Fix tests: use of uninitialized variables
[urcu.git] / tests / test_rwlock.c
1 /*
2 * test_urcu.c
3 *
4 * Userspace RCU library - test program
5 *
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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 #define _GNU_SOURCE
24 #include "../config.h"
25 #include <stdio.h>
26 #include <pthread.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <sys/types.h>
30 #include <sys/wait.h>
31 #include <unistd.h>
32 #include <stdio.h>
33 #include <assert.h>
34 #include <errno.h>
35
36 #include <urcu/arch.h>
37 #include <urcu/tls-compat.h>
38 #include "cpuset.h"
39 #include "thread-id.h"
40
41 /* hardcoded number of CPUs */
42 #define NR_CPUS 16384
43
44 #ifndef DYNAMIC_LINK_TEST
45 #define _LGPL_SOURCE
46 #else
47 #define debug_yield_read()
48 #endif
49 #include <urcu.h>
50
51 struct test_array {
52 int a;
53 };
54
55 pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;
56
57 static volatile int test_go, test_stop;
58
59 static unsigned long wdelay;
60
61 static volatile struct test_array test_array = { 8 };
62
63 static unsigned long duration;
64
65 /* read-side C.S. duration, in loops */
66 static unsigned long rduration;
67
68 /* write-side C.S. duration, in loops */
69 static unsigned long wduration;
70
71 static inline void loop_sleep(unsigned long loops)
72 {
73 while (loops-- != 0)
74 caa_cpu_relax();
75 }
76
77 static int verbose_mode;
78
79 #define printf_verbose(fmt, args...) \
80 do { \
81 if (verbose_mode) \
82 printf(fmt, args); \
83 } while (0)
84
85 static unsigned int cpu_affinities[NR_CPUS];
86 static unsigned int next_aff = 0;
87 static int use_affinity = 0;
88
89 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
90
91 static void set_affinity(void)
92 {
93 #if HAVE_SCHED_SETAFFINITY
94 cpu_set_t mask;
95 int cpu, ret;
96 #endif /* HAVE_SCHED_SETAFFINITY */
97
98 if (!use_affinity)
99 return;
100
101 #if HAVE_SCHED_SETAFFINITY
102 ret = pthread_mutex_lock(&affinity_mutex);
103 if (ret) {
104 perror("Error in pthread mutex lock");
105 exit(-1);
106 }
107 cpu = cpu_affinities[next_aff++];
108 ret = pthread_mutex_unlock(&affinity_mutex);
109 if (ret) {
110 perror("Error in pthread mutex unlock");
111 exit(-1);
112 }
113
114 CPU_ZERO(&mask);
115 CPU_SET(cpu, &mask);
116 #if SCHED_SETAFFINITY_ARGS == 2
117 sched_setaffinity(0, &mask);
118 #else
119 sched_setaffinity(0, sizeof(mask), &mask);
120 #endif
121 #endif /* HAVE_SCHED_SETAFFINITY */
122 }
123
124 /*
125 * returns 0 if test should end.
126 */
127 static int test_duration_write(void)
128 {
129 return !test_stop;
130 }
131
132 static int test_duration_read(void)
133 {
134 return !test_stop;
135 }
136
137 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
138 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
139
140 static unsigned int nr_readers;
141 static unsigned int nr_writers;
142
143 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
144
145 void rcu_copy_mutex_lock(void)
146 {
147 int ret;
148 ret = pthread_mutex_lock(&rcu_copy_mutex);
149 if (ret) {
150 perror("Error in pthread mutex lock");
151 exit(-1);
152 }
153 }
154
155 void rcu_copy_mutex_unlock(void)
156 {
157 int ret;
158
159 ret = pthread_mutex_unlock(&rcu_copy_mutex);
160 if (ret) {
161 perror("Error in pthread mutex unlock");
162 exit(-1);
163 }
164 }
165
166 void *thr_reader(void *_count)
167 {
168 unsigned long long *count = _count;
169
170 printf_verbose("thread_begin %s, tid %lu\n",
171 "reader", urcu_get_thread_id());
172
173 set_affinity();
174
175 while (!test_go)
176 {
177 }
178
179 for (;;) {
180 pthread_rwlock_rdlock(&lock);
181 assert(test_array.a == 8);
182 if (caa_unlikely(rduration))
183 loop_sleep(rduration);
184 pthread_rwlock_unlock(&lock);
185 URCU_TLS(nr_reads)++;
186 if (caa_unlikely(!test_duration_read()))
187 break;
188 }
189
190 *count = URCU_TLS(nr_reads);
191 printf_verbose("thread_end %s, tid %lu\n",
192 "reader", urcu_get_thread_id());
193 return ((void*)1);
194
195 }
196
197 void *thr_writer(void *_count)
198 {
199 unsigned long long *count = _count;
200
201 printf_verbose("thread_begin %s, tid %lu\n",
202 "writer", urcu_get_thread_id());
203
204 set_affinity();
205
206 while (!test_go)
207 {
208 }
209 cmm_smp_mb();
210
211 for (;;) {
212 pthread_rwlock_wrlock(&lock);
213 test_array.a = 0;
214 test_array.a = 8;
215 if (caa_unlikely(wduration))
216 loop_sleep(wduration);
217 pthread_rwlock_unlock(&lock);
218 URCU_TLS(nr_writes)++;
219 if (caa_unlikely(!test_duration_write()))
220 break;
221 if (caa_unlikely(wdelay))
222 loop_sleep(wdelay);
223 }
224
225 printf_verbose("thread_end %s, tid %lu\n",
226 "writer", urcu_get_thread_id());
227 *count = URCU_TLS(nr_writes);
228 return ((void*)2);
229 }
230
231 void show_usage(int argc, char **argv)
232 {
233 printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
234 argv[0]);
235 printf("OPTIONS:\n");
236 #ifdef DEBUG_YIELD
237 printf(" [-r] [-w] (yield reader and/or writer)\n");
238 #endif
239 printf(" [-d delay] (writer period (us))\n");
240 printf(" [-c duration] (reader C.S. duration (in loops))\n");
241 printf(" [-e duration] (writer C.S. duration (in loops))\n");
242 printf(" [-v] (verbose output)\n");
243 printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
244 printf("\n");
245 }
246
247 int main(int argc, char **argv)
248 {
249 int err;
250 pthread_t *tid_reader, *tid_writer;
251 void *tret;
252 unsigned long long *count_reader, *count_writer;
253 unsigned long long tot_reads = 0, tot_writes = 0;
254 int i, a;
255
256 if (argc < 4) {
257 show_usage(argc, argv);
258 return -1;
259 }
260 cmm_smp_mb();
261
262 err = sscanf(argv[1], "%u", &nr_readers);
263 if (err != 1) {
264 show_usage(argc, argv);
265 return -1;
266 }
267
268 err = sscanf(argv[2], "%u", &nr_writers);
269 if (err != 1) {
270 show_usage(argc, argv);
271 return -1;
272 }
273
274 err = sscanf(argv[3], "%lu", &duration);
275 if (err != 1) {
276 show_usage(argc, argv);
277 return -1;
278 }
279
280 for (i = 4; i < argc; i++) {
281 if (argv[i][0] != '-')
282 continue;
283 switch (argv[i][1]) {
284 #ifdef DEBUG_YIELD
285 case 'r':
286 yield_active |= YIELD_READ;
287 break;
288 case 'w':
289 yield_active |= YIELD_WRITE;
290 break;
291 #endif
292 case 'a':
293 if (argc < i + 2) {
294 show_usage(argc, argv);
295 return -1;
296 }
297 a = atoi(argv[++i]);
298 cpu_affinities[next_aff++] = a;
299 use_affinity = 1;
300 printf_verbose("Adding CPU %d affinity\n", a);
301 break;
302 case 'c':
303 if (argc < i + 2) {
304 show_usage(argc, argv);
305 return -1;
306 }
307 rduration = atol(argv[++i]);
308 break;
309 case 'd':
310 if (argc < i + 2) {
311 show_usage(argc, argv);
312 return -1;
313 }
314 wdelay = atol(argv[++i]);
315 break;
316 case 'e':
317 if (argc < i + 2) {
318 show_usage(argc, argv);
319 return -1;
320 }
321 wduration = atol(argv[++i]);
322 break;
323 case 'v':
324 verbose_mode = 1;
325 break;
326 }
327 }
328
329 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
330 duration, nr_readers, nr_writers);
331 printf_verbose("Writer delay : %lu loops.\n", wdelay);
332 printf_verbose("Reader duration : %lu loops.\n", rduration);
333 printf_verbose("thread %-6s, tid %lu\n",
334 "main", urcu_get_thread_id());
335
336 tid_reader = calloc(nr_readers, sizeof(*tid_reader));
337 tid_writer = calloc(nr_writers, sizeof(*tid_writer));
338 count_reader = calloc(nr_readers, sizeof(*count_reader));
339 count_writer = calloc(nr_writers, sizeof(*count_writer));
340
341 next_aff = 0;
342
343 for (i = 0; i < nr_readers; i++) {
344 err = pthread_create(&tid_reader[i], NULL, thr_reader,
345 &count_reader[i]);
346 if (err != 0)
347 exit(1);
348 }
349 for (i = 0; i < nr_writers; i++) {
350 err = pthread_create(&tid_writer[i], NULL, thr_writer,
351 &count_writer[i]);
352 if (err != 0)
353 exit(1);
354 }
355
356 cmm_smp_mb();
357
358 test_go = 1;
359
360 sleep(duration);
361
362 test_stop = 1;
363
364 for (i = 0; i < nr_readers; i++) {
365 err = pthread_join(tid_reader[i], &tret);
366 if (err != 0)
367 exit(1);
368 tot_reads += count_reader[i];
369 }
370 for (i = 0; i < nr_writers; i++) {
371 err = pthread_join(tid_writer[i], &tret);
372 if (err != 0)
373 exit(1);
374 tot_writes += count_writer[i];
375 }
376
377 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
378 tot_writes);
379 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
380 "nr_writers %3u "
381 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
382 argv[0], duration, nr_readers, rduration, wduration,
383 nr_writers, wdelay, tot_reads, tot_writes,
384 tot_reads + tot_writes);
385
386 free(tid_reader);
387 free(tid_writer);
388 free(count_reader);
389 free(count_writer);
390 return 0;
391 }
This page took 0.054293 seconds and 4 git commands to generate.