gmpFemLocker.h

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/************************************************************************
**
** Copyright (C) 2014 by Carlos Augusto Teixera Mendes
** All rights reserved.
**
** This file is part of the "GeMA" software. It's use should respect
** the terms in the license agreement that can be found together
** with this source code.
** It is provided AS IS, with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE.
**
************************************************************************/

#ifndef _GEMA_PLUGIN_FEM_LOCKER_H_
#define _GEMA_PLUGIN_FEM_LOCKER_H_

#include "gmpFemProcessConfig.h"

#include <gmSpinLock.h>

#include <QVector>

class GmElementMesh;

class GMP_FEM_PROCESS_API_EXPORT GmpFemLocker 
{
public:
  GmpFemLocker() { assert(GmThreadManager::inMainThread()); _psize = _npart = 0; }

  ~GmpFemLocker() { assert(GmThreadManager::inMainThread());  qDeleteAll(_lockList); }

  void setNumPartitions(int numdof, int npart) 
  { 
    assert(npart && numdof); 
    assert(GmThreadManager::inMainThread());

    if(npart + 1 > _lockList.size())
    {
      _lockList.resize(npart + 1); // + 1 for the negative values lock 
      for(int i = _npart; i < npart + 1; i++)
        _lockList[i] = new GmSpinLock;
    }
    _npart = npart + 1;  
    _psize = (numdof+npart-1) / npart; 
  }

  int numPartitions() const { return _npart - 1; }

  void lockDof(int dofIndex) { _lockList[dofToLockIndex(dofIndex)]->lock(); }

  void unlockDof(int dofIndex) { _lockList[dofToLockIndex(dofIndex)]->unlock(); }

private:
  Q_DISABLE_COPY(GmpFemLocker)

  
  int dofToLockIndex(int dofIndex) 
  { 
    assert(_psize && _npart);
    assert(_npart <= _lockList.size());
    int r = (dofIndex < 0) ? 0 : (dofIndex / _psize) + 1; 
    assert(r >= 0 && r < _npart);
    return r;
  }

  int                  _psize;    
  int                  _npart;    
  QVector<GmSpinLock*> _lockList; 
};


#endif