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PsnOnceSyncedSharedMemoryManager.cxx

Go to the documentation of this file.

/*
 * This file is part of openMask © INRIA, CNRS, Universite de Rennes 1 1993-2002, thereinafter the Software
 * 
 * The Software has been developped within the Siames Project. 
 * INRIA, the University of Rennes 1 and CNRS jointly hold intellectual property rights
 * 
 * The Software has been registered with the Agence pour la Protection des
 * Programmes (APP) under registration number IDDN.FR.001.510008.00.S.P.2001.000.41200
 *  
 * This file may be distributed under the terms of the Q Public License
 * version 1.0 as defined by Trolltech AS of Norway and appearing in the file
 * LICENSE.QPL included in the packaging of this file.
 *
 * Licensees holding valid specific licenses issued by INRIA, CNRS or Université de Rennes 1 
 * for the software may use this file in accordance with that specific license
 *
 */
#ifdef _MOME

#include "PsnOnceSyncedSharedMemoryManager.h"

#include "PsnRelaxedMemoryManager.h"
#include "PsnMemoryElementDescriptor.h"
#include "MomeDsm.h"
#include "iostream"

PsnOnceSyncedSharedMemoryManager::PsnOnceSyncedSharedMemoryManager(size_t sizeDsm, size_t pageSize, size_t alignedSize, PsnRelaxedMemoryManager & memoryManager, int queueSize) :
   PsnSecondarySharedMemoryManager(sizeDsm,
                                   pageSize,
                                   alignedSize,
                                   memoryManager),
   _sizeLeft(sizeDsm),
   _syncedAtLastSync(false),
   _toSyncAtNextSync(false)
{
   //because _firstPageOffset is used as the number of the pages used in memoryManager
   assert (_sizeDsm == _pageSize) ;
   _freeMem = new((PsnSharedMemoryManager *)NULL) PsnMemoryElementDescriptor() ;
   _freeMem->size = _sizeDsm ;
   _freeMem->base = 0 ;
   _freeMem->next = getAnInvalidOffset() ;
   memoryManager._whenSynced [ _firstPageOffset ] = -1 ;
}

PsnOnceSyncedSharedMemoryManager::~PsnOnceSyncedSharedMemoryManager() {

}

void PsnOnceSyncedSharedMemoryManager::sync() {
   if (_syncedAtLastSync && !_toSyncAtNextSync ) {
      _myMemoryManager._whenSynced [ _firstPageOffset ] = -1 ;
   }
   if (_toSyncAtNextSync) {
      _myMemoryManager._whenSynced [ _firstPageOffset ] = _myMemoryManager.getNextSyncedQueueIndex() ;
      _toSyncAtNextSync = false ;
      _syncedAtLastSync = true ;   
   }
}

void * PsnOnceSyncedSharedMemoryManager::getFromFree(size_t size) {
   void * resul = NULL ;
   if (size <= _sizeLeft ) resul = getFromThisFree(&_freeMem, size);
   if (resul != NULL) {
      _sizeLeft -= size ;
   }
   else {
#ifdef _DEBUGALLOCATIONMOME
      cerr<<"impossible de casser "<<size<<" dans "<<_sizeLeft<<endl;
#endif
   }
#ifdef _DEBUGALLOCATIONMOME
   cerr<<"PsnOnceSyncedSharedMemoryManager::getFromFree "<<size<<" "<<resul<<endl;
#endif
   return resul ;
}

void PsnOnceSyncedSharedMemoryManager::addInFree(void * ptr, size_t size) {
   addInThisFree(&_freeMem, globalAddressToLocal(ptr), size);
   _sizeLeft += size ;
}

#endif

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