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+//
+// detail/resolve_query_op.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_RESOLVE_QUERY_OP_HPP
+#define ASIO_DETAIL_RESOLVE_QUERY_OP_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/handler_work.hpp"
+#include "asio/detail/memory.hpp"
+#include "asio/detail/resolve_op.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/error.hpp"
+#include "asio/ip/basic_resolver_query.hpp"
+#include "asio/ip/basic_resolver_results.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 {
+
+template <typename Protocol, typename Handler, typename IoExecutor>
+class resolve_query_op : public resolve_op
+{
+public:
+ ASIO_DEFINE_HANDLER_PTR(resolve_query_op);
+
+ typedef asio::ip::basic_resolver_query<Protocol> query_type;
+ typedef asio::ip::basic_resolver_results<Protocol> results_type;
+
+#if defined(ASIO_HAS_IOCP)
+ typedef class win_iocp_io_context scheduler_impl;
+#else
+ typedef class scheduler scheduler_impl;
+#endif
+
+ resolve_query_op(socket_ops::weak_cancel_token_type cancel_token,
+ const query_type& qry, scheduler_impl& sched,
+ Handler& handler, const IoExecutor& io_ex)
+ : resolve_op(&resolve_query_op::do_complete),
+ cancel_token_(cancel_token),
+ query_(qry),
+ scheduler_(sched),
+ handler_(ASIO_MOVE_CAST(Handler)(handler)),
+ work_(handler_, io_ex),
+ addrinfo_(0)
+ {
+ }
+
+ ~resolve_query_op()
+ {
+ if (addrinfo_)
+ socket_ops::freeaddrinfo(addrinfo_);
+ }
+
+ static void do_complete(void* owner, operation* base,
+ const asio::error_code& /*ec*/,
+ std::size_t /*bytes_transferred*/)
+ {
+ // Take ownership of the operation object.
+ resolve_query_op* o(static_cast<resolve_query_op*>(base));
+ ptr p = { asio::detail::addressof(o->handler_), o, o };
+
+ if (owner && owner != &o->scheduler_)
+ {
+ // The operation is being run on the worker io_context. 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_context for completion.
+ o->scheduler_.post_deferred_completion(o);
+ p.v = p.p = 0;
+ }
+ else
+ {
+ // The operation has been returned to the main io_context. The completion
+ // handler is ready to be delivered.
+
+ ASIO_HANDLER_COMPLETION((*o));
+
+ // Take ownership of the operation's outstanding work.
+ handler_work<Handler, IoExecutor> w(
+ ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)(
+ o->work_));
+
+ // 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, asio::error_code, results_type>
+ handler(o->handler_, o->ec_, results_type());
+ p.h = asio::detail::addressof(handler.handler_);
+ if (o->addrinfo_)
+ {
+ handler.arg2_ = results_type::create(o->addrinfo_,
+ o->query_.host_name(), o->query_.service_name());
+ }
+ p.reset();
+
+ if (owner)
+ {
+ fenced_block b(fenced_block::half);
+ ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, "..."));
+ w.complete(handler, handler.handler_);
+ ASIO_HANDLER_INVOCATION_END;
+ }
+ }
+ }
+
+private:
+ socket_ops::weak_cancel_token_type cancel_token_;
+ query_type query_;
+ scheduler_impl& scheduler_;
+ Handler handler_;
+ handler_work<Handler, IoExecutor> work_;
+ asio::detail::addrinfo_type* addrinfo_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_RESOLVE_QUERY_OP_HPP