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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 | ||
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 | ||
10c48e14 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 | #ifndef DYNAMIC_LINK_TEST | |
52 | #define _LGPL_SOURCE | |
53 | #else | |
54 | #define debug_yield_read() | |
55 | #endif | |
56 | #include "urcu.h" | |
57 | ||
58 | struct test_array { | |
59 | int a; | |
60 | }; | |
61 | ||
62 | pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER; | |
63 | ||
78efb485 | 64 | static volatile int test_go, test_stop; |
10c48e14 MD |
65 | |
66 | static int wdelay; | |
67 | ||
68 | static struct test_array test_array = { 8 }; | |
69 | ||
70 | static unsigned long duration; | |
10c48e14 MD |
71 | |
72 | /* | |
73 | * returns 0 if test should end. | |
74 | */ | |
75 | static int test_duration_write(void) | |
76 | { | |
78efb485 | 77 | return !test_stop; |
10c48e14 MD |
78 | } |
79 | ||
80 | static int test_duration_read(void) | |
81 | { | |
78efb485 | 82 | return !test_stop; |
10c48e14 MD |
83 | } |
84 | ||
85 | static unsigned long long __thread nr_writes; | |
86 | static unsigned long long __thread nr_reads; | |
87 | ||
88 | static unsigned int nr_readers; | |
89 | static unsigned int nr_writers; | |
90 | ||
91 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
92 | ||
93 | void rcu_copy_mutex_lock(void) | |
94 | { | |
95 | int ret; | |
96 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
97 | if (ret) { | |
98 | perror("Error in pthread mutex lock"); | |
99 | exit(-1); | |
100 | } | |
101 | } | |
102 | ||
103 | void rcu_copy_mutex_unlock(void) | |
104 | { | |
105 | int ret; | |
106 | ||
107 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
108 | if (ret) { | |
109 | perror("Error in pthread mutex unlock"); | |
110 | exit(-1); | |
111 | } | |
112 | } | |
113 | ||
114 | void *thr_reader(void *_count) | |
115 | { | |
116 | unsigned long long *count = _count; | |
117 | ||
118 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
119 | "reader", pthread_self(), (unsigned long)gettid()); | |
120 | ||
121 | while (!test_go) | |
122 | { | |
123 | } | |
124 | ||
125 | for (;;) { | |
126 | pthread_rwlock_rdlock(&lock); | |
127 | assert(test_array.a == 8); | |
128 | pthread_rwlock_unlock(&lock); | |
129 | nr_reads++; | |
130 | if (!test_duration_read()) | |
131 | break; | |
132 | } | |
133 | ||
134 | *count = nr_reads; | |
135 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
136 | "reader", pthread_self(), (unsigned long)gettid()); | |
137 | return ((void*)1); | |
138 | ||
139 | } | |
140 | ||
141 | void *thr_writer(void *_count) | |
142 | { | |
143 | unsigned long long *count = _count; | |
144 | ||
145 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
146 | "writer", pthread_self(), (unsigned long)gettid()); | |
147 | ||
148 | while (!test_go) | |
149 | { | |
150 | } | |
7685d963 | 151 | smp_mb(); |
10c48e14 MD |
152 | |
153 | for (;;) { | |
154 | pthread_rwlock_wrlock(&lock); | |
155 | test_array.a = 8; | |
156 | pthread_rwlock_unlock(&lock); | |
157 | nr_writes++; | |
158 | if (!test_duration_write()) | |
159 | break; | |
160 | if (wdelay) | |
161 | usleep(wdelay); | |
162 | } | |
163 | ||
164 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
165 | "writer", pthread_self(), (unsigned long)gettid()); | |
166 | *count = nr_writes; | |
167 | return ((void*)2); | |
168 | } | |
169 | ||
170 | void show_usage(int argc, char **argv) | |
171 | { | |
172 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); | |
173 | #ifdef DEBUG_YIELD | |
174 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
175 | #endif | |
7685d963 | 176 | printf(" [-d delay] (writer period (us))"); |
10c48e14 MD |
177 | printf("\n"); |
178 | } | |
179 | ||
180 | int main(int argc, char **argv) | |
181 | { | |
182 | int err; | |
183 | pthread_t *tid_reader, *tid_writer; | |
184 | void *tret; | |
185 | unsigned long long *count_reader, *count_writer; | |
186 | unsigned long long tot_reads = 0, tot_writes = 0; | |
187 | int i; | |
188 | ||
189 | if (argc < 4) { | |
190 | show_usage(argc, argv); | |
191 | return -1; | |
192 | } | |
7685d963 | 193 | smp_mb(); |
10c48e14 MD |
194 | |
195 | err = sscanf(argv[1], "%u", &nr_readers); | |
196 | if (err != 1) { | |
197 | show_usage(argc, argv); | |
198 | return -1; | |
199 | } | |
200 | ||
201 | err = sscanf(argv[2], "%u", &nr_writers); | |
202 | if (err != 1) { | |
203 | show_usage(argc, argv); | |
204 | return -1; | |
205 | } | |
206 | ||
207 | err = sscanf(argv[3], "%lu", &duration); | |
208 | if (err != 1) { | |
209 | show_usage(argc, argv); | |
210 | return -1; | |
211 | } | |
212 | ||
213 | for (i = 4; i < argc; i++) { | |
214 | if (argv[i][0] != '-') | |
215 | continue; | |
216 | switch (argv[i][1]) { | |
217 | #ifdef DEBUG_YIELD | |
218 | case 'r': | |
219 | yield_active |= YIELD_READ; | |
220 | break; | |
221 | case 'w': | |
222 | yield_active |= YIELD_WRITE; | |
223 | break; | |
224 | #endif | |
225 | case 'd': | |
226 | if (argc < i + 2) { | |
227 | show_usage(argc, argv); | |
228 | return -1; | |
229 | } | |
230 | wdelay = atoi(argv[++i]); | |
231 | break; | |
232 | } | |
233 | } | |
234 | ||
235 | printf("running test for %lu seconds, %u readers, %u writers.\n", | |
236 | duration, nr_readers, nr_writers); | |
237 | printf("Writer delay : %u us.\n", wdelay); | |
10c48e14 MD |
238 | printf("thread %-6s, thread id : %lx, tid %lu\n", |
239 | "main", pthread_self(), (unsigned long)gettid()); | |
240 | ||
241 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); | |
242 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
243 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
244 | count_writer = malloc(sizeof(*count_writer) * nr_writers); | |
245 | ||
246 | for (i = 0; i < nr_readers; i++) { | |
247 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
248 | &count_reader[i]); | |
249 | if (err != 0) | |
250 | exit(1); | |
251 | } | |
252 | for (i = 0; i < nr_writers; i++) { | |
253 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
254 | &count_writer[i]); | |
255 | if (err != 0) | |
256 | exit(1); | |
257 | } | |
258 | ||
7685d963 | 259 | smp_mb(); |
10c48e14 | 260 | |
78efb485 MD |
261 | test_go = 1; |
262 | ||
263 | sleep(duration); | |
264 | ||
265 | test_stop = 1; | |
266 | ||
10c48e14 MD |
267 | for (i = 0; i < nr_readers; i++) { |
268 | err = pthread_join(tid_reader[i], &tret); | |
269 | if (err != 0) | |
270 | exit(1); | |
271 | tot_reads += count_reader[i]; | |
272 | } | |
273 | for (i = 0; i < nr_writers; i++) { | |
274 | err = pthread_join(tid_writer[i], &tret); | |
275 | if (err != 0) | |
276 | exit(1); | |
277 | tot_writes += count_writer[i]; | |
278 | } | |
279 | ||
280 | printf("total number of reads : %llu, writes %llu\n", tot_reads, | |
281 | tot_writes); | |
282 | free(tid_reader); | |
283 | free(tid_writer); | |
284 | free(count_reader); | |
285 | free(count_writer); | |
286 | return 0; | |
287 | } |