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25988c86 MD |
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> | |
25988c86 MD |
38 | |
39 | #ifndef DYNAMIC_LINK_TEST | |
40 | #define _LGPL_SOURCE | |
41 | #else | |
42 | #define rcu_debug_yield_read() | |
43 | #endif | |
44 | #include <urcu.h> | |
45 | ||
46 | struct test_node { | |
47 | int somedata; | |
48 | struct rcu_head head; | |
49 | }; | |
50 | ||
51 | static void cb(struct rcu_head *head) | |
52 | { | |
53 | struct test_node *node; | |
54 | ||
55 | fprintf(stderr, "rcu callback invoked in pid: %d\n", | |
56 | (int) getpid()); | |
57 | node = caa_container_of(head, struct test_node, head); | |
58 | free(node); | |
59 | } | |
60 | ||
61 | static void test_rcu(void) | |
62 | { | |
63 | struct test_node *node; | |
64 | ||
65 | rcu_register_thread(); | |
66 | ||
67 | synchronize_rcu(); | |
68 | ||
69 | rcu_read_lock(); | |
70 | rcu_read_unlock(); | |
71 | ||
72 | node = malloc(sizeof(*node)); | |
73 | assert(node); | |
74 | ||
75 | call_rcu(&node->head, cb); | |
76 | ||
77 | synchronize_rcu(); | |
78 | ||
79 | rcu_unregister_thread(); | |
80 | } | |
81 | ||
82 | int main(int argc, char **argv) | |
83 | { | |
84 | pid_t pid; | |
85 | int ret; | |
86 | ||
87 | #if 0 | |
88 | /* pthread_atfork does not work with malloc/free in callbacks */ | |
89 | ret = pthread_atfork(call_rcu_before_fork, | |
90 | call_rcu_after_fork_parent, | |
91 | call_rcu_after_fork_child); | |
92 | if (ret) { | |
93 | errno = ret; | |
94 | perror("pthread_atfork"); | |
95 | exit(EXIT_FAILURE); | |
96 | } | |
97 | #endif | |
98 | ||
99 | test_rcu(); | |
100 | ||
101 | synchronize_rcu(); | |
102 | ||
103 | fprintf(stderr, "%s parent pid: %d, before fork\n", | |
104 | argv[0], (int) getpid()); | |
105 | ||
106 | call_rcu_before_fork(); | |
107 | pid = fork(); | |
108 | ||
109 | if (pid == 0) { | |
110 | /* child */ | |
111 | call_rcu_after_fork_child(); | |
112 | fprintf(stderr, "%s child pid: %d, after fork\n", | |
113 | argv[0], (int) getpid()); | |
114 | test_rcu(); | |
115 | fprintf(stderr, "%s child pid: %d, after rcu test\n", | |
116 | argv[0], (int) getpid()); | |
117 | } else if (pid > 0) { | |
118 | int status; | |
119 | ||
120 | /* parent */ | |
121 | call_rcu_after_fork_parent(); | |
122 | fprintf(stderr, "%s parent pid: %d, after fork\n", | |
123 | argv[0], (int) getpid()); | |
124 | test_rcu(); | |
125 | fprintf(stderr, "%s parent pid: %d, after rcu test\n", | |
126 | argv[0], (int) getpid()); | |
127 | for (;;) { | |
128 | pid = wait(&status); | |
129 | if (WIFEXITED(status)) { | |
130 | fprintf(stderr, "child %u exited normally with status %u\n", | |
131 | pid, WEXITSTATUS(status)); | |
132 | break; | |
133 | } else if (WIFSIGNALED(status)) { | |
134 | fprintf(stderr, "child %u was terminated by signal %u\n", | |
135 | pid, WTERMSIG(status)); | |
136 | break; | |
137 | } else { | |
138 | continue; | |
139 | } | |
140 | } | |
141 | } else { | |
142 | perror("fork"); | |
143 | exit(EXIT_FAILURE); | |
144 | } | |
145 | exit(EXIT_SUCCESS); | |
146 | } |