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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2018 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/>.
\*---------------------------------------------------------------------------*/
#include <unistd.h>
#include "error.H"
#include "timer.H"
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
namespace Foam
{
defineTypeNameAndDebug(timer, 0);
jmp_buf timer::envAlarm;
struct sigaction timer::oldAction_;
unsigned int timer::oldTimeOut_ = 0;
}
// * * * * * * * * * * * * * Static Member Functions * * * * * * * * * * * * //
void Foam::timer::signalHandler(int)
{
if (debug)
{
InfoInFunction<< "Timed out. Jumping."
<< endl;
}
longjmp(envAlarm, 1);
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
Foam::timer::timer(const unsigned int newTimeOut)
:
newTimeOut_(newTimeOut)
{
if (newTimeOut > 0)
{
// Is singleton since handler is static function
if (oldTimeOut_ != 0)
{
FatalErrorInFunction
<< "timer already used."
<< abort(FatalError);
}
// Install alarm signal handler:
// - do not block any signals while in it
// - clear list of signals to mask
struct sigaction newAction;
newAction.sa_handler = timer::signalHandler;
newAction.sa_flags = SA_NODEFER;
sigemptyset(&newAction.sa_mask);
if (sigaction(SIGALRM, &newAction, &oldAction_) < 0)
{
FatalErrorInFunction
<< "sigaction(SIGALRM) error"
<< abort(FatalError);
}
oldTimeOut_ = ::alarm(newTimeOut);
if (debug)
{
InfoInFunction
<< "Installing timeout " << int(newTimeOut_)
<< " seconds"
<< " (overriding old timeout " << int(oldTimeOut_)
<< ")." << endl;
}
}
}
// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
Foam::timer::~timer()
{
if (newTimeOut_ > 0)
{
if (debug)
{
InfoInFunction
<< "timeOut=" << int(newTimeOut_)
<< " : resetting timeOut to " << int(oldTimeOut_) << endl;
}
// Reset timer
::alarm(oldTimeOut_);
oldTimeOut_ = 0;
// Restore signal handler
if (sigaction(SIGALRM, &oldAction_, nullptr) < 0)
{
FatalErrorInFunction
<< "sigaction(SIGALRM) error"
<< abort(FatalError);
}
}
}
// ************************************************************************* //
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