| 1 | /* |
| 2 | * test_urcu_fork.c |
| 3 | * |
| 4 | * Userspace RCU library - test program (fork) |
| 5 | * |
| 6 | * Copyright February 2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along |
| 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 21 | */ |
| 22 | |
| 23 | #define _GNU_SOURCE |
| 24 | #include "../config.h" |
| 25 | #include <stdio.h> |
| 26 | #include <pthread.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <string.h> |
| 29 | #include <sys/types.h> |
| 30 | #include <sys/wait.h> |
| 31 | #include <unistd.h> |
| 32 | #include <stdio.h> |
| 33 | #include <assert.h> |
| 34 | #include <sched.h> |
| 35 | #include <errno.h> |
| 36 | |
| 37 | #include <urcu/arch.h> |
| 38 | #include <urcu/tls-compat.h> |
| 39 | |
| 40 | #ifndef DYNAMIC_LINK_TEST |
| 41 | #define _LGPL_SOURCE |
| 42 | #else |
| 43 | #define rcu_debug_yield_read() |
| 44 | #endif |
| 45 | #include <urcu.h> |
| 46 | |
| 47 | struct test_node { |
| 48 | int somedata; |
| 49 | struct rcu_head head; |
| 50 | }; |
| 51 | |
| 52 | static void cb(struct rcu_head *head) |
| 53 | { |
| 54 | struct test_node *node; |
| 55 | |
| 56 | fprintf(stderr, "rcu callback invoked in pid: %d\n", |
| 57 | (int) getpid()); |
| 58 | node = caa_container_of(head, struct test_node, head); |
| 59 | free(node); |
| 60 | } |
| 61 | |
| 62 | static void test_rcu(void) |
| 63 | { |
| 64 | struct test_node *node; |
| 65 | |
| 66 | rcu_register_thread(); |
| 67 | |
| 68 | synchronize_rcu(); |
| 69 | |
| 70 | rcu_read_lock(); |
| 71 | rcu_read_unlock(); |
| 72 | |
| 73 | node = malloc(sizeof(*node)); |
| 74 | assert(node); |
| 75 | |
| 76 | call_rcu(&node->head, cb); |
| 77 | |
| 78 | synchronize_rcu(); |
| 79 | |
| 80 | rcu_unregister_thread(); |
| 81 | } |
| 82 | |
| 83 | int main(int argc, char **argv) |
| 84 | { |
| 85 | pid_t pid; |
| 86 | int ret; |
| 87 | |
| 88 | #if 0 |
| 89 | /* pthread_atfork does not work with malloc/free in callbacks */ |
| 90 | ret = pthread_atfork(call_rcu_before_fork, |
| 91 | call_rcu_after_fork_parent, |
| 92 | call_rcu_after_fork_child); |
| 93 | if (ret) { |
| 94 | errno = ret; |
| 95 | perror("pthread_atfork"); |
| 96 | exit(EXIT_FAILURE); |
| 97 | } |
| 98 | #endif |
| 99 | |
| 100 | test_rcu(); |
| 101 | |
| 102 | synchronize_rcu(); |
| 103 | |
| 104 | fprintf(stderr, "%s parent pid: %d, before fork\n", |
| 105 | argv[0], (int) getpid()); |
| 106 | |
| 107 | call_rcu_before_fork(); |
| 108 | pid = fork(); |
| 109 | |
| 110 | if (pid == 0) { |
| 111 | /* child */ |
| 112 | call_rcu_after_fork_child(); |
| 113 | fprintf(stderr, "%s child pid: %d, after fork\n", |
| 114 | argv[0], (int) getpid()); |
| 115 | test_rcu(); |
| 116 | fprintf(stderr, "%s child pid: %d, after rcu test\n", |
| 117 | argv[0], (int) getpid()); |
| 118 | } else if (pid > 0) { |
| 119 | int status; |
| 120 | |
| 121 | /* parent */ |
| 122 | call_rcu_after_fork_parent(); |
| 123 | fprintf(stderr, "%s parent pid: %d, after fork\n", |
| 124 | argv[0], (int) getpid()); |
| 125 | test_rcu(); |
| 126 | fprintf(stderr, "%s parent pid: %d, after rcu test\n", |
| 127 | argv[0], (int) getpid()); |
| 128 | for (;;) { |
| 129 | pid = wait(&status); |
| 130 | if (WIFEXITED(status)) { |
| 131 | fprintf(stderr, "child %u exited normally with status %u\n", |
| 132 | pid, WEXITSTATUS(status)); |
| 133 | break; |
| 134 | } else if (WIFSIGNALED(status)) { |
| 135 | fprintf(stderr, "child %u was terminated by signal %u\n", |
| 136 | pid, WTERMSIG(status)); |
| 137 | break; |
| 138 | } else { |
| 139 | continue; |
| 140 | } |
| 141 | } |
| 142 | } else { |
| 143 | perror("fork"); |
| 144 | exit(EXIT_FAILURE); |
| 145 | } |
| 146 | exit(EXIT_SUCCESS); |
| 147 | } |