/* FasTC
 * Copyright (c) 2012 University of North Carolina at Chapel Hill. All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its documentation for educational, 
 * research, and non-profit purposes, without fee, and without a written agreement is hereby granted, 
 * provided that the above copyright notice, this paragraph, and the following four paragraphs appear 
 * in all copies.
 *
 * Permission to incorporate this software into commercial products may be obtained by contacting the 
 * authors or the Office of Technology Development at the University of North Carolina at Chapel Hill <otd@unc.edu>.
 *
 * This software program and documentation are copyrighted by the University of North Carolina at Chapel Hill. 
 * The software program and documentation are supplied "as is," without any accompanying services from the 
 * University of North Carolina at Chapel Hill or the authors. The University of North Carolina at Chapel Hill 
 * and the authors do not warrant that the operation of the program will be uninterrupted or error-free. The 
 * end-user understands that the program was developed for research purposes and is advised not to rely 
 * exclusively on the program for any reason.
 *
 * IN NO EVENT SHALL THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL OR THE AUTHORS BE LIABLE TO ANY PARTY FOR 
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE 
 * USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL OR THE 
 * AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND THE AUTHORS SPECIFICALLY DISCLAIM ANY WARRANTIES, INCLUDING, 
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ANY 
 * STATUTORY WARRANTY OF NON-INFRINGEMENT. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY 
 * OF NORTH CAROLINA AT CHAPEL HILL AND THE AUTHORS HAVE NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, 
 * ENHANCEMENTS, OR MODIFICATIONS.
 *
 * Please send all BUG REPORTS to <pavel@cs.unc.edu>.
 *
 * The authors may be contacted via:
 *
 * Pavel Krajcevski
 * Dept of Computer Science
 * 201 S Columbia St
 * Frederick P. Brooks, Jr. Computer Science Bldg
 * Chapel Hill, NC 27599-3175
 * USA
 * 
 * <http://gamma.cs.unc.edu/FasTC/>
 */

#include "StopWatch.h"
#include "TexCompTypes.h"

#include <stdlib.h>
#include <string.h>
#include <time.h>

class StopWatchImpl {
public:
  timespec ts;

  double timer;
  double duration;
};

StopWatch::StopWatch(const StopWatch &other) {
  impl = new StopWatchImpl();
  memcpy(impl, other.impl, sizeof(StopWatchImpl));
}

StopWatch &StopWatch::operator=(const StopWatch &other) {
  if(impl) {
    delete impl;
  }
  impl = new StopWatchImpl();
  memcpy(impl, other.impl, sizeof(StopWatchImpl));
  return *this;
}

StopWatch::~StopWatch() {
  delete impl;
}

StopWatch::StopWatch() : impl(new StopWatchImpl) {
  Reset();
}

void StopWatch::Start() {
  clock_gettime(CLOCK_REALTIME, &(impl->ts));
  impl->timer = double(impl->ts.tv_sec) + 1e-9 * double(impl->ts.tv_nsec);
}

void StopWatch::Stop() {
  clock_gettime(CLOCK_REALTIME, &(impl->ts));
  impl->duration = -(impl->timer) + (double(impl->ts.tv_sec) + 1e-9 * double(impl->ts.tv_nsec));
}

void StopWatch::Reset() {
  impl->timer = impl->duration = 0.0;
  memset(&(impl->ts), 0, sizeof(timespec));
}

double StopWatch::TimeInSeconds() const {
  return impl->duration;
}

double StopWatch::TimeInMilliseconds() const {
  return impl->duration * 1000;
}
	
double StopWatch::TimeInMicroseconds() const {
  return impl->duration * 1000000;
}