parRun.H

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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-------------------------------------------------------------------------------
    Copyright (C) 2011-2018 OpenFOAM Foundation
    Copyright (C) 2018-2021 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/>.
 
Class
    Foam::ParRunControl
 
Description
    Helper class for initializing parallel jobs from the command arguments,
    storing 'dry-run' state etc.
    Also handles cleanup of parallel (or serial) jobs.
 
Note
    In the meantime the class name may be slightly misleading.
 
\*---------------------------------------------------------------------------*/
 
#ifndef argListRunControl_H
#define argListRunControl_H
 
#include "Pstream.H"
#include "IOstreams.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                      Class ParRunControl Declaration
\*---------------------------------------------------------------------------*/
 
class ParRunControl
{
    int dryRun_;
    int verbose_;
    bool parallel_;
    bool distributed_;
 
public:
 
    //- Default construct
    ParRunControl()
    :
        dryRun_(0),
        verbose_(0),
        parallel_(false),
        distributed_(false)
    {}
 
    //- Destructor. Shutdown (finalize) MPI as required
    ~ParRunControl()
    {
        if (parallel_)
        {
            Info<< "Finalising parallel run" << endl;
        }
        UPstream::shutdown();
    }
 
 
    // Parallel Control
 
        //- Initialize Pstream for a parallel run
        void runPar(int& argc, char**& argv, bool needsThread)
        {
            if (!UPstream::init(argc, argv, needsThread))
            {
                Info<< "Failed to start parallel run" << endl;
                UPstream::exit(1);
            }
            parallel_ = true;
        }
 
 
        //- True if this is a parallel run
        bool parRun() const noexcept
        {
            return parallel_;
        }
 
        //- True if this is a parallel run and uses distributed roots.
        bool distributed() const noexcept
        {
            return (parallel_ && distributed_);
        }
 
        //- Set use of distributed roots, but only if actually parallel
        void distributed(bool on) noexcept
        {
            distributed_ = (parallel_ && on);
        }
 
 
    // General Control
 
        //- Non-zero if set as 'dry-run'
        int dryRun() const noexcept
        {
            return dryRun_;
        }
 
        //- Change 'dry-run', return old value
        int dryRun(const int level) noexcept
        {
            int old(dryRun_);
            dryRun_ = level;
            return old;
        }
 
        //- Non-zero if set as 'verbose'
        int verbose() const noexcept
        {
            return verbose_;
        }
 
        //- Change 'verbose', return old value
        int verbose(const int level) noexcept
        {
            int old(verbose_);
            verbose_ = level;
            return old;
        }
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //