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1/* Copyright (C) 2002-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <errno.h>
20#include <pthread.h>
21#include <stdint.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25#include <unistd.h>
26#include <sys/mman.h>
27#include <sys/wait.h>
28
29
30static int
31do_test (void)
32{
33 size_t ps = sysconf (_SC_PAGESIZE);
34 char tmpfname[] = "/tmp/tst-rwlock4.XXXXXX";
35 char data[ps];
36 void *mem;
37 int fd;
38 pthread_rwlock_t *r;
39 pthread_rwlockattr_t a;
40 pid_t pid;
41 char *p;
42 int err;
43 int s;
44
45 fd = mkstemp (tmpfname);
46 if (fd == -1)
47 {
48 printf ("cannot open temporary file: %m\n");
49 return 1;
50 }
51
52 /* Make sure it is always removed. */
53 unlink (tmpfname);
54
55 /* Create one page of data. */
56 memset (data, '\0', ps);
57
58 /* Write the data to the file. */
59 if (write (fd, data, ps) != (ssize_t) ps)
60 {
61 puts ("short write");
62 return 1;
63 }
64
65 mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
66 if (mem == MAP_FAILED)
67 {
68 printf ("mmap failed: %m\n");
69 return 1;
70 }
71
72 r = (pthread_rwlock_t *) (((uintptr_t) mem + __alignof (pthread_rwlock_t))
73 & ~(__alignof (pthread_rwlock_t) - 1));
74 p = (char *) (r + 1);
75
76 if (pthread_rwlockattr_init (&a) != 0)
77 {
78 puts ("rwlockattr_init failed");
79 return 1;
80 }
81
82 if (pthread_rwlockattr_getpshared (&a, &s) != 0)
83 {
84 puts ("1st rwlockattr_getpshared failed");
85 return 1;
86 }
87
88 if (s != PTHREAD_PROCESS_PRIVATE)
89 {
90 puts ("default pshared value wrong");
91 return 1;
92 }
93
94 if (pthread_rwlockattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
95 {
96 puts ("rwlockattr_setpshared failed");
97 return 1;
98 }
99
100 if (pthread_rwlockattr_getpshared (&a, &s) != 0)
101 {
102 puts ("2nd rwlockattr_getpshared failed");
103 return 1;
104 }
105
106 if (s != PTHREAD_PROCESS_SHARED)
107 {
108 puts ("pshared value after setpshared call wrong");
109 return 1;
110 }
111
112 if (pthread_rwlock_init (r, &a) != 0)
113 {
114 puts ("rwlock_init failed");
115 return 1;
116 }
117
118 if (pthread_rwlock_rdlock (r) != 0)
119 {
120 puts ("rwlock_rdlock failed");
121 return 1;
122 }
123
124 if (pthread_rwlockattr_destroy (&a) != 0)
125 {
126 puts ("rwlockattr_destroy failed");
127 return 1;
128 }
129
130 err = pthread_rwlock_trywrlock (r);
131 if (err == 0)
132 {
133 puts ("rwlock_trywrlock succeeded");
134 return 1;
135 }
136 else if (err != EBUSY)
137 {
138 puts ("rwlock_trywrlock didn't return EBUSY");
139 return 1;
140 }
141
142 *p = 0;
143
144 puts ("going to fork now");
145 pid = fork ();
146 if (pid == -1)
147 {
148 puts ("fork failed");
149 return 1;
150 }
151 else if (pid == 0)
152 {
153 /* Play some lock ping-pong. It's our turn to unlock first. */
154 if ((*p)++ != 0)
155 {
156 puts ("child: *p != 0");
157 return 1;
158 }
159
160 if (pthread_rwlock_unlock (r) != 0)
161 {
162 puts ("child: 1st rwlock_unlock failed");
163 return 1;
164 }
165
166 puts ("child done");
167 }
168 else
169 {
170 if (pthread_rwlock_wrlock (r) != 0)
171 {
172 puts ("parent: rwlock_wrlock failed");
173 return 1;
174 }
175
176 if (*p != 1)
177 {
178 puts ("*p != 1");
179 return 1;
180 }
181
182 puts ("parent done");
183 }
184
185 return 0;
186}
187
188#define TEST_FUNCTION do_test ()
189#include "../test-skeleton.c"
190

Warning: That file was not part of the compilation database. It may have many parsing errors.