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bfff8b1b | 1 | /* Copyright (C) 2002-2017 Free Software Foundation, Inc. |
76a50749 UD |
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 | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
76a50749 UD |
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 | ||
b910f788 RM |
30 | static int |
31 | do_test (void) | |
76a50749 UD |
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"); | |
b910f788 | 49 | return 1; |
76a50749 UD |
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. */ | |
f9657e88 | 59 | if (write (fd, data, ps) != (ssize_t) ps) |
76a50749 UD |
60 | { |
61 | puts ("short write"); | |
b910f788 | 62 | return 1; |
76a50749 UD |
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"); | |
b910f788 | 69 | return 1; |
76a50749 UD |
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"); | |
b910f788 | 79 | return 1; |
76a50749 UD |
80 | } |
81 | ||
82 | if (pthread_rwlockattr_getpshared (&a, &s) != 0) | |
83 | { | |
84 | puts ("1st rwlockattr_getpshared failed"); | |
b910f788 | 85 | return 1; |
76a50749 UD |
86 | } |
87 | ||
88 | if (s != PTHREAD_PROCESS_PRIVATE) | |
89 | { | |
90 | puts ("default pshared value wrong"); | |
b910f788 | 91 | return 1; |
76a50749 UD |
92 | } |
93 | ||
94 | if (pthread_rwlockattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0) | |
95 | { | |
96 | puts ("rwlockattr_setpshared failed"); | |
b910f788 | 97 | return 1; |
76a50749 UD |
98 | } |
99 | ||
100 | if (pthread_rwlockattr_getpshared (&a, &s) != 0) | |
101 | { | |
102 | puts ("2nd rwlockattr_getpshared failed"); | |
b910f788 | 103 | return 1; |
76a50749 UD |
104 | } |
105 | ||
106 | if (s != PTHREAD_PROCESS_SHARED) | |
107 | { | |
108 | puts ("pshared value after setpshared call wrong"); | |
b910f788 | 109 | return 1; |
76a50749 UD |
110 | } |
111 | ||
112 | if (pthread_rwlock_init (r, &a) != 0) | |
113 | { | |
114 | puts ("rwlock_init failed"); | |
b910f788 | 115 | return 1; |
76a50749 UD |
116 | } |
117 | ||
118 | if (pthread_rwlock_rdlock (r) != 0) | |
119 | { | |
120 | puts ("rwlock_rdlock failed"); | |
b910f788 | 121 | return 1; |
76a50749 UD |
122 | } |
123 | ||
124 | if (pthread_rwlockattr_destroy (&a) != 0) | |
125 | { | |
126 | puts ("rwlockattr_destroy failed"); | |
b910f788 | 127 | return 1; |
76a50749 UD |
128 | } |
129 | ||
130 | err = pthread_rwlock_trywrlock (r); | |
131 | if (err == 0) | |
132 | { | |
133 | puts ("rwlock_trywrlock succeeded"); | |
b910f788 | 134 | return 1; |
76a50749 UD |
135 | } |
136 | else if (err != EBUSY) | |
137 | { | |
138 | puts ("rwlock_trywrlock didn't return EBUSY"); | |
b910f788 | 139 | return 1; |
76a50749 UD |
140 | } |
141 | ||
142 | *p = 0; | |
143 | ||
144 | puts ("going to fork now"); | |
145 | pid = fork (); | |
146 | if (pid == -1) | |
147 | { | |
148 | puts ("fork failed"); | |
b910f788 | 149 | return 1; |
76a50749 UD |
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"); | |
b910f788 | 157 | return 1; |
76a50749 UD |
158 | } |
159 | ||
160 | if (pthread_rwlock_unlock (r) != 0) | |
161 | { | |
162 | puts ("child: 1st rwlock_unlock failed"); | |
b910f788 | 163 | return 1; |
76a50749 UD |
164 | } |
165 | ||
166 | puts ("child done"); | |
167 | } | |
168 | else | |
169 | { | |
170 | if (pthread_rwlock_wrlock (r) != 0) | |
171 | { | |
172 | puts ("parent: rwlock_wrlock failed"); | |
b910f788 | 173 | return 1; |
76a50749 UD |
174 | } |
175 | ||
176 | if (*p != 1) | |
177 | { | |
178 | puts ("*p != 1"); | |
b910f788 | 179 | return 1; |
76a50749 UD |
180 | } |
181 | ||
182 | puts ("parent done"); | |
183 | } | |
184 | ||
b910f788 | 185 | return 0; |
76a50749 | 186 | } |
b910f788 RM |
187 | |
188 | #define TEST_FUNCTION do_test () | |
189 | #include "../test-skeleton.c" |