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20bf310a MD |
1 | /* |
2 | * test_urcu.c | |
3 | * | |
4 | * Userspace RCU library - test program | |
5 | * | |
6 | * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | |
7 | * | |
af02d47e MD |
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. | |
20bf310a MD |
21 | */ |
22 | ||
23 | #include <stdio.h> | |
24 | #include <pthread.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <sys/types.h> | |
28 | #include <sys/wait.h> | |
29 | #include <unistd.h> | |
30 | #include <stdio.h> | |
31 | #include <assert.h> | |
32 | #include <sys/syscall.h> | |
ec4e58a3 | 33 | #include <urcu/arch.h> |
20bf310a MD |
34 | |
35 | #if defined(_syscall0) | |
36 | _syscall0(pid_t, gettid) | |
37 | #elif defined(__NR_gettid) | |
38 | static inline pid_t gettid(void) | |
39 | { | |
40 | return syscall(__NR_gettid); | |
41 | } | |
42 | #else | |
43 | #warning "use pid as tid" | |
44 | static inline pid_t gettid(void) | |
45 | { | |
46 | return getpid(); | |
47 | } | |
48 | #endif | |
49 | ||
121a5d44 | 50 | #define _LGPL_SOURCE |
ec4e58a3 | 51 | #include <urcu.h> |
20bf310a | 52 | |
c265818b MD |
53 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; |
54 | ||
55 | void rcu_copy_mutex_lock(void) | |
56 | { | |
57 | int ret; | |
58 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
59 | if (ret) { | |
60 | perror("Error in pthread mutex lock"); | |
61 | exit(-1); | |
62 | } | |
63 | } | |
64 | ||
65 | void rcu_copy_mutex_unlock(void) | |
66 | { | |
67 | int ret; | |
68 | ||
69 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
70 | if (ret) { | |
71 | perror("Error in pthread mutex unlock"); | |
72 | exit(-1); | |
73 | } | |
74 | } | |
75 | ||
20bf310a MD |
76 | struct test_array { |
77 | int a; | |
78 | }; | |
79 | ||
80 | static struct test_array *test_rcu_pointer; | |
81 | ||
82 | #define OUTER_READ_LOOP 2000U | |
83 | #define INNER_READ_LOOP 100000U | |
84 | #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP) | |
85 | ||
102d1d23 MD |
86 | #define OUTER_WRITE_LOOP 10U |
87 | #define INNER_WRITE_LOOP 200U | |
88 | #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP) | |
20bf310a | 89 | |
2c9689fe MD |
90 | static int num_read; |
91 | static int num_write; | |
20bf310a | 92 | |
2c9689fe MD |
93 | #define NR_READ num_read |
94 | #define NR_WRITE num_write | |
95 | ||
b430c6d4 MD |
96 | static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *reader_time; |
97 | static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *writer_time; | |
20bf310a MD |
98 | |
99 | void *thr_reader(void *arg) | |
100 | { | |
1430ee0b | 101 | int i, j; |
20bf310a MD |
102 | struct test_array *local_ptr; |
103 | cycles_t time1, time2; | |
104 | ||
105 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
106 | "reader", pthread_self(), (unsigned long)gettid()); | |
107 | sleep(2); | |
108 | ||
121a5d44 | 109 | rcu_register_thread(); |
20bf310a MD |
110 | |
111 | time1 = get_cycles(); | |
112 | for (i = 0; i < OUTER_READ_LOOP; i++) { | |
113 | for (j = 0; j < INNER_READ_LOOP; j++) { | |
1430ee0b | 114 | rcu_read_lock(); |
20bf310a MD |
115 | local_ptr = rcu_dereference(test_rcu_pointer); |
116 | if (local_ptr) { | |
117 | assert(local_ptr->a == 8); | |
118 | } | |
1430ee0b | 119 | rcu_read_unlock(); |
20bf310a MD |
120 | } |
121 | } | |
122 | time2 = get_cycles(); | |
123 | ||
121a5d44 | 124 | rcu_unregister_thread(); |
20bf310a MD |
125 | |
126 | reader_time[(unsigned long)arg] = time2 - time1; | |
127 | ||
128 | sleep(2); | |
129 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
130 | "reader", pthread_self(), (unsigned long)gettid()); | |
131 | return ((void*)1); | |
132 | ||
133 | } | |
134 | ||
135 | void *thr_writer(void *arg) | |
136 | { | |
102d1d23 | 137 | int i, j; |
20bf310a | 138 | struct test_array *new, *old; |
102d1d23 | 139 | cycles_t time1, time2; |
20bf310a MD |
140 | |
141 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
142 | "writer", pthread_self(), (unsigned long)gettid()); | |
143 | sleep(2); | |
144 | ||
102d1d23 | 145 | for (i = 0; i < OUTER_WRITE_LOOP; i++) { |
102d1d23 | 146 | for (j = 0; j < INNER_WRITE_LOOP; j++) { |
fc606a74 | 147 | time1 = get_cycles(); |
102d1d23 MD |
148 | new = malloc(sizeof(struct test_array)); |
149 | rcu_copy_mutex_lock(); | |
150 | old = test_rcu_pointer; | |
151 | if (old) { | |
152 | assert(old->a == 8); | |
153 | } | |
154 | new->a = 8; | |
d2835e6f | 155 | old = rcu_xchg_pointer(&test_rcu_pointer, new); |
102d1d23 | 156 | rcu_copy_mutex_unlock(); |
d2835e6f | 157 | synchronize_rcu(); |
102d1d23 MD |
158 | /* can be done after unlock */ |
159 | if (old) { | |
160 | old->a = 0; | |
161 | } | |
162 | free(old); | |
fc606a74 MD |
163 | time2 = get_cycles(); |
164 | writer_time[(unsigned long)arg] += time2 - time1; | |
165 | usleep(1); | |
20bf310a | 166 | } |
20bf310a MD |
167 | } |
168 | ||
169 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
170 | "writer", pthread_self(), (unsigned long)gettid()); | |
171 | return ((void*)2); | |
172 | } | |
173 | ||
2c9689fe | 174 | int main(int argc, char **argv) |
20bf310a MD |
175 | { |
176 | int err; | |
2c9689fe | 177 | pthread_t *tid_reader, *tid_writer; |
20bf310a MD |
178 | void *tret; |
179 | int i; | |
102d1d23 MD |
180 | cycles_t tot_rtime = 0; |
181 | cycles_t tot_wtime = 0; | |
20bf310a | 182 | |
2c9689fe MD |
183 | if (argc < 2) { |
184 | printf("Usage : %s nr_readers nr_writers\n", argv[0]); | |
185 | exit(-1); | |
186 | } | |
187 | num_read = atoi(argv[1]); | |
188 | num_write = atoi(argv[2]); | |
189 | ||
190 | reader_time = malloc(sizeof(*reader_time) * num_read); | |
191 | writer_time = malloc(sizeof(*writer_time) * num_write); | |
192 | tid_reader = malloc(sizeof(*tid_reader) * num_read); | |
193 | tid_writer = malloc(sizeof(*tid_writer) * num_write); | |
194 | ||
20bf310a MD |
195 | printf("thread %-6s, thread id : %lx, tid %lu\n", |
196 | "main", pthread_self(), (unsigned long)gettid()); | |
197 | ||
198 | for (i = 0; i < NR_READ; i++) { | |
199 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
200 | (void *)(long)i); | |
201 | if (err != 0) | |
202 | exit(1); | |
203 | } | |
204 | for (i = 0; i < NR_WRITE; i++) { | |
102d1d23 MD |
205 | err = pthread_create(&tid_writer[i], NULL, thr_writer, |
206 | (void *)(long)i); | |
20bf310a MD |
207 | if (err != 0) |
208 | exit(1); | |
209 | } | |
210 | ||
211 | sleep(10); | |
212 | ||
213 | for (i = 0; i < NR_READ; i++) { | |
214 | err = pthread_join(tid_reader[i], &tret); | |
215 | if (err != 0) | |
216 | exit(1); | |
102d1d23 | 217 | tot_rtime += reader_time[i]; |
20bf310a MD |
218 | } |
219 | for (i = 0; i < NR_WRITE; i++) { | |
220 | err = pthread_join(tid_writer[i], &tret); | |
221 | if (err != 0) | |
222 | exit(1); | |
102d1d23 | 223 | tot_wtime += writer_time[i]; |
20bf310a MD |
224 | } |
225 | free(test_rcu_pointer); | |
226 | printf("Time per read : %g cycles\n", | |
102d1d23 MD |
227 | (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP)); |
228 | printf("Time per write : %g cycles\n", | |
229 | (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP)); | |
20bf310a | 230 | |
2c9689fe MD |
231 | free(reader_time); |
232 | free(writer_time); | |
233 | free(tid_reader); | |
234 | free(tid_writer); | |
235 | ||
20bf310a MD |
236 | return 0; |
237 | } |