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+//
+// detail/impl/resolver_service_base.ipp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 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_IMPL_RESOLVER_SERVICE_BASE_IPP
+#define ASIO_DETAIL_IMPL_RESOLVER_SERVICE_BASE_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/detail/resolver_service_base.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class resolver_service_base::work_io_context_runner
+{
+public:
+ work_io_context_runner(asio::io_context& io_context)
+ : io_context_(io_context) {}
+ void operator()() { io_context_.run(); }
+private:
+ asio::io_context& io_context_;
+};
+
+resolver_service_base::resolver_service_base(
+ asio::io_context& io_context)
+ : io_context_impl_(asio::use_service<io_context_impl>(io_context)),
+ work_io_context_(new asio::io_context(-1)),
+ work_io_context_impl_(asio::use_service<
+ io_context_impl>(*work_io_context_)),
+ work_(asio::make_work_guard(*work_io_context_)),
+ work_thread_(0)
+{
+}
+
+resolver_service_base::~resolver_service_base()
+{
+ base_shutdown();
+}
+
+void resolver_service_base::base_shutdown()
+{
+ work_.reset();
+ if (work_io_context_.get())
+ {
+ work_io_context_->stop();
+ if (work_thread_.get())
+ {
+ work_thread_->join();
+ work_thread_.reset();
+ }
+ work_io_context_.reset();
+ }
+}
+
+void resolver_service_base::base_notify_fork(
+ asio::io_context::fork_event fork_ev)
+{
+ if (work_thread_.get())
+ {
+ if (fork_ev == asio::io_context::fork_prepare)
+ {
+ work_io_context_->stop();
+ work_thread_->join();
+ }
+ else
+ {
+ work_io_context_->restart();
+ work_thread_.reset(new asio::detail::thread(
+ work_io_context_runner(*work_io_context_)));
+ }
+ }
+}
+
+void resolver_service_base::construct(
+ resolver_service_base::implementation_type& impl)
+{
+ impl.reset(static_cast<void*>(0), socket_ops::noop_deleter());
+}
+
+void resolver_service_base::destroy(
+ resolver_service_base::implementation_type& impl)
+{
+ ASIO_HANDLER_OPERATION((io_context_impl_.context(),
+ "resolver", &impl, 0, "cancel"));
+
+ impl.reset();
+}
+
+void resolver_service_base::move_construct(implementation_type& impl,
+ implementation_type& other_impl)
+{
+ impl = ASIO_MOVE_CAST(implementation_type)(other_impl);
+}
+
+void resolver_service_base::move_assign(implementation_type& impl,
+ resolver_service_base&, implementation_type& other_impl)
+{
+ destroy(impl);
+ impl = ASIO_MOVE_CAST(implementation_type)(other_impl);
+}
+
+void resolver_service_base::cancel(
+ resolver_service_base::implementation_type& impl)
+{
+ ASIO_HANDLER_OPERATION((io_context_impl_.context(),
+ "resolver", &impl, 0, "cancel"));
+
+ impl.reset(static_cast<void*>(0), socket_ops::noop_deleter());
+}
+
+void resolver_service_base::start_resolve_op(resolve_op* op)
+{
+ if (ASIO_CONCURRENCY_HINT_IS_LOCKING(SCHEDULER,
+ io_context_impl_.concurrency_hint()))
+ {
+ start_work_thread();
+ io_context_impl_.work_started();
+ work_io_context_impl_.post_immediate_completion(op, false);
+ }
+ else
+ {
+ op->ec_ = asio::error::operation_not_supported;
+ io_context_impl_.post_immediate_completion(op, false);
+ }
+}
+
+void resolver_service_base::start_work_thread()
+{
+ asio::detail::mutex::scoped_lock lock(mutex_);
+ if (!work_thread_.get())
+ {
+ work_thread_.reset(new asio::detail::thread(
+ work_io_context_runner(*work_io_context_)));
+ }
+}
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_IMPL_RESOLVER_SERVICE_BASE_IPP