src/helper/time_support.c

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include "replacements.h"
  25 #include "time_support.h"
  26 #include "log.h"
  27
  28 #include <stdlib.h>
  29
  30 int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y);
  31 int timeval_add(struct timeval *result, struct timeval *x, struct timeval *y);
  32 int timeval_add_time(struct timeval *result, int sec, int usec);
  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 int duration_start_measure(duration_t *duration)
  87 {
  88         gettimeofday(&duration->start, NULL);
  89
  90         return ERROR_OK;
  91 }
  92
  93 int duration_stop_measure(duration_t *duration, char **text)
  94 {
  95         struct timeval end;
  96
  97         gettimeofday(&end, NULL);
  98
  99         timeval_subtract(&duration->duration, &end, &duration->start);
 100
 101         if (text)
 102         {
 103                 float t;
 104                 t=duration->duration.tv_sec;
 105                 t+=(float)duration->duration.tv_usec/1000000.0;
 106                 *text = malloc(100);
 107                 snprintf(*text, 100, "%fs", t);
 108         }
 109
 110         return ERROR_OK;
 111 }
 112
 113 long long timeval_ms()
 114 {
 115         struct timeval now;
 116         long long t=0;
 117         gettimeofday(&now, NULL);
 118
 119         t+=now.tv_usec/1000;
 120         t+=now.tv_sec*1000;
 121
 122         return t;
 123 }