xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 2002-2016 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 <error.h> |
| 20 | #include <pthread.h> |
| 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> |
| 23 | |
| 24 | |
| 25 | static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER; |
| 26 | static pthread_cond_t cond = PTHREAD_COND_INITIALIZER; |
| 27 | |
| 28 | static pthread_barrier_t bar; |
| 29 | |
| 30 | |
| 31 | static void * |
| 32 | tf (void *a) |
| 33 | { |
| 34 | int i = (long int) a; |
| 35 | int err; |
| 36 | |
| 37 | printf ("child %d: lock\n", i); |
| 38 | |
| 39 | err = pthread_mutex_lock (&mut); |
| 40 | if (err != 0) |
| 41 | error (EXIT_FAILURE, err, "locking in child failed"); |
| 42 | |
| 43 | printf ("child %d: sync\n", i); |
| 44 | |
| 45 | int e = pthread_barrier_wait (&bar); |
| 46 | if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD) |
| 47 | { |
| 48 | puts ("child: barrier_wait failed"); |
| 49 | exit (1); |
| 50 | } |
| 51 | |
| 52 | printf ("child %d: wait\n", i); |
| 53 | |
| 54 | err = pthread_cond_wait (&cond, &mut); |
| 55 | if (err != 0) |
| 56 | error (EXIT_FAILURE, err, "child %d: failed to wait", i); |
| 57 | |
| 58 | printf ("child %d: woken up\n", i); |
| 59 | |
| 60 | err = pthread_mutex_unlock (&mut); |
| 61 | if (err != 0) |
| 62 | error (EXIT_FAILURE, err, "child %d: unlock[2] failed", i); |
| 63 | |
| 64 | printf ("child %d: done\n", i); |
| 65 | |
| 66 | return NULL; |
| 67 | } |
| 68 | |
| 69 | |
| 70 | #define N 10 |
| 71 | |
| 72 | |
| 73 | static int |
| 74 | do_test (void) |
| 75 | { |
| 76 | pthread_t th[N]; |
| 77 | int i; |
| 78 | int err; |
| 79 | |
| 80 | printf ("&cond = %p\n&mut = %p\n", &cond, &mut); |
| 81 | |
| 82 | if (pthread_barrier_init (&bar, NULL, 2) != 0) |
| 83 | { |
| 84 | puts ("barrier_init failed"); |
| 85 | exit (1); |
| 86 | } |
| 87 | |
| 88 | pthread_attr_t at; |
| 89 | |
| 90 | if (pthread_attr_init (&at) != 0) |
| 91 | { |
| 92 | puts ("attr_init failed"); |
| 93 | return 1; |
| 94 | } |
| 95 | |
| 96 | if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0) |
| 97 | { |
| 98 | puts ("attr_setstacksize failed"); |
| 99 | return 1; |
| 100 | } |
| 101 | |
| 102 | for (i = 0; i < N; ++i) |
| 103 | { |
| 104 | printf ("create thread %d\n", i); |
| 105 | |
| 106 | err = pthread_create (&th[i], &at, tf, (void *) (long int) i); |
| 107 | if (err != 0) |
| 108 | error (EXIT_FAILURE, err, "cannot create thread %d", i); |
| 109 | |
| 110 | printf ("wait for child %d\n", i); |
| 111 | |
| 112 | /* Wait for the child to start up and get the mutex for the |
| 113 | conditional variable. */ |
| 114 | int e = pthread_barrier_wait (&bar); |
| 115 | if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD) |
| 116 | { |
| 117 | puts ("barrier_wait failed"); |
| 118 | exit (1); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | if (pthread_attr_destroy (&at) != 0) |
| 123 | { |
| 124 | puts ("attr_destroy failed"); |
| 125 | return 1; |
| 126 | } |
| 127 | |
| 128 | puts ("get lock outselves"); |
| 129 | |
| 130 | err = pthread_mutex_lock (&mut); |
| 131 | if (err != 0) |
| 132 | error (EXIT_FAILURE, err, "mut locking failed"); |
| 133 | |
| 134 | puts ("broadcast"); |
| 135 | |
| 136 | /* Wake up all threads. */ |
| 137 | err = pthread_cond_broadcast (&cond); |
| 138 | if (err != 0) |
| 139 | error (EXIT_FAILURE, err, "parent: broadcast failed"); |
| 140 | |
| 141 | err = pthread_mutex_unlock (&mut); |
| 142 | if (err != 0) |
| 143 | error (EXIT_FAILURE, err, "mut unlocking failed"); |
| 144 | |
| 145 | /* Join all threads. */ |
| 146 | for (i = 0; i < N; ++i) |
| 147 | { |
| 148 | printf ("join thread %d\n", i); |
| 149 | |
| 150 | err = pthread_join (th[i], NULL); |
| 151 | if (err != 0) |
| 152 | error (EXIT_FAILURE, err, "join of child %d failed", i); |
| 153 | } |
| 154 | |
| 155 | puts ("done"); |
| 156 | |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | |
| 161 | #define TEST_FUNCTION do_test () |
| 162 | #include "../test-skeleton.c" |