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581c785b | 1 | /* Copyright (C) 2002-2022 Free Software Foundation, Inc. |
76a50749 | 2 | This file is part of the GNU C Library. |
76a50749 UD |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
76a50749 UD |
17 | |
18 | #include <errno.h> | |
19 | #include <pthread.h> | |
20 | #include <stdint.h> | |
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <unistd.h> | |
25 | #include <sys/mman.h> | |
26 | #include <sys/wait.h> | |
27 | ||
28 | ||
b910f788 RM |
29 | static int |
30 | do_test (void) | |
76a50749 UD |
31 | { |
32 | size_t ps = sysconf (_SC_PAGESIZE); | |
33 | char tmpfname[] = "/tmp/tst-rwlock4.XXXXXX"; | |
34 | char data[ps]; | |
35 | void *mem; | |
36 | int fd; | |
37 | pthread_rwlock_t *r; | |
38 | pthread_rwlockattr_t a; | |
39 | pid_t pid; | |
40 | char *p; | |
41 | int err; | |
42 | int s; | |
43 | ||
44 | fd = mkstemp (tmpfname); | |
45 | if (fd == -1) | |
46 | { | |
47 | printf ("cannot open temporary file: %m\n"); | |
b910f788 | 48 | return 1; |
76a50749 UD |
49 | } |
50 | ||
51 | /* Make sure it is always removed. */ | |
52 | unlink (tmpfname); | |
53 | ||
54 | /* Create one page of data. */ | |
55 | memset (data, '\0', ps); | |
56 | ||
57 | /* Write the data to the file. */ | |
f9657e88 | 58 | if (write (fd, data, ps) != (ssize_t) ps) |
76a50749 UD |
59 | { |
60 | puts ("short write"); | |
b910f788 | 61 | return 1; |
76a50749 UD |
62 | } |
63 | ||
64 | mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); | |
65 | if (mem == MAP_FAILED) | |
66 | { | |
67 | printf ("mmap failed: %m\n"); | |
b910f788 | 68 | return 1; |
76a50749 UD |
69 | } |
70 | ||
71 | r = (pthread_rwlock_t *) (((uintptr_t) mem + __alignof (pthread_rwlock_t)) | |
72 | & ~(__alignof (pthread_rwlock_t) - 1)); | |
73 | p = (char *) (r + 1); | |
74 | ||
75 | if (pthread_rwlockattr_init (&a) != 0) | |
76 | { | |
77 | puts ("rwlockattr_init failed"); | |
b910f788 | 78 | return 1; |
76a50749 UD |
79 | } |
80 | ||
81 | if (pthread_rwlockattr_getpshared (&a, &s) != 0) | |
82 | { | |
83 | puts ("1st rwlockattr_getpshared failed"); | |
b910f788 | 84 | return 1; |
76a50749 UD |
85 | } |
86 | ||
87 | if (s != PTHREAD_PROCESS_PRIVATE) | |
88 | { | |
89 | puts ("default pshared value wrong"); | |
b910f788 | 90 | return 1; |
76a50749 UD |
91 | } |
92 | ||
93 | if (pthread_rwlockattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0) | |
94 | { | |
95 | puts ("rwlockattr_setpshared failed"); | |
b910f788 | 96 | return 1; |
76a50749 UD |
97 | } |
98 | ||
99 | if (pthread_rwlockattr_getpshared (&a, &s) != 0) | |
100 | { | |
101 | puts ("2nd rwlockattr_getpshared failed"); | |
b910f788 | 102 | return 1; |
76a50749 UD |
103 | } |
104 | ||
105 | if (s != PTHREAD_PROCESS_SHARED) | |
106 | { | |
107 | puts ("pshared value after setpshared call wrong"); | |
b910f788 | 108 | return 1; |
76a50749 UD |
109 | } |
110 | ||
111 | if (pthread_rwlock_init (r, &a) != 0) | |
112 | { | |
113 | puts ("rwlock_init failed"); | |
b910f788 | 114 | return 1; |
76a50749 UD |
115 | } |
116 | ||
117 | if (pthread_rwlock_rdlock (r) != 0) | |
118 | { | |
119 | puts ("rwlock_rdlock failed"); | |
b910f788 | 120 | return 1; |
76a50749 UD |
121 | } |
122 | ||
123 | if (pthread_rwlockattr_destroy (&a) != 0) | |
124 | { | |
125 | puts ("rwlockattr_destroy failed"); | |
b910f788 | 126 | return 1; |
76a50749 UD |
127 | } |
128 | ||
129 | err = pthread_rwlock_trywrlock (r); | |
130 | if (err == 0) | |
131 | { | |
132 | puts ("rwlock_trywrlock succeeded"); | |
b910f788 | 133 | return 1; |
76a50749 UD |
134 | } |
135 | else if (err != EBUSY) | |
136 | { | |
137 | puts ("rwlock_trywrlock didn't return EBUSY"); | |
b910f788 | 138 | return 1; |
76a50749 UD |
139 | } |
140 | ||
141 | *p = 0; | |
142 | ||
143 | puts ("going to fork now"); | |
144 | pid = fork (); | |
145 | if (pid == -1) | |
146 | { | |
147 | puts ("fork failed"); | |
b910f788 | 148 | return 1; |
76a50749 UD |
149 | } |
150 | else if (pid == 0) | |
151 | { | |
152 | /* Play some lock ping-pong. It's our turn to unlock first. */ | |
153 | if ((*p)++ != 0) | |
154 | { | |
155 | puts ("child: *p != 0"); | |
b910f788 | 156 | return 1; |
76a50749 UD |
157 | } |
158 | ||
159 | if (pthread_rwlock_unlock (r) != 0) | |
160 | { | |
161 | puts ("child: 1st rwlock_unlock failed"); | |
b910f788 | 162 | return 1; |
76a50749 UD |
163 | } |
164 | ||
165 | puts ("child done"); | |
166 | } | |
167 | else | |
168 | { | |
169 | if (pthread_rwlock_wrlock (r) != 0) | |
170 | { | |
171 | puts ("parent: rwlock_wrlock failed"); | |
b910f788 | 172 | return 1; |
76a50749 UD |
173 | } |
174 | ||
175 | if (*p != 1) | |
176 | { | |
177 | puts ("*p != 1"); | |
b910f788 | 178 | return 1; |
76a50749 UD |
179 | } |
180 | ||
181 | puts ("parent done"); | |
182 | } | |
183 | ||
b910f788 | 184 | return 0; |
76a50749 | 185 | } |
b910f788 RM |
186 | |
187 | #define TEST_FUNCTION do_test () | |
188 | #include "../test-skeleton.c" |