/*!

 * \copy

 *     Copyright (c)  2009-2015, Cisco Systems

 *     All rights reserved.

 *

 *     Redistribution and use in source and binary forms, with or without

 *     modification, are permitted provided that the following conditions

 *     are met:

 *

 *        * Redistributions of source code must retain the above copyright

 *          notice, this list of conditions and the following disclaimer.

 *

 *        * Redistributions in binary form must reproduce the above copyright

 *          notice, this list of conditions and the following disclaimer in

 *          the documentation and/or other materials provided with the

 *          distribution.

 *

 *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 *     "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 *     LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS

 *     FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

 *     COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,

 *     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,

 *     BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

 *     CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 *     LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

 *     ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 *     POSSIBILITY OF SUCH DAMAGE.

 *

 *

 * \file    WelsThreadPool.h

 *

 * \brief   Interfaces introduced in thread pool

 *

 * \date    5/09/2012 Created

 *

 *************************************************************************************

 */

#ifndef _WELS_THREAD_POOL_H_

#define _WELS_THREAD_POOL_H_

#include <stdio.h>

#include "WelsTask.h"

#include "WelsTaskThread.h"

#include "WelsList.h"

namespace WelsCommon {

class  CWelsThreadPool : public CWelsThread, public IWelsTaskThreadSink {

 public:

  enum {

    DEFAULT_THREAD_NUM = 4,

  };

  static WELS_THREAD_ERROR_CODE SetThreadNum (int32_t iMaxThreadNum);

  static CWelsThreadPool* AddReference();

  void RemoveInstance();

  static bool IsReferenced();

  //IWelsTaskThreadSink

  virtual WELS_THREAD_ERROR_CODE OnTaskStart (CWelsTaskThread* pThread,  IWelsTask* pTask);

  virtual WELS_THREAD_ERROR_CODE OnTaskStop (CWelsTaskThread* pThread,  IWelsTask* pTask);

  //  CWelsThread

  virtual void ExecuteTask();

  WELS_THREAD_ERROR_CODE  QueueTask (IWelsTask* pTask);

  int32_t        GetThreadNum() const {

    return m_iMaxThreadNum;

  }

 protected:

  WELS_THREAD_ERROR_CODE Init();

  WELS_THREAD_ERROR_CODE Uninit();

  WELS_THREAD_ERROR_CODE CreateIdleThread();

  void           DestroyThread (CWelsTaskThread* pThread);

  WELS_THREAD_ERROR_CODE AddThreadToIdleQueue (CWelsTaskThread* pThread);

  WELS_THREAD_ERROR_CODE AddThreadToBusyList (CWelsTaskThread* pThread);

  WELS_THREAD_ERROR_CODE RemoveThreadFromBusyList (CWelsTaskThread* pThread);

  bool           AddTaskToWaitedList (IWelsTask* pTask);

  CWelsTaskThread*   GetIdleThread();

  IWelsTask*         GetWaitedTask();

  int32_t            GetIdleThreadNum();

  int32_t            GetBusyThreadNum();

  int32_t            GetWaitedTaskNum();

  void               ClearWaitedTasks();

 private:

  CWelsThreadPool();

  virtual ~CWelsThreadPool();

  WELS_THREAD_ERROR_CODE StopAllRunning();

  static int32_t   m_iRefCount;

  static int32_t   m_iMaxThreadNum;

  static CWelsThreadPool* m_pThreadPoolSelf;

  CWelsNonDuplicatedList<IWelsTask>* m_cWaitedTasks;

  CWelsNonDuplicatedList<CWelsTaskThread>* m_cIdleThreads;

  CWelsList<CWelsTaskThread>* m_cBusyThreads;

  CWelsLock   m_cLockPool;

  CWelsLock   m_cLockWaitedTasks;

  CWelsLock   m_cLockIdleTasks;

  CWelsLock   m_cLockBusyTasks;

  DISALLOW_COPY_AND_ASSIGN (CWelsThreadPool);

};

}

#endif