cpuTime.H

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
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::cpuTime
 
Description
    Starts timing CPU usage and return elapsed time from start.
 
SeeAlso
    clockTime
 
SourceFiles
    cpuTime.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef cpuTime_H
#define cpuTime_H
 
#include <time.h>
#include <sys/times.h>
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                           Class cpuTime Declaration
\*---------------------------------------------------------------------------*/
 
class cpuTime
{
    // Private data
 
        //- Time structure used
        typedef struct tms timeType;
 
        //- Clock-ticks per second
        static const long Hz_;
 
        //- The start time
        timeType startTime_;
        mutable timeType lastTime_;
        mutable timeType newTime_;
 
    // Private Member Functions
 
        //- Retrieve the current time values from the system
        static void getTime(timeType&);
 
        //- Difference between two times
        static double timeDifference(const timeType& beg, const timeType& end);
 
 
public:
 
    // Constructors
 
        //- Construct with the current clock time
        cpuTime();
 
 
    // Member Functions
 
        //- 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
 
// ************************************************************************* //