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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 | ||
78efb485 | 58 | static volatile int test_go, test_stop; |
061159a0 MD |
59 | |
60 | static int wdelay; | |
61 | ||
62 | static struct test_array *test_rcu_pointer; | |
63 | ||
64 | static unsigned long duration; | |
061159a0 MD |
65 | |
66 | /* | |
67 | * returns 0 if test should end. | |
68 | */ | |
69 | static int test_duration_write(void) | |
70 | { | |
78efb485 | 71 | return !test_stop; |
061159a0 MD |
72 | } |
73 | ||
74 | static int test_duration_read(void) | |
75 | { | |
78efb485 | 76 | return !test_stop; |
061159a0 MD |
77 | } |
78 | ||
79 | static unsigned long long __thread nr_writes; | |
80 | static unsigned long long __thread nr_reads; | |
81 | ||
82 | static unsigned int nr_readers; | |
83 | static unsigned int nr_writers; | |
84 | ||
85 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
86 | ||
87 | void rcu_copy_mutex_lock(void) | |
88 | { | |
89 | int ret; | |
90 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
91 | if (ret) { | |
92 | perror("Error in pthread mutex lock"); | |
93 | exit(-1); | |
94 | } | |
95 | } | |
96 | ||
97 | void rcu_copy_mutex_unlock(void) | |
98 | { | |
99 | int ret; | |
100 | ||
101 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
102 | if (ret) { | |
103 | perror("Error in pthread mutex unlock"); | |
104 | exit(-1); | |
105 | } | |
106 | } | |
107 | ||
108 | /* | |
109 | * malloc/free are reusing memory areas too quickly, which does not let us | |
110 | * test races appropriately. Use a large circular array for allocations. | |
111 | * ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail. | |
112 | */ | |
113 | #define ARRAY_SIZE (1048576 * nr_writers) | |
114 | #define ARRAY_POISON 0xDEADBEEF | |
115 | static int array_index; | |
116 | static struct test_array *test_array; | |
117 | ||
118 | static struct test_array *test_array_alloc(void) | |
119 | { | |
120 | struct test_array *ret; | |
121 | int index; | |
122 | ||
123 | rcu_copy_mutex_lock(); | |
124 | index = array_index % ARRAY_SIZE; | |
125 | assert(test_array[index].a == ARRAY_POISON || | |
126 | test_array[index].a == 0); | |
127 | ret = &test_array[index]; | |
128 | array_index++; | |
129 | if (array_index == ARRAY_SIZE) | |
130 | array_index = 0; | |
131 | rcu_copy_mutex_unlock(); | |
132 | return ret; | |
133 | } | |
134 | ||
135 | static void test_array_free(struct test_array *ptr) | |
136 | { | |
137 | if (!ptr) | |
138 | return; | |
139 | rcu_copy_mutex_lock(); | |
140 | ptr->a = ARRAY_POISON; | |
141 | rcu_copy_mutex_unlock(); | |
142 | } | |
143 | ||
144 | void *thr_reader(void *_count) | |
145 | { | |
146 | unsigned long long *count = _count; | |
147 | struct test_array *local_ptr; | |
148 | ||
149 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
150 | "reader", pthread_self(), (unsigned long)gettid()); | |
151 | ||
152 | rcu_register_thread(); | |
153 | ||
154 | while (!test_go) | |
155 | { | |
156 | } | |
7685d963 | 157 | smp_mb(); |
061159a0 MD |
158 | |
159 | for (;;) { | |
160 | _rcu_read_lock(); | |
161 | local_ptr = _rcu_dereference(test_rcu_pointer); | |
162 | debug_yield_read(); | |
163 | if (local_ptr) | |
164 | assert(local_ptr->a == 8); | |
165 | _rcu_read_unlock(); | |
166 | nr_reads++; | |
78efb485 | 167 | /* QS each 1024 reads */ |
59d5a406 | 168 | if (unlikely((nr_reads & ((1 << 10) - 1)) == 0)) |
061159a0 | 169 | _rcu_quiescent_state(); |
59d5a406 | 170 | if (unlikely(!test_duration_read())) |
061159a0 MD |
171 | break; |
172 | } | |
173 | ||
174 | rcu_unregister_thread(); | |
175 | ||
176 | *count = nr_reads; | |
177 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
178 | "reader", pthread_self(), (unsigned long)gettid()); | |
179 | return ((void*)1); | |
180 | ||
181 | } | |
182 | ||
183 | void *thr_writer(void *_count) | |
184 | { | |
185 | unsigned long long *count = _count; | |
186 | struct test_array *new, *old; | |
187 | ||
188 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
189 | "writer", pthread_self(), (unsigned long)gettid()); | |
190 | ||
191 | while (!test_go) | |
192 | { | |
193 | } | |
7685d963 | 194 | smp_mb(); |
061159a0 MD |
195 | |
196 | for (;;) { | |
197 | new = test_array_alloc(); | |
198 | rcu_copy_mutex_lock(); | |
199 | old = test_rcu_pointer; | |
200 | if (old) | |
201 | assert(old->a == 8); | |
202 | new->a = 8; | |
203 | old = _rcu_publish_content(&test_rcu_pointer, new); | |
204 | rcu_copy_mutex_unlock(); | |
205 | /* can be done after unlock */ | |
206 | if (old) | |
207 | old->a = 0; | |
208 | test_array_free(old); | |
209 | nr_writes++; | |
59d5a406 | 210 | if (unlikely(!test_duration_write())) |
061159a0 | 211 | break; |
59d5a406 | 212 | if (unlikely(wdelay)) |
061159a0 MD |
213 | usleep(wdelay); |
214 | } | |
215 | ||
216 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
217 | "writer", pthread_self(), (unsigned long)gettid()); | |
218 | *count = nr_writes; | |
219 | return ((void*)2); | |
220 | } | |
221 | ||
222 | void show_usage(int argc, char **argv) | |
223 | { | |
224 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); | |
225 | #ifdef DEBUG_YIELD | |
226 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
227 | #endif | |
7685d963 | 228 | printf(" [-d delay] (writer period (us))"); |
061159a0 MD |
229 | printf("\n"); |
230 | } | |
231 | ||
232 | int main(int argc, char **argv) | |
233 | { | |
234 | int err; | |
235 | pthread_t *tid_reader, *tid_writer; | |
236 | void *tret; | |
237 | unsigned long long *count_reader, *count_writer; | |
238 | unsigned long long tot_reads = 0, tot_writes = 0; | |
239 | int i; | |
240 | ||
241 | if (argc < 4) { | |
242 | show_usage(argc, argv); | |
243 | return -1; | |
244 | } | |
245 | ||
246 | err = sscanf(argv[1], "%u", &nr_readers); | |
247 | if (err != 1) { | |
248 | show_usage(argc, argv); | |
249 | return -1; | |
250 | } | |
251 | ||
252 | err = sscanf(argv[2], "%u", &nr_writers); | |
253 | if (err != 1) { | |
254 | show_usage(argc, argv); | |
255 | return -1; | |
256 | } | |
257 | ||
258 | err = sscanf(argv[3], "%lu", &duration); | |
259 | if (err != 1) { | |
260 | show_usage(argc, argv); | |
261 | return -1; | |
262 | } | |
263 | ||
264 | for (i = 4; i < argc; i++) { | |
265 | if (argv[i][0] != '-') | |
266 | continue; | |
267 | switch (argv[i][1]) { | |
268 | #ifdef DEBUG_YIELD | |
269 | case 'r': | |
270 | yield_active |= YIELD_READ; | |
271 | break; | |
272 | case 'w': | |
273 | yield_active |= YIELD_WRITE; | |
274 | break; | |
275 | #endif | |
276 | case 'd': | |
277 | if (argc < i + 2) { | |
278 | show_usage(argc, argv); | |
279 | return -1; | |
280 | } | |
281 | wdelay = atoi(argv[++i]); | |
282 | break; | |
283 | } | |
284 | } | |
285 | ||
286 | printf("running test for %lu seconds, %u readers, %u writers.\n", | |
287 | duration, nr_readers, nr_writers); | |
288 | printf("Writer delay : %u us.\n", wdelay); | |
061159a0 MD |
289 | printf("thread %-6s, thread id : %lx, tid %lu\n", |
290 | "main", pthread_self(), (unsigned long)gettid()); | |
291 | ||
292 | test_array = malloc(sizeof(*test_array) * ARRAY_SIZE); | |
293 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); | |
294 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
295 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
296 | count_writer = malloc(sizeof(*count_writer) * nr_writers); | |
297 | ||
298 | for (i = 0; i < nr_readers; i++) { | |
299 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
300 | &count_reader[i]); | |
301 | if (err != 0) | |
302 | exit(1); | |
303 | } | |
304 | for (i = 0; i < nr_writers; i++) { | |
305 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
306 | &count_writer[i]); | |
307 | if (err != 0) | |
308 | exit(1); | |
309 | } | |
310 | ||
7685d963 | 311 | smp_mb(); |
061159a0 | 312 | |
78efb485 MD |
313 | test_go = 1; |
314 | ||
315 | sleep(duration); | |
316 | ||
317 | test_stop = 1; | |
318 | ||
061159a0 MD |
319 | for (i = 0; i < nr_readers; i++) { |
320 | err = pthread_join(tid_reader[i], &tret); | |
321 | if (err != 0) | |
322 | exit(1); | |
323 | tot_reads += count_reader[i]; | |
324 | } | |
325 | for (i = 0; i < nr_writers; i++) { | |
326 | err = pthread_join(tid_writer[i], &tret); | |
327 | if (err != 0) | |
328 | exit(1); | |
329 | tot_writes += count_writer[i]; | |
330 | } | |
331 | ||
332 | printf("total number of reads : %llu, writes %llu\n", tot_reads, | |
333 | tot_writes); | |
334 | test_array_free(test_rcu_pointer); | |
335 | free(test_array); | |
336 | free(tid_reader); | |
337 | free(tid_writer); | |
338 | free(count_reader); | |
339 | free(count_writer); | |
340 | return 0; | |
341 | } |