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//
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// detail/resolver_service_base.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2015 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 BOOST_ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP
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#define BOOST_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 <boost/asio/detail/config.hpp>
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#include <boost/asio/error.hpp>
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#include <boost/asio/io_service.hpp>
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#include <boost/asio/detail/mutex.hpp>
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#include <boost/asio/detail/noncopyable.hpp>
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#include <boost/asio/detail/operation.hpp>
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#include <boost/asio/detail/socket_ops.hpp>
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#include <boost/asio/detail/socket_types.hpp>
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#include <boost/asio/detail/scoped_ptr.hpp>
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#include <boost/asio/detail/thread.hpp>
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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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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  BOOST_ASIO_DECL resolver_service_base(boost::asio::io_service& io_service);
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  // Destructor.
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  BOOST_ASIO_DECL ~resolver_service_base();
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  // Destroy all user-defined handler objects owned by the service.
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  BOOST_ASIO_DECL void shutdown_service();
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  // Perform any fork-related housekeeping.
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  BOOST_ASIO_DECL void fork_service(
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      boost::asio::io_service::fork_event fork_ev);
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  // Construct a new resolver implementation.
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  BOOST_ASIO_DECL void construct(implementation_type& impl);
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  // Destroy a resolver implementation.
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  BOOST_ASIO_DECL void destroy(implementation_type&);
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  // Cancel pending asynchronous operations.
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  BOOST_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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  BOOST_ASIO_DECL void start_resolve_op(operation* op);
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#if !defined(BOOST_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 boost::asio::detail::noncopyable
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  {
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  public:
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    explicit auto_addrinfo(boost::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 boost::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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    boost::asio::detail::addrinfo_type* ai_;
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  };
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#endif // !defined(BOOST_ASIO_WINDOWS_RUNTIME)
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  // Helper class to run the work io_service in a thread.
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  class work_io_service_runner;
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  // Start the work thread if it's not already running.
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  BOOST_ASIO_DECL void start_work_thread();
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  // The io_service implementation used to post completions.
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  io_service_impl& io_service_impl_;
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private:
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  // Mutex to protect access to internal data.
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  boost::asio::detail::mutex mutex_;
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  // Private io_service used for performing asynchronous host resolution.
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  boost::asio::detail::scoped_ptr<boost::asio::io_service> work_io_service_;
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  // The work io_service implementation used to post completions.
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  io_service_impl& work_io_service_impl_;
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  // Work for the private io_service to perform.
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  boost::asio::detail::scoped_ptr<boost::asio::io_service::work> work_;
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  // Thread used for running the work io_service's run loop.
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  boost::asio::detail::scoped_ptr<boost::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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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#if defined(BOOST_ASIO_HEADER_ONLY)
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# include <boost/asio/detail/impl/resolver_service_base.ipp>
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#endif // defined(BOOST_ASIO_HEADER_ONLY)
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#endif // BOOST_ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP