mono/eglib/gdate-unix.c

   1 /*
   2  * gdate-unix.c: Date and time utility functions.
   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 "config.h"
  29 #include <stdio.h>
  30 #include <glib.h>
  31 #include <time.h>
  32 #include <errno.h>
  33 #include <sys/time.h>
  34
  35 void
  36 g_get_current_time (GTimeVal *result)
  37 {
  38         struct timeval tv;
  39
  40         g_return_if_fail (result != NULL);
  41         gettimeofday (&tv, NULL);
  42         result->tv_sec = tv.tv_sec;
  43         result->tv_usec = tv.tv_usec;
  44 }
  45
  46 void
  47 g_usleep (gulong microseconds)
  48 {
  49 #if defined(HAVE_CLOCK_NANOSLEEP) && !defined(__PASE__)
  50         struct timespec target;
  51
  52         /*
  53          * Use clock_nanosleep () with absolute time to prevent time drifting problems
  54          * when nanosleep () is interrupted by signals.
  55          */
  56         int ret = clock_gettime (CLOCK_MONOTONIC, &target);
  57         g_assert (ret == 0);
  58
  59         target.tv_sec += microseconds / 1000000;
  60         target.tv_nsec += (microseconds % 1000000) * 1000;
  61         if (target.tv_nsec >= 1000000000) {
  62                 target.tv_nsec -= 1000000000;
  63                 target.tv_sec ++;
  64         }
  65
  66         do {
  67                 ret = clock_nanosleep (CLOCK_MONOTONIC, TIMER_ABSTIME, &target, NULL);
  68                 if (ret != 0 && ret != EINTR)
  69                         g_error ("%s: clock_nanosleep () returned %d", __func__, ret);
  70         } while (ret == EINTR);
  71
  72 #else
  73         struct timespec rem, req;
  74
  75         req.tv_sec = microseconds / 1000000;
  76         req.tv_nsec = (microseconds % 1000000) * 1000;
  77
  78         while (nanosleep (&req, &rem) == -1 && errno == EINTR)
  79                 req = rem;
  80 #endif
  81 }