nptl/tst-sem1.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 <unistd.h>
  23
  24
  25 static int
  26 do_test (void)
  27 {
  28   sem_t s;
  29
  30   if (sem_init (&s, 0, 1) == -1)
  31     {
  32       puts ("init failed");
  33       return 1;
  34     }
  35
  36   if (TEMP_FAILURE_RETRY (sem_wait (&s)) == -1)
  37     {
  38       puts ("1st wait failed");
  39       return 1;
  40     }
  41
  42   if (sem_post (&s) == -1)
  43     {
  44       puts ("1st post failed");
  45       return 1;
  46     }
  47
  48   if (TEMP_FAILURE_RETRY (sem_trywait (&s)) == -1)
  49     {
  50       puts ("1st trywait failed");
  51       return 1;
  52     }
  53
  54   errno = 0;
  55   if (TEMP_FAILURE_RETRY (sem_trywait (&s)) != -1)
  56     {
  57       puts ("2nd trywait succeeded");
  58       return 1;
  59     }
  60   else if (errno != EAGAIN)
  61     {
  62       puts ("2nd trywait did not set errno to EAGAIN");
  63       return 1;
  64     }
  65
  66   if (sem_post (&s) == -1)
  67     {
  68       puts ("2nd post failed");
  69       return 1;
  70     }
  71
  72   if (TEMP_FAILURE_RETRY (sem_wait (&s)) == -1)
  73     {
  74       puts ("2nd wait failed");
  75       return 1;
  76     }
  77
  78   if (sem_destroy (&s) == -1)
  79     {
  80       puts ("destroy failed");
  81       return 1;
  82     }
  83
  84   return 0;
  85 }
  86
  87 #define TEST_FUNCTION do_test ()
  88 #include "../test-skeleton.c"