shared_memory_connection.h

/*
   Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#ifndef SHARED_MEMORY_CONNECTION_INCLUDED
#define SHARED_MEMORY_CONNECTION_INCLUDED

#include "my_global.h"               // uint

#include <string>
#include <Windows.h>

class Channel_info;
class THD;


/**
  This class abstract a shared memory listener to listen for connection
  events that connect via the shared memory.
*/
class Shared_mem_listener
{
  std::string m_shared_mem_name;
  HANDLE m_connect_file_map;
  char* m_connect_map;
  HANDLE m_connect_named_mutex;
  HANDLE m_event_connect_request;
  HANDLE m_event_connect_answer;
  SECURITY_ATTRIBUTES *m_sa_event;
  SECURITY_ATTRIBUTES *m_sa_mapping;
  int m_connect_number;
  char *m_suffix_pos;
  char *m_temp_buffer;

  HANDLE m_handle_client_file_map;
  char  *m_handle_client_map;
  HANDLE m_event_client_wrote;
  HANDLE m_event_client_read;    // for transfer data server <-> client
  HANDLE m_event_server_wrote;
  HANDLE m_event_server_read;
  HANDLE m_event_conn_closed;

  void close_shared_mem();

public:
  /**
    Constructor to create shared memory listener.

    @param  shared_memory_base_name pointer to shared memory base name.
  */
  Shared_mem_listener(const std::string *shared_memory_base_name)
  : m_shared_mem_name(*shared_memory_base_name),
    m_connect_file_map(0),
    m_connect_map(0),
    m_connect_named_mutex(NULL),
    m_event_connect_request(0),
    m_event_connect_answer(0),
    m_sa_event(0),
    m_sa_mapping(0),
    m_temp_buffer(0),
    m_connect_number(1),
    m_handle_client_file_map(0),
    m_handle_client_map(0),
    m_event_client_wrote(0),
    m_event_client_read(0),
    m_event_server_wrote(0),
    m_event_server_read(0),
    m_event_conn_closed(0)
  { }

  /**
    Set up a listener.

    @retval false listener listener has been setup successfully to listen for connect events
            true  failure in setting up the listener.
  */
  bool setup_listener();

  /**
    The body of the event loop that listen for connection events from clients.

    @retval Channel_info   Channel_info object abstracting the connected client
                           details for processing this connection.
  */
  Channel_info* listen_for_connection_event();

  /**
    Close the listener.
  */
  void close_listener();
};

#endif // SHARED_MEMORY_CONNECTION_INCLUDED