eglib/src/gtimer-unix.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 #include <sys/time.h>
  30
  31 struct _GTimer {
  32         struct timeval start;
  33         struct timeval stop;
  34 };
  35
  36 GTimer *g_timer_new (void)
  37 {
  38         GTimer *timer;
  39
  40         timer = g_new0 (GTimer, 1);
  41         g_timer_start (timer);
  42         return timer;
  43 }
  44
  45 void
  46 g_timer_destroy (GTimer *timer)
  47 {
  48         g_return_if_fail (timer != NULL);
  49         g_free (timer);
  50 }
  51
  52 void
  53 g_timer_start (GTimer *timer)
  54 {
  55         g_return_if_fail (timer != NULL);
  56         gettimeofday (&timer->start, NULL);
  57         memset (&timer->stop, 0, sizeof (struct timeval));
  58 }
  59
  60 void
  61 g_timer_stop (GTimer *timer)
  62 {
  63         g_return_if_fail (timer != NULL);
  64         gettimeofday (&timer->stop, NULL);
  65 }
  66
  67 gdouble
  68 g_timer_elapsed (GTimer *timer, gulong *microseconds)
  69 {
  70         struct timeval tv;
  71         gulong seconds;
  72         long usec;
  73         gdouble result;
  74
  75         g_return_val_if_fail (timer != NULL, 0.0);
  76
  77         if (timer->stop.tv_sec == 0 && timer->stop.tv_usec == 0) {
  78                 gettimeofday (&tv, NULL);
  79         } else {
  80                 tv = timer->stop;
  81         }
  82
  83         usec = (tv.tv_usec) - (timer->start.tv_usec);
  84         seconds = tv.tv_sec - timer->start.tv_sec;
  85         if (microseconds) {
  86                 if (usec < 0) {
  87                         usec += 1000000;
  88                         seconds--;
  89                 }
  90                 *microseconds = usec;
  91         }
  92         result = seconds * 1000000 + usec;
  93         return (result / 1000000);
  94 }
  95
  96