release/src/router/glib/gtimer.c

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GLib Team and others 1997-1999.  See the AUTHORS
  22  * file for a list of people on the GLib Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 /*
  28  * MT safe
  29  */
  30
  31 #ifdef HAVE_CONFIG_H
  32 #include <config.h>
  33 #endif
  34
  35 #include "glib.h"
  36 #ifdef HAVE_UNISTD_H
  37 #include <unistd.h>
  38 #endif /* HAVE_UNISTD_H */
  39 #ifndef NATIVE_WIN32
  40 #include <sys/time.h>
  41 #endif /* NATIVE_WIN32 */
  42
  43 #ifdef NATIVE_WIN32
  44 #include <windows.h>
  45 #endif /* NATIVE_WIN32 */
  46
  47 typedef struct _GRealTimer GRealTimer;
  48
  49 struct _GRealTimer
  50 {
  51 #ifdef NATIVE_WIN32
  52   DWORD start;
  53   DWORD end;
  54 #else /* !NATIVE_WIN32 */
  55   struct timeval start;
  56   struct timeval end;
  57 #endif /* !NATIVE_WIN32 */
  58
  59   guint active : 1;
  60 };
  61
  62 GTimer*
  63 g_timer_new (void)
  64 {
  65   GRealTimer *timer;
  66
  67   timer = g_new (GRealTimer, 1);
  68   timer->active = TRUE;
  69
  70 #ifdef NATIVE_WIN32
  71   timer->start = GetTickCount ();
  72 #else /* !NATIVE_WIN32 */
  73   gettimeofday (&timer->start, NULL);
  74 #endif /* !NATIVE_WIN32 */
  75
  76   return ((GTimer*) timer);
  77 }
  78
  79 void
  80 g_timer_destroy (GTimer *timer)
  81 {
  82   g_return_if_fail (timer != NULL);
  83
  84   g_free (timer);
  85 }
  86
  87 void
  88 g_timer_start (GTimer *timer)
  89 {
  90   GRealTimer *rtimer;
  91
  92   g_return_if_fail (timer != NULL);
  93
  94   rtimer = (GRealTimer*) timer;
  95   rtimer->active = TRUE;
  96
  97 #ifdef NATIVE_WIN32
  98   rtimer->start = GetTickCount ();
  99 #else /* !NATIVE_WIN32 */
 100   gettimeofday (&rtimer->start, NULL);
 101 #endif /* !NATIVE_WIN32 */
 102 }
 103
 104 void
 105 g_timer_stop (GTimer *timer)
 106 {
 107   GRealTimer *rtimer;
 108
 109   g_return_if_fail (timer != NULL);
 110
 111   rtimer = (GRealTimer*) timer;
 112   rtimer->active = FALSE;
 113
 114 #ifdef NATIVE_WIN32
 115   rtimer->end = GetTickCount ();
 116 #else /* !NATIVE_WIN32 */
 117   gettimeofday (&rtimer->end, NULL);
 118 #endif /* !NATIVE_WIN32 */
 119 }
 120
 121 void
 122 g_timer_reset (GTimer *timer)
 123 {
 124   GRealTimer *rtimer;
 125
 126   g_return_if_fail (timer != NULL);
 127
 128   rtimer = (GRealTimer*) timer;
 129
 130 #ifdef NATIVE_WIN32
 131    rtimer->start = GetTickCount ();
 132 #else /* !NATIVE_WIN32 */
 133   gettimeofday (&rtimer->start, NULL);
 134 #endif /* !NATIVE_WIN32 */
 135 }
 136
 137 gdouble
 138 g_timer_elapsed (GTimer *timer,
 139                  gulong *microseconds)
 140 {
 141   GRealTimer *rtimer;
 142   gdouble total;
 143 #ifndef NATIVE_WIN32
 144   struct timeval elapsed;
 145 #endif /* NATIVE_WIN32 */
 146
 147   g_return_val_if_fail (timer != NULL, 0);
 148
 149   rtimer = (GRealTimer*) timer;
 150
 151 #ifdef NATIVE_WIN32
 152   if (rtimer->active)
 153     rtimer->end = GetTickCount ();
 154
 155   /* Check for wraparound, which happens every 49.7 days.
 156    * No, Win95 machines probably are never running for that long,
 157    * but NT machines are.
 158    */
 159   if (rtimer->end < rtimer->start)
 160     total = (UINT_MAX - (rtimer->start - rtimer->end)) / 1000.0;
 161   else
 162     total = (rtimer->end - rtimer->start) / 1000.0;
 163
 164   if (microseconds)
 165     {
 166       if (rtimer->end < rtimer->start)
 167         *microseconds =
 168           ((UINT_MAX - (rtimer->start - rtimer->end)) % 1000) * 1000;
 169       else
 170         *microseconds =
 171           ((rtimer->end - rtimer->start) % 1000) * 1000;
 172     }
 173 #else /* !NATIVE_WIN32 */
 174   if (rtimer->active)
 175     gettimeofday (&rtimer->end, NULL);
 176
 177   if (rtimer->start.tv_usec > rtimer->end.tv_usec)
 178     {
 179       rtimer->end.tv_usec += 1000000;
 180       rtimer->end.tv_sec--;
 181     }
 182
 183   elapsed.tv_usec = rtimer->end.tv_usec - rtimer->start.tv_usec;
 184   elapsed.tv_sec = rtimer->end.tv_sec - rtimer->start.tv_sec;
 185
 186   total = elapsed.tv_sec + ((gdouble) elapsed.tv_usec / 1e6);
 187   if (total < 0)
 188     {
 189       total = 0;
 190
 191       if (microseconds)
 192         *microseconds = 0;
 193     }
 194   else
 195     if (microseconds)
 196       *microseconds = elapsed.tv_usec;
 197
 198 #endif /* !NATIVE_WIN32 */
 199
 200   return total;
 201 }