);
+
+ // Destroy a resolver implementation.
+ ASIO_DECL void destroy(implementation_type&);
+
+ // Move-construct a new resolver implementation.
+ ASIO_DECL void move_construct(implementation_type& impl,
+ implementation_type& other_impl);
+
+ // Move-assign from another resolver implementation.
+ ASIO_DECL void move_assign(implementation_type& impl,
+ resolver_service_base& other_service,
+ implementation_type& other_impl);
+
+ // Move-construct a new timer implementation.
+ void converting_move_construct(implementation_type& impl,
+ resolver_service_base&, implementation_type& other_impl)
+ {
+ move_construct(impl, other_impl);
+ }
+
+ // Move-assign from another timer implementation.
+ void converting_move_assign(implementation_type& impl,
+ resolver_service_base& other_service,
+ implementation_type& other_impl)
+ {
+ move_assign(impl, other_service, other_impl);
+ }
+
+ // Cancel pending asynchronous operations.
+ ASIO_DECL void cancel(implementation_type& impl);
+
+protected:
+ // Helper function to start an asynchronous resolve operation.
+ ASIO_DECL void start_resolve_op(resolve_op* op);
+
+#if !defined(ASIO_WINDOWS_RUNTIME)
+ // Helper class to perform exception-safe cleanup of addrinfo objects.
+ class auto_addrinfo
+ : private asio::detail::noncopyable
+ {
+ public:
+ explicit auto_addrinfo(asio::detail::addrinfo_type* ai)
+ : ai_(ai)
+ {
+ }
+
+ ~auto_addrinfo()
+ {
+ if (ai_)
+ socket_ops::freeaddrinfo(ai_);
+ }
+
+ operator asio::detail::addrinfo_type*()
+ {
+ return ai_;
+ }
+
+ private:
+ asio::detail::addrinfo_type* ai_;
+ };
+#endif // !defined(ASIO_WINDOWS_RUNTIME)
+
+ // Helper class to run the work scheduler in a thread.
+ class work_scheduler_runner;
+
+ // Start the work scheduler if it's not already running.
+ ASIO_DECL void start_work_thread();
+
+ // The scheduler implementation used to post completions.
+#if defined(ASIO_HAS_IOCP)
+ typedef class win_iocp_io_context scheduler_impl;
+#else
+ typedef class scheduler scheduler_impl;
+#endif
+ scheduler_impl& scheduler_;
+
+private:
+ // Mutex to protect access to internal data.
+ asio::detail::mutex mutex_;
+
+ // Private scheduler used for performing asynchronous host resolution.
+ asio::detail::scoped_ptr<scheduler_impl> work_scheduler_;
+
+ // Thread used for running the work io_context's run loop.
+ asio::detail::scoped_ptr<asio::detail::thread> work_thread_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/detail/impl/resolver_service_base.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP