1 | /* Test concurrent dlopen and pthread_create: BZ 19329. |
2 | Copyright (C) 2021-2024 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 | |
28 | static atomic_int done; |
29 | |
30 | static void * |
31 | start (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 | |
39 | static void * |
40 | nop (void *a) |
41 | { |
42 | return 0; |
43 | } |
44 | |
45 | static int |
46 | do_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 | |