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/* C11 threads call_once test.
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>
/* Flag that controls the first thread access. */
static once_flag flag = ONCE_FLAG_INIT;
static int value = 0;
static void
do_once (void)
{
value++;
}
static int
func (void* data)
{
call_once (&flag, do_once);
thrd_exit (thrd_success);
}
#define N 20
int
do_test (void)
{
thrd_t ids[N];
for (int i = 0; i < N; ++i)
{
if (thrd_create (&ids[i], func, NULL) != thrd_success)
FAIL_EXIT1 ("thrd_create failed");
}
/* Join threads. */
for (int i = 0; i < N; ++i)
{
if (thrd_join (ids[i], NULL) != thrd_success)
FAIL_EXIT1 ("thrd_join failed");
}
return (value != 1);
}
#include <support/test-driver.c>
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