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019bf21c | 1 | /* Tests process-shared barriers. |
2b778ceb | 2 | Copyright (C) 2002-2021 Free Software Foundation, Inc. |
76a50749 | 3 | This file is part of the GNU C Library. |
76a50749 UD |
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 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://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-barrier2.XXXXXX"; | |
35 | char data[ps]; | |
36 | void *mem; | |
37 | int fd; | |
38 | pthread_barrier_t *b; | |
39 | pthread_barrierattr_t a; | |
40 | pid_t pid; | |
41 | int serials = 0; | |
42 | int cnt; | |
43 | int status; | |
44 | int p; | |
45 | ||
46 | fd = mkstemp (tmpfname); | |
47 | if (fd == -1) | |
48 | { | |
49 | printf ("cannot open temporary file: %m\n"); | |
b910f788 | 50 | return 1; |
76a50749 UD |
51 | } |
52 | ||
53 | /* Make sure it is always removed. */ | |
54 | unlink (tmpfname); | |
55 | ||
56 | /* Create one page of data. */ | |
57 | memset (data, '\0', ps); | |
58 | ||
59 | /* Write the data to the file. */ | |
f9657e88 | 60 | if (write (fd, data, ps) != (ssize_t) ps) |
76a50749 UD |
61 | { |
62 | puts ("short write"); | |
b910f788 | 63 | return 1; |
76a50749 UD |
64 | } |
65 | ||
66 | mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); | |
67 | if (mem == MAP_FAILED) | |
68 | { | |
69 | printf ("mmap failed: %m\n"); | |
b910f788 | 70 | return 1; |
76a50749 UD |
71 | } |
72 | ||
73 | b = (pthread_barrier_t *) (((uintptr_t) mem + __alignof (pthread_barrier_t)) | |
74 | & ~(__alignof (pthread_barrier_t) - 1)); | |
75 | ||
76 | if (pthread_barrierattr_init (&a) != 0) | |
77 | { | |
78 | puts ("barrierattr_init failed"); | |
b910f788 | 79 | return 1; |
76a50749 UD |
80 | } |
81 | ||
82 | if (pthread_barrierattr_getpshared (&a, &p) != 0) | |
83 | { | |
84 | puts ("1st barrierattr_getpshared failed"); | |
b910f788 | 85 | return 1; |
76a50749 UD |
86 | } |
87 | ||
88 | if (p != PTHREAD_PROCESS_PRIVATE) | |
89 | { | |
90 | puts ("default pshared value wrong"); | |
b910f788 | 91 | return 1; |
76a50749 UD |
92 | } |
93 | ||
94 | if (pthread_barrierattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0) | |
95 | { | |
96 | puts ("barrierattr_setpshared failed"); | |
b910f788 | 97 | return 1; |
76a50749 UD |
98 | } |
99 | ||
100 | if (pthread_barrierattr_getpshared (&a, &p) != 0) | |
101 | { | |
102 | puts ("2nd barrierattr_getpshared failed"); | |
b910f788 | 103 | return 1; |
76a50749 UD |
104 | } |
105 | ||
106 | if (p != PTHREAD_PROCESS_SHARED) | |
107 | { | |
108 | puts ("pshared value after setpshared call wrong"); | |
b910f788 | 109 | return 1; |
76a50749 UD |
110 | } |
111 | ||
112 | if (pthread_barrier_init (b, &a, 2) != 0) | |
113 | { | |
114 | puts ("barrier_init failed"); | |
b910f788 | 115 | return 1; |
76a50749 UD |
116 | } |
117 | ||
118 | if (pthread_barrierattr_destroy (&a) != 0) | |
119 | { | |
120 | puts ("barrierattr_destroy failed"); | |
b910f788 | 121 | return 1; |
76a50749 UD |
122 | } |
123 | ||
124 | puts ("going to fork now"); | |
125 | pid = fork (); | |
126 | if (pid == -1) | |
127 | { | |
128 | puts ("fork failed"); | |
b910f788 | 129 | return 1; |
76a50749 UD |
130 | } |
131 | ||
132 | /* Just to be sure we don't hang forever. */ | |
133 | alarm (4); | |
134 | ||
135 | #define N 30 | |
136 | for (cnt = 0; cnt < N; ++cnt) | |
137 | { | |
138 | int e; | |
139 | ||
140 | e = pthread_barrier_wait (b); | |
141 | if (e == PTHREAD_BARRIER_SERIAL_THREAD) | |
142 | ++serials; | |
143 | else if (e != 0) | |
144 | { | |
145 | printf ("%s: barrier_wait returned value %d != 0 and PTHREAD_BARRIER_SERIAL_THREAD\n", | |
146 | pid == 0 ? "child" : "parent", e); | |
b910f788 | 147 | return 1; |
76a50749 UD |
148 | } |
149 | } | |
150 | ||
151 | alarm (0); | |
152 | ||
153 | printf ("%s: was %d times the serial thread\n", | |
154 | pid == 0 ? "child" : "parent", serials); | |
155 | ||
156 | if (pid == 0) | |
157 | /* The child. Pass the number of times we had the serializing | |
158 | thread back to the parent. */ | |
159 | exit (serials); | |
160 | ||
161 | if (waitpid (pid, &status, 0) != pid) | |
162 | { | |
163 | puts ("waitpid failed"); | |
164 | return 1; | |
165 | } | |
166 | ||
167 | if (!WIFEXITED (status)) | |
168 | { | |
169 | puts ("child exited abnormally"); | |
170 | return 1; | |
171 | } | |
172 | ||
173 | if (WEXITSTATUS (status) + serials != N) | |
174 | { | |
175 | printf ("total number of serials is %d, expected %d\n", | |
176 | WEXITSTATUS (status) + serials, N); | |
177 | return 1; | |
178 | } | |
179 | ||
b910f788 | 180 | return 0; |
76a50749 | 181 | } |
b910f788 RM |
182 | |
183 | #define TEST_FUNCTION do_test () | |
184 | #include "../test-skeleton.c" |