/usr/include/dune/grid/uggrid/ugmessagebuffer.hh is in libdune-grid-dev 2.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// vi: set et ts=4 sw=2 sts=2:
#ifndef UG_MESSAGE_BUFFER_HH
#define UG_MESSAGE_BUFFER_HH
#include <algorithm>
#include <dune/common/parallel/mpihelper.hh>
#include <dune/grid/common/gridenums.hh>
namespace Dune {
/** converts the UG speak message buffers to DUNE speak and vice-versa */
template <class DataHandle, int GridDim, int codim>
class UGMessageBufferBase {
protected:
typedef UGMessageBufferBase<DataHandle, GridDim, codim> ThisType;
typedef UGGrid<GridDim> GridType;
typedef typename DataHandle::DataType DataType;
enum {
dim = GridDim
};
UGMessageBufferBase(void *ugData)
{
ugData_ = static_cast<char*>(ugData);
};
public:
void write(const DataType &t)
{ this->writeRaw_<DataType>(t); }
void read(DataType &t)
{ this->readRaw_<DataType>(t); }
protected:
friend class Dune::UGGrid<dim>;
template <class ValueType>
void writeRaw_(const ValueType &v)
{
*reinterpret_cast<ValueType*>(ugData_) = v;
ugData_ += sizeof(ValueType);
}
template <class ValueType>
void readRaw_(ValueType &v)
{
v = *reinterpret_cast<ValueType*>(ugData_);
ugData_ += sizeof(ValueType);
}
// called by DDD_IFOneway to serialize the data structure to
// be send
static int ugGather_(typename UG_NS<dim>::DDD_OBJ obj, void* data)
{
// cast the DDD object to a UG entity pointer
typedef typename Dune::UG_NS<dim>::template Entity<codim>::T* UGEntityPointer;
UGEntityPointer ugEP = reinterpret_cast<typename Dune::UG_NS<dim>::template Entity<codim>::T*>(obj);
// construct a DUNE makeable entity from the UG entity pointer
/** \bug The nullptr argument should actually the UGGrid object. But that is hard to obtain here,
* and the argument is (currently) only used for the boundarySegmentIndex method, which we don't call. */
typedef UGMakeableEntity<codim, dim, UGGrid<dim> > DuneMakeableEntity;
DuneMakeableEntity entity(ugEP, nullptr);
// safety check to only communicate what is needed
if ((level == -1 && UG_NS<dim>::isLeaf(ugEP)) || entity.level() == level)
{
ThisType msgBuf(static_cast<DataType*>(data));
if (!duneDataHandle_->fixedsize(dim, codim))
msgBuf.template writeRaw_<unsigned>(duneDataHandle_->size(entity));
duneDataHandle_->gather(msgBuf, entity);
}
return 0;
}
// called by DDD_IFOneway to deserialize the data structure
// that has been received
static int ugScatter_(typename UG_NS<dim>::DDD_OBJ obj, void* data)
{
// cast the DDD object to a UG entity pointer
typedef typename Dune::UG_NS<dim>::template Entity<codim>::T* UGEntityPointer;
UGEntityPointer ugEP = reinterpret_cast<typename Dune::UG_NS<dim>::template Entity<codim>::T*>(obj);
// construct a DUNE makeable entity from the UG entity pointer
/** \bug The nullptr argument should actually the UGGrid object. But that is hard to obtain here,
* and the argument is (currently) only used for the boundarySegmentIndex method, which we don't call. */
typedef UGMakeableEntity<codim, dim, UGGrid<dim> > DuneMakeableEntity;
DuneMakeableEntity entity(ugEP, nullptr);
// safety check to only communicate what is needed
if ((level == -1 && UG_NS<dim>::isLeaf(ugEP)) || entity.level() == level)
{
ThisType msgBuf(static_cast<DataType*>(data));
int size;
if (!duneDataHandle_->fixedsize(dim, codim))
msgBuf.readRaw_(size);
else
size = duneDataHandle_->template size<DuneMakeableEntity>(entity);
if (size > 0)
duneDataHandle_->template scatter<ThisType, DuneMakeableEntity>(msgBuf, entity, size);
}
return 0;
}
static DataHandle *duneDataHandle_;
static int level;
char *ugData_;
};
template <class DataHandle, int GridDim, int codim>
class UGMessageBuffer
: public UGMessageBufferBase<DataHandle, GridDim, codim>
{
typedef typename DataHandle::DataType DataType;
typedef UGMessageBufferBase<DataHandle, GridDim, codim> Base;
enum { dim = GridDim };
protected:
friend class Dune::UGGrid<dim>;
UGMessageBuffer(void *ugData)
: Base(ugData)
{}
// returns number of bytes required for the UG message buffer
template <class GridView>
static unsigned ugBufferSize_(const GridView &gv)
{
if (Base::duneDataHandle_->fixedsize(dim, codim)) {
return sizeof(DataType)
* Base::duneDataHandle_->size(*gv.template begin<codim,InteriorBorder_Partition>());
}
// iterate over all entities, find the maximum size for
// the current rank
int maxSize = 0;
typedef typename
GridView
::template Codim<codim>
::template Partition<Dune::All_Partition>
::Iterator Iterator;
Iterator it = gv.template begin<codim, Dune::All_Partition>();
const Iterator endIt = gv.template end<codim, Dune::All_Partition>();
for (; it != endIt; ++it) {
maxSize = std::max((int) maxSize,
(int) Base::duneDataHandle_->size(*it));
}
// find maximum size for all ranks
maxSize = MPIHelper::getCollectiveCommunication().max(maxSize);
if (!maxSize)
return 0;
// add the size of an unsigned integer to the actual
// buffer size. (we somewhere have to store the actual
// number of objects for each entity.)
return sizeof(unsigned) + sizeof(DataType)*maxSize;
}
};
template <class DataHandle, int GridDim, int codim>
class UGEdgeAndFaceMessageBuffer
: public UGMessageBufferBase<DataHandle, GridDim, codim>
{
enum {dim = GridDim};
typedef typename DataHandle::DataType DataType;
typedef UGMessageBufferBase<DataHandle, GridDim, codim> Base;
protected:
friend class Dune::UGGrid<dim>;
UGEdgeAndFaceMessageBuffer(void *ugData)
: Base(ugData)
{}
// returns number of bytes required for the UG message buffer
template <class GridView>
static unsigned ugBufferSize_(const GridView &gv)
{
if (Base::duneDataHandle_->fixedsize(dim, codim)) {
typedef typename GridView::template Codim<0>::template Partition<InteriorBorder_Partition>::Iterator ElementIterator;
ElementIterator element = gv.template begin<0, InteriorBorder_Partition>();
return sizeof(DataType)
* Base::duneDataHandle_->size(element->template subEntity<codim>(0));
}
// iterate over all entities, find the maximum size for
// the current rank
int maxSize = 0;
typedef typename
GridView
::template Codim<0>
::template Partition<Dune::All_Partition>
::Iterator Iterator;
Iterator it = gv.template begin<0, Dune::All_Partition>();
const Iterator endIt = gv.template end<0, Dune::All_Partition>();
for (; it != endIt; ++it) {
int numberOfSubentities = it->subEntities(codim);
for (int k = 0; k < numberOfSubentities; k++)
{
typedef typename GridView::template Codim<0>::Entity Element;
typedef typename Element::template Codim<codim>::Entity SubEntity;
const SubEntity subEntity(it->template subEntity<codim>(k));
maxSize = std::max((int) maxSize,
(int) Base::duneDataHandle_->size(subEntity));
}
}
// find maximum size for all ranks
maxSize = MPIHelper::getCollectiveCommunication().max(maxSize);
if (!maxSize)
return 0;
// add the size of an unsigned integer to the actual
// buffer size. (we somewhere have to store the actual
// number of objects for each entity.)
return sizeof(unsigned) + sizeof(DataType)*maxSize;
}
};
template <class DataHandle>
class UGMessageBuffer<DataHandle, 2, 1>
: public UGEdgeAndFaceMessageBuffer<DataHandle, 2, 1>
{};
template <class DataHandle>
class UGMessageBuffer<DataHandle, 3, 2>
: public UGEdgeAndFaceMessageBuffer<DataHandle, 3, 2>
{};
template <class DataHandle>
class UGMessageBuffer<DataHandle, 3, 1>
: public UGEdgeAndFaceMessageBuffer<DataHandle, 3, 1>
{};
} // end namespace Dune
#endif // UG_MESSAGE_BUFFER_HH
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