nptl/tst-sem5.c

   1 /* Copyright (C) 2002-2017 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 <stdio.h>
  22 #include <time.h>
  23 #include <unistd.h>
  24 #include <sys/time.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   if (sem_init (&s, 0, 1) == -1)
  35     {
  36       puts ("sem_init failed");
  37       return 1;
  38     }
  39
  40   if (TEMP_FAILURE_RETRY (sem_wait (&s)) == -1)
  41     {
  42       puts ("sem_wait failed");
  43       return 1;
  44     }
  45
  46   if (gettimeofday (&tv, NULL) != 0)
  47     {
  48       puts ("gettimeofday failed");
  49       return 1;
  50     }
  51
  52   TIMEVAL_TO_TIMESPEC (&tv, &ts);
  53
  54   /* We wait for half a second.  */
  55   ts.tv_nsec += 500000000;
  56   if (ts.tv_nsec >= 1000000000)
  57     {
  58       ++ts.tv_sec;
  59       ts.tv_nsec -= 1000000000;
  60     }
  61
  62   errno = 0;
  63   if (TEMP_FAILURE_RETRY (sem_timedwait (&s, &ts)) != -1)
  64     {
  65       puts ("sem_timedwait succeeded");
  66       return 1;
  67     }
  68   if (errno != ETIMEDOUT)
  69     {
  70       printf ("sem_timedwait return errno = %d instead of ETIMEDOUT\n",
  71               errno);
  72       return 1;
  73     }
  74
  75   struct timespec ts2;
  76   if (clock_gettime (CLOCK_REALTIME, &ts2) != 0)
  77     {
  78       puts ("clock_gettime failed");
  79       return 1;
  80     }
  81
  82   if (ts2.tv_sec < ts.tv_sec
  83       || (ts2.tv_sec == ts.tv_sec && ts2.tv_nsec < ts.tv_nsec))
  84     {
  85       puts ("timeout too short");
  86       return 1;
  87     }
  88
  89   return 0;
  90 }
  91
  92 #define TEST_FUNCTION do_test ()
  93 #include "../test-skeleton.c"