// | |
// detail/resolve_op.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_RESOLVE_OP_HPP | |
#define BOOST_ASIO_DETAIL_RESOLVE_OP_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/utility/addressof.hpp> | |
#include <boost/asio/error.hpp> | |
#include <boost/asio/io_service.hpp> | |
#include <boost/asio/ip/basic_resolver_iterator.hpp> | |
#include <boost/asio/ip/basic_resolver_query.hpp> | |
#include <boost/asio/detail/bind_handler.hpp> | |
#include <boost/asio/detail/fenced_block.hpp> | |
#include <boost/asio/detail/handler_alloc_helpers.hpp> | |
#include <boost/asio/detail/handler_invoke_helpers.hpp> | |
#include <boost/asio/detail/operation.hpp> | |
#include <boost/asio/detail/socket_ops.hpp> | |
#include <boost/asio/detail/push_options.hpp> | |
namespace boost { | |
namespace asio { | |
namespace detail { | |
template <typename Protocol, typename Handler> | |
class resolve_op : public operation | |
{ | |
public: | |
BOOST_ASIO_DEFINE_HANDLER_PTR(resolve_op); | |
typedef boost::asio::ip::basic_resolver_query<Protocol> query_type; | |
typedef boost::asio::ip::basic_resolver_iterator<Protocol> iterator_type; | |
resolve_op(socket_ops::weak_cancel_token_type cancel_token, | |
const query_type& query, io_service_impl& ios, Handler handler) | |
: operation(&resolve_op::do_complete), | |
cancel_token_(cancel_token), | |
query_(query), | |
io_service_impl_(ios), | |
handler_(handler), | |
addrinfo_(0) | |
{ | |
} | |
~resolve_op() | |
{ | |
if (addrinfo_) | |
socket_ops::freeaddrinfo(addrinfo_); | |
} | |
static void do_complete(io_service_impl* owner, operation* base, | |
boost::system::error_code /*ec*/, std::size_t /*bytes_transferred*/) | |
{ | |
// Take ownership of the operation object. | |
resolve_op* o(static_cast<resolve_op*>(base)); | |
ptr p = { boost::addressof(o->handler_), o, o }; | |
if (owner && owner != &o->io_service_impl_) | |
{ | |
// The operation is being run on the worker io_service. Time to perform | |
// the resolver operation. | |
// Perform the blocking host resolution operation. | |
socket_ops::background_getaddrinfo(o->cancel_token_, | |
o->query_.host_name().c_str(), o->query_.service_name().c_str(), | |
o->query_.hints(), &o->addrinfo_, o->ec_); | |
// Pass operation back to main io_service for completion. | |
o->io_service_impl_.post_deferred_completion(o); | |
p.v = p.p = 0; | |
} | |
else | |
{ | |
// The operation has been returned to the main io_service. The completion | |
// handler is ready to be delivered. | |
// Make a copy of the handler so that the memory can be deallocated | |
// before the upcall is made. Even if we're not about to make an upcall, | |
// a sub-object of the handler may be the true owner of the memory | |
// associated with the handler. Consequently, a local copy of the handler | |
// is required to ensure that any owning sub-object remains valid until | |
// after we have deallocated the memory here. | |
detail::binder2<Handler, boost::system::error_code, iterator_type> | |
handler(o->handler_, o->ec_, iterator_type()); | |
p.h = boost::addressof(handler.handler_); | |
if (o->addrinfo_) | |
{ | |
handler.arg2_ = iterator_type::create(o->addrinfo_, | |
o->query_.host_name(), o->query_.service_name()); | |
} | |
p.reset(); | |
if (owner) | |
{ | |
boost::asio::detail::fenced_block b; | |
boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_); | |
} | |
} | |
} | |
private: | |
socket_ops::weak_cancel_token_type cancel_token_; | |
query_type query_; | |
io_service_impl& io_service_impl_; | |
Handler handler_; | |
boost::system::error_code ec_; | |
boost::asio::detail::addrinfo_type* addrinfo_; | |
}; | |
} // namespace detail | |
} // namespace asio | |
} // namespace boost | |
#include <boost/asio/detail/pop_options.hpp> | |
#endif // BOOST_ASIO_DETAIL_RESOLVE_OP_HPP |