1/* Test concurrent dlopen and pthread_create: BZ 19329.
2 Copyright (C) 2021-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <dlfcn.h>
20#include <pthread.h>
21#include <stdio.h>
22#include <stdatomic.h>
23#include <support/xdlfcn.h>
24#include <support/xthread.h>
25
26#define THREADS 10000
27
28static atomic_int done;
29
30static void *
31start (void *a)
32{
33 /* Load a module with many dependencies that each have TLS. */
34 xdlopen (filename: "tst-tls21mod.so", RTLD_LAZY);
35 atomic_store_explicit (&done, 1, memory_order_release);
36 return 0;
37}
38
39static void *
40nop (void *a)
41{
42 return 0;
43}
44
45static int
46do_test (void)
47{
48 pthread_t t1, t2;
49 int i;
50
51 /* Load a module with lots of dependencies and TLS. */
52 t1 = xpthread_create (attr: 0, thread_func: start, closure: 0);
53
54 /* Concurrently create lots of threads until dlopen is observably done. */
55 for (i = 0; i < THREADS; i++)
56 {
57 if (atomic_load_explicit (&done, memory_order_acquire) != 0)
58 break;
59 t2 = xpthread_create (attr: 0, thread_func: nop, closure: 0);
60 xpthread_join (thr: t2);
61 }
62
63 xpthread_join (thr: t1);
64 printf (format: "threads created during dlopen: %d\n", i);
65 return 0;
66}
67
68#include <support/test-driver.c>
69

source code of glibc/elf/tst-tls21.c