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019bf21c | 1 | /* Tests process-shared barriers. |
d614a753 | 2 | Copyright (C) 2002-2020 Free Software Foundation, Inc. |
76a50749 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
76a50749 UD |
19 | |
20 | #include <errno.h> | |
21 | #include <pthread.h> | |
22 | #include <stdint.h> | |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <unistd.h> | |
27 | #include <sys/mman.h> | |
28 | #include <sys/wait.h> | |
29 | ||
30 | ||
b910f788 RM |
31 | static int |
32 | do_test (void) | |
76a50749 UD |
33 | { |
34 | size_t ps = sysconf (_SC_PAGESIZE); | |
35 | char tmpfname[] = "/tmp/tst-barrier2.XXXXXX"; | |
36 | char data[ps]; | |
37 | void *mem; | |
38 | int fd; | |
39 | pthread_barrier_t *b; | |
40 | pthread_barrierattr_t a; | |
41 | pid_t pid; | |
42 | int serials = 0; | |
43 | int cnt; | |
44 | int status; | |
45 | int p; | |
46 | ||
47 | fd = mkstemp (tmpfname); | |
48 | if (fd == -1) | |
49 | { | |
50 | printf ("cannot open temporary file: %m\n"); | |
b910f788 | 51 | return 1; |
76a50749 UD |
52 | } |
53 | ||
54 | /* Make sure it is always removed. */ | |
55 | unlink (tmpfname); | |
56 | ||
57 | /* Create one page of data. */ | |
58 | memset (data, '\0', ps); | |
59 | ||
60 | /* Write the data to the file. */ | |
f9657e88 | 61 | if (write (fd, data, ps) != (ssize_t) ps) |
76a50749 UD |
62 | { |
63 | puts ("short write"); | |
b910f788 | 64 | return 1; |
76a50749 UD |
65 | } |
66 | ||
67 | mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); | |
68 | if (mem == MAP_FAILED) | |
69 | { | |
70 | printf ("mmap failed: %m\n"); | |
b910f788 | 71 | return 1; |
76a50749 UD |
72 | } |
73 | ||
74 | b = (pthread_barrier_t *) (((uintptr_t) mem + __alignof (pthread_barrier_t)) | |
75 | & ~(__alignof (pthread_barrier_t) - 1)); | |
76 | ||
77 | if (pthread_barrierattr_init (&a) != 0) | |
78 | { | |
79 | puts ("barrierattr_init failed"); | |
b910f788 | 80 | return 1; |
76a50749 UD |
81 | } |
82 | ||
83 | if (pthread_barrierattr_getpshared (&a, &p) != 0) | |
84 | { | |
85 | puts ("1st barrierattr_getpshared failed"); | |
b910f788 | 86 | return 1; |
76a50749 UD |
87 | } |
88 | ||
89 | if (p != PTHREAD_PROCESS_PRIVATE) | |
90 | { | |
91 | puts ("default pshared value wrong"); | |
b910f788 | 92 | return 1; |
76a50749 UD |
93 | } |
94 | ||
95 | if (pthread_barrierattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0) | |
96 | { | |
97 | puts ("barrierattr_setpshared failed"); | |
b910f788 | 98 | return 1; |
76a50749 UD |
99 | } |
100 | ||
101 | if (pthread_barrierattr_getpshared (&a, &p) != 0) | |
102 | { | |
103 | puts ("2nd barrierattr_getpshared failed"); | |
b910f788 | 104 | return 1; |
76a50749 UD |
105 | } |
106 | ||
107 | if (p != PTHREAD_PROCESS_SHARED) | |
108 | { | |
109 | puts ("pshared value after setpshared call wrong"); | |
b910f788 | 110 | return 1; |
76a50749 UD |
111 | } |
112 | ||
113 | if (pthread_barrier_init (b, &a, 2) != 0) | |
114 | { | |
115 | puts ("barrier_init failed"); | |
b910f788 | 116 | return 1; |
76a50749 UD |
117 | } |
118 | ||
119 | if (pthread_barrierattr_destroy (&a) != 0) | |
120 | { | |
121 | puts ("barrierattr_destroy failed"); | |
b910f788 | 122 | return 1; |
76a50749 UD |
123 | } |
124 | ||
125 | puts ("going to fork now"); | |
126 | pid = fork (); | |
127 | if (pid == -1) | |
128 | { | |
129 | puts ("fork failed"); | |
b910f788 | 130 | return 1; |
76a50749 UD |
131 | } |
132 | ||
133 | /* Just to be sure we don't hang forever. */ | |
134 | alarm (4); | |
135 | ||
136 | #define N 30 | |
137 | for (cnt = 0; cnt < N; ++cnt) | |
138 | { | |
139 | int e; | |
140 | ||
141 | e = pthread_barrier_wait (b); | |
142 | if (e == PTHREAD_BARRIER_SERIAL_THREAD) | |
143 | ++serials; | |
144 | else if (e != 0) | |
145 | { | |
146 | printf ("%s: barrier_wait returned value %d != 0 and PTHREAD_BARRIER_SERIAL_THREAD\n", | |
147 | pid == 0 ? "child" : "parent", e); | |
b910f788 | 148 | return 1; |
76a50749 UD |
149 | } |
150 | } | |
151 | ||
152 | alarm (0); | |
153 | ||
154 | printf ("%s: was %d times the serial thread\n", | |
155 | pid == 0 ? "child" : "parent", serials); | |
156 | ||
157 | if (pid == 0) | |
158 | /* The child. Pass the number of times we had the serializing | |
159 | thread back to the parent. */ | |
160 | exit (serials); | |
161 | ||
162 | if (waitpid (pid, &status, 0) != pid) | |
163 | { | |
164 | puts ("waitpid failed"); | |
165 | return 1; | |
166 | } | |
167 | ||
168 | if (!WIFEXITED (status)) | |
169 | { | |
170 | puts ("child exited abnormally"); | |
171 | return 1; | |
172 | } | |
173 | ||
174 | if (WEXITSTATUS (status) + serials != N) | |
175 | { | |
176 | printf ("total number of serials is %d, expected %d\n", | |
177 | WEXITSTATUS (status) + serials, N); | |
178 | return 1; | |
179 | } | |
180 | ||
b910f788 | 181 | return 0; |
76a50749 | 182 | } |
b910f788 RM |
183 | |
184 | #define TEST_FUNCTION do_test () | |
185 | #include "../test-skeleton.c" |