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20bf310a MD |
1 | /* |
2 | * test_urcu.c | |
3 | * | |
4 | * Userspace RCU library - test program | |
5 | * | |
6982d6d7 | 6 | * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
20bf310a | 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> | |
94b343fd | 31 | #include <errno.h> |
01477510 | 32 | |
ec4e58a3 | 33 | #include <urcu/arch.h> |
01477510 | 34 | #include <urcu/assert.h> |
20bf310a | 35 | |
94df6318 | 36 | #include "thread-id.h" |
20bf310a | 37 | |
121a5d44 | 38 | #define _LGPL_SOURCE |
ec4e58a3 | 39 | #include <urcu.h> |
20bf310a | 40 | |
c265818b MD |
41 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; |
42 | ||
61c3fb60 | 43 | static |
c265818b MD |
44 | void rcu_copy_mutex_lock(void) |
45 | { | |
46 | int ret; | |
47 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
48 | if (ret) { | |
49 | perror("Error in pthread mutex lock"); | |
50 | exit(-1); | |
51 | } | |
52 | } | |
53 | ||
61c3fb60 | 54 | static |
c265818b MD |
55 | void rcu_copy_mutex_unlock(void) |
56 | { | |
57 | int ret; | |
58 | ||
59 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
60 | if (ret) { | |
61 | perror("Error in pthread mutex unlock"); | |
62 | exit(-1); | |
63 | } | |
64 | } | |
65 | ||
20bf310a MD |
66 | struct test_array { |
67 | int a; | |
68 | }; | |
69 | ||
70 | static struct test_array *test_rcu_pointer; | |
71 | ||
72 | #define OUTER_READ_LOOP 2000U | |
73 | #define INNER_READ_LOOP 100000U | |
74 | #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP) | |
75 | ||
102d1d23 MD |
76 | #define OUTER_WRITE_LOOP 10U |
77 | #define INNER_WRITE_LOOP 200U | |
78 | #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP) | |
20bf310a | 79 | |
2c9689fe MD |
80 | static int num_read; |
81 | static int num_write; | |
20bf310a | 82 | |
2c9689fe MD |
83 | #define NR_READ num_read |
84 | #define NR_WRITE num_write | |
85 | ||
3fa18286 MD |
86 | static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time; |
87 | static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time; | |
20bf310a | 88 | |
61c3fb60 | 89 | static |
20bf310a MD |
90 | void *thr_reader(void *arg) |
91 | { | |
83e334d0 | 92 | unsigned int i, j; |
20bf310a | 93 | struct test_array *local_ptr; |
3fa18286 | 94 | caa_cycles_t time1, time2; |
20bf310a | 95 | |
94df6318 MD |
96 | printf("thread_begin %s, tid %lu\n", |
97 | "reader", urcu_get_thread_id()); | |
20bf310a MD |
98 | sleep(2); |
99 | ||
121a5d44 | 100 | rcu_register_thread(); |
20bf310a | 101 | |
06f22bdb | 102 | time1 = caa_get_cycles(); |
20bf310a MD |
103 | for (i = 0; i < OUTER_READ_LOOP; i++) { |
104 | for (j = 0; j < INNER_READ_LOOP; j++) { | |
1430ee0b | 105 | rcu_read_lock(); |
20bf310a MD |
106 | local_ptr = rcu_dereference(test_rcu_pointer); |
107 | if (local_ptr) { | |
01477510 | 108 | urcu_posix_assert(local_ptr->a == 8); |
20bf310a | 109 | } |
1430ee0b | 110 | rcu_read_unlock(); |
20bf310a MD |
111 | } |
112 | } | |
06f22bdb | 113 | time2 = caa_get_cycles(); |
20bf310a | 114 | |
121a5d44 | 115 | rcu_unregister_thread(); |
20bf310a MD |
116 | |
117 | reader_time[(unsigned long)arg] = time2 - time1; | |
118 | ||
119 | sleep(2); | |
94df6318 MD |
120 | printf("thread_end %s, tid %lu\n", |
121 | "reader", urcu_get_thread_id()); | |
20bf310a MD |
122 | return ((void*)1); |
123 | ||
124 | } | |
125 | ||
61c3fb60 | 126 | static |
20bf310a MD |
127 | void *thr_writer(void *arg) |
128 | { | |
83e334d0 | 129 | unsigned int i, j; |
20bf310a | 130 | struct test_array *new, *old; |
3fa18286 | 131 | caa_cycles_t time1, time2; |
20bf310a | 132 | |
94df6318 MD |
133 | printf("thread_begin %s, tid %lu\n", |
134 | "writer", urcu_get_thread_id()); | |
20bf310a MD |
135 | sleep(2); |
136 | ||
102d1d23 | 137 | for (i = 0; i < OUTER_WRITE_LOOP; i++) { |
102d1d23 | 138 | for (j = 0; j < INNER_WRITE_LOOP; j++) { |
06f22bdb | 139 | time1 = caa_get_cycles(); |
102d1d23 MD |
140 | new = malloc(sizeof(struct test_array)); |
141 | rcu_copy_mutex_lock(); | |
142 | old = test_rcu_pointer; | |
143 | if (old) { | |
01477510 | 144 | urcu_posix_assert(old->a == 8); |
102d1d23 MD |
145 | } |
146 | new->a = 8; | |
d2835e6f | 147 | old = rcu_xchg_pointer(&test_rcu_pointer, new); |
102d1d23 | 148 | rcu_copy_mutex_unlock(); |
d2835e6f | 149 | synchronize_rcu(); |
102d1d23 MD |
150 | /* can be done after unlock */ |
151 | if (old) { | |
152 | old->a = 0; | |
153 | } | |
154 | free(old); | |
06f22bdb | 155 | time2 = caa_get_cycles(); |
fc606a74 MD |
156 | writer_time[(unsigned long)arg] += time2 - time1; |
157 | usleep(1); | |
20bf310a | 158 | } |
20bf310a MD |
159 | } |
160 | ||
94df6318 MD |
161 | printf("thread_end %s, tid %lu\n", |
162 | "writer", urcu_get_thread_id()); | |
20bf310a MD |
163 | return ((void*)2); |
164 | } | |
165 | ||
2c9689fe | 166 | int main(int argc, char **argv) |
20bf310a MD |
167 | { |
168 | int err; | |
2c9689fe | 169 | pthread_t *tid_reader, *tid_writer; |
20bf310a MD |
170 | void *tret; |
171 | int i; | |
3fa18286 MD |
172 | caa_cycles_t tot_rtime = 0; |
173 | caa_cycles_t tot_wtime = 0; | |
20bf310a | 174 | |
2c9689fe MD |
175 | if (argc < 2) { |
176 | printf("Usage : %s nr_readers nr_writers\n", argv[0]); | |
177 | exit(-1); | |
178 | } | |
179 | num_read = atoi(argv[1]); | |
180 | num_write = atoi(argv[2]); | |
181 | ||
9aa14175 MD |
182 | reader_time = calloc(num_read, sizeof(*reader_time)); |
183 | writer_time = calloc(num_write, sizeof(*writer_time)); | |
184 | tid_reader = calloc(num_read, sizeof(*tid_reader)); | |
185 | tid_writer = calloc(num_write, sizeof(*tid_writer)); | |
2c9689fe | 186 | |
94df6318 MD |
187 | printf("thread %-6s, tid %lu\n", |
188 | "main", urcu_get_thread_id()); | |
20bf310a MD |
189 | |
190 | for (i = 0; i < NR_READ; i++) { | |
191 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
192 | (void *)(long)i); | |
193 | if (err != 0) | |
194 | exit(1); | |
195 | } | |
196 | for (i = 0; i < NR_WRITE; i++) { | |
102d1d23 MD |
197 | err = pthread_create(&tid_writer[i], NULL, thr_writer, |
198 | (void *)(long)i); | |
20bf310a MD |
199 | if (err != 0) |
200 | exit(1); | |
201 | } | |
202 | ||
203 | sleep(10); | |
204 | ||
205 | for (i = 0; i < NR_READ; i++) { | |
206 | err = pthread_join(tid_reader[i], &tret); | |
207 | if (err != 0) | |
208 | exit(1); | |
102d1d23 | 209 | tot_rtime += reader_time[i]; |
20bf310a MD |
210 | } |
211 | for (i = 0; i < NR_WRITE; i++) { | |
212 | err = pthread_join(tid_writer[i], &tret); | |
213 | if (err != 0) | |
214 | exit(1); | |
102d1d23 | 215 | tot_wtime += writer_time[i]; |
20bf310a MD |
216 | } |
217 | free(test_rcu_pointer); | |
218 | printf("Time per read : %g cycles\n", | |
102d1d23 MD |
219 | (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP)); |
220 | printf("Time per write : %g cycles\n", | |
221 | (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP)); | |
20bf310a | 222 | |
2c9689fe MD |
223 | free(reader_time); |
224 | free(writer_time); | |
225 | free(tid_reader); | |
226 | free(tid_writer); | |
227 | ||
20bf310a MD |
228 | return 0; |
229 | } |