ReadFields.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
     \\/     M anipulation  | Copyright (C) 2015 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM 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.
 
    OpenFOAM 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 OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
\*---------------------------------------------------------------------------*/
 
#include "ReadFields.H"
#include "HashSet.H"
#include "Pstream.H"
#include "IOobjectList.H"
 
// * * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * //
 
// Read all fields of type. Returns names of fields read. Guarantees all
// processors to read fields in same order.
Foam::wordList Foam::fieldNames
(
    const IOobjectList& fieldObjects,
    const bool syncPar
)
{
    // Get sorted field names. Sorting needed in parallel since different
    // processors (using different file servers) might pick up the files
    // in different order.
    wordList masterNames(fieldObjects.sortedNames());
 
    if (syncPar && Pstream::parRun())
    {
        // Check that I have the same fields as the master
        const wordList localNames(masterNames);
        Pstream::scatter(masterNames);
 
        HashSet<word> localNamesSet(localNames);
 
        forAll(masterNames, i)
        {
            const word& masterFld = masterNames[i];
 
            HashSet<word>::iterator iter = localNamesSet.find(masterFld);
 
            if (iter == localNamesSet.end())
            {
                FatalErrorInFunction
                    << "Fields not synchronised across processors." << endl
                    << "Master has fields " << masterNames
                    << "  processor " << Pstream::myProcNo()
                    << " has fields " << localNames << exit(FatalError);
            }
            else
            {
                localNamesSet.erase(iter);
            }
        }
 
        forAllConstIter(HashSet<word>, localNamesSet, iter)
        {
            FatalErrorInFunction
                << "Fields not synchronised across processors." << endl
                << "Master has fields " << masterNames
                << "  processor " << Pstream::myProcNo()
                << " has fields " << localNames << exit(FatalError);
        }
    }
 
    return masterNames;
}
 
 
// ************************************************************************* //