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/* Test pthread_once.
Copyright (C) 2000-2020 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/>. */
#define _GNU_SOURCE
#include <pthread.h>
#include <assert.h>
#include <error.h>
#include <errno.h>
#define THREADS 10
pthread_once_t inc_var_once = PTHREAD_ONCE_INIT;
int var;
void
inc_var (void)
{
var++;
}
void *
thr (void *arg)
{
int i;
for (i = 0; i < 500; i++)
pthread_once (&inc_var_once, inc_var);
return 0;
}
int
main (int argc, char **argv)
{
error_t err;
int i;
pthread_t tid[THREADS];
for (i = 0; i < THREADS; i++)
{
err = pthread_create (&tid[i], 0, thr, 0);
if (err)
error (1, err, "pthread_create (%d)", i);
}
assert (thr (0) == 0);
for (i = 0; i < THREADS; i++)
{
void *ret;
err = pthread_join (tid[i], &ret);
if (err)
error (1, err, "pthread_join");
assert (ret == 0);
}
assert (var == 1);
return 0;
}
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