Commit | Line | Data |
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b257a10b 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. | |
b257a10b MD |
21 | */ |
22 | ||
ac260fd9 | 23 | #include <stdio.h> |
f69f195a MD |
24 | #include <pthread.h> |
25 | #include <stdlib.h> | |
41718ff9 | 26 | #include <string.h> |
f69f195a MD |
27 | #include <sys/types.h> |
28 | #include <sys/wait.h> | |
29 | #include <unistd.h> | |
30 | #include <stdio.h> | |
41718ff9 | 31 | #include <assert.h> |
87bd15cd BW |
32 | #include <sys/syscall.h> |
33 | ||
7685d963 MD |
34 | #include "arch.h" |
35 | ||
87bd15cd BW |
36 | #if defined(_syscall0) |
37 | _syscall0(pid_t, gettid) | |
38 | #elif defined(__NR_gettid) | |
39 | static inline pid_t gettid(void) | |
40 | { | |
41 | return syscall(__NR_gettid); | |
42 | } | |
43 | #else | |
44 | #warning "use pid as tid" | |
45 | static inline pid_t gettid(void) | |
46 | { | |
47 | return getpid(); | |
48 | } | |
49 | #endif | |
50 | ||
121a5d44 MD |
51 | #ifndef DYNAMIC_LINK_TEST |
52 | #define _LGPL_SOURCE | |
53 | #else | |
54 | #define debug_yield_read() | |
55 | #endif | |
ac260fd9 MD |
56 | #include "urcu.h" |
57 | ||
41718ff9 MD |
58 | struct test_array { |
59 | int a; | |
41718ff9 MD |
60 | }; |
61 | ||
8c86b9a1 MD |
62 | static volatile int test_go; |
63 | ||
64 | static int wdelay; | |
bb488185 | 65 | |
41718ff9 MD |
66 | static struct test_array *test_rcu_pointer; |
67 | ||
cf380c2f MD |
68 | static unsigned long duration; |
69 | static time_t start_time; | |
70 | static unsigned long __thread duration_interval; | |
5873cd17 MD |
71 | #define DURATION_TEST_DELAY_WRITE 4 |
72 | #define DURATION_TEST_DELAY_READ 100 | |
cf380c2f MD |
73 | |
74 | /* | |
75 | * returns 0 if test should end. | |
76 | */ | |
5873cd17 | 77 | static int test_duration_write(void) |
cf380c2f | 78 | { |
5873cd17 MD |
79 | if (duration_interval++ >= DURATION_TEST_DELAY_WRITE) { |
80 | duration_interval = 0; | |
81 | if (time(NULL) - start_time >= duration) | |
82 | return 0; | |
83 | } | |
84 | return 1; | |
85 | } | |
86 | ||
87 | static int test_duration_read(void) | |
88 | { | |
89 | if (duration_interval++ >= DURATION_TEST_DELAY_READ) { | |
cf380c2f MD |
90 | duration_interval = 0; |
91 | if (time(NULL) - start_time >= duration) | |
92 | return 0; | |
93 | } | |
94 | return 1; | |
95 | } | |
96 | ||
1eec319e MD |
97 | static unsigned long long __thread nr_writes; |
98 | static unsigned long long __thread nr_reads; | |
99 | ||
8c86b9a1 MD |
100 | static unsigned int nr_readers; |
101 | static unsigned int nr_writers; | |
102 | ||
c265818b MD |
103 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; |
104 | ||
105 | void rcu_copy_mutex_lock(void) | |
106 | { | |
107 | int ret; | |
108 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
109 | if (ret) { | |
110 | perror("Error in pthread mutex lock"); | |
111 | exit(-1); | |
112 | } | |
113 | } | |
114 | ||
115 | void rcu_copy_mutex_unlock(void) | |
116 | { | |
117 | int ret; | |
118 | ||
119 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
120 | if (ret) { | |
121 | perror("Error in pthread mutex unlock"); | |
122 | exit(-1); | |
123 | } | |
124 | } | |
f69f195a | 125 | |
bb488185 MD |
126 | /* |
127 | * malloc/free are reusing memory areas too quickly, which does not let us | |
128 | * test races appropriately. Use a large circular array for allocations. | |
8c86b9a1 | 129 | * ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail. |
bb488185 | 130 | */ |
8c86b9a1 | 131 | #define ARRAY_SIZE (1048576 * nr_writers) |
bb488185 MD |
132 | #define ARRAY_POISON 0xDEADBEEF |
133 | static int array_index; | |
8c86b9a1 | 134 | static struct test_array *test_array; |
bb488185 MD |
135 | |
136 | static struct test_array *test_array_alloc(void) | |
137 | { | |
138 | struct test_array *ret; | |
139 | int index; | |
140 | ||
141 | rcu_copy_mutex_lock(); | |
142 | index = array_index % ARRAY_SIZE; | |
143 | assert(test_array[index].a == ARRAY_POISON || | |
144 | test_array[index].a == 0); | |
145 | ret = &test_array[index]; | |
146 | array_index++; | |
147 | if (array_index == ARRAY_SIZE) | |
148 | array_index = 0; | |
149 | rcu_copy_mutex_unlock(); | |
150 | return ret; | |
151 | } | |
152 | ||
153 | static void test_array_free(struct test_array *ptr) | |
154 | { | |
155 | if (!ptr) | |
156 | return; | |
157 | rcu_copy_mutex_lock(); | |
158 | ptr->a = ARRAY_POISON; | |
159 | rcu_copy_mutex_unlock(); | |
160 | } | |
161 | ||
1eec319e | 162 | void *thr_reader(void *_count) |
f69f195a | 163 | { |
1eec319e | 164 | unsigned long long *count = _count; |
41718ff9 MD |
165 | struct test_array *local_ptr; |
166 | ||
cf380c2f | 167 | printf("thread_begin %s, thread id : %lx, tid %lu\n", |
87bd15cd | 168 | "reader", pthread_self(), (unsigned long)gettid()); |
f69f195a | 169 | |
121a5d44 | 170 | rcu_register_thread(); |
f69f195a | 171 | |
8c86b9a1 MD |
172 | while (!test_go) |
173 | { | |
174 | } | |
7685d963 | 175 | smp_mb(); |
8c86b9a1 | 176 | |
cf380c2f | 177 | for (;;) { |
1430ee0b | 178 | rcu_read_lock(); |
cf380c2f | 179 | local_ptr = rcu_dereference(test_rcu_pointer); |
bb488185 | 180 | debug_yield_read(); |
cf380c2f MD |
181 | if (local_ptr) |
182 | assert(local_ptr->a == 8); | |
1430ee0b | 183 | rcu_read_unlock(); |
1eec319e | 184 | nr_reads++; |
5873cd17 | 185 | if (!test_duration_read()) |
cf380c2f | 186 | break; |
41718ff9 | 187 | } |
f69f195a | 188 | |
121a5d44 | 189 | rcu_unregister_thread(); |
41718ff9 | 190 | |
1eec319e | 191 | *count = nr_reads; |
cf380c2f MD |
192 | printf("thread_end %s, thread id : %lx, tid %lu\n", |
193 | "reader", pthread_self(), (unsigned long)gettid()); | |
f69f195a MD |
194 | return ((void*)1); |
195 | ||
196 | } | |
197 | ||
1eec319e | 198 | void *thr_writer(void *_count) |
f69f195a | 199 | { |
1eec319e | 200 | unsigned long long *count = _count; |
41718ff9 | 201 | struct test_array *new, *old; |
f69f195a | 202 | |
cf380c2f | 203 | printf("thread_begin %s, thread id : %lx, tid %lu\n", |
87bd15cd | 204 | "writer", pthread_self(), (unsigned long)gettid()); |
f69f195a | 205 | |
8c86b9a1 MD |
206 | while (!test_go) |
207 | { | |
208 | } | |
7685d963 | 209 | smp_mb(); |
8c86b9a1 | 210 | |
cf380c2f | 211 | for (;;) { |
bb488185 | 212 | new = test_array_alloc(); |
c265818b | 213 | rcu_copy_mutex_lock(); |
41718ff9 | 214 | old = test_rcu_pointer; |
cf380c2f | 215 | if (old) |
41718ff9 | 216 | assert(old->a == 8); |
ad6ce6ae | 217 | new->a = 8; |
121a5d44 | 218 | old = rcu_publish_content(&test_rcu_pointer, new); |
c265818b | 219 | rcu_copy_mutex_unlock(); |
41718ff9 | 220 | /* can be done after unlock */ |
cf380c2f | 221 | if (old) |
8c8eed97 | 222 | old->a = 0; |
bb488185 | 223 | test_array_free(old); |
1eec319e | 224 | nr_writes++; |
5873cd17 | 225 | if (!test_duration_write()) |
cf380c2f | 226 | break; |
8c86b9a1 MD |
227 | if (wdelay) |
228 | usleep(wdelay); | |
f69f195a MD |
229 | } |
230 | ||
cf380c2f MD |
231 | printf("thread_end %s, thread id : %lx, tid %lu\n", |
232 | "writer", pthread_self(), (unsigned long)gettid()); | |
1eec319e | 233 | *count = nr_writes; |
f69f195a MD |
234 | return ((void*)2); |
235 | } | |
ac260fd9 | 236 | |
1430ee0b MD |
237 | void show_usage(int argc, char **argv) |
238 | { | |
8c86b9a1 | 239 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); |
1430ee0b MD |
240 | #ifdef DEBUG_YIELD |
241 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
242 | #endif | |
7685d963 | 243 | printf(" [-d delay] (writer period (us))"); |
1430ee0b MD |
244 | printf("\n"); |
245 | } | |
246 | ||
cf380c2f | 247 | int main(int argc, char **argv) |
ac260fd9 | 248 | { |
f69f195a | 249 | int err; |
8c86b9a1 | 250 | pthread_t *tid_reader, *tid_writer; |
f69f195a | 251 | void *tret; |
8c86b9a1 | 252 | unsigned long long *count_reader, *count_writer; |
1eec319e | 253 | unsigned long long tot_reads = 0, tot_writes = 0; |
f69f195a MD |
254 | int i; |
255 | ||
8c86b9a1 MD |
256 | if (argc < 4) { |
257 | show_usage(argc, argv); | |
258 | return -1; | |
259 | } | |
260 | ||
261 | err = sscanf(argv[1], "%u", &nr_readers); | |
262 | if (err != 1) { | |
1430ee0b | 263 | show_usage(argc, argv); |
cf380c2f MD |
264 | return -1; |
265 | } | |
266 | ||
8c86b9a1 MD |
267 | err = sscanf(argv[2], "%u", &nr_writers); |
268 | if (err != 1) { | |
269 | show_usage(argc, argv); | |
270 | return -1; | |
271 | } | |
272 | ||
273 | err = sscanf(argv[3], "%lu", &duration); | |
cf380c2f | 274 | if (err != 1) { |
1430ee0b | 275 | show_usage(argc, argv); |
cf380c2f MD |
276 | return -1; |
277 | } | |
278 | ||
8c86b9a1 | 279 | for (i = 4; i < argc; i++) { |
cf380c2f MD |
280 | if (argv[i][0] != '-') |
281 | continue; | |
282 | switch (argv[i][1]) { | |
bb488185 | 283 | #ifdef DEBUG_YIELD |
cf380c2f MD |
284 | case 'r': |
285 | yield_active |= YIELD_READ; | |
286 | break; | |
287 | case 'w': | |
288 | yield_active |= YIELD_WRITE; | |
289 | break; | |
bb488185 | 290 | #endif |
8c86b9a1 | 291 | case 'd': |
7685d963 | 292 | if (argc < i + 2) { |
8c86b9a1 MD |
293 | show_usage(argc, argv); |
294 | return -1; | |
295 | } | |
296 | wdelay = atoi(argv[++i]); | |
bb488185 | 297 | break; |
cf380c2f MD |
298 | } |
299 | } | |
cf380c2f | 300 | |
8c86b9a1 MD |
301 | printf("running test for %lu seconds, %u readers, %u writers.\n", |
302 | duration, nr_readers, nr_writers); | |
303 | printf("Writer delay : %u us.\n", wdelay); | |
87bd15cd BW |
304 | printf("thread %-6s, thread id : %lx, tid %lu\n", |
305 | "main", pthread_self(), (unsigned long)gettid()); | |
306 | ||
8c86b9a1 MD |
307 | test_array = malloc(sizeof(*test_array) * ARRAY_SIZE); |
308 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); | |
309 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
310 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
311 | count_writer = malloc(sizeof(*count_writer) * nr_writers); | |
312 | ||
313 | for (i = 0; i < nr_readers; i++) { | |
1eec319e MD |
314 | err = pthread_create(&tid_reader[i], NULL, thr_reader, |
315 | &count_reader[i]); | |
f69f195a MD |
316 | if (err != 0) |
317 | exit(1); | |
318 | } | |
8c86b9a1 | 319 | for (i = 0; i < nr_writers; i++) { |
1eec319e MD |
320 | err = pthread_create(&tid_writer[i], NULL, thr_writer, |
321 | &count_writer[i]); | |
f69f195a MD |
322 | if (err != 0) |
323 | exit(1); | |
324 | } | |
325 | ||
7685d963 | 326 | start_time = time(NULL); |
8c86b9a1 | 327 | test_go = 1; |
7685d963 | 328 | smp_mb(); |
8c86b9a1 MD |
329 | |
330 | for (i = 0; i < nr_readers; i++) { | |
f69f195a MD |
331 | err = pthread_join(tid_reader[i], &tret); |
332 | if (err != 0) | |
333 | exit(1); | |
1eec319e | 334 | tot_reads += count_reader[i]; |
f69f195a | 335 | } |
8c86b9a1 | 336 | for (i = 0; i < nr_writers; i++) { |
f69f195a MD |
337 | err = pthread_join(tid_writer[i], &tret); |
338 | if (err != 0) | |
339 | exit(1); | |
1eec319e | 340 | tot_writes += count_writer[i]; |
f69f195a | 341 | } |
5873cd17 | 342 | |
1eec319e MD |
343 | printf("total number of reads : %llu, writes %llu\n", tot_reads, |
344 | tot_writes); | |
bb488185 | 345 | test_array_free(test_rcu_pointer); |
8c86b9a1 MD |
346 | free(test_array); |
347 | free(tid_reader); | |
348 | free(tid_writer); | |
349 | free(count_reader); | |
350 | free(count_writer); | |
f69f195a | 351 | return 0; |
ac260fd9 | 352 | } |