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e5e4d7cc | 1 | /* Test for exit/dlclose race (Bug 22180). |
6d7e8eda | 2 | Copyright (C) 2017-2023 Free Software Foundation, Inc. |
e5e4d7cc PP |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
e5e4d7cc PP |
18 | |
19 | /* This file must be run from within a directory called "stdlib". */ | |
20 | ||
21 | /* This test verifies that when dlopen in one thread races against exit | |
22 | in another thread, we don't call registered destructor twice. | |
23 | ||
24 | Expected result: | |
25 | second | |
26 | first | |
27 | ... clean termination | |
28 | */ | |
29 | ||
30 | #include <stdio.h> | |
31 | #include <stdlib.h> | |
ac30324c | 32 | #include <errno.h> |
e5e4d7cc PP |
33 | #include <semaphore.h> |
34 | #include <support/check.h> | |
35 | #include <support/xdlfcn.h> | |
36 | #include <support/xthread.h> | |
37 | ||
38 | /* Semaphore to ensure we have a happens-before between the first function | |
39 | starting and exit being called. */ | |
40 | sem_t order1; | |
41 | ||
42 | /* Semaphore to ensure we have a happens-before between the second function | |
43 | starting and the first function returning. */ | |
44 | sem_t order2; | |
45 | ||
46 | void * | |
47 | exit_thread (void *arg) | |
48 | { | |
49 | /* Wait for the dlclose to start... */ | |
50 | sem_wait (&order1); | |
51 | /* Then try to run the exit sequence which should call all | |
52 | __cxa_atexit registered functions and in parallel with | |
53 | the executing dlclose(). */ | |
54 | exit (0); | |
55 | } | |
56 | ||
57 | ||
58 | void | |
59 | last (void) | |
60 | { | |
61 | /* Let dlclose thread proceed. */ | |
62 | sem_post (&order2); | |
63 | } | |
64 | ||
65 | int | |
66 | main (void) | |
67 | { | |
ac30324c | 68 | int value; |
e5e4d7cc PP |
69 | void *dso; |
70 | pthread_t thread; | |
71 | ||
72 | atexit (last); | |
73 | ||
74 | dso = xdlopen ("$ORIGIN/test-dlclose-exit-race-helper.so", | |
75 | RTLD_NOW|RTLD_GLOBAL); | |
ac30324c DD |
76 | if ((value = pthread_create (&thread, NULL, exit_thread, NULL)) != 0) |
77 | { | |
78 | /* If pthread_create fails, then exit() is called in the main | |
79 | thread instead of a second thread, so the semaphore post that | |
80 | would have happened in 'last' gets blocked behind the call to | |
81 | first() - which is waiting on the semaphore, and thus | |
82 | hangs. */ | |
83 | sem_post (&order2); | |
84 | errno = value; | |
85 | FAIL_EXIT1 ("pthread_create: %m"); | |
86 | } | |
e5e4d7cc PP |
87 | |
88 | xdlclose (dso); | |
89 | xpthread_join (thread); | |
90 | ||
91 | FAIL_EXIT1 ("Did not terminate via exit(0) in exit_thread() as expected."); | |
92 | } |