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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 | |
65fcc7e9 MD |
35 | #ifdef __linux__ |
36 | #include <syscall.h> | |
37 | #endif | |
38 | ||
20bf310a MD |
39 | #if defined(_syscall0) |
40 | _syscall0(pid_t, gettid) | |
41 | #elif defined(__NR_gettid) | |
42 | static inline pid_t gettid(void) | |
43 | { | |
44 | return syscall(__NR_gettid); | |
45 | } | |
46 | #else | |
47 | #warning "use pid as tid" | |
48 | static inline pid_t gettid(void) | |
49 | { | |
50 | return getpid(); | |
51 | } | |
52 | #endif | |
53 | ||
121a5d44 | 54 | #define _LGPL_SOURCE |
ec4e58a3 | 55 | #include <urcu.h> |
20bf310a | 56 | |
c265818b MD |
57 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; |
58 | ||
59 | void rcu_copy_mutex_lock(void) | |
60 | { | |
61 | int ret; | |
62 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
63 | if (ret) { | |
64 | perror("Error in pthread mutex lock"); | |
65 | exit(-1); | |
66 | } | |
67 | } | |
68 | ||
69 | void rcu_copy_mutex_unlock(void) | |
70 | { | |
71 | int ret; | |
72 | ||
73 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
74 | if (ret) { | |
75 | perror("Error in pthread mutex unlock"); | |
76 | exit(-1); | |
77 | } | |
78 | } | |
79 | ||
20bf310a MD |
80 | struct test_array { |
81 | int a; | |
82 | }; | |
83 | ||
84 | static struct test_array *test_rcu_pointer; | |
85 | ||
86 | #define OUTER_READ_LOOP 2000U | |
87 | #define INNER_READ_LOOP 100000U | |
88 | #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP) | |
89 | ||
102d1d23 MD |
90 | #define OUTER_WRITE_LOOP 10U |
91 | #define INNER_WRITE_LOOP 200U | |
92 | #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP) | |
20bf310a | 93 | |
2c9689fe MD |
94 | static int num_read; |
95 | static int num_write; | |
20bf310a | 96 | |
2c9689fe MD |
97 | #define NR_READ num_read |
98 | #define NR_WRITE num_write | |
99 | ||
06f22bdb DG |
100 | static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time; |
101 | static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time; | |
20bf310a MD |
102 | |
103 | void *thr_reader(void *arg) | |
104 | { | |
1430ee0b | 105 | int i, j; |
20bf310a MD |
106 | struct test_array *local_ptr; |
107 | cycles_t time1, time2; | |
108 | ||
109 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
110 | "reader", pthread_self(), (unsigned long)gettid()); | |
111 | sleep(2); | |
112 | ||
121a5d44 | 113 | rcu_register_thread(); |
20bf310a | 114 | |
06f22bdb | 115 | time1 = caa_get_cycles(); |
20bf310a MD |
116 | for (i = 0; i < OUTER_READ_LOOP; i++) { |
117 | for (j = 0; j < INNER_READ_LOOP; j++) { | |
1430ee0b | 118 | rcu_read_lock(); |
20bf310a MD |
119 | local_ptr = rcu_dereference(test_rcu_pointer); |
120 | if (local_ptr) { | |
121 | assert(local_ptr->a == 8); | |
122 | } | |
1430ee0b | 123 | rcu_read_unlock(); |
20bf310a MD |
124 | } |
125 | } | |
06f22bdb | 126 | time2 = caa_get_cycles(); |
20bf310a | 127 | |
121a5d44 | 128 | rcu_unregister_thread(); |
20bf310a MD |
129 | |
130 | reader_time[(unsigned long)arg] = time2 - time1; | |
131 | ||
132 | sleep(2); | |
133 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
134 | "reader", pthread_self(), (unsigned long)gettid()); | |
135 | return ((void*)1); | |
136 | ||
137 | } | |
138 | ||
139 | void *thr_writer(void *arg) | |
140 | { | |
102d1d23 | 141 | int i, j; |
20bf310a | 142 | struct test_array *new, *old; |
102d1d23 | 143 | cycles_t time1, time2; |
20bf310a MD |
144 | |
145 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
146 | "writer", pthread_self(), (unsigned long)gettid()); | |
147 | sleep(2); | |
148 | ||
102d1d23 | 149 | for (i = 0; i < OUTER_WRITE_LOOP; i++) { |
102d1d23 | 150 | for (j = 0; j < INNER_WRITE_LOOP; j++) { |
06f22bdb | 151 | time1 = caa_get_cycles(); |
102d1d23 MD |
152 | new = malloc(sizeof(struct test_array)); |
153 | rcu_copy_mutex_lock(); | |
154 | old = test_rcu_pointer; | |
155 | if (old) { | |
156 | assert(old->a == 8); | |
157 | } | |
158 | new->a = 8; | |
d2835e6f | 159 | old = rcu_xchg_pointer(&test_rcu_pointer, new); |
102d1d23 | 160 | rcu_copy_mutex_unlock(); |
d2835e6f | 161 | synchronize_rcu(); |
102d1d23 MD |
162 | /* can be done after unlock */ |
163 | if (old) { | |
164 | old->a = 0; | |
165 | } | |
166 | free(old); | |
06f22bdb | 167 | time2 = caa_get_cycles(); |
fc606a74 MD |
168 | writer_time[(unsigned long)arg] += time2 - time1; |
169 | usleep(1); | |
20bf310a | 170 | } |
20bf310a MD |
171 | } |
172 | ||
173 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
174 | "writer", pthread_self(), (unsigned long)gettid()); | |
175 | return ((void*)2); | |
176 | } | |
177 | ||
2c9689fe | 178 | int main(int argc, char **argv) |
20bf310a MD |
179 | { |
180 | int err; | |
2c9689fe | 181 | pthread_t *tid_reader, *tid_writer; |
20bf310a MD |
182 | void *tret; |
183 | int i; | |
102d1d23 MD |
184 | cycles_t tot_rtime = 0; |
185 | cycles_t tot_wtime = 0; | |
20bf310a | 186 | |
2c9689fe MD |
187 | if (argc < 2) { |
188 | printf("Usage : %s nr_readers nr_writers\n", argv[0]); | |
189 | exit(-1); | |
190 | } | |
191 | num_read = atoi(argv[1]); | |
192 | num_write = atoi(argv[2]); | |
193 | ||
194 | reader_time = malloc(sizeof(*reader_time) * num_read); | |
195 | writer_time = malloc(sizeof(*writer_time) * num_write); | |
196 | tid_reader = malloc(sizeof(*tid_reader) * num_read); | |
197 | tid_writer = malloc(sizeof(*tid_writer) * num_write); | |
198 | ||
20bf310a MD |
199 | printf("thread %-6s, thread id : %lx, tid %lu\n", |
200 | "main", pthread_self(), (unsigned long)gettid()); | |
201 | ||
202 | for (i = 0; i < NR_READ; i++) { | |
203 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
204 | (void *)(long)i); | |
205 | if (err != 0) | |
206 | exit(1); | |
207 | } | |
208 | for (i = 0; i < NR_WRITE; i++) { | |
102d1d23 MD |
209 | err = pthread_create(&tid_writer[i], NULL, thr_writer, |
210 | (void *)(long)i); | |
20bf310a MD |
211 | if (err != 0) |
212 | exit(1); | |
213 | } | |
214 | ||
215 | sleep(10); | |
216 | ||
217 | for (i = 0; i < NR_READ; i++) { | |
218 | err = pthread_join(tid_reader[i], &tret); | |
219 | if (err != 0) | |
220 | exit(1); | |
102d1d23 | 221 | tot_rtime += reader_time[i]; |
20bf310a MD |
222 | } |
223 | for (i = 0; i < NR_WRITE; i++) { | |
224 | err = pthread_join(tid_writer[i], &tret); | |
225 | if (err != 0) | |
226 | exit(1); | |
102d1d23 | 227 | tot_wtime += writer_time[i]; |
20bf310a MD |
228 | } |
229 | free(test_rcu_pointer); | |
230 | printf("Time per read : %g cycles\n", | |
102d1d23 MD |
231 | (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP)); |
232 | printf("Time per write : %g cycles\n", | |
233 | (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP)); | |
20bf310a | 234 | |
2c9689fe MD |
235 | free(reader_time); |
236 | free(writer_time); | |
237 | free(tid_reader); | |
238 | free(tid_writer); | |
239 | ||
20bf310a MD |
240 | return 0; |
241 | } |