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// Copyright (c) 1997 Utrecht University (The Netherlands),
// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
// and Tel-Aviv University (Israel). All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; version 2.1 of the License.
// See the file LICENSE.LGPL distributed with CGAL.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL: svn+ssh://scm.gforge.inria.fr/svn/cgal/branches/CGAL-3.2-branch/Timer/include/CGAL/Real_timer.h $
// $Id: Real_timer.h 28567 2006-02-16 14:30:13Z lsaboret $
//
//
// Author(s) : Lutz Kettner <kettner@inf.ethz.ch>
// Matthias Baesken <baesken@informatik.uni-halle.de>
#ifndef CGAL_REAL_TIMER_H
#define CGAL_REAL_TIMER_H 1
#include <CGAL/basic.h>
// For the numerical limits
#include <float.h>
CGAL_BEGIN_NAMESPACE
// SECTION: A Timer Measuring Real-Time
// ========================================================================
//
// DEFINITION
//
// A timer `t' of type Real_timer is an object with a state. It is either
// running or it is stopped. The state is controlled with `t.start()'
// and `t.stop()'. The timer counts the time elapsed since its creation
// or last reset. It counts only the time where it is in the running
// state. The time information is given in seconds.
class Real_timer {
private:
double elapsed;
double started;
int interv;
bool running;
static bool m_failed;
double get_real_time() const; // in seconds
double compute_precision() const; // in seconds
public:
Real_timer() : elapsed(0.0), started(0.0), interv(0), running(false) {}
void start();
void stop ();
void reset();
bool is_running() const { return running; }
double time() const;
int intervals() const { return interv; }
double precision() const;
// Returns timer precison. Computes it dynamically at first call.
// Returns -1.0 if timer system call fails, which, for a proper coded
// test towards precision leads to an immediate stop of an otherwise
// infinite loop (fixed tolerance * total time >= precision).
double max() const { return DBL_MAX; }
};
// -----------------------------------------------------------------------
// Member functions for Real_timer
// ===========================
inline void Real_timer::start() {
CGAL_precondition( ! running);
started = get_real_time();
running = true;
++ interv;
}
inline void Real_timer::stop() {
CGAL_precondition( running);
double t = get_real_time();
elapsed += (t - started);
started = 0.0;
running = false;
}
inline void Real_timer::reset() {
interv = 0;
elapsed = 0.0;
if (running) {
started = get_real_time();
++ interv;
} else {
started = 0.0;
}
}
inline double Real_timer::time() const {
if (running) {
double t = get_real_time();
return elapsed + (t - started);
}
return elapsed;
}
CGAL_END_NAMESPACE
#endif // CGAL_REAL_TIMER_H //
// EOF //
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