nptl/tst-cnd-basic.c

   1 /* C11 threads condition variable 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 condition variable between child and parent.  */
  26 static cnd_t cond;
  27
  28 /* Mutex needed to signal and wait threads.  */
  29 static mtx_t mutex;
  30
  31 static int
  32 signal_parent (void)
  33 {
  34   /* Acquire the lock so that cnd_signal does not run until
  35      cnd_timedwait has been called.  */
  36   if (mtx_lock (&mutex) != thrd_success)
  37     FAIL_EXIT1 ("mtx_lock failed");
  38   if (cnd_signal (&cond) != thrd_success)
  39     FAIL_EXIT1 ("cnd_signal");
  40   if (mtx_unlock (&mutex) != thrd_success)
  41     FAIL_EXIT1 ("mtx_unlock");
  42
  43   thrd_exit (thrd_success);
  44 }
  45
  46 static int
  47 do_test (void)
  48 {
  49   thrd_t id;
  50
  51   if (cnd_init (&cond) != thrd_success)
  52     FAIL_EXIT1 ("cnd_init failed");
  53   if (mtx_init (&mutex, mtx_plain) != thrd_success)
  54     FAIL_EXIT1 ("mtx_init failed");
  55
  56   if (mtx_lock (&mutex) != thrd_success)
  57     FAIL_EXIT1 ("mtx_lock failed");
  58
  59   if (thrd_create (&id, (thrd_start_t) signal_parent, NULL)
  60       != thrd_success)
  61     FAIL_EXIT1 ("thrd_create failed");
  62
  63   if (cnd_wait (&cond, &mutex) != thrd_success)
  64     FAIL_EXIT1 ("cnd_wait failed");
  65
  66   /* Joining is not mandatory here, but still done to assure child thread
  67      ends correctly.  */
  68   if (thrd_join (id, NULL) != thrd_success)
  69     FAIL_EXIT1 ("thrd_join failed");
  70
  71   if (mtx_unlock (&mutex) != thrd_success)
  72     FAIL_EXIT1 ("mtx_unlock");
  73
  74   mtx_destroy (&mutex);
  75   cnd_destroy (&cond);
  76
  77   return 0;
  78 }
  79
  80 #include <support/test-driver.c>