mirror of https://github.com/CGAL/cgal
117 lines
3.1 KiB
C++
117 lines
3.1 KiB
C++
// ======================================================================
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//
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// Copyright (c) 1997 The CGAL Consortium
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//
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// This software and related documentation is part of an INTERNAL release
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// of the Computational Geometry Algorithms Library (CGAL). It is not
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// intended for general use.
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//
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// ----------------------------------------------------------------------
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//
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// release :
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// release_date :
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//
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// file : include/CGAL/Timer.h
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// package : Timer (1.9)
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// maintainer : Matthias Baesken <baesken@informatik.uni-trier.de>
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// revision : 1.9
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// revision_date : 4 April 2001
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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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// coordinator : INRIA, Sophia Antipolis
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//
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// A timer class to measure cpu time of user-processes.
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// ======================================================================
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#ifndef CGAL_TIMER_H
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#define CGAL_TIMER_H 1
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#include <CGAL/basic.h>
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CGAL_BEGIN_NAMESPACE
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// SECTION: A Timer for User-Process 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 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 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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static bool m_failed;
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double user_process_time() const; // in seconds
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double compute_precision() const; // in seconds
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public:
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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() const;
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};
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// -----------------------------------------------------------------------
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// Member functions for Timer
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// ===========================
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inline void Timer::start() {
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CGAL_precondition( ! running);
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started = user_process_time();
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running = true;
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++ interv;
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}
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inline void Timer::stop() {
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CGAL_precondition( running);
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double t = user_process_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 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 = user_process_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 Timer::time() const {
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if (running) {
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double t = user_process_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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CGAL_END_NAMESPACE
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#endif // CGAL_TIMER_H //
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// EOF //
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