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