1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
/* Verify that pthread_create does not deadlock when ctors take locks.
Copyright (C) 2021-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <support/xdlfcn.h>
#include <support/xthread.h>
/*
Check if ctor and pthread_create deadlocks in
thread 1: dlopen -> ctor -> lock(user_lock)
thread 2: lock(user_lock) -> pthread_create
or in
thread 1: dlclose -> dtor -> lock(user_lock)
thread 2: lock(user_lock) -> pthread_create
*/
static pthread_barrier_t bar_ctor;
static pthread_barrier_t bar_ctor_finish;
static pthread_barrier_t bar_dtor;
static pthread_mutex_t user_lock = PTHREAD_MUTEX_INITIALIZER;
void
ctor (void)
{
xpthread_barrier_wait (&bar_ctor);
dprintf (1, "thread 1: in ctor: started.\n");
xpthread_mutex_lock (&user_lock);
dprintf (1, "thread 1: in ctor: locked user_lock.\n");
xpthread_mutex_unlock (&user_lock);
dprintf (1, "thread 1: in ctor: unlocked user_lock.\n");
dprintf (1, "thread 1: in ctor: done.\n");
xpthread_barrier_wait (&bar_ctor_finish);
}
void
dtor (void)
{
xpthread_barrier_wait (&bar_dtor);
dprintf (1, "thread 1: in dtor: started.\n");
xpthread_mutex_lock (&user_lock);
dprintf (1, "thread 1: in dtor: locked user_lock.\n");
xpthread_mutex_unlock (&user_lock);
dprintf (1, "thread 1: in dtor: unlocked user_lock.\n");
dprintf (1, "thread 1: in dtor: done.\n");
}
static void *
thread3 (void *a)
{
dprintf (1, "thread 3: started.\n");
dprintf (1, "thread 3: done.\n");
return 0;
}
static void *
thread2 (void *a)
{
pthread_t t3;
dprintf (1, "thread 2: started.\n");
xpthread_mutex_lock (&user_lock);
dprintf (1, "thread 2: locked user_lock.\n");
xpthread_barrier_wait (&bar_ctor);
t3 = xpthread_create (0, thread3, 0);
xpthread_mutex_unlock (&user_lock);
dprintf (1, "thread 2: unlocked user_lock.\n");
xpthread_join (t3);
xpthread_barrier_wait (&bar_ctor_finish);
xpthread_mutex_lock (&user_lock);
dprintf (1, "thread 2: locked user_lock.\n");
xpthread_barrier_wait (&bar_dtor);
t3 = xpthread_create (0, thread3, 0);
xpthread_mutex_unlock (&user_lock);
dprintf (1, "thread 2: unlocked user_lock.\n");
xpthread_join (t3);
dprintf (1, "thread 2: done.\n");
return 0;
}
static void
thread1 (void)
{
dprintf (1, "thread 1: started.\n");
xpthread_barrier_init (&bar_ctor, NULL, 2);
xpthread_barrier_init (&bar_ctor_finish, NULL, 2);
xpthread_barrier_init (&bar_dtor, NULL, 2);
pthread_t t2 = xpthread_create (0, thread2, 0);
void *p = xdlopen ("tst-create1mod.so", RTLD_NOW | RTLD_GLOBAL);
dprintf (1, "thread 1: dlopen done.\n");
xdlclose (p);
dprintf (1, "thread 1: dlclose done.\n");
xpthread_join (t2);
dprintf (1, "thread 1: done.\n");
}
static int
do_test (void)
{
thread1 ();
return 0;
}
#include <support/test-driver.c>
|
