cpuTimePosix.C

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    Copyright (C) 2011-2014 OpenFOAM Foundation
    Copyright (C) 2018 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.
 
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    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
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#include "cpuTimePosix.H"
#include <unistd.h>
 
// * * * * * * * * * * * * * * * Static Members  * * * * * * * * * * * * * * //
 
// Clock-ticks per second
static const long clockTicks_(sysconf(_SC_CLK_TCK));
 
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
inline double Foam::cpuTimePosix::diff(const value_type& a, const value_type& b)
{
    return
    (
        double((a.tms_utime + a.tms_stime) - (b.tms_utime + b.tms_stime))
      / clockTicks_
    );
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::cpuTimePosix::value_type::value_type()
{
    update();
}
 
 
Foam::cpuTimePosix::cpuTimePosix()
:
    start_(),
    last_(start_)
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
void Foam::cpuTimePosix::value_type::update()
{
    ::times(this);
}
 
 
void Foam::cpuTimePosix::resetCpuTime()
{
    last_.update();
    start_ = last_;
}
 
 
double Foam::cpuTimePosix::elapsedCpuTime() const
{
    last_.update();
    return diff(last_, start_);
}
 
 
double Foam::cpuTimePosix::cpuTimeIncrement() const
{
    const value_type prev(last_);
    last_.update();
    return diff(last_, prev);
}
 
 
// ************************************************************************* //