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1 | /* Verify that TLS access in separate thread in a dlopened library does not |
2 | deadlock. | |
04277e02 | 3 | Copyright (C) 2015-2019 Free Software Foundation, Inc. |
e400f3cc SP |
4 | This file is part of the GNU C Library. |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
e400f3cc SP |
19 | |
20 | #include <dlfcn.h> | |
21 | ||
22 | /* When one dynamically loads a module, which spawns a thread to perform some | |
23 | activities, it could be possible that TLS storage is accessed for the first | |
24 | time in that thread. This results in an allocation request within the | |
25 | thread, which could result in an attempt to take the rtld load_lock. This | |
26 | is a problem because it would then deadlock with the dlopen (which owns the | |
27 | lock), if the main thread is waiting for the spawned thread to exit. We can | |
28 | at least ensure that this problem does not occur due to accesses within | |
29 | libc.so, by marking TLS variables within libc.so as IE. The problem of an | |
30 | arbitrary variable being accessed and constructed within such a thread still | |
31 | exists but this test case does not verify that. */ | |
32 | ||
33 | int | |
34 | do_test (void) | |
35 | { | |
36 | void *f = dlopen ("tst-join7mod.so", RTLD_NOW | RTLD_GLOBAL); | |
37 | if (f) | |
38 | dlclose (f); | |
39 | else | |
40 | return 1; | |
41 | ||
42 | return 0; | |
43 | } | |
44 | ||
45 | #define TEST_FUNCTION do_test () | |
46 | #include "../test-skeleton.c" |