// | |
// detail/resolver_service_base.hpp | |
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
// | |
// Copyright (c) 2003-2011 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/scoped_ptr.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/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(); | |
// 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::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::scoped_ptr<boost::asio::io_service::work> work_; | |
// Thread used for running the work io_service's run loop. | |
boost::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 |