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e5e4d7cc | 1 | /* Helper for exit/dlclose race test (Bug 22180). |
688903eb | 2 | Copyright (C) 2017-2018 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 | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <stdio.h> | |
20 | #include <stdbool.h> | |
21 | #include <stdlib.h> | |
22 | #include <semaphore.h> | |
23 | #include <unistd.h> | |
24 | #include <support/check.h> | |
25 | #include <support/xthread.h> | |
26 | ||
27 | /* Semaphore defined in executable to ensure we have a happens-before | |
28 | between the first function starting and exit being called. */ | |
29 | extern sem_t order1; | |
30 | ||
31 | /* Semaphore defined in executable to ensure we have a happens-before | |
32 | between the second function starting and the first function returning. */ | |
33 | extern sem_t order2; | |
34 | ||
35 | /* glibc function for registering DSO-specific exit functions. */ | |
36 | extern int __cxa_atexit (void (*func) (void *), void *arg, void *dso_handle); | |
37 | ||
38 | /* Hidden compiler handle to this shared object. */ | |
39 | extern void *__dso_handle __attribute__ ((__weak__)); | |
40 | ||
41 | static void | |
42 | first (void *start) | |
43 | { | |
44 | /* Let the exiting thread run. */ | |
45 | sem_post (&order1); | |
46 | ||
47 | /* Wait for exiting thread to finish. */ | |
48 | sem_wait (&order2); | |
49 | ||
50 | printf ("first\n"); | |
51 | } | |
52 | ||
53 | static void | |
54 | second (void *start) | |
55 | { | |
56 | /* We may be called from different threads. | |
57 | This lock protects called. */ | |
58 | static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER; | |
59 | static bool called = false; | |
60 | ||
61 | xpthread_mutex_lock (&mtx); | |
62 | if (called) | |
63 | FAIL_EXIT1 ("second called twice!"); | |
64 | ||
65 | called = true; | |
66 | xpthread_mutex_unlock (&mtx); | |
67 | ||
68 | printf ("second\n"); | |
69 | } | |
70 | ||
71 | ||
72 | __attribute__ ((constructor)) static void | |
73 | constructor (void) | |
74 | { | |
75 | sem_init (&order1, 0, 0); | |
76 | sem_init (&order2, 0, 0); | |
77 | __cxa_atexit (second, NULL, __dso_handle); | |
78 | __cxa_atexit (first, NULL, __dso_handle); | |
79 | } |