nptl/tst-cnd-timedwait.c

   1 /* C11 threads condition timed wait 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    <http://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 *arg)
  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 failed");
  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   struct timespec w_time;
  51
  52   if (cnd_init (&cond) != thrd_success)
  53     FAIL_EXIT1 ("cnd_init failed");
  54   if (mtx_init (&mutex, mtx_plain) != thrd_success)
  55     FAIL_EXIT1 ("mtx_init failed");
  56   if (mtx_lock (&mutex) != thrd_success)
  57     FAIL_EXIT1 ("mtx_lock failed");
  58
  59   if (clock_gettime (CLOCK_REALTIME, &w_time) != 0)
  60     FAIL_EXIT1 ("clock_gettime failed");
  61
  62   /* This needs to be sufficiently long to prevent the cnd_timedwait
  63      call from timing out.  */
  64   w_time.tv_sec += 3600;
  65
  66   if (thrd_create (&id, signal_parent, NULL) != thrd_success)
  67     FAIL_EXIT1 ("thrd_create failed");
  68
  69   if (cnd_timedwait (&cond, &mutex, &w_time) != thrd_success)
  70     FAIL_EXIT1 ("cnd_timedwait failed");
  71
  72   if (thrd_join (id, NULL) != thrd_success)
  73     FAIL_EXIT1 ("thrd_join failed");
  74
  75   if (mtx_unlock (&mutex) != thrd_success)
  76     FAIL_EXIT1 ("mtx_unlock");
  77
  78   mtx_destroy (&mutex);
  79   cnd_destroy (&cond);
  80
  81   return 0;
  82 }
  83
  84 #include <support/test-driver.c>