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  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  22  ***************************************************************************/
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include "replacements.h"
  28 #include "time_support.h"
  29 #include "log.h"
  30
  31 #include <stdlib.h>
  32
  33 int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y);
  34 int timeval_add(struct timeval *result, struct timeval *x, struct timeval *y);
  35 int timeval_add_time(struct timeval *result, int sec, int usec);
  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 int duration_start_measure(duration_t *duration)
  90 {
  91         gettimeofday(&duration->start, NULL);
  92
  93         return ERROR_OK;
  94 }
  95
  96 int duration_stop_measure(duration_t *duration, char **text)
  97 {
  98         struct timeval end;
  99
 100         gettimeofday(&end, NULL);
 101
 102         timeval_subtract(&duration->duration, &end, &duration->start);
 103
 104         if (text)
 105         {
 106                 float t;
 107                 t=duration->duration.tv_sec;
 108                 t+=(float)duration->duration.tv_usec/1000000.0;
 109                 *text = malloc(100);
 110                 snprintf(*text, 100, "%fs", t);
 111         }
 112
 113         return ERROR_OK;
 114 }
 115
 116 long long timeval_ms()
 117 {
 118         struct timeval now;
 119         long long t=0;
 120         gettimeofday(&now, NULL);
 121
 122         t+=now.tv_usec/1000;
 123         t+=now.tv_sec*1000;
 124
 125         return t;
 126 }