source/util.c

   1
   2    /**-------------------------------------------------------------------**
   3     **                               CLooG                               **
   4     **-------------------------------------------------------------------**
   5     **                               util.c                              **
   6     **-------------------------------------------------------------------**
   7     **                   First version: January 8th 2014                 **
   8     **-------------------------------------------------------------------**/
   9
  10
  11 /******************************************************************************
  12  *               CLooG : the Chunky Loop Generator (experimental)             *
  13  ******************************************************************************
  14  *                                                                            *
  15  * Copyright (C) 2002-2005 Cedric Bastoul                                     *
  16  *                                                                            *
  17  * This library is free software; you can redistribute it and/or              *
  18  * modify it under the terms of the GNU Lesser General Public                 *
  19  * License as published by the Free Software Foundation; either               *
  20  * version 2.1 of the License, or (at your option) any later version.         *
  21  *                                                                            *
  22  * This library is distributed in the hope that it will be useful,            *
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of             *
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU          *
  25  * Lesser General Public License for more details.                            *
  26  *                                                                            *
  27  * You should have received a copy of the GNU Lesser General Public           *
  28  * License along with this library; if not, write to the Free Software        *
  29  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                         *
  30  * Boston, MA  02110-1301  USA                                                *
  31  *                                                                            *
  32  * CLooG, the Chunky Loop Generator                                           *
  33  * Written by Cedric Bastoul, Cedric.Bastoul@inria.fr                         *
  34  *                                                                            *
  35  ******************************************************************************/
  36
  37 #include <unistd.h>
  38 #include <sys/time.h>
  39 #include <stdio.h>
  40 #include "../include/cloog/cloog.h"
  41
  42 /**
  43  * cloog_util_rtclock function:
  44  * this function returns the value, in seconds, of the real time clock of
  45  * the operating system. The reference point between calls is consistent,
  46  * making time comparison possible.
  47  * \return The real time clock of the operating system in seconds.
  48  */
  49 double cloog_util_rtclock() {
  50   struct timezone Tzp;
  51   struct timeval Tp;
  52   int stat = gettimeofday(&Tp, &Tzp);
  53   if (stat != 0)
  54     cloog_msg(NULL, CLOOG_WARNING, "Error return from gettimeofday: %d", stat);
  55   return (Tp.tv_sec + Tp.tv_usec*1.0e-6);
  56 }