nptl/tst-sem5.c

   1 /* Copyright (C) 2002-2019 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <semaphore.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <sys/time.h>
  24 #include <support/check.h>
  25
  26
  27 static int
  28 do_test (void)
  29 {
  30   sem_t s;
  31   struct timespec ts;
  32   struct timeval tv;
  33
  34   TEST_COMPARE (sem_init (&s, 0, 1), 0);
  35   TEST_COMPARE (TEMP_FAILURE_RETRY (sem_wait (&s)), 0);
  36   TEST_COMPARE (gettimeofday (&tv, NULL), 0);
  37
  38   TIMEVAL_TO_TIMESPEC (&tv, &ts);
  39
  40   /* We wait for half a second.  */
  41   ts.tv_nsec += 500000000;
  42   if (ts.tv_nsec >= 1000000000)
  43     {
  44       ++ts.tv_sec;
  45       ts.tv_nsec -= 1000000000;
  46     }
  47
  48   errno = 0;
  49   TEST_COMPARE (TEMP_FAILURE_RETRY (sem_timedwait (&s, &ts)), -1);
  50   TEST_COMPARE (errno, ETIMEDOUT);
  51
  52   struct timespec ts2;
  53   TEST_COMPARE (clock_gettime (CLOCK_REALTIME, &ts2), 0);
  54
  55   TEST_VERIFY (ts2.tv_sec > ts.tv_sec
  56                || (ts2.tv_sec == ts.tv_sec && ts2.tv_nsec > ts.tv_nsec));
  57
  58   return 0;
  59 }
  60
  61 #include <support/test-driver.c>