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061159a0 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 | * | |
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. | |
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> | |
32 | #include <sys/syscall.h> | |
33 | ||
7685d963 MD |
34 | #include "arch.h" |
35 | ||
061159a0 MD |
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 | ||
51 | #define _LGPL_SOURCE | |
52 | #include "urcu-qsbr.h" | |
53 | ||
54 | struct test_array { | |
55 | int a; | |
56 | }; | |
57 | ||
58 | static volatile int test_go; | |
59 | ||
60 | static int wdelay; | |
61 | ||
62 | static struct test_array *test_rcu_pointer; | |
63 | ||
64 | static unsigned long duration; | |
65 | static time_t start_time; | |
66 | static unsigned long __thread duration_interval; | |
67 | #define DURATION_TEST_DELAY_WRITE 4 | |
68 | #define DURATION_TEST_DELAY_READ 100 | |
69 | ||
70 | /* | |
71 | * returns 0 if test should end. | |
72 | */ | |
73 | static int test_duration_write(void) | |
74 | { | |
75 | if (duration_interval++ >= DURATION_TEST_DELAY_WRITE) { | |
76 | duration_interval = 0; | |
77 | if (time(NULL) - start_time >= duration) | |
78 | return 0; | |
79 | } | |
80 | return 1; | |
81 | } | |
82 | ||
83 | static int test_duration_read(void) | |
84 | { | |
85 | if (duration_interval++ >= DURATION_TEST_DELAY_READ) { | |
86 | duration_interval = 0; | |
87 | if (time(NULL) - start_time >= duration) | |
88 | return 0; | |
89 | } | |
90 | return 1; | |
91 | } | |
92 | ||
93 | static unsigned long long __thread nr_writes; | |
94 | static unsigned long long __thread nr_reads; | |
95 | ||
96 | static unsigned int nr_readers; | |
97 | static unsigned int nr_writers; | |
98 | ||
99 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
100 | ||
101 | void rcu_copy_mutex_lock(void) | |
102 | { | |
103 | int ret; | |
104 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
105 | if (ret) { | |
106 | perror("Error in pthread mutex lock"); | |
107 | exit(-1); | |
108 | } | |
109 | } | |
110 | ||
111 | void rcu_copy_mutex_unlock(void) | |
112 | { | |
113 | int ret; | |
114 | ||
115 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
116 | if (ret) { | |
117 | perror("Error in pthread mutex unlock"); | |
118 | exit(-1); | |
119 | } | |
120 | } | |
121 | ||
122 | /* | |
123 | * malloc/free are reusing memory areas too quickly, which does not let us | |
124 | * test races appropriately. Use a large circular array for allocations. | |
125 | * ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail. | |
126 | */ | |
127 | #define ARRAY_SIZE (1048576 * nr_writers) | |
128 | #define ARRAY_POISON 0xDEADBEEF | |
129 | static int array_index; | |
130 | static struct test_array *test_array; | |
131 | ||
132 | static struct test_array *test_array_alloc(void) | |
133 | { | |
134 | struct test_array *ret; | |
135 | int index; | |
136 | ||
137 | rcu_copy_mutex_lock(); | |
138 | index = array_index % ARRAY_SIZE; | |
139 | assert(test_array[index].a == ARRAY_POISON || | |
140 | test_array[index].a == 0); | |
141 | ret = &test_array[index]; | |
142 | array_index++; | |
143 | if (array_index == ARRAY_SIZE) | |
144 | array_index = 0; | |
145 | rcu_copy_mutex_unlock(); | |
146 | return ret; | |
147 | } | |
148 | ||
149 | static void test_array_free(struct test_array *ptr) | |
150 | { | |
151 | if (!ptr) | |
152 | return; | |
153 | rcu_copy_mutex_lock(); | |
154 | ptr->a = ARRAY_POISON; | |
155 | rcu_copy_mutex_unlock(); | |
156 | } | |
157 | ||
158 | void *thr_reader(void *_count) | |
159 | { | |
160 | unsigned long long *count = _count; | |
161 | struct test_array *local_ptr; | |
162 | ||
163 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
164 | "reader", pthread_self(), (unsigned long)gettid()); | |
165 | ||
166 | rcu_register_thread(); | |
167 | ||
168 | while (!test_go) | |
169 | { | |
170 | } | |
7685d963 | 171 | smp_mb(); |
061159a0 MD |
172 | |
173 | for (;;) { | |
174 | _rcu_read_lock(); | |
175 | local_ptr = _rcu_dereference(test_rcu_pointer); | |
176 | debug_yield_read(); | |
177 | if (local_ptr) | |
178 | assert(local_ptr->a == 8); | |
179 | _rcu_read_unlock(); | |
180 | nr_reads++; | |
181 | if (duration_interval >= DURATION_TEST_DELAY_READ - 1) | |
182 | _rcu_quiescent_state(); | |
183 | if (!test_duration_read()) | |
184 | break; | |
185 | } | |
186 | ||
187 | rcu_unregister_thread(); | |
188 | ||
189 | *count = nr_reads; | |
190 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
191 | "reader", pthread_self(), (unsigned long)gettid()); | |
192 | return ((void*)1); | |
193 | ||
194 | } | |
195 | ||
196 | void *thr_writer(void *_count) | |
197 | { | |
198 | unsigned long long *count = _count; | |
199 | struct test_array *new, *old; | |
200 | ||
201 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
202 | "writer", pthread_self(), (unsigned long)gettid()); | |
203 | ||
204 | while (!test_go) | |
205 | { | |
206 | } | |
7685d963 | 207 | smp_mb(); |
061159a0 MD |
208 | |
209 | for (;;) { | |
210 | new = test_array_alloc(); | |
211 | rcu_copy_mutex_lock(); | |
212 | old = test_rcu_pointer; | |
213 | if (old) | |
214 | assert(old->a == 8); | |
215 | new->a = 8; | |
216 | old = _rcu_publish_content(&test_rcu_pointer, new); | |
217 | rcu_copy_mutex_unlock(); | |
218 | /* can be done after unlock */ | |
219 | if (old) | |
220 | old->a = 0; | |
221 | test_array_free(old); | |
222 | nr_writes++; | |
223 | if (!test_duration_write()) | |
224 | break; | |
225 | if (wdelay) | |
226 | usleep(wdelay); | |
227 | } | |
228 | ||
229 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
230 | "writer", pthread_self(), (unsigned long)gettid()); | |
231 | *count = nr_writes; | |
232 | return ((void*)2); | |
233 | } | |
234 | ||
235 | void show_usage(int argc, char **argv) | |
236 | { | |
237 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); | |
238 | #ifdef DEBUG_YIELD | |
239 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
240 | #endif | |
7685d963 | 241 | printf(" [-d delay] (writer period (us))"); |
061159a0 MD |
242 | printf("\n"); |
243 | } | |
244 | ||
245 | int main(int argc, char **argv) | |
246 | { | |
247 | int err; | |
248 | pthread_t *tid_reader, *tid_writer; | |
249 | void *tret; | |
250 | unsigned long long *count_reader, *count_writer; | |
251 | unsigned long long tot_reads = 0, tot_writes = 0; | |
252 | int i; | |
253 | ||
254 | if (argc < 4) { | |
255 | show_usage(argc, argv); | |
256 | return -1; | |
257 | } | |
258 | ||
259 | err = sscanf(argv[1], "%u", &nr_readers); | |
260 | if (err != 1) { | |
261 | show_usage(argc, argv); | |
262 | return -1; | |
263 | } | |
264 | ||
265 | err = sscanf(argv[2], "%u", &nr_writers); | |
266 | if (err != 1) { | |
267 | show_usage(argc, argv); | |
268 | return -1; | |
269 | } | |
270 | ||
271 | err = sscanf(argv[3], "%lu", &duration); | |
272 | if (err != 1) { | |
273 | show_usage(argc, argv); | |
274 | return -1; | |
275 | } | |
276 | ||
277 | for (i = 4; i < argc; i++) { | |
278 | if (argv[i][0] != '-') | |
279 | continue; | |
280 | switch (argv[i][1]) { | |
281 | #ifdef DEBUG_YIELD | |
282 | case 'r': | |
283 | yield_active |= YIELD_READ; | |
284 | break; | |
285 | case 'w': | |
286 | yield_active |= YIELD_WRITE; | |
287 | break; | |
288 | #endif | |
289 | case 'd': | |
290 | if (argc < i + 2) { | |
291 | show_usage(argc, argv); | |
292 | return -1; | |
293 | } | |
294 | wdelay = atoi(argv[++i]); | |
295 | break; | |
296 | } | |
297 | } | |
298 | ||
299 | printf("running test for %lu seconds, %u readers, %u writers.\n", | |
300 | duration, nr_readers, nr_writers); | |
301 | printf("Writer delay : %u us.\n", wdelay); | |
061159a0 MD |
302 | printf("thread %-6s, thread id : %lx, tid %lu\n", |
303 | "main", pthread_self(), (unsigned long)gettid()); | |
304 | ||
305 | test_array = malloc(sizeof(*test_array) * ARRAY_SIZE); | |
306 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); | |
307 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
308 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
309 | count_writer = malloc(sizeof(*count_writer) * nr_writers); | |
310 | ||
311 | for (i = 0; i < nr_readers; i++) { | |
312 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
313 | &count_reader[i]); | |
314 | if (err != 0) | |
315 | exit(1); | |
316 | } | |
317 | for (i = 0; i < nr_writers; i++) { | |
318 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
319 | &count_writer[i]); | |
320 | if (err != 0) | |
321 | exit(1); | |
322 | } | |
323 | ||
7685d963 | 324 | start_time = time(NULL); |
061159a0 | 325 | test_go = 1; |
7685d963 | 326 | smp_mb(); |
061159a0 MD |
327 | |
328 | for (i = 0; i < nr_readers; i++) { | |
329 | err = pthread_join(tid_reader[i], &tret); | |
330 | if (err != 0) | |
331 | exit(1); | |
332 | tot_reads += count_reader[i]; | |
333 | } | |
334 | for (i = 0; i < nr_writers; i++) { | |
335 | err = pthread_join(tid_writer[i], &tret); | |
336 | if (err != 0) | |
337 | exit(1); | |
338 | tot_writes += count_writer[i]; | |
339 | } | |
340 | ||
341 | printf("total number of reads : %llu, writes %llu\n", tot_reads, | |
342 | tot_writes); | |
343 | test_array_free(test_rcu_pointer); | |
344 | free(test_array); | |
345 | free(tid_reader); | |
346 | free(tid_writer); | |
347 | free(count_reader); | |
348 | free(count_writer); | |
349 | return 0; | |
350 | } |