sysdeps/pthread/tst-sem1.c

   1 /* Copyright (C) 2002-2024 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <semaphore.h>
  20 #include <stdio.h>
  21 #include <unistd.h>
  22
  23
  24 static int
  25 do_test (void)
  26 {
  27   sem_t s;
  28
  29   if (sem_init (&s, 0, 1) == -1)
  30     {
  31       puts ("init failed");
  32       return 1;
  33     }
  34
  35   if (TEMP_FAILURE_RETRY (sem_wait (&s)) == -1)
  36     {
  37       puts ("1st wait failed");
  38       return 1;
  39     }
  40
  41   if (sem_post (&s) == -1)
  42     {
  43       puts ("1st post failed");
  44       return 1;
  45     }
  46
  47   if (TEMP_FAILURE_RETRY (sem_trywait (&s)) == -1)
  48     {
  49       puts ("1st trywait failed");
  50       return 1;
  51     }
  52
  53   errno = 0;
  54   if (TEMP_FAILURE_RETRY (sem_trywait (&s)) != -1)
  55     {
  56       puts ("2nd trywait succeeded");
  57       return 1;
  58     }
  59   else if (errno != EAGAIN)
  60     {
  61       puts ("2nd trywait did not set errno to EAGAIN");
  62       return 1;
  63     }
  64
  65   if (sem_post (&s) == -1)
  66     {
  67       puts ("2nd post failed");
  68       return 1;
  69     }
  70
  71   if (TEMP_FAILURE_RETRY (sem_wait (&s)) == -1)
  72     {
  73       puts ("2nd wait failed");
  74       return 1;
  75     }
  76
  77   if (sem_destroy (&s) == -1)
  78     {
  79       puts ("destroy failed");
  80       return 1;
  81     }
  82
  83   return 0;
  84 }
  85
  86 #define TEST_FUNCTION do_test ()
  87 #include "../test-skeleton.c"