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
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/* Test support for single-thread optimizations. With threads.
Copyright (C) 2020-2025 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 <stddef.h>
#include <stdio.h>
#include <support/check.h>
#include <support/namespace.h>
#include <support/xdlfcn.h>
#include <support/xthread.h>
#include <sys/single_threaded.h>
/* First barrier synchronizes main thread, thread 1, thread 2. */
static pthread_barrier_t barrier1;
/* Second barrier synchronizes main thread, thread 2. */
static pthread_barrier_t barrier2;
/* Defined in tst-single-threaded-mod1.so. */
_Bool single_threaded_1 (void);
/* Initialized via dlsym. */
static _Bool (*single_threaded_2) (void);
static _Bool (*single_threaded_3) (void);
static _Bool (*single_threaded_4) (void);
static void *
threadfunc (void *closure)
{
TEST_VERIFY (!__libc_single_threaded);
TEST_VERIFY (!single_threaded_1 ());
TEST_VERIFY (!single_threaded_2 ());
/* Wait until the main thread loads more functions. */
xpthread_barrier_wait (&barrier1);
TEST_VERIFY (!__libc_single_threaded);
TEST_VERIFY (!single_threaded_1 ());
TEST_VERIFY (!single_threaded_2 ());
TEST_VERIFY (!single_threaded_3 ());
TEST_VERIFY (!single_threaded_4 ());
/* Second thread waits on second barrier, too. */
if (closure != NULL)
xpthread_barrier_wait (&barrier2);
TEST_VERIFY (!__libc_single_threaded);
TEST_VERIFY (!single_threaded_1 ());
TEST_VERIFY (!single_threaded_2 ());
TEST_VERIFY (!single_threaded_3 ());
TEST_VERIFY (!single_threaded_4 ());
return NULL;
}
/* Used for closure arguments to the subprocess function. */
static char expected_false = 0;
static char expected_true = 1;
/* A subprocess inherits currently inherits the single-threaded state
of the parent process. */
static void
subprocess (void *closure)
{
const char *expected = closure;
TEST_COMPARE (__libc_single_threaded, *expected);
TEST_COMPARE (single_threaded_1 (), *expected);
if (single_threaded_2 != NULL)
TEST_COMPARE (single_threaded_2 (), *expected);
if (single_threaded_3 != NULL)
TEST_COMPARE (single_threaded_3 (), *expected);
if (single_threaded_4 != NULL)
TEST_VERIFY (!single_threaded_4 ());
}
static int
do_test (void)
{
printf ("info: main __libc_single_threaded address: %p\n",
&__libc_single_threaded);
TEST_VERIFY (__libc_single_threaded);
TEST_VERIFY (single_threaded_1 ());
support_isolate_in_subprocess (subprocess, &expected_true);
void *handle_mod2 = xdlopen ("tst-single_threaded-mod2.so", RTLD_LAZY);
single_threaded_2 = xdlsym (handle_mod2, "single_threaded_2");
TEST_VERIFY (single_threaded_2 ());
/* Two threads plus main thread. */
xpthread_barrier_init (&barrier1, NULL, 3);
/* Main thread and second thread. */
xpthread_barrier_init (&barrier2, NULL, 2);
pthread_t thr1 = xpthread_create (NULL, threadfunc, NULL);
TEST_VERIFY (!__libc_single_threaded);
TEST_VERIFY (!single_threaded_1 ());
TEST_VERIFY (!single_threaded_2 ());
support_isolate_in_subprocess (subprocess, &expected_false);
pthread_t thr2 = xpthread_create (NULL, threadfunc, &thr2);
TEST_VERIFY (!__libc_single_threaded);
TEST_VERIFY (!single_threaded_1 ());
TEST_VERIFY (!single_threaded_2 ());
support_isolate_in_subprocess (subprocess, &expected_false);
/* Delayed library load, while already multi-threaded. */
void *handle_mod3 = xdlopen ("tst-single_threaded-mod3.so", RTLD_LAZY);
single_threaded_3 = xdlsym (handle_mod3, "single_threaded_3");
TEST_VERIFY (!__libc_single_threaded);
TEST_VERIFY (!single_threaded_1 ());
TEST_VERIFY (!single_threaded_2 ());
TEST_VERIFY (!single_threaded_3 ());
support_isolate_in_subprocess (subprocess, &expected_false);
/* Same with dlmopen. */
void *handle_mod4 = dlmopen (LM_ID_NEWLM, "tst-single_threaded-mod4.so",
RTLD_LAZY);
single_threaded_4 = xdlsym (handle_mod4, "single_threaded_4");
TEST_VERIFY (!__libc_single_threaded);
TEST_VERIFY (!single_threaded_1 ());
TEST_VERIFY (!single_threaded_2 ());
TEST_VERIFY (!single_threaded_3 ());
TEST_VERIFY (!single_threaded_4 ());
support_isolate_in_subprocess (subprocess, &expected_false);
/* Run the newly loaded functions from the other threads as
well. */
xpthread_barrier_wait (&barrier1);
TEST_VERIFY (!__libc_single_threaded);
TEST_VERIFY (!single_threaded_1 ());
TEST_VERIFY (!single_threaded_2 ());
TEST_VERIFY (!single_threaded_3 ());
TEST_VERIFY (!single_threaded_4 ());
support_isolate_in_subprocess (subprocess, &expected_false);
/* Join first thread. This should not bring us back into
single-threaded mode. */
xpthread_join (thr1);
TEST_VERIFY (!__libc_single_threaded);
TEST_VERIFY (!single_threaded_1 ());
TEST_VERIFY (!single_threaded_2 ());
TEST_VERIFY (!single_threaded_3 ());
TEST_VERIFY (!single_threaded_4 ());
support_isolate_in_subprocess (subprocess, &expected_false);
/* We may be back in single-threaded mode after joining both
threads, but this is not guaranteed. */
xpthread_barrier_wait (&barrier2);
xpthread_join (thr2);
printf ("info: __libc_single_threaded after joining all threads: %d\n",
__libc_single_threaded);
xdlclose (handle_mod4);
xdlclose (handle_mod3);
xdlclose (handle_mod2);
return 0;
}
#include <support/test-driver.c>
|
