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PsnMemoryManager.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 
 *
 */
#include "PsnMemoryManager.h"

#include "PsnMutexLock.h"
#include "PsnNew.h"
#include "PsnSystemMemoryManager.h"

list <PsnMemoryManager *> * PsnMemoryManager::getListOfMemoryManagers() 
{
   static list <PsnMemoryManager *> designPattern ; 
   return & designPattern ;
}

PsnMutexLock * PsnMemoryManager::getGlobalListMutex() 
{
   static PsnMutexLock toto ;
   return & toto ;
}


PsnMemoryManager * PsnMemoryManager::whichMemoryManager(void * ptr) 
{
   PsnMemoryManager * result = NULL ;
   getGlobalListMutex()->protect();   
   //cerr<<"PsnMemoryManager::whichMemoryManager :  getGlobalListMutex()->protect();"<<endl;
   list <PsnMemoryManager *>::iterator i =  getListOfMemoryManagers()->begin() ;
   while ( (result == NULL ) && (i != getListOfMemoryManagers()->end() ))
      {
#ifdef _DEBUGMEMORYMANAGEMENT
         assert ( (*i)->_isInitialized ) ;
#endif
         if ( (*i)->inAdressSpace (ptr) )
            {
               result = *i ;
            }
         else
            {
               ++i ;
            }
      }
   getGlobalListMutex()->unprotect();   
   if ( result == NULL)
      {
         result = HeapStackTop::getSystemMemoryManager() ;
      }

   return result ;
}


PsnMemoryManager::~PsnMemoryManager()
{
   // do the test, because removal of elements not present seem to bug some implementatiosn of the standard library
   if (_isInitialized)
      {
         getGlobalListMutex()->protect();   
         getListOfMemoryManagers()->remove( this ) ;
         getGlobalListMutex()->unprotect() ;
      }
   
   //when killing the last memory manager, some precautions have to be taken
   if ( this == pthread_getspecific( HeapStackTop::globalMemoryManagerKey ) )
      {
         pthread_setspecific ( HeapStackTop::globalMemoryManagerKey , NULL );
      }
}

PsnMemoryManager::PsnMemoryManager() :
   _isInitialized ( false )
{
}

void PsnMemoryManager::init()
{
   getGlobalListMutex()->protect();   
   getListOfMemoryManagers()->push_back( this ) ;
   getGlobalListMutex()->unprotect() ;
   _isInitialized = true ;
}

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