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9d0e3032 | 1 | /* Test concurrent dlopen and pthread_create: BZ 19329. |
581c785b | 2 | Copyright (C) 2021-2022 Free Software Foundation, Inc. |
9d0e3032 SN |
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 ("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 (0, start, 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 (0, nop, 0); | |
60 | xpthread_join (t2); | |
61 | } | |
62 | ||
63 | xpthread_join (t1); | |
64 | printf ("threads created during dlopen: %d\n", i); | |
65 | return 0; | |
66 | } | |
67 | ||
68 | #include <support/test-driver.c> |