lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Copyright (C) 2002-2015 Free Software Foundation, Inc. |
| 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 |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 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 | |
| 30 | static int |
| 31 | do_test (void) |
| 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"); |
| 50 | return 1; |
| 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. */ |
| 60 | if (write (fd, data, ps) != (ssize_t) ps) |
| 61 | { |
| 62 | puts ("short write"); |
| 63 | return 1; |
| 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"); |
| 70 | return 1; |
| 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"); |
| 79 | return 1; |
| 80 | } |
| 81 | |
| 82 | if (pthread_barrierattr_getpshared (&a, &p) != 0) |
| 83 | { |
| 84 | puts ("1st barrierattr_getpshared failed"); |
| 85 | return 1; |
| 86 | } |
| 87 | |
| 88 | if (p != PTHREAD_PROCESS_PRIVATE) |
| 89 | { |
| 90 | puts ("default pshared value wrong"); |
| 91 | return 1; |
| 92 | } |
| 93 | |
| 94 | if (pthread_barrierattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0) |
| 95 | { |
| 96 | puts ("barrierattr_setpshared failed"); |
| 97 | return 1; |
| 98 | } |
| 99 | |
| 100 | if (pthread_barrierattr_getpshared (&a, &p) != 0) |
| 101 | { |
| 102 | puts ("2nd barrierattr_getpshared failed"); |
| 103 | return 1; |
| 104 | } |
| 105 | |
| 106 | if (p != PTHREAD_PROCESS_SHARED) |
| 107 | { |
| 108 | puts ("pshared value after setpshared call wrong"); |
| 109 | return 1; |
| 110 | } |
| 111 | |
| 112 | if (pthread_barrier_init (b, &a, 2) != 0) |
| 113 | { |
| 114 | puts ("barrier_init failed"); |
| 115 | return 1; |
| 116 | } |
| 117 | |
| 118 | if (pthread_barrierattr_destroy (&a) != 0) |
| 119 | { |
| 120 | puts ("barrierattr_destroy failed"); |
| 121 | return 1; |
| 122 | } |
| 123 | |
| 124 | puts ("going to fork now"); |
| 125 | pid = fork (); |
| 126 | if (pid == -1) |
| 127 | { |
| 128 | puts ("fork failed"); |
| 129 | return 1; |
| 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); |
| 147 | return 1; |
| 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 | |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | #define TEST_FUNCTION do_test () |
| 184 | #include "../test-skeleton.c" |