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/* Test concurrent dlopen and pthread_create: BZ 19329.
Copyright (C) 2021 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
<http://www.gnu.org/licenses/>. */
#include <dlfcn.h>
#include <pthread.h>
#include <stdio.h>
#include <stdatomic.h>
#include <support/xdlfcn.h>
#include <support/xthread.h>
#define THREADS 10000
static atomic_int done;
static void *
start (void *a)
{
/* Load a module with many dependencies that each have TLS. */
xdlopen ("tst-tls21mod.so", RTLD_LAZY);
atomic_store_explicit (&done, 1, memory_order_release);
return 0;
}
static void *
nop (void *a)
{
return 0;
}
static int
do_test (void)
{
pthread_t t1, t2;
int i;
/* Load a module with lots of dependencies and TLS. */
t1 = xpthread_create (0, start, 0);
/* Concurrently create lots of threads until dlopen is observably done. */
for (i = 0; i < THREADS; i++)
{
if (atomic_load_explicit (&done, memory_order_acquire) != 0)
break;
t2 = xpthread_create (0, nop, 0);
xpthread_join (t2);
}
xpthread_join (t1);
printf ("threads created during dlopen: %d\n", i);
return 0;
}
#include <support/test-driver.c>
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