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