nptl/tst-mtx-basic.c

   1 /* C11 threads basic mutex tests.
   2    Copyright (C) 2018-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <threads.h>
  20 #include <stdio.h>
  21 #include <unistd.h>
  22
  23 #include <support/check.h>
  24
  25 /* Shared mutex between child and parent.  */
  26 static mtx_t mutex;
  27
  28 /* Shared counter to check possible race conditions.  */
  29 static int counter;
  30
  31 static int
  32 child_add (void *arg)
  33 {
  34   if (mtx_lock (&mutex) != thrd_success)
  35     FAIL_EXIT1 ("mtx_lock failed");
  36
  37   counter++;
  38
  39   if (mtx_unlock (&mutex) != thrd_success)
  40     FAIL_EXIT1 ("mtx_unlock failed");
  41
  42   thrd_exit (thrd_success);
  43 }
  44
  45 static int
  46 do_test (void)
  47 {
  48   mtx_init (&mutex, mtx_plain);
  49
  50   thrd_t id;
  51   if (thrd_create (&id, child_add, NULL) != thrd_success)
  52     FAIL_EXIT1 ("thrd_create failed");
  53
  54   if (mtx_lock (&mutex) != thrd_success)
  55     FAIL_EXIT1 ("mtx_lock failed");
  56
  57   counter++;
  58
  59   if (mtx_unlock (&mutex) != thrd_success)
  60     FAIL_EXIT1 ("mtx_unlock failed");
  61
  62   if (thrd_join (id, NULL) != thrd_success)
  63     FAIL_EXIT1 ("thrd_join failed");
  64
  65   if (counter != 2)
  66     FAIL_EXIT1 ("counter (%d) != 2", counter);
  67
  68   mtx_destroy (&mutex);
  69
  70   return 0;
  71 }
  72
  73 #include <support/test-driver.c>