clientpq.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 

/****************************************************************************
 * 
 * Client side Priority Queue Time-Based Scheduler.
 * Out there protecting the world!
 *
 */

#include "clientpq.h"
#include "hxthread.h"

#include "hxheap.h"
#ifdef _DEBUG
#undef HX_THIS_FILE		
static const char HX_THIS_FILE[] = __FILE__;
#endif

ClientPQ::ClientPQ(CHXID* pIds)
    : PQ(pIds),
      m_pFreeList(NULL),
      m_uNumFreeNodes(0),
      m_uNumNodesToCache(DEFAULT_NODE_CACHE_SIZE),
      m_pMutex(NULL)
{
#if defined(THREADS_SUPPORTED) || defined(_UNIX_THREADS_SUPPORTED)
    HXMutex::MakeMutex(m_pMutex);
#else
    HXMutex::MakeStubMutex(m_pMutex);
#endif
}


ClientPQ::~ClientPQ()
{
    while(m_pFreeList)
    {
	PQElem* pElem = m_pFreeList;
	m_pFreeList = m_pFreeList->m_pNext;
	delete pElem;
    }
    HX_DELETE(m_pMutex);
}


int ClientPQ::execute(Timeval now)
{
    int     nCount = 0;
    PQElem* pElem  = NULL;
    
    //Protect just the _remove_head call with the mutex.
    m_pMutex->Lock();
    pElem = PQ::get_execute_list(now);

    PQElem* pElemNext = NULL;
    while (pElem) 
    {
        // synch with remove.
        pElem->m_bRemoved = TRUE;

        if(!pElem->m_bDefunct)
            nCount++;

        m_pMutex->Unlock();
        pElemNext = PQ::dispatch_element(pElem);
        m_pMutex->Lock();
        
        PQ::destroy_element(pElem);

        if (!pElemNext)
            break;
        pElem = pElemNext; 
    }

    m_pMutex->Unlock();

    return nCount;
}

UINT32 ClientPQ::enter(Timeval tmVal, IHXCallback* pCallBack)
{
    UINT32 unRetVal = 0;
    m_pMutex->Lock();
    unRetVal = PQ::enter(tmVal, pCallBack);
    m_pMutex->Unlock();
    return unRetVal;
}

BOOL ClientPQ::removeifexists(UINT32 id)
{
    BOOL bReturn = FALSE;

    m_pMutex->Lock();
    
    PQElem* pElem = (PQElem*)m_pIds->get(id);
    if( pElem && !pElem->m_bRemoved)
    {
        bReturn = PQ::removeifexists(id);
        pElem->m_bRemoved = bReturn;
    }

    m_pMutex->Unlock();
    
    return bReturn;    
}   

void
ClientPQ::remove(UINT32 id)
{
    m_pMutex->Lock();

    PQElem* pElem = (PQElem*)m_pIds->get(id);

    if (pElem && !pElem->m_bRemoved)
    {
        HX_VERIFY(PQ::removeifexists(id) == TRUE);
        pElem->m_bRemoved = 1;
    }

    m_pMutex->Unlock();

    //HX_VERIFY(removeifexists(id) == TRUE);
}