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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 | } |