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1/* Tests process-shared barriers.
2 Copyright (C) 2002-2019 Free Software Foundation, Inc.
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
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
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
31static int
32do_test (void)
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");
51 return 1;
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. */
61 if (write (fd, data, ps) != (ssize_t) ps)
62 {
63 puts ("short write");
64 return 1;
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");
71 return 1;
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");
80 return 1;
81 }
82
83 if (pthread_barrierattr_getpshared (&a, &p) != 0)
84 {
85 puts ("1st barrierattr_getpshared failed");
86 return 1;
87 }
88
89 if (p != PTHREAD_PROCESS_PRIVATE)
90 {
91 puts ("default pshared value wrong");
92 return 1;
93 }
94
95 if (pthread_barrierattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
96 {
97 puts ("barrierattr_setpshared failed");
98 return 1;
99 }
100
101 if (pthread_barrierattr_getpshared (&a, &p) != 0)
102 {
103 puts ("2nd barrierattr_getpshared failed");
104 return 1;
105 }
106
107 if (p != PTHREAD_PROCESS_SHARED)
108 {
109 puts ("pshared value after setpshared call wrong");
110 return 1;
111 }
112
113 if (pthread_barrier_init (b, &a, 2) != 0)
114 {
115 puts ("barrier_init failed");
116 return 1;
117 }
118
119 if (pthread_barrierattr_destroy (&a) != 0)
120 {
121 puts ("barrierattr_destroy failed");
122 return 1;
123 }
124
125 puts ("going to fork now");
126 pid = fork ();
127 if (pid == -1)
128 {
129 puts ("fork failed");
130 return 1;
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);
148 return 1;
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
181 return 0;
182}
183
184#define TEST_FUNCTION do_test ()
185#include "../test-skeleton.c"
186

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