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/* C11 threads basic mutex tests.
Copyright (C) 2018-2020 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 mutex between child and parent. */
static mtx_t mutex;
/* Shared counter to check possible race conditions. */
static int counter;
static int
child_add (void *arg)
{
if (mtx_lock (&mutex) != thrd_success)
FAIL_EXIT1 ("mtx_lock failed");
counter++;
if (mtx_unlock (&mutex) != thrd_success)
FAIL_EXIT1 ("mtx_unlock failed");
thrd_exit (thrd_success);
}
static int
do_test (void)
{
mtx_init (&mutex, mtx_plain);
thrd_t id;
if (thrd_create (&id, child_add, NULL) != thrd_success)
FAIL_EXIT1 ("thrd_create failed");
if (mtx_lock (&mutex) != thrd_success)
FAIL_EXIT1 ("mtx_lock failed");
counter++;
if (mtx_unlock (&mutex) != thrd_success)
FAIL_EXIT1 ("mtx_unlock failed");
if (thrd_join (id, NULL) != thrd_success)
FAIL_EXIT1 ("thrd_join failed");
if (counter != 2)
FAIL_EXIT1 ("counter (%d) != 2", counter);
mtx_destroy (&mutex);
return 0;
}
#include <support/test-driver.c>
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