126 lines
3.4 KiB
C
126 lines
3.4 KiB
C
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// Copyright (c) 1997
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// Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland),
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// INRIA Sophia-Antipolis (France),
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// Max-Planck-Institute Saarbruecken (Germany),
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// and Tel-Aviv University (Israel). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Profiling_tools/include/CGAL/Real_timer.h $
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// $Id: Real_timer.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Lutz Kettner <kettner@inf.ethz.ch>
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// Matthias Baesken <baesken@informatik.uni-halle.de>
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#ifndef CGAL_REAL_TIMER_H
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#define CGAL_REAL_TIMER_H 1
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#include <CGAL/config.h>
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#include <CGAL/assertions.h>
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// For the numerical limits
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#include <cfloat>
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namespace CGAL {
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// SECTION: A Timer Measuring Real-Time
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// ========================================================================
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//
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// DEFINITION
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//
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// A timer `t' of type Real_timer is an object with a state. It is either
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// running or it is stopped. The state is controlled with `t.start()'
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// and `t.stop()'. The timer counts the time elapsed since its creation
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// or last reset. It counts only the time where it is in the running
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// state. The time information is given in seconds.
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class CGAL_EXPORT Real_timer {
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private:
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double elapsed;
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double started;
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int interv;
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bool running;
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#ifdef CGAL_HEADER_ONLY
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static bool& get_static_realtimer_m_failed()
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{
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static bool m_failed = false;
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return m_failed;
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}
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#else // CGAL_HEADER_ONLY
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static bool m_failed;
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static bool& get_static_realtimer_m_failed()
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{ return Real_timer::m_failed; }
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#endif // CGAL_HEADER_ONLY
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double get_real_time() const; // in seconds
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double compute_precision() const; // in seconds
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public:
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Real_timer() : elapsed(0.0), started(0.0), interv(0), running(false) {}
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void start();
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void stop ();
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void reset();
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bool is_running() const { return running; }
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double time() const;
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int intervals() const { return interv; }
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double precision() const;
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// Returns timer precison. Computes it dynamically at first call.
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// Returns -1.0 if timer system call fails, which, for a proper coded
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// test towards precision leads to an immediate stop of an otherwise
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// infinite loop (fixed tolerance * total time >= precision).
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double max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return DBL_MAX; }
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};
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// -----------------------------------------------------------------------
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// Member functions for Real_timer
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// ===========================
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inline void Real_timer::start() {
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CGAL_precondition( ! running);
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started = get_real_time();
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running = true;
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++ interv;
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}
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inline void Real_timer::stop() {
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CGAL_precondition( running);
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double t = get_real_time();
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elapsed += (t - started);
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started = 0.0;
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running = false;
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}
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inline void Real_timer::reset() {
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interv = 0;
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elapsed = 0.0;
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if (running) {
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started = get_real_time();
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++ interv;
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} else {
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started = 0.0;
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}
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}
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inline double Real_timer::time() const {
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if (running) {
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double t = get_real_time();
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return elapsed + (t - started);
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}
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return elapsed;
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}
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} //namespace CGAL
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#ifdef CGAL_HEADER_ONLY
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#include <CGAL/Real_timer_impl.h>
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#endif // CGAL_HEADER_ONLY
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#endif // CGAL_REAL_TIMER_H //
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// EOF //
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