src/helper/time_support.c

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   Copyright (C) 2008 by Spencer Oliver                                  *
   9  *   spen@spen-soft.co.uk                                                  *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include "time_support.h"
  31 #include "log.h"
  32
  33
  34 /* calculate difference between two struct timeval values */
  35 int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y)
  36 {
  37         if (x->tv_usec < y->tv_usec)
  38         {
  39                 int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
  40                 y->tv_usec -= 1000000 * nsec;
  41                 y->tv_sec += nsec;
  42         }
  43         if (x->tv_usec - y->tv_usec > 1000000) {
  44                 int nsec = (x->tv_usec - y->tv_usec) / 1000000;
  45                 y->tv_usec += 1000000 * nsec;
  46                 y->tv_sec -= nsec;
  47         }
  48
  49         result->tv_sec = x->tv_sec - y->tv_sec;
  50         result->tv_usec = x->tv_usec - y->tv_usec;
  51
  52         /* Return 1 if result is negative. */
  53         return x->tv_sec < y->tv_sec;
  54 }
  55
  56 /* add two struct timeval values */
  57 int timeval_add(struct timeval *result, struct timeval *x, struct timeval *y)
  58 {
  59         result->tv_sec = x->tv_sec + y->tv_sec;
  60
  61         result->tv_usec = x->tv_usec + y->tv_usec;
  62
  63         while (result->tv_usec > 1000000)
  64         {
  65                 result->tv_usec -= 1000000;
  66                 result->tv_sec++;
  67         }
  68
  69         return 0;
  70 }
  71
  72 int timeval_add_time(struct timeval *result, int sec, int usec)
  73 {
  74         result->tv_sec += sec;
  75         result->tv_usec += usec;
  76
  77         while (result->tv_usec > 1000000)
  78         {
  79                 result->tv_usec -= 1000000;
  80                 result->tv_sec++;
  81         }
  82
  83         return 0;
  84 }
  85
  86 void duration_start_measure(duration_t *duration)
  87 {
  88         gettimeofday(&duration->start, NULL);
  89 }
  90
  91 int duration_stop_measure(duration_t *duration, char **text)
  92 {
  93         struct timeval end;
  94
  95         gettimeofday(&end, NULL);
  96
  97         timeval_subtract(&duration->duration, &end, &duration->start);
  98
  99         if (text)
 100         {
 101                 float t;
 102                 t = duration->duration.tv_sec;
 103                 t += (float)duration->duration.tv_usec/1000000.0;
 104                 *text = malloc(100);
 105                 snprintf(*text, 100, "%fs", t);
 106         }
 107
 108         return ERROR_OK;
 109 }
 110
 111 long long timeval_ms()
 112 {
 113         struct timeval now;
 114         long long t = 0;
 115         gettimeofday(&now, NULL);
 116
 117         t += now.tv_usec/1000;
 118         t += now.tv_sec*1000;
 119
 120         return t;
 121 }