polyMeshGenAddressingEdges.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | cfMesh: A library for mesh generation
   \\    /   O peration     |
    \\  /    A nd           | Copyright held by the original author
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of cfMesh.
 
    cfMesh is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
    Free Software Foundation; either version 3 of the License, or (at your
    option) any later version.
 
    cfMesh is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with cfMesh.  If not, see <http://www.gnu.org/licenses/>.
 
\*---------------------------------------------------------------------------*/
 
#include "polyMeshGenAddressing.H"
#include "DynList.H"
#include "helperFunctions.H"
#include "demandDrivenData.H"
 
# ifdef USE_OMP
#include <omp.h>
# endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
void polyMeshGenAddressing::calcEdges() const
{
    if( edgesPtr_ )
    {
        FatalErrorIn("polyMeshGenAddressing::calcEdges() const")
            << "edges already calculated"
            << abort(FatalError);
    }
    else
    {
        const faceListPMG& faces = mesh_.faces();
        const VRWGraph& pointFaces = this->pointFaces();
 
        edgesPtr_ = new edgeList();
        label nEdges(0);
        labelList nfe(faces.size());
 
        # ifdef USE_OMP
        const label nThreads = 3 * omp_get_num_procs();
        labelList nEdgesForThread(nThreads);
        # else
        labelList nEdgesForThread(1);
        # endif
 
        # ifdef USE_OMP
        # pragma omp parallel num_threads(nThreads) if( faces.size() > 1000 )
        # endif
        {
            LongList<edge> edgesHelper;
 
            # ifdef USE_OMP
            # pragma omp for schedule(static)
            # endif
            forAll(faces, faceI)
            {
                const face& f = faces[faceI];
 
                forAll(f, pI)
                {
                    const edge fe = f.faceEdge(pI);
                    const label s = fe.start();
                    const label e = fe.end();
 
                    DynList<label> edgeFaces;
 
                    bool store(true);
 
                    //- find all faces attached to this edge
                    //- store the edge in case the face faceI is the face
                    //- with the smallest label
                    forAllRow(pointFaces, s, pfI)
                    {
                        const label ofI = pointFaces(s, pfI);
                        const face& of = faces[ofI];
 
                        if( of.which(e) < 0 )
                            continue;
                        if( ofI < faceI )
                        {
                            store = false;
                            break;
                        }
 
                        edgeFaces.append(ofI);
                    }
 
                    if( store )
                        edgesHelper.append(fe);
                }
            }
 
            //- this enables other threads to see the number of edges
            //- generated by each thread
            # ifdef USE_OMP
            nEdgesForThread[omp_get_thread_num()] = edgesHelper.size();
            # else
            nEdgesForThread[0] = edgesHelper.size();
            # endif
 
            # ifdef USE_OMP
            # pragma omp critical
            # endif
            nEdges += edgesHelper.size();
 
            # ifdef USE_OMP
            # pragma omp barrier
 
            # pragma omp master
            # endif
            edgesPtr_->setSize(nEdges);
 
            # ifdef USE_OMP
            # pragma omp barrier
            # endif
 
            //- find the starting position of the edges generated by this thread
            //- in the global list of edges
            label localStart(0);
            # ifdef USE_OMP
            const label threadI = omp_get_thread_num();
            # else
            const label threadI = 0;
            # endif
            for(label i=0;i<threadI;++i)
                localStart += nEdgesForThread[i];
 
            //- store edges into the global list
            forAll(edgesHelper, i)
                edgesPtr_->operator[](localStart+i) = edgesHelper[i];
        }
    }
}
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
const edgeList& polyMeshGenAddressing::edges() const
{
    if( !edgesPtr_ )
    {
        # ifdef USE_OMP
        if( omp_in_parallel() )
            FatalErrorIn
            (
                "const edgeList& polyMeshGenAddressing::edges() const"
            ) << "Calculating addressing inside a parallel region."
                << " This is not thread safe" << exit(FatalError);
        # endif
 
        calcEdges();
    }
 
    return *edgesPtr_;
}
 
void polyMeshGenAddressing::clearOutEdges()
{
    deleteDemandDrivenData(edgesPtr_);
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// ************************************************************************* //