cpuTimePosix.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2011-2014 OpenFOAM Foundation
    Copyright (C) 2018 OpenCFD Ltd.
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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::cpuTimePosix
 
Description
    Starts timing CPU usage and return elapsed time from start.
 
See also
    clockTime
 
SourceFiles
    cpuTimePosix.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef cpuTimePosix_H
#define cpuTimePosix_H
 
#include <string>
#include <ctime>
#include <sys/times.h>
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                           Class cpuTimePosix Declaration
\*---------------------------------------------------------------------------*/
 
class cpuTimePosix
{
    //- Time structure used, with additional methods
    struct value_type : tms
    {
        //- Construct with the current clock time
        value_type();
 
        //- Update with the current clock time
        void update();
    };
 
 
    // Private Data
 
        //- Start time, at the time of construction
        value_type start_;
 
        //- Last time when elapsedTime or timeIncrement was called
        mutable value_type last_;
 
 
    // Private Member Functions
 
        //- Difference between two times (a - b)
        inline static double diff(const value_type& a, const value_type& b);
 
 
public:
 
    // Constructors
 
        //- Construct with the current clock time
        cpuTimePosix();
 
 
    // Member Functions
 
        //- Reset to use the current time for the start time
        void resetCpuTime();
 
        //- Return CPU time (in seconds) from the start
        double elapsedCpuTime() const;
 
        //- Return CPU time (in seconds) since last call to cpuTimeIncrement()
        double cpuTimeIncrement() const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //