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Stopwatch.cc
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Stopwatch.cc
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/// @copyright (c) 2009 CSIRO
/// Australia Telescope National Facility (ATNF)
/// Commonwealth Scientific and Industrial Research Organisation (CSIRO)
/// PO Box 76, Epping NSW 1710, Australia
///
/// The ASKAP software distribution 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 2 of the License,
/// or (at your option) any later version.
///
/// This program 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 this program; if not, write to the Free Software
/// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
///
/// @author Ben Humphreys <[email protected]>
// Include own header file first
#include "Stopwatch.h"
// System includes
#include <unistd.h>
#include <sys/times.h>
#include <stdexcept>
Stopwatch::Stopwatch() : m_start(static_cast<clock_t>(-1))
{
}
Stopwatch::~Stopwatch()
{
}
void Stopwatch::start()
{
struct tms t;
m_start = times(&t);
if (m_start == static_cast<clock_t>(-1)) {
throw std::runtime_error("Error calling times()");
}
}
double Stopwatch::stop()
{
struct tms t;
const clock_t stop = times(&t);
if (m_start == static_cast<clock_t>(-1)) {
throw std::runtime_error("Start time not set");
}
if (stop == static_cast<clock_t>(-1)) {
throw std::runtime_error("Error calling times()");
}
return (static_cast<double>(stop - m_start)) / (static_cast<double>(sysconf(_SC_CLK_TCK)));
}