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
|
/* Copyright (C) 2004-2024 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 <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
static pthread_mutex_t mut = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
static pthread_mutex_t mut2 = PTHREAD_MUTEX_INITIALIZER;
static void *
tf (void *p)
{
if (pthread_mutex_lock (&mut) != 0)
{
printf ("%s: 1st mutex_lock failed\n", __func__);
exit (1);
}
if (pthread_mutex_lock (&mut) != 0)
{
printf ("%s: 2nd mutex_lock failed\n", __func__);
exit (1);
}
if (pthread_mutex_lock (&mut) != 0)
{
printf ("%s: 3rd mutex_lock failed\n", __func__);
exit (1);
}
if (pthread_mutex_unlock (&mut2) != 0)
{
printf ("%s: mutex_unlock failed\n", __func__);
exit (1);
}
if (pthread_cond_wait (&cond, &mut) != 0)
{
printf ("%s: cond_wait failed\n", __func__);
exit (1);
}
puts ("child: done");
return NULL;
}
static int
do_test (void)
{
if (pthread_mutex_lock (&mut2) != 0)
{
puts ("1st mutex_lock failed");
return 1;
}
puts ("parent: create child");
pthread_t th;
int err = pthread_create (&th, NULL, tf, NULL);
if (err != 0)
{
printf ("parent: cannot create thread: %s\n", strerror (err));
return 1;
}
/* We have to synchronize with the child. */
if (pthread_mutex_lock (&mut2) != 0)
{
puts ("2nd mutex_lock failed");
return 1;
}
/* Give the child to reach to pthread_cond_wait. */
sleep (1);
if (pthread_cond_signal (&cond) != 0)
{
puts ("cond_signal failed");
return 1;
}
err = pthread_join (th, NULL);
if (err != 0)
{
printf ("parent: failed to join: %s\n", strerror (err));
return 1;
}
puts ("done");
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
|
