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stop_watch.H

Go to the documentation of this file.

/*
 * Copyright 1997, Brown University, Providence, RI.
 * 
 *                         All Rights Reserved
 * 
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose other than its incorporation into a
 * commercial product is hereby granted without fee, provided that the
 * above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Brown University not be used in
 * advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission.
 * 
 * BROWN UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ANY
 * PARTICULAR PURPOSE.  IN NO EVENT SHALL BROWN UNIVERSITY BE LIABLE FOR
 * ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
/* Copyright 1997, Brown Computer Graphics Group.  All Rights Reserved. */

/**********************************************************************
 * stop_watch.H
 **********************************************************************/
#ifndef STOP_WATCH_H_HAS_BEEN_INCLUDED
#define STOP_WATCH_H_HAS_BEEN_INCLUDED

#ifdef sun
#include <sys/time.h>           // gettimeofday, gethrtime
#endif
#include "std/time.H"
#include "std/error.H"          // io etc.

/**********************************************************************
 * stop_watch:
 *
 *      utility class for getting or printing timing info.
 *      used for debugging and performance testing.
 **********************************************************************/
class stop_watch {
#ifdef sun
   protected:
      hrtime_t     _start;

   public:
      stop_watch() : _start(gethrtime()) {}

      // Set stop-watch start time 
      void set() { _start = gethrtime(); }

      // Get stop-watch elapsed time
      // XXX - rename -- spell correctly
      double elapse_time() const { return (gethrtime()-_start)/1e9; }

      // Get current time, in seconds since time orign
      static double cur_time() { return gethrtime()/1e9; }

#else
   protected:
      double       _start;

   public:
      stop_watch() : _start(cur_time()) {}

      // Set stop-watch start time 
      void   set() { _start = cur_time(); }

      // Get stop-watch elapsed time
      double elapse_time() const { return cur_time() - _start; }

      // Get current time, in seconds since time orign
      static double cur_time() { return the_time(); }
#endif

      // prints "msg: X seconds", where X is the elapsed time
      void print_time(char* msg="elapsed time") { err_msg("%s: %f seconds", msg, elapse_time()); }
};

#endif  // STOP_WATCH_H_HAS_BEEN_INCLUDED

/* end of file stop_watch.H */

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