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ce29b371 MJ |
1 | // SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
2 | // | |
3 | // SPDX-License-Identifier: GPL-2.0-or-later | |
4 | ||
20bf310a | 5 | /* |
20bf310a | 6 | * Userspace RCU library - test program |
20bf310a MD |
7 | */ |
8 | ||
9 | #include <stdio.h> | |
10 | #include <pthread.h> | |
11 | #include <stdlib.h> | |
12 | #include <string.h> | |
13 | #include <sys/types.h> | |
14 | #include <sys/wait.h> | |
15 | #include <unistd.h> | |
16 | #include <stdio.h> | |
94b343fd | 17 | #include <errno.h> |
01477510 | 18 | |
ec4e58a3 | 19 | #include <urcu/arch.h> |
01477510 | 20 | #include <urcu/assert.h> |
20bf310a | 21 | |
94df6318 | 22 | #include "thread-id.h" |
20bf310a | 23 | |
121a5d44 | 24 | #define _LGPL_SOURCE |
ec4e58a3 | 25 | #include <urcu.h> |
20bf310a | 26 | |
c265818b MD |
27 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; |
28 | ||
61c3fb60 | 29 | static |
c265818b MD |
30 | void rcu_copy_mutex_lock(void) |
31 | { | |
32 | int ret; | |
33 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
34 | if (ret) { | |
35 | perror("Error in pthread mutex lock"); | |
36 | exit(-1); | |
37 | } | |
38 | } | |
39 | ||
61c3fb60 | 40 | static |
c265818b MD |
41 | void rcu_copy_mutex_unlock(void) |
42 | { | |
43 | int ret; | |
44 | ||
45 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
46 | if (ret) { | |
47 | perror("Error in pthread mutex unlock"); | |
48 | exit(-1); | |
49 | } | |
50 | } | |
51 | ||
20bf310a MD |
52 | struct test_array { |
53 | int a; | |
54 | }; | |
55 | ||
56 | static struct test_array *test_rcu_pointer; | |
57 | ||
58 | #define OUTER_READ_LOOP 2000U | |
59 | #define INNER_READ_LOOP 100000U | |
60 | #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP) | |
61 | ||
102d1d23 MD |
62 | #define OUTER_WRITE_LOOP 10U |
63 | #define INNER_WRITE_LOOP 200U | |
64 | #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP) | |
20bf310a | 65 | |
2c9689fe MD |
66 | static int num_read; |
67 | static int num_write; | |
20bf310a | 68 | |
2c9689fe MD |
69 | #define NR_READ num_read |
70 | #define NR_WRITE num_write | |
71 | ||
3fa18286 MD |
72 | static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time; |
73 | static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time; | |
20bf310a | 74 | |
61c3fb60 | 75 | static |
20bf310a MD |
76 | void *thr_reader(void *arg) |
77 | { | |
83e334d0 | 78 | unsigned int i, j; |
20bf310a | 79 | struct test_array *local_ptr; |
3fa18286 | 80 | caa_cycles_t time1, time2; |
20bf310a | 81 | |
94df6318 MD |
82 | printf("thread_begin %s, tid %lu\n", |
83 | "reader", urcu_get_thread_id()); | |
20bf310a MD |
84 | sleep(2); |
85 | ||
121a5d44 | 86 | rcu_register_thread(); |
20bf310a | 87 | |
06f22bdb | 88 | time1 = caa_get_cycles(); |
20bf310a MD |
89 | for (i = 0; i < OUTER_READ_LOOP; i++) { |
90 | for (j = 0; j < INNER_READ_LOOP; j++) { | |
1430ee0b | 91 | rcu_read_lock(); |
20bf310a MD |
92 | local_ptr = rcu_dereference(test_rcu_pointer); |
93 | if (local_ptr) { | |
01477510 | 94 | urcu_posix_assert(local_ptr->a == 8); |
20bf310a | 95 | } |
1430ee0b | 96 | rcu_read_unlock(); |
20bf310a MD |
97 | } |
98 | } | |
06f22bdb | 99 | time2 = caa_get_cycles(); |
20bf310a | 100 | |
121a5d44 | 101 | rcu_unregister_thread(); |
20bf310a MD |
102 | |
103 | reader_time[(unsigned long)arg] = time2 - time1; | |
104 | ||
105 | sleep(2); | |
94df6318 MD |
106 | printf("thread_end %s, tid %lu\n", |
107 | "reader", urcu_get_thread_id()); | |
20bf310a MD |
108 | return ((void*)1); |
109 | ||
110 | } | |
111 | ||
61c3fb60 | 112 | static |
20bf310a MD |
113 | void *thr_writer(void *arg) |
114 | { | |
83e334d0 | 115 | unsigned int i, j; |
20bf310a | 116 | struct test_array *new, *old; |
3fa18286 | 117 | caa_cycles_t time1, time2; |
20bf310a | 118 | |
94df6318 MD |
119 | printf("thread_begin %s, tid %lu\n", |
120 | "writer", urcu_get_thread_id()); | |
20bf310a MD |
121 | sleep(2); |
122 | ||
102d1d23 | 123 | for (i = 0; i < OUTER_WRITE_LOOP; i++) { |
102d1d23 | 124 | for (j = 0; j < INNER_WRITE_LOOP; j++) { |
06f22bdb | 125 | time1 = caa_get_cycles(); |
102d1d23 MD |
126 | new = malloc(sizeof(struct test_array)); |
127 | rcu_copy_mutex_lock(); | |
128 | old = test_rcu_pointer; | |
129 | if (old) { | |
01477510 | 130 | urcu_posix_assert(old->a == 8); |
102d1d23 MD |
131 | } |
132 | new->a = 8; | |
d2835e6f | 133 | old = rcu_xchg_pointer(&test_rcu_pointer, new); |
102d1d23 | 134 | rcu_copy_mutex_unlock(); |
d2835e6f | 135 | synchronize_rcu(); |
102d1d23 MD |
136 | /* can be done after unlock */ |
137 | if (old) { | |
138 | old->a = 0; | |
139 | } | |
140 | free(old); | |
06f22bdb | 141 | time2 = caa_get_cycles(); |
fc606a74 MD |
142 | writer_time[(unsigned long)arg] += time2 - time1; |
143 | usleep(1); | |
20bf310a | 144 | } |
20bf310a MD |
145 | } |
146 | ||
94df6318 MD |
147 | printf("thread_end %s, tid %lu\n", |
148 | "writer", urcu_get_thread_id()); | |
20bf310a MD |
149 | return ((void*)2); |
150 | } | |
151 | ||
2c9689fe | 152 | int main(int argc, char **argv) |
20bf310a MD |
153 | { |
154 | int err; | |
2c9689fe | 155 | pthread_t *tid_reader, *tid_writer; |
20bf310a MD |
156 | void *tret; |
157 | int i; | |
3fa18286 MD |
158 | caa_cycles_t tot_rtime = 0; |
159 | caa_cycles_t tot_wtime = 0; | |
20bf310a | 160 | |
2c9689fe MD |
161 | if (argc < 2) { |
162 | printf("Usage : %s nr_readers nr_writers\n", argv[0]); | |
163 | exit(-1); | |
164 | } | |
165 | num_read = atoi(argv[1]); | |
166 | num_write = atoi(argv[2]); | |
167 | ||
9aa14175 MD |
168 | reader_time = calloc(num_read, sizeof(*reader_time)); |
169 | writer_time = calloc(num_write, sizeof(*writer_time)); | |
170 | tid_reader = calloc(num_read, sizeof(*tid_reader)); | |
171 | tid_writer = calloc(num_write, sizeof(*tid_writer)); | |
2c9689fe | 172 | |
94df6318 MD |
173 | printf("thread %-6s, tid %lu\n", |
174 | "main", urcu_get_thread_id()); | |
20bf310a MD |
175 | |
176 | for (i = 0; i < NR_READ; i++) { | |
177 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
178 | (void *)(long)i); | |
179 | if (err != 0) | |
180 | exit(1); | |
181 | } | |
182 | for (i = 0; i < NR_WRITE; i++) { | |
102d1d23 MD |
183 | err = pthread_create(&tid_writer[i], NULL, thr_writer, |
184 | (void *)(long)i); | |
20bf310a MD |
185 | if (err != 0) |
186 | exit(1); | |
187 | } | |
188 | ||
189 | sleep(10); | |
190 | ||
191 | for (i = 0; i < NR_READ; i++) { | |
192 | err = pthread_join(tid_reader[i], &tret); | |
193 | if (err != 0) | |
194 | exit(1); | |
102d1d23 | 195 | tot_rtime += reader_time[i]; |
20bf310a MD |
196 | } |
197 | for (i = 0; i < NR_WRITE; i++) { | |
198 | err = pthread_join(tid_writer[i], &tret); | |
199 | if (err != 0) | |
200 | exit(1); | |
102d1d23 | 201 | tot_wtime += writer_time[i]; |
20bf310a MD |
202 | } |
203 | free(test_rcu_pointer); | |
204 | printf("Time per read : %g cycles\n", | |
102d1d23 MD |
205 | (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP)); |
206 | printf("Time per write : %g cycles\n", | |
207 | (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP)); | |
20bf310a | 208 | |
2c9689fe MD |
209 | free(reader_time); |
210 | free(writer_time); | |
211 | free(tid_reader); | |
212 | free(tid_writer); | |
213 | ||
20bf310a MD |
214 | return 0; |
215 | } |