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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 | ||
34 | #if defined(_syscall0) | |
35 | _syscall0(pid_t, gettid) | |
36 | #elif defined(__NR_gettid) | |
37 | static inline pid_t gettid(void) | |
38 | { | |
39 | return syscall(__NR_gettid); | |
40 | } | |
41 | #else | |
42 | #warning "use pid as tid" | |
43 | static inline pid_t gettid(void) | |
44 | { | |
45 | return getpid(); | |
46 | } | |
47 | #endif | |
48 | ||
49 | #ifndef DYNAMIC_LINK_TEST | |
50 | #define _LGPL_SOURCE | |
51 | #else | |
52 | #define debug_yield_read() | |
53 | #endif | |
54 | #include "urcu.h" | |
55 | ||
56 | struct test_array { | |
57 | int a; | |
58 | }; | |
59 | ||
60 | pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER; | |
61 | ||
62 | static volatile int test_go; | |
63 | ||
64 | static int wdelay; | |
65 | ||
66 | static struct test_array test_array = { 8 }; | |
67 | ||
68 | static unsigned long duration; | |
69 | static time_t start_time; | |
70 | static unsigned long __thread duration_interval; | |
71 | #define DURATION_TEST_DELAY_WRITE 4 | |
72 | #define DURATION_TEST_DELAY_READ 100 | |
73 | ||
74 | /* | |
75 | * returns 0 if test should end. | |
76 | */ | |
77 | static int test_duration_write(void) | |
78 | { | |
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) { | |
90 | duration_interval = 0; | |
91 | if (time(NULL) - start_time >= duration) | |
92 | return 0; | |
93 | } | |
94 | return 1; | |
95 | } | |
96 | ||
97 | static unsigned long long __thread nr_writes; | |
98 | static unsigned long long __thread nr_reads; | |
99 | ||
100 | static unsigned int nr_readers; | |
101 | static unsigned int nr_writers; | |
102 | ||
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 | } | |
125 | ||
126 | void *thr_reader(void *_count) | |
127 | { | |
128 | unsigned long long *count = _count; | |
129 | ||
130 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
131 | "reader", pthread_self(), (unsigned long)gettid()); | |
132 | ||
133 | while (!test_go) | |
134 | { | |
135 | } | |
136 | ||
137 | for (;;) { | |
138 | pthread_rwlock_rdlock(&lock); | |
139 | assert(test_array.a == 8); | |
140 | pthread_rwlock_unlock(&lock); | |
141 | nr_reads++; | |
142 | if (!test_duration_read()) | |
143 | break; | |
144 | } | |
145 | ||
146 | *count = nr_reads; | |
147 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
148 | "reader", pthread_self(), (unsigned long)gettid()); | |
149 | return ((void*)1); | |
150 | ||
151 | } | |
152 | ||
153 | void *thr_writer(void *_count) | |
154 | { | |
155 | unsigned long long *count = _count; | |
156 | ||
157 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
158 | "writer", pthread_self(), (unsigned long)gettid()); | |
159 | ||
160 | while (!test_go) | |
161 | { | |
162 | } | |
163 | ||
164 | for (;;) { | |
165 | pthread_rwlock_wrlock(&lock); | |
166 | test_array.a = 8; | |
167 | pthread_rwlock_unlock(&lock); | |
168 | nr_writes++; | |
169 | if (!test_duration_write()) | |
170 | break; | |
171 | if (wdelay) | |
172 | usleep(wdelay); | |
173 | } | |
174 | ||
175 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
176 | "writer", pthread_self(), (unsigned long)gettid()); | |
177 | *count = nr_writes; | |
178 | return ((void*)2); | |
179 | } | |
180 | ||
181 | void show_usage(int argc, char **argv) | |
182 | { | |
183 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); | |
184 | #ifdef DEBUG_YIELD | |
185 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
186 | #endif | |
187 | printf(" [-d delay] (writer period)"); | |
188 | printf("\n"); | |
189 | } | |
190 | ||
191 | int main(int argc, char **argv) | |
192 | { | |
193 | int err; | |
194 | pthread_t *tid_reader, *tid_writer; | |
195 | void *tret; | |
196 | unsigned long long *count_reader, *count_writer; | |
197 | unsigned long long tot_reads = 0, tot_writes = 0; | |
198 | int i; | |
199 | ||
200 | if (argc < 4) { | |
201 | show_usage(argc, argv); | |
202 | return -1; | |
203 | } | |
204 | ||
205 | err = sscanf(argv[1], "%u", &nr_readers); | |
206 | if (err != 1) { | |
207 | show_usage(argc, argv); | |
208 | return -1; | |
209 | } | |
210 | ||
211 | err = sscanf(argv[2], "%u", &nr_writers); | |
212 | if (err != 1) { | |
213 | show_usage(argc, argv); | |
214 | return -1; | |
215 | } | |
216 | ||
217 | err = sscanf(argv[3], "%lu", &duration); | |
218 | if (err != 1) { | |
219 | show_usage(argc, argv); | |
220 | return -1; | |
221 | } | |
222 | ||
223 | for (i = 4; i < argc; i++) { | |
224 | if (argv[i][0] != '-') | |
225 | continue; | |
226 | switch (argv[i][1]) { | |
227 | #ifdef DEBUG_YIELD | |
228 | case 'r': | |
229 | yield_active |= YIELD_READ; | |
230 | break; | |
231 | case 'w': | |
232 | yield_active |= YIELD_WRITE; | |
233 | break; | |
234 | #endif | |
235 | case 'd': | |
236 | if (argc < i + 2) { | |
237 | show_usage(argc, argv); | |
238 | return -1; | |
239 | } | |
240 | wdelay = atoi(argv[++i]); | |
241 | break; | |
242 | } | |
243 | } | |
244 | ||
245 | printf("running test for %lu seconds, %u readers, %u writers.\n", | |
246 | duration, nr_readers, nr_writers); | |
247 | printf("Writer delay : %u us.\n", wdelay); | |
248 | start_time = time(NULL); | |
249 | printf("thread %-6s, thread id : %lx, tid %lu\n", | |
250 | "main", pthread_self(), (unsigned long)gettid()); | |
251 | ||
252 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); | |
253 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
254 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
255 | count_writer = malloc(sizeof(*count_writer) * nr_writers); | |
256 | ||
257 | for (i = 0; i < nr_readers; i++) { | |
258 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
259 | &count_reader[i]); | |
260 | if (err != 0) | |
261 | exit(1); | |
262 | } | |
263 | for (i = 0; i < nr_writers; i++) { | |
264 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
265 | &count_writer[i]); | |
266 | if (err != 0) | |
267 | exit(1); | |
268 | } | |
269 | ||
270 | test_go = 1; | |
271 | ||
272 | for (i = 0; i < nr_readers; i++) { | |
273 | err = pthread_join(tid_reader[i], &tret); | |
274 | if (err != 0) | |
275 | exit(1); | |
276 | tot_reads += count_reader[i]; | |
277 | } | |
278 | for (i = 0; i < nr_writers; i++) { | |
279 | err = pthread_join(tid_writer[i], &tret); | |
280 | if (err != 0) | |
281 | exit(1); | |
282 | tot_writes += count_writer[i]; | |
283 | } | |
284 | ||
285 | printf("total number of reads : %llu, writes %llu\n", tot_reads, | |
286 | tot_writes); | |
287 | free(tid_reader); | |
288 | free(tid_writer); | |
289 | free(count_reader); | |
290 | free(count_writer); | |
291 | return 0; | |
292 | } |