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/* Support file for atexit/exit, etc. race tests (BZ #27749).
Copyright (C) 2021-2024 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/>. */
/* The atexit/exit, at_quick_exit/quick_exit, __cxa_atexit/exit, etc.
exhibited data race while calling destructors.
This test registers destructors from the background thread, and checks that
the same destructor is not called more than once. */
#include <stdatomic.h>
#include <stdio.h>
#include <stdlib.h>
#include <support/check.h>
#include <support/xthread.h>
#include <support/xunistd.h>
#include <sys/wait.h>
#include <unistd.h>
static atomic_int registered;
static atomic_int todo = 100000;
static void
atexit_cb (void *arg)
{
atomic_fetch_sub (®istered, 1);
static void *prev;
if (arg == prev)
FAIL_EXIT1 ("%s: %p\n", __func__, arg);
prev = arg;
while (atomic_load (&todo) > 0 && atomic_load (®istered) < 100)
;
}
int __cxa_atexit (void (*func) (void *), void *arg, void *d);
static void *
thread_func (void *arg)
{
void *cb_arg = NULL;
while (atomic_load (&todo) > 0)
{
if (atomic_load (®istered) < 10000)
{
int n = 10;
for (int i = 0; i < n; ++i)
__cxa_atexit (&atexit_cb, ++cb_arg, 0);
atomic_fetch_add (®istered, n);
atomic_fetch_sub (&todo, n);
}
}
return NULL;
}
_Noreturn static void
test_and_exit (void)
{
pthread_attr_t attr;
xpthread_attr_init (&attr);
xpthread_attr_setdetachstate (&attr, 1);
xpthread_create (&attr, thread_func, NULL);
xpthread_attr_destroy (&attr);
while (atomic_load (®istered) == 0)
;
exit (0);
}
static int
do_test (void)
{
for (int i = 0; i < 20; ++i)
{
for (int i = 0; i < 10; ++i)
if (xfork () == 0)
test_and_exit ();
for (int i = 0; i < 10; ++i)
{
int status;
xwaitpid (0, &status, 0);
if (!WIFEXITED (status))
FAIL_EXIT1 ("Failed iterations %d", i);
TEST_COMPARE (WEXITSTATUS (status), 0);
}
}
return 0;
}
#define TEST_FUNCTION do_test
#include <support/test-driver.c>
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