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 "replacements.h"
  31 #include "time_support.h"
  32 #include "log.h"
  33
  34 #include <stdlib.h>
  35
  36 int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y);
  37 int timeval_add(struct timeval *result, struct timeval *x, struct timeval *y);
  38 int timeval_add_time(struct timeval *result, int sec, int usec);
  39
  40 /* calculate difference between two struct timeval values */
  41 int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y)
  42 {
  43         if (x->tv_usec < y->tv_usec)
  44         {
  45                 int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
  46                 y->tv_usec -= 1000000 * nsec;
  47                 y->tv_sec += nsec;
  48         }
  49         if (x->tv_usec - y->tv_usec > 1000000) {
  50                 int nsec = (x->tv_usec - y->tv_usec) / 1000000;
  51                 y->tv_usec += 1000000 * nsec;
  52                 y->tv_sec -= nsec;
  53         }
  54
  55         result->tv_sec = x->tv_sec - y->tv_sec;
  56         result->tv_usec = x->tv_usec - y->tv_usec;
  57
  58         /* Return 1 if result is negative. */
  59         return x->tv_sec < y->tv_sec;
  60 }
  61
  62 /* add two struct timeval values */
  63 int timeval_add(struct timeval *result, struct timeval *x, struct timeval *y)
  64 {
  65         result->tv_sec = x->tv_sec + y->tv_sec;
  66
  67         result->tv_usec = x->tv_usec + y->tv_usec;
  68
  69         while (result->tv_usec > 1000000)
  70         {
  71                 result->tv_usec -= 1000000;
  72                 result->tv_sec++;
  73         }
  74
  75         return 0;
  76 }
  77
  78 int timeval_add_time(struct timeval *result, int sec, int usec)
  79 {
  80         result->tv_sec += sec;
  81         result->tv_usec += usec;
  82
  83         while (result->tv_usec > 1000000)
  84         {
  85                 result->tv_usec -= 1000000;
  86                 result->tv_sec++;
  87         }
  88
  89         return 0;
  90 }
  91
  92 void duration_start_measure(duration_t *duration)
  93 {
  94         gettimeofday(&duration->start, NULL);
  95 }
  96
  97 int duration_stop_measure(duration_t *duration, char **text)
  98 {
  99         struct timeval end;
 100
 101         gettimeofday(&end, NULL);
 102
 103         timeval_subtract(&duration->duration, &end, &duration->start);
 104
 105         if (text)
 106         {
 107                 float t;
 108                 t=duration->duration.tv_sec;
 109                 t+=(float)duration->duration.tv_usec/1000000.0;
 110                 *text = malloc(100);
 111                 snprintf(*text, 100, "%fs", t);
 112         }
 113
 114         return ERROR_OK;
 115 }
 116
 117 long long timeval_ms()
 118 {
 119         struct timeval now;
 120         long long t=0;
 121         gettimeofday(&now, NULL);
 122
 123         t+=now.tv_usec/1000;
 124         t+=now.tv_sec*1000;
 125
 126         return t;
 127 }