src/lib/adapter/RPi/RPiCECAdapterMessageQueue.h

   1 #pragma once
   2 /*
   3  * This file is part of the libCEC(R) library.
   4  *
   5  * libCEC(R) is Copyright (C) 2011-2012 Pulse-Eight Limited.  All rights reserved.
   6  * libCEC(R) is an original work, containing original code.
   7  *
   8  * libCEC(R) is a trademark of Pulse-Eight Limited.
   9  *
  10  * This program is dual-licensed; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  *
  24  *
  25  * Alternatively, you can license this library under a commercial license,
  26  * please contact Pulse-Eight Licensing for more information.
  27  *
  28  * For more information contact:
  29  * Pulse-Eight Licensing       <license@pulse-eight.com>
  30  *     http://www.pulse-eight.com/
  31  *     http://www.pulse-eight.net/
  32  */
  33
  34 #include "lib/platform/util/buffer.h"
  35 #include <map>
  36
  37 namespace CEC
  38 {
  39   class CRPiCECAdapterCommunication;
  40   class CRPiCECAdapterMessageQueue;
  41
  42   class CRPiCECAdapterMessageQueueEntry
  43   {
  44   public:
  45     CRPiCECAdapterMessageQueueEntry(CRPiCECAdapterMessageQueue *queue, const cec_command &command);
  46     virtual ~CRPiCECAdapterMessageQueueEntry(void) {}
  47
  48     /*!
  49      * @brief Signal waiting threads
  50      */
  51     void Broadcast(void);
  52
  53     bool MessageReceived(cec_opcode opcode, cec_logical_address initiator, cec_logical_address destination, uint32_t response);
  54
  55     /*!
  56      * @brief Wait for a response to this command.
  57      * @param iTimeout The timeout to use while waiting.
  58      * @return True when a response was received before the timeout passed, false otherwise.
  59      */
  60     bool Wait(uint32_t iTimeout);
  61
  62     /*!
  63      * @return True while a thread is waiting for a signal or isn't waiting yet, false otherwise.
  64      */
  65     bool IsWaiting(void);
  66
  67     /*!
  68      * @return The command that was sent in human readable form.
  69      */
  70     const char *ToString(void) const { return "CEC transmission"; }
  71
  72     CRPiCECAdapterMessageQueue * m_queue;
  73     bool                         m_bWaiting;     /**< true while a thread is waiting or when it hasn't started waiting yet */
  74     PLATFORM::CCondition<bool>   m_condition;    /**< the condition to wait on */
  75     PLATFORM::CMutex             m_mutex;        /**< mutex for changes to this class */
  76     cec_command                  m_command;
  77     uint32_t                     m_retval;
  78     bool                         m_bSucceeded;
  79   };
  80
  81   class CRPiCECAdapterMessageQueue
  82   {
  83     friend class CRPiCECAdapterMessageQueueEntry;
  84
  85   public:
  86     /*!
  87      * @brief Create a new message queue.
  88      * @param com The communication handler callback to use.
  89      * @param iQueueSize The outgoing message queue size.
  90      */
  91     CRPiCECAdapterMessageQueue(CRPiCECAdapterCommunication *com) :
  92       m_com(com),
  93       m_iNextMessage(0)
  94     {
  95     }
  96
  97     virtual ~CRPiCECAdapterMessageQueue(void)
  98     {
  99       Clear();
 100     }
 101
 102     /*!
 103      * @brief Signal and delete everything in the queue
 104      */
 105     void Clear(void);
 106
 107     void MessageReceived(cec_opcode opcode, cec_logical_address initiator, cec_logical_address destination, uint32_t response);
 108
 109     bool Write(const cec_command &command, bool bIsReply);
 110
 111   private:
 112     CRPiCECAdapterCommunication *                             m_com;                    /**< the communication handler */
 113     PLATFORM::CMutex                                          m_mutex;                  /**< mutex for changes to this class */
 114     std::map<uint64_t, CRPiCECAdapterMessageQueueEntry *>     m_messages;               /**< the outgoing message queue */
 115     uint64_t                                                  m_iNextMessage;           /**< the index of the next message */
 116   };
 117 };