eglib/src/gtimer.c

   1 /*
   2  * Timer
   3  *
   4  * Author:
   5  *   Gonzalo Paniagua Javier (gonzalo@novell.com
   6  *
   7  * (C) 2006 Novell, Inc.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining
  10  * a copy of this software and associated documentation files (the
  11  * "Software"), to deal in the Software without restriction, including
  12  * without limitation the rights to use, copy, modify, merge, publish,
  13  * distribute, sublicense, and/or sell copies of the Software, and to
  14  * permit persons to whom the Software is furnished to do so, subject to
  15  * the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be
  18  * included in all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27  */
  28 #include <glib.h>
  29 #ifdef _MSC_VER
  30 #include <windows.h>
  31 #else
  32 #include <sys/time.h>
  33 #endif
  34
  35 struct _GTimer {
  36 #ifdef _MSC_VER
  37         guint64 start;
  38         guint64 stop;
  39 #else
  40         struct timeval start;
  41         struct timeval stop;
  42 #endif
  43 };
  44
  45 GTimer *g_timer_new (void)
  46 {
  47         GTimer *timer;
  48
  49         timer = g_new0 (GTimer, 1);
  50         g_timer_start (timer);
  51         return timer;
  52 }
  53
  54 void
  55 g_timer_destroy (GTimer *timer)
  56 {
  57         g_return_if_fail (timer != NULL);
  58         g_free (timer);
  59 }
  60
  61 void
  62 g_timer_start (GTimer *timer)
  63 {
  64         g_return_if_fail (timer != NULL);
  65 #ifdef _MSC_VER
  66         QueryPerformanceCounter ((LARGE_INTEGER*)&timer->start);
  67 #else
  68         gettimeofday (&timer->start, NULL);
  69         memset (&timer->stop, 0, sizeof (struct timeval));
  70 #endif
  71
  72 }
  73
  74 void
  75 g_timer_stop (GTimer *timer)
  76 {
  77         g_return_if_fail (timer != NULL);
  78 #ifdef _MSC_VER
  79         QueryPerformanceCounter ((LARGE_INTEGER*)&timer->stop);
  80 #else
  81         gettimeofday (&timer->stop, NULL);
  82 #endif
  83 }
  84
  85 gdouble
  86 g_timer_elapsed (GTimer *timer, gulong *microseconds)
  87 {
  88 #ifdef _MSC_VER
  89         guint64 stop;
  90         guint64 freq;
  91         gdouble seconds;
  92         if (timer->stop == 0) {
  93                 QueryPerformanceCounter ((LARGE_INTEGER*)&stop);
  94         }
  95         else {
  96                 stop = timer->stop;
  97         }
  98
  99         QueryPerformanceFrequency ((LARGE_INTEGER*)&freq);
 100         seconds = 1.0 * (stop - timer->start) / freq;
 101
 102         if (microseconds) {
 103                 *microseconds = (gulong)(1000000.0 * (stop - timer->start) / freq);
 104         }
 105         return seconds;
 106 #else
 107         struct timeval tv;
 108         gulong seconds;
 109         long usec;
 110         gdouble result;
 111
 112         g_return_val_if_fail (timer != NULL, 0.0);
 113
 114         if (timer->stop.tv_sec == 0 && timer->stop.tv_usec == 0) {
 115                 gettimeofday (&tv, NULL);
 116         } else {
 117                 tv = timer->stop;
 118         }
 119
 120         usec = (tv.tv_usec) - (timer->start.tv_usec);
 121         seconds = tv.tv_sec - timer->start.tv_sec;
 122         if (microseconds) {
 123                 if (usec < 0) {
 124                         usec += 1000000;
 125                         seconds--;
 126                 }
 127                 *microseconds = usec;
 128         }
 129         result = seconds * 1000000 + usec;
 130         return (result / 1000000);
 131 #endif
 132 }
 133
 134