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/* C11 threads condition variable tests.
Copyright (C) 2018-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <threads.h>
#include <stdio.h>
#include <unistd.h>
#include <support/check.h>
/* Shared condition variable between child and parent. */
static cnd_t cond;
/* Mutex needed to signal and wait threads. */
static mtx_t mutex;
static int
signal_parent (void)
{
/* Acquire the lock so that cnd_signal does not run until
cnd_timedwait has been called. */
if (mtx_lock (&mutex) != thrd_success)
FAIL_EXIT1 ("mtx_lock failed");
if (cnd_signal (&cond) != thrd_success)
FAIL_EXIT1 ("cnd_signal");
if (mtx_unlock (&mutex) != thrd_success)
FAIL_EXIT1 ("mtx_unlock");
thrd_exit (thrd_success);
}
static int
do_test (void)
{
thrd_t id;
if (cnd_init (&cond) != thrd_success)
FAIL_EXIT1 ("cnd_init failed");
if (mtx_init (&mutex, mtx_plain) != thrd_success)
FAIL_EXIT1 ("mtx_init failed");
if (mtx_lock (&mutex) != thrd_success)
FAIL_EXIT1 ("mtx_lock failed");
if (thrd_create (&id, (thrd_start_t) signal_parent, NULL)
!= thrd_success)
FAIL_EXIT1 ("thrd_create failed");
if (cnd_wait (&cond, &mutex) != thrd_success)
FAIL_EXIT1 ("cnd_wait failed");
/* Joining is not mandatory here, but still done to assure child thread
ends correctly. */
if (thrd_join (id, NULL) != thrd_success)
FAIL_EXIT1 ("thrd_join failed");
if (mtx_unlock (&mutex) != thrd_success)
FAIL_EXIT1 ("mtx_unlock");
mtx_destroy (&mutex);
cnd_destroy (&cond);
return 0;
}
#include <support/test-driver.c>
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