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//
// detail/resolver_service_base.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2012 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 BOOST_ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP
#define BOOST_ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#include <boost/asio/error.hpp>
#include <boost/asio/io_service.hpp>
#include <boost/asio/detail/mutex.hpp>
#include <boost/asio/detail/noncopyable.hpp>
#include <boost/asio/detail/operation.hpp>
#include <boost/asio/detail/socket_ops.hpp>
#include <boost/asio/detail/socket_types.hpp>
#include <boost/asio/detail/scoped_ptr.hpp>
#include <boost/asio/detail/thread.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
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.
BOOST_ASIO_DECL resolver_service_base(boost::asio::io_service& io_service);
// Destructor.
BOOST_ASIO_DECL ~resolver_service_base();
// Destroy all user-defined handler objects owned by the service.
BOOST_ASIO_DECL void shutdown_service();
// Perform any fork-related housekeeping.
BOOST_ASIO_DECL void fork_service(
boost::asio::io_service::fork_event fork_ev);
// Construct a new resolver implementation.
BOOST_ASIO_DECL void construct(implementation_type& impl);
// Destroy a resolver implementation.
BOOST_ASIO_DECL void destroy(implementation_type&);
// Cancel pending asynchronous operations.
BOOST_ASIO_DECL void cancel(implementation_type& impl);
protected:
// Helper function to start an asynchronous resolve operation.
BOOST_ASIO_DECL void start_resolve_op(operation* op);
// Helper class to perform exception-safe cleanup of addrinfo objects.
class auto_addrinfo
: private boost::asio::detail::noncopyable
{
public:
explicit auto_addrinfo(boost::asio::detail::addrinfo_type* ai)
: ai_(ai)
{
}
~auto_addrinfo()
{
if (ai_)
socket_ops::freeaddrinfo(ai_);
}
operator boost::asio::detail::addrinfo_type*()
{
return ai_;
}
private:
boost::asio::detail::addrinfo_type* ai_;
};
// Helper class to run the work io_service in a thread.
class work_io_service_runner;
// Start the work thread if it's not already running.
BOOST_ASIO_DECL void start_work_thread();
// The io_service implementation used to post completions.
io_service_impl& io_service_impl_;
private:
// Mutex to protect access to internal data.
boost::asio::detail::mutex mutex_;
// Private io_service used for performing asynchronous host resolution.
boost::asio::detail::scoped_ptr<boost::asio::io_service> work_io_service_;
// The work io_service implementation used to post completions.
io_service_impl& work_io_service_impl_;
// Work for the private io_service to perform.
boost::asio::detail::scoped_ptr<boost::asio::io_service::work> work_;
// Thread used for running the work io_service's run loop.
boost::asio::detail::scoped_ptr<boost::asio::detail::thread> work_thread_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#if defined(BOOST_ASIO_HEADER_ONLY)
# include <boost/asio/detail/impl/resolver_service_base.ipp>
#endif // defined(BOOST_ASIO_HEADER_ONLY)
#endif // BOOST_ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP
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