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10c48e14 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 | ||
9e97e478 | 23 | #define _GNU_SOURCE |
10c48e14 MD |
24 | #include <stdio.h> |
25 | #include <pthread.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <sys/types.h> | |
29 | #include <sys/wait.h> | |
30 | #include <unistd.h> | |
31 | #include <stdio.h> | |
32 | #include <assert.h> | |
33 | #include <sys/syscall.h> | |
9e97e478 | 34 | #include <sched.h> |
10c48e14 | 35 | |
7685d963 MD |
36 | #include "arch.h" |
37 | ||
10c48e14 MD |
38 | #if defined(_syscall0) |
39 | _syscall0(pid_t, gettid) | |
40 | #elif defined(__NR_gettid) | |
41 | static inline pid_t gettid(void) | |
42 | { | |
43 | return syscall(__NR_gettid); | |
44 | } | |
45 | #else | |
46 | #warning "use pid as tid" | |
47 | static inline pid_t gettid(void) | |
48 | { | |
49 | return getpid(); | |
50 | } | |
51 | #endif | |
52 | ||
53 | #ifndef DYNAMIC_LINK_TEST | |
54 | #define _LGPL_SOURCE | |
55 | #else | |
56 | #define debug_yield_read() | |
57 | #endif | |
58 | #include "urcu.h" | |
59 | ||
60 | struct test_array { | |
61 | int a; | |
62 | }; | |
63 | ||
64 | pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER; | |
65 | ||
78efb485 | 66 | static volatile int test_go, test_stop; |
10c48e14 MD |
67 | |
68 | static int wdelay; | |
69 | ||
2b4e4125 | 70 | static volatile struct test_array test_array = { 8 }; |
10c48e14 MD |
71 | |
72 | static unsigned long duration; | |
10c48e14 | 73 | |
daddf5b0 | 74 | /* read-side C.S. duration, in loops */ |
8b632bab MD |
75 | static unsigned long rduration; |
76 | ||
daddf5b0 MD |
77 | static inline void loop_sleep(unsigned long l) |
78 | { | |
79 | while(l-- != 0) | |
80 | cpu_relax(); | |
81 | } | |
82 | ||
10c48e14 MD |
83 | /* |
84 | * returns 0 if test should end. | |
85 | */ | |
86 | static int test_duration_write(void) | |
87 | { | |
78efb485 | 88 | return !test_stop; |
10c48e14 MD |
89 | } |
90 | ||
91 | static int test_duration_read(void) | |
92 | { | |
78efb485 | 93 | return !test_stop; |
10c48e14 MD |
94 | } |
95 | ||
96 | static unsigned long long __thread nr_writes; | |
97 | static unsigned long long __thread nr_reads; | |
98 | ||
99 | static unsigned int nr_readers; | |
100 | static unsigned int nr_writers; | |
101 | ||
102 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
103 | ||
104 | void rcu_copy_mutex_lock(void) | |
105 | { | |
106 | int ret; | |
107 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
108 | if (ret) { | |
109 | perror("Error in pthread mutex lock"); | |
110 | exit(-1); | |
111 | } | |
112 | } | |
113 | ||
114 | void rcu_copy_mutex_unlock(void) | |
115 | { | |
116 | int ret; | |
117 | ||
118 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
119 | if (ret) { | |
120 | perror("Error in pthread mutex unlock"); | |
121 | exit(-1); | |
122 | } | |
123 | } | |
124 | ||
125 | void *thr_reader(void *_count) | |
126 | { | |
127 | unsigned long long *count = _count; | |
128 | ||
129 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
130 | "reader", pthread_self(), (unsigned long)gettid()); | |
131 | ||
132 | while (!test_go) | |
133 | { | |
134 | } | |
135 | ||
136 | for (;;) { | |
137 | pthread_rwlock_rdlock(&lock); | |
138 | assert(test_array.a == 8); | |
8b632bab | 139 | if (unlikely(rduration)) |
daddf5b0 | 140 | loop_sleep(rduration); |
10c48e14 MD |
141 | pthread_rwlock_unlock(&lock); |
142 | nr_reads++; | |
59d5a406 | 143 | if (unlikely(!test_duration_read())) |
10c48e14 MD |
144 | break; |
145 | } | |
146 | ||
147 | *count = nr_reads; | |
148 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
149 | "reader", pthread_self(), (unsigned long)gettid()); | |
150 | return ((void*)1); | |
151 | ||
152 | } | |
153 | ||
154 | void *thr_writer(void *_count) | |
155 | { | |
156 | unsigned long long *count = _count; | |
157 | ||
158 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
159 | "writer", pthread_self(), (unsigned long)gettid()); | |
160 | ||
161 | while (!test_go) | |
162 | { | |
163 | } | |
7685d963 | 164 | smp_mb(); |
10c48e14 MD |
165 | |
166 | for (;;) { | |
167 | pthread_rwlock_wrlock(&lock); | |
2b4e4125 | 168 | test_array.a = 0; |
10c48e14 MD |
169 | test_array.a = 8; |
170 | pthread_rwlock_unlock(&lock); | |
171 | nr_writes++; | |
59d5a406 | 172 | if (unlikely(!test_duration_write())) |
10c48e14 | 173 | break; |
59d5a406 | 174 | if (unlikely(wdelay)) |
10c48e14 MD |
175 | usleep(wdelay); |
176 | } | |
177 | ||
178 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
179 | "writer", pthread_self(), (unsigned long)gettid()); | |
180 | *count = nr_writes; | |
181 | return ((void*)2); | |
182 | } | |
183 | ||
184 | void show_usage(int argc, char **argv) | |
185 | { | |
186 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); | |
187 | #ifdef DEBUG_YIELD | |
188 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
189 | #endif | |
7685d963 | 190 | printf(" [-d delay] (writer period (us))"); |
daddf5b0 | 191 | printf(" [-c duration] (reader C.S. duration (in loops))"); |
9e97e478 | 192 | printf(" [-a cpu#] [-a cpu#]... (affinity)"); |
10c48e14 MD |
193 | printf("\n"); |
194 | } | |
195 | ||
9e97e478 MD |
196 | cpu_set_t affinity; |
197 | ||
10c48e14 MD |
198 | int main(int argc, char **argv) |
199 | { | |
200 | int err; | |
201 | pthread_t *tid_reader, *tid_writer; | |
202 | void *tret; | |
203 | unsigned long long *count_reader, *count_writer; | |
204 | unsigned long long tot_reads = 0, tot_writes = 0; | |
9e97e478 MD |
205 | int i, a; |
206 | int use_affinity = 0; | |
10c48e14 MD |
207 | |
208 | if (argc < 4) { | |
209 | show_usage(argc, argv); | |
210 | return -1; | |
211 | } | |
7685d963 | 212 | smp_mb(); |
10c48e14 MD |
213 | |
214 | err = sscanf(argv[1], "%u", &nr_readers); | |
215 | if (err != 1) { | |
216 | show_usage(argc, argv); | |
217 | return -1; | |
218 | } | |
219 | ||
220 | err = sscanf(argv[2], "%u", &nr_writers); | |
221 | if (err != 1) { | |
222 | show_usage(argc, argv); | |
223 | return -1; | |
224 | } | |
225 | ||
226 | err = sscanf(argv[3], "%lu", &duration); | |
227 | if (err != 1) { | |
228 | show_usage(argc, argv); | |
229 | return -1; | |
230 | } | |
231 | ||
9e97e478 MD |
232 | CPU_ZERO(&affinity); |
233 | ||
10c48e14 MD |
234 | for (i = 4; i < argc; i++) { |
235 | if (argv[i][0] != '-') | |
236 | continue; | |
237 | switch (argv[i][1]) { | |
238 | #ifdef DEBUG_YIELD | |
239 | case 'r': | |
240 | yield_active |= YIELD_READ; | |
241 | break; | |
242 | case 'w': | |
243 | yield_active |= YIELD_WRITE; | |
244 | break; | |
245 | #endif | |
9e97e478 MD |
246 | case 'a': |
247 | if (argc < i + 2) { | |
248 | show_usage(argc, argv); | |
249 | return -1; | |
250 | } | |
251 | a = atoi(argv[++i]); | |
252 | CPU_SET(a, &affinity); | |
253 | use_affinity = 1; | |
254 | printf("Adding CPU %d affinity\n", a); | |
255 | break; | |
8b632bab MD |
256 | case 'c': |
257 | if (argc < i + 2) { | |
258 | show_usage(argc, argv); | |
259 | return -1; | |
260 | } | |
261 | rduration = atoi(argv[++i]); | |
262 | break; | |
10c48e14 MD |
263 | case 'd': |
264 | if (argc < i + 2) { | |
265 | show_usage(argc, argv); | |
266 | return -1; | |
267 | } | |
268 | wdelay = atoi(argv[++i]); | |
269 | break; | |
270 | } | |
271 | } | |
272 | ||
273 | printf("running test for %lu seconds, %u readers, %u writers.\n", | |
274 | duration, nr_readers, nr_writers); | |
275 | printf("Writer delay : %u us.\n", wdelay); | |
10c48e14 MD |
276 | printf("thread %-6s, thread id : %lx, tid %lu\n", |
277 | "main", pthread_self(), (unsigned long)gettid()); | |
9e97e478 MD |
278 | if (use_affinity |
279 | && sched_setaffinity(0, sizeof(affinity), &affinity) < 0) { | |
280 | perror("sched_setaffinity"); | |
281 | exit(-1); | |
282 | } | |
10c48e14 MD |
283 | |
284 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); | |
285 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
286 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
287 | count_writer = malloc(sizeof(*count_writer) * nr_writers); | |
288 | ||
289 | for (i = 0; i < nr_readers; i++) { | |
290 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
291 | &count_reader[i]); | |
292 | if (err != 0) | |
293 | exit(1); | |
294 | } | |
295 | for (i = 0; i < nr_writers; i++) { | |
296 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
297 | &count_writer[i]); | |
298 | if (err != 0) | |
299 | exit(1); | |
300 | } | |
301 | ||
7685d963 | 302 | smp_mb(); |
10c48e14 | 303 | |
78efb485 MD |
304 | test_go = 1; |
305 | ||
306 | sleep(duration); | |
307 | ||
308 | test_stop = 1; | |
309 | ||
10c48e14 MD |
310 | for (i = 0; i < nr_readers; i++) { |
311 | err = pthread_join(tid_reader[i], &tret); | |
312 | if (err != 0) | |
313 | exit(1); | |
314 | tot_reads += count_reader[i]; | |
315 | } | |
316 | for (i = 0; i < nr_writers; i++) { | |
317 | err = pthread_join(tid_writer[i], &tret); | |
318 | if (err != 0) | |
319 | exit(1); | |
320 | tot_writes += count_writer[i]; | |
321 | } | |
322 | ||
323 | printf("total number of reads : %llu, writes %llu\n", tot_reads, | |
324 | tot_writes); | |
325 | free(tid_reader); | |
326 | free(tid_writer); | |
327 | free(count_reader); | |
328 | free(count_writer); | |
329 | return 0; | |
330 | } |