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+//
+// detail/reactive_socket_service_base.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2010 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_REACTIVE_SOCKET_SERVICE_BASE_HPP
+#define BOOST_ASIO_DETAIL_REACTIVE_SOCKET_SERVICE_BASE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+
+#if !defined(BOOST_ASIO_HAS_IOCP)
+
+#include <boost/utility/addressof.hpp>
+#include <boost/asio/buffer.hpp>
+#include <boost/asio/error.hpp>
+#include <boost/asio/io_service.hpp>
+#include <boost/asio/socket_base.hpp>
+#include <boost/asio/detail/buffer_sequence_adapter.hpp>
+#include <boost/asio/detail/reactive_null_buffers_op.hpp>
+#include <boost/asio/detail/reactive_socket_recv_op.hpp>
+#include <boost/asio/detail/reactive_socket_send_op.hpp>
+#include <boost/asio/detail/reactor.hpp>
+#include <boost/asio/detail/reactor_op.hpp>
+#include <boost/asio/detail/socket_holder.hpp>
+#include <boost/asio/detail/socket_ops.hpp>
+#include <boost/asio/detail/socket_types.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+class reactive_socket_service_base
+{
+public:
+  // The native type of a socket.
+  typedef socket_type native_type;
+
+  // The implementation type of the socket.
+  struct base_implementation_type
+  {
+    // The native socket representation.
+    socket_type socket_;
+
+    // The current state of the socket.
+    socket_ops::state_type state_;
+
+    // Per-descriptor data used by the reactor.
+    reactor::per_descriptor_data reactor_data_;
+  };
+
+  // Constructor.
+  BOOST_ASIO_DECL reactive_socket_service_base(
+      boost::asio::io_service& io_service);
+
+  // Destroy all user-defined handler objects owned by the service.
+  BOOST_ASIO_DECL void shutdown_service();
+
+  // Construct a new socket implementation.
+  BOOST_ASIO_DECL void construct(base_implementation_type& impl);
+
+  // Destroy a socket implementation.
+  BOOST_ASIO_DECL void destroy(base_implementation_type& impl);
+
+  // Determine whether the socket is open.
+  bool is_open(const base_implementation_type& impl) const
+  {
+    return impl.socket_ != invalid_socket;
+  }
+
+  // Destroy a socket implementation.
+  BOOST_ASIO_DECL boost::system::error_code close(
+      base_implementation_type& impl, boost::system::error_code& ec);
+
+  // Get the native socket representation.
+  native_type native(base_implementation_type& impl)
+  {
+    return impl.socket_;
+  }
+
+  // Cancel all operations associated with the socket.
+  BOOST_ASIO_DECL boost::system::error_code cancel(
+      base_implementation_type& impl, boost::system::error_code& ec);
+
+  // Determine whether the socket is at the out-of-band data mark.
+  bool at_mark(const base_implementation_type& impl,
+      boost::system::error_code& ec) const
+  {
+    return socket_ops::sockatmark(impl.socket_, ec);
+  }
+
+  // Determine the number of bytes available for reading.
+  std::size_t available(const base_implementation_type& impl,
+      boost::system::error_code& ec) const
+  {
+    return socket_ops::available(impl.socket_, ec);
+  }
+
+  // Place the socket into the state where it will listen for new connections.
+  boost::system::error_code listen(base_implementation_type& impl,
+      int backlog, boost::system::error_code& ec)
+  {
+    socket_ops::listen(impl.socket_, backlog, ec);
+    return ec;
+  }
+
+  // Perform an IO control command on the socket.
+  template <typename IO_Control_Command>
+  boost::system::error_code io_control(base_implementation_type& impl,
+      IO_Control_Command& command, boost::system::error_code& ec)
+  {
+    socket_ops::ioctl(impl.socket_, impl.state_, command.name(),
+        static_cast<ioctl_arg_type*>(command.data()), ec);
+    return ec;
+  }
+
+  /// Disable sends or receives on the socket.
+  boost::system::error_code shutdown(base_implementation_type& impl,
+      socket_base::shutdown_type what, boost::system::error_code& ec)
+  {
+    socket_ops::shutdown(impl.socket_, what, ec);
+    return ec;
+  }
+
+  // Send the given data to the peer.
+  template <typename ConstBufferSequence>
+  size_t send(base_implementation_type& impl,
+      const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, boost::system::error_code& ec)
+  {
+    buffer_sequence_adapter<boost::asio::const_buffer,
+        ConstBufferSequence> bufs(buffers);
+
+    return socket_ops::sync_send(impl.socket_, impl.state_,
+        bufs.buffers(), bufs.count(), flags, bufs.all_empty(), ec);
+  }
+
+  // Wait until data can be sent without blocking.
+  size_t send(base_implementation_type& impl, const null_buffers&,
+      socket_base::message_flags, boost::system::error_code& ec)
+  {
+    // Wait for socket to become ready.
+    socket_ops::poll_write(impl.socket_, ec);
+
+    return 0;
+  }
+
+  // Start an asynchronous send. The data being sent must be valid for the
+  // lifetime of the asynchronous operation.
+  template <typename ConstBufferSequence, typename Handler>
+  void async_send(base_implementation_type& impl,
+      const ConstBufferSequence& buffers,
+      socket_base::message_flags flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef reactive_socket_send_op<ConstBufferSequence, Handler> op;
+    typename op::ptr p = { boost::addressof(handler),
+      boost_asio_handler_alloc_helpers::allocate(
+        sizeof(op), handler), 0 };
+    p.p = new (p.v) op(impl.socket_, buffers, flags, handler);
+
+    start_op(impl, reactor::write_op, p.p, true,
+        ((impl.state_ & socket_ops::stream_oriented)
+          && buffer_sequence_adapter<boost::asio::const_buffer,
+            ConstBufferSequence>::all_empty(buffers)));
+    p.v = p.p = 0;
+  }
+
+  // Start an asynchronous wait until data can be sent without blocking.
+  template <typename Handler>
+  void async_send(base_implementation_type& impl, const null_buffers&,
+      socket_base::message_flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef reactive_null_buffers_op<Handler> op;
+    typename op::ptr p = { boost::addressof(handler),
+      boost_asio_handler_alloc_helpers::allocate(
+        sizeof(op), handler), 0 };
+    p.p = new (p.v) op(handler);
+
+    start_op(impl, reactor::write_op, p.p, false, false);
+    p.v = p.p = 0;
+  }
+
+  // Receive some data from the peer. Returns the number of bytes received.
+  template <typename MutableBufferSequence>
+  size_t receive(base_implementation_type& impl,
+      const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, boost::system::error_code& ec)
+  {
+    buffer_sequence_adapter<boost::asio::mutable_buffer,
+        MutableBufferSequence> bufs(buffers);
+
+    return socket_ops::sync_recv(impl.socket_, impl.state_,
+        bufs.buffers(), bufs.count(), flags, bufs.all_empty(), ec);
+  }
+
+  // Wait until data can be received without blocking.
+  size_t receive(base_implementation_type& impl, const null_buffers&,
+      socket_base::message_flags, boost::system::error_code& ec)
+  {
+    // Wait for socket to become ready.
+    socket_ops::poll_read(impl.socket_, ec);
+
+    return 0;
+  }
+
+  // Start an asynchronous receive. The buffer for the data being received
+  // must be valid for the lifetime of the asynchronous operation.
+  template <typename MutableBufferSequence, typename Handler>
+  void async_receive(base_implementation_type& impl,
+      const MutableBufferSequence& buffers,
+      socket_base::message_flags flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef reactive_socket_recv_op<MutableBufferSequence, Handler> op;
+    typename op::ptr p = { boost::addressof(handler),
+      boost_asio_handler_alloc_helpers::allocate(
+        sizeof(op), handler), 0 };
+    p.p = new (p.v) op(impl.socket_, impl.state_, buffers, flags, handler);
+
+    start_op(impl,
+        (flags & socket_base::message_out_of_band)
+          ? reactor::except_op : reactor::read_op,
+        p.p, (flags & socket_base::message_out_of_band) == 0,
+        ((impl.state_ & socket_ops::stream_oriented)
+          && buffer_sequence_adapter<boost::asio::mutable_buffer,
+            MutableBufferSequence>::all_empty(buffers)));
+    p.v = p.p = 0;
+  }
+
+  // Wait until data can be received without blocking.
+  template <typename Handler>
+  void async_receive(base_implementation_type& impl, const null_buffers&,
+      socket_base::message_flags flags, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef reactive_null_buffers_op<Handler> op;
+    typename op::ptr p = { boost::addressof(handler),
+      boost_asio_handler_alloc_helpers::allocate(
+        sizeof(op), handler), 0 };
+    p.p = new (p.v) op(handler);
+
+    start_op(impl,
+        (flags & socket_base::message_out_of_band)
+          ? reactor::except_op : reactor::read_op,
+        p.p, false, false);
+    p.v = p.p = 0;
+  }
+
+protected:
+  // Open a new socket implementation.
+  BOOST_ASIO_DECL boost::system::error_code do_open(
+      base_implementation_type& impl, int af,
+      int type, int protocol, boost::system::error_code& ec);
+
+  // Assign a native socket to a socket implementation.
+  BOOST_ASIO_DECL boost::system::error_code do_assign(
+      base_implementation_type& impl, int type,
+      const native_type& native_socket, boost::system::error_code& ec);
+
+  // Start the asynchronous read or write operation.
+  BOOST_ASIO_DECL void start_op(base_implementation_type& impl, int op_type,
+      reactor_op* op, bool non_blocking, bool noop);
+
+  // Start the asynchronous accept operation.
+  BOOST_ASIO_DECL void start_accept_op(base_implementation_type& impl,
+      reactor_op* op, bool peer_is_open);
+
+  // Start the asynchronous connect operation.
+  BOOST_ASIO_DECL void start_connect_op(base_implementation_type& impl,
+      reactor_op* op, const socket_addr_type* addr, size_t addrlen);
+
+  // The selector that performs event demultiplexing for the service.
+  reactor& reactor_;
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#if defined(BOOST_ASIO_HEADER_ONLY)
+# include <boost/asio/detail/impl/reactive_socket_service_base.ipp>
+#endif // defined(BOOST_ASIO_HEADER_ONLY)
+
+#endif // !defined(BOOST_ASIO_HAS_IOCP)
+
+#endif // BOOST_ASIO_DETAIL_REACTIVE_SOCKET_SERVICE_BASE_HPP