text: //
  // detail/reactive_socket_service_base.ipp
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  //
  // Copyright (c) 2003-2016 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_REACTIVE_SOCKET_SERVICE_BASE_IPP
  #define ASIO_DETAIL_IMPL_REACTIVE_SOCKET_SERVICE_BASE_IPP
  
  #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  # pragma once
  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  
  #include "asio/detail/config.hpp"
  
  #if !defined(ASIO_HAS_IOCP) \
    && !defined(ASIO_WINDOWS_RUNTIME)
  
  #include "asio/detail/reactive_socket_service_base.hpp"
  
  #include "asio/detail/push_options.hpp"
  
  namespace asio {
  namespace detail {
  
  reactive_socket_service_base::reactive_socket_service_base(
      asio::io_context& io_context)
    : io_context_(io_context),
      reactor_(use_service<reactor>(io_context))
  {
    reactor_.init_task();
  }
  
  void reactive_socket_service_base::base_shutdown()
  {
  }
  
  void reactive_socket_service_base::construct(
      reactive_socket_service_base::base_implementation_type& impl)
  {
    impl.socket_ = invalid_socket;
    impl.state_ = 0;
  }
  
  void reactive_socket_service_base::base_move_construct(
      reactive_socket_service_base::base_implementation_type& impl,
      reactive_socket_service_base::base_implementation_type& other_impl)
  {
    impl.socket_ = other_impl.socket_;
    other_impl.socket_ = invalid_socket;
  
    impl.state_ = other_impl.state_;
    other_impl.state_ = 0;
  
    reactor_.move_descriptor(impl.socket_,
        impl.reactor_data_, other_impl.reactor_data_);
  }
  
  void reactive_socket_service_base::base_move_assign(
      reactive_socket_service_base::base_implementation_type& impl,
      reactive_socket_service_base& other_service,
      reactive_socket_service_base::base_implementation_type& other_impl)
  {
    destroy(impl);
  
    impl.socket_ = other_impl.socket_;
    other_impl.socket_ = invalid_socket;
  
    impl.state_ = other_impl.state_;
    other_impl.state_ = 0;
  
    other_service.reactor_.move_descriptor(impl.socket_,
        impl.reactor_data_, other_impl.reactor_data_);
  }
  
  void reactive_socket_service_base::destroy(
      reactive_socket_service_base::base_implementation_type& impl)
  {
    if (impl.socket_ != invalid_socket)
    {
      ASIO_HANDLER_OPERATION((reactor_.context(),
            "socket", &impl, impl.socket_, "close"));
  
      reactor_.deregister_descriptor(impl.socket_, impl.reactor_data_,
          (impl.state_ & socket_ops::possible_dup) == 0);
  
      asio::error_code ignored_ec;
      socket_ops::close(impl.socket_, impl.state_, true, ignored_ec);
    }
  }
  
  asio::error_code reactive_socket_service_base::close(
      reactive_socket_service_base::base_implementation_type& impl,
      asio::error_code& ec)
  {
    if (is_open(impl))
    {
      ASIO_HANDLER_OPERATION((reactor_.context(),
            "socket", &impl, impl.socket_, "close"));
  
      reactor_.deregister_descriptor(impl.socket_, impl.reactor_data_,
          (impl.state_ & socket_ops::possible_dup) == 0);
    }
  
    socket_ops::close(impl.socket_, impl.state_, false, ec);
  
    // The descriptor is closed by the OS even if close() returns an error.
    //
    // (Actually, POSIX says the state of the descriptor is unspecified. On
    // Linux the descriptor is apparently closed anyway; e.g. see
    //   http://lkml.org/lkml/2005/9/10/129
    // We'll just have to assume that other OSes follow the same behaviour. The
    // known exception is when Windows's closesocket() function fails with
    // WSAEWOULDBLOCK, but this case is handled inside socket_ops::close().
    construct(impl);
  
    return ec;
  }
  
  socket_type reactive_socket_service_base::release(
      reactive_socket_service_base::base_implementation_type& impl,
      asio::error_code& ec)
  {
    if (!is_open(impl))
      return invalid_socket;
  
    cancel(impl, ec);
    if (ec)
      return invalid_socket;
  
    reactor_.deregister_descriptor(impl.socket_, impl.reactor_data_,
        (impl.state_ & socket_ops::possible_dup) == 0);
  
    socket_type tmp = impl.socket_;
    impl.socket_ = invalid_socket;
    return tmp;
  }
  
  asio::error_code reactive_socket_service_base::cancel(
      reactive_socket_service_base::base_implementation_type& impl,
      asio::error_code& ec)
  {
    if (!is_open(impl))
    {
      ec = asio::error::bad_descriptor;
      return ec;
    }
  
    ASIO_HANDLER_OPERATION((reactor_.context(),
          "socket", &impl, impl.socket_, "cancel"));
  
    reactor_.cancel_ops(impl.socket_, impl.reactor_data_);
    ec = asio::error_code();
    return ec;
  }
  
  asio::error_code reactive_socket_service_base::do_open(
      reactive_socket_service_base::base_implementation_type& impl,
      int af, int type, int protocol, asio::error_code& ec)
  {
    if (is_open(impl))
    {
      ec = asio::error::already_open;
      return ec;
    }
  
    socket_holder sock(socket_ops::socket(af, type, protocol, ec));
    if (sock.get() == invalid_socket)
      return ec;
  
    if (int err = reactor_.register_descriptor(sock.get(), impl.reactor_data_))
    {
      ec = asio::error_code(err,
          asio::error::get_system_category());
      return ec;
    }
  
    impl.socket_ = sock.release();
    switch (type)
    {
    case SOCK_STREAM: impl.state_ = socket_ops::stream_oriented; break;
    case SOCK_DGRAM: impl.state_ = socket_ops::datagram_oriented; break;
    default: impl.state_ = 0; break;
    }
    ec = asio::error_code();
    return ec;
  }
  
  asio::error_code reactive_socket_service_base::do_assign(
      reactive_socket_service_base::base_implementation_type& impl, int type,
      const reactive_socket_service_base::native_handle_type& native_socket,
      asio::error_code& ec)
  {
    if (is_open(impl))
    {
      ec = asio::error::already_open;
      return ec;
    }
  
    if (int err = reactor_.register_descriptor(
          native_socket, impl.reactor_data_))
    {
      ec = asio::error_code(err,
          asio::error::get_system_category());
      return ec;
    }
  
    impl.socket_ = native_socket;
    switch (type)
    {
    case SOCK_STREAM: impl.state_ = socket_ops::stream_oriented; break;
    case SOCK_DGRAM: impl.state_ = socket_ops::datagram_oriented; break;
    default: impl.state_ = 0; break;
    }
    impl.state_ |= socket_ops::possible_dup;
    ec = asio::error_code();
    return ec;
  }
  
  void reactive_socket_service_base::start_op(
      reactive_socket_service_base::base_implementation_type& impl,
      int op_type, reactor_op* op, bool is_continuation,
      bool is_non_blocking, bool noop)
  {
    if (!noop)
    {
      if ((impl.state_ & socket_ops::non_blocking)
          || socket_ops::set_internal_non_blocking(
            impl.socket_, impl.state_, true, op->ec_))
      {
        reactor_.start_op(op_type, impl.socket_,
            impl.reactor_data_, op, is_continuation, is_non_blocking);
        return;
      }
    }
  
    reactor_.post_immediate_completion(op, is_continuation);
  }
  
  void reactive_socket_service_base::start_accept_op(
      reactive_socket_service_base::base_implementation_type& impl,
      reactor_op* op, bool is_continuation, bool peer_is_open)
  {
    if (!peer_is_open)
      start_op(impl, reactor::read_op, op, true, is_continuation, false);
    else
    {
      op->ec_ = asio::error::already_open;
      reactor_.post_immediate_completion(op, is_continuation);
    }
  }
  
  void reactive_socket_service_base::start_connect_op(
      reactive_socket_service_base::base_implementation_type& impl,
      reactor_op* op, bool is_continuation,
      const socket_addr_type* addr, size_t addrlen)
  {
    if ((impl.state_ & socket_ops::non_blocking)
        || socket_ops::set_internal_non_blocking(
          impl.socket_, impl.state_, true, op->ec_))
    {
      if (socket_ops::connect(impl.socket_, addr, addrlen, op->ec_) != 0)
      {
        if (op->ec_ == asio::error::in_progress
            || op->ec_ == asio::error::would_block)
        {
          op->ec_ = asio::error_code();
          reactor_.start_op(reactor::connect_op, impl.socket_,
              impl.reactor_data_, op, is_continuation, false);
          return;
        }
      }
    }
  
    reactor_.post_immediate_completion(op, is_continuation);
  }
  
  } // namespace detail
  } // namespace asio
  
  #include "asio/detail/pop_options.hpp"
  
  #endif // !defined(ASIO_HAS_IOCP)
         //   && !defined(ASIO_WINDOWS_RUNTIME)
  
  #endif // ASIO_DETAIL_IMPL_REACTIVE_SOCKET_SERVICE_BASE_IPP
  