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diff --git a/boost/asio/detail/impl/resolver_service_base.ipp b/boost/asio/detail/impl/resolver_service_base.ipp
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index 0000000000..6a384e4f8b
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+++ b/boost/asio/detail/impl/resolver_service_base.ipp
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+//
+// detail/impl/resolver_service_base.ipp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// 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_IMPL_RESOLVER_SERVICE_BASE_IPP
+#define BOOST_ASIO_DETAIL_IMPL_RESOLVER_SERVICE_BASE_IPP
+
+#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/detail/resolver_service_base.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+class resolver_service_base::work_io_service_runner
+{
+public:
+  work_io_service_runner(boost::asio::io_service& io_service)
+    : io_service_(io_service) {}
+  void operator()() { io_service_.run(); }
+private:
+  boost::asio::io_service& io_service_;
+};
+
+resolver_service_base::resolver_service_base(
+    boost::asio::io_service& io_service)
+  : io_service_impl_(boost::asio::use_service<io_service_impl>(io_service)),
+    work_io_service_(new boost::asio::io_service),
+    work_io_service_impl_(boost::asio::use_service<
+        io_service_impl>(*work_io_service_)),
+    work_(new boost::asio::io_service::work(*work_io_service_)),
+    work_thread_(0)
+{
+}
+
+resolver_service_base::~resolver_service_base()
+{
+  shutdown_service();
+}
+
+void resolver_service_base::shutdown_service()
+{
+  work_.reset();
+  if (work_io_service_.get())
+  {
+    work_io_service_->stop();
+    if (work_thread_.get())
+    {
+      work_thread_->join();
+      work_thread_.reset();
+    }
+    work_io_service_.reset();
+  }
+}
+
+void resolver_service_base::fork_service(
+    boost::asio::io_service::fork_event fork_ev)
+{
+  if (work_thread_.get())
+  {
+    if (fork_ev == boost::asio::io_service::fork_prepare)
+    {
+      work_io_service_->stop();
+      work_thread_->join();
+    }
+    else
+    {
+      work_io_service_->reset();
+      work_thread_.reset(new boost::asio::detail::thread(
+            work_io_service_runner(*work_io_service_)));
+    }
+  }
+}
+
+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)
+{
+  BOOST_ASIO_HANDLER_OPERATION(("resolver", &impl, "cancel"));
+
+  impl.reset();
+}
+
+void resolver_service_base::cancel(
+    resolver_service_base::implementation_type& impl)
+{
+  BOOST_ASIO_HANDLER_OPERATION(("resolver", &impl, "cancel"));
+
+  impl.reset(static_cast<void*>(0), socket_ops::noop_deleter());
+}
+
+void resolver_service_base::start_resolve_op(operation* op)
+{
+  start_work_thread();
+  io_service_impl_.work_started();
+  work_io_service_impl_.post_immediate_completion(op);
+}
+
+void resolver_service_base::start_work_thread()
+{
+  boost::asio::detail::mutex::scoped_lock lock(mutex_);
+  if (!work_thread_.get())
+  {
+    work_thread_.reset(new boost::asio::detail::thread(
+          work_io_service_runner(*work_io_service_)));
+  }
+}
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_IMPL_RESOLVER_SERVICE_BASE_IPP