b787364ee8023045220ab2c868b2a8da3682b5e9
[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 <sched.h>
35 #include <errno.h>
36
37 #include <urcu/arch.h>
38 #include <urcu/tls-compat.h>
39
40 #ifdef __linux__
41 #include <syscall.h>
42 #endif
43
44 /* hardcoded number of CPUs */
45 #define NR_CPUS 16384
46
47 #if defined(_syscall0)
48 _syscall0(pid_t, gettid)
49 #elif defined(__NR_gettid)
50 static inline pid_t gettid(void)
51 {
52 return syscall(__NR_gettid);
53 }
54 #else
55 #warning "use pid as tid"
56 static inline pid_t gettid(void)
57 {
58 return getpid();
59 }
60 #endif
61
62 #ifndef DYNAMIC_LINK_TEST
63 #define _LGPL_SOURCE
64 #else
65 #define debug_yield_read()
66 #endif
67 #include <urcu.h>
68
69 struct test_array {
70 int a;
71 };
72
73 pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;
74
75 static volatile int test_go, test_stop;
76
77 static unsigned long wdelay;
78
79 static volatile struct test_array test_array = { 8 };
80
81 static unsigned long duration;
82
83 /* read-side C.S. duration, in loops */
84 static unsigned long rduration;
85
86 /* write-side C.S. duration, in loops */
87 static unsigned long wduration;
88
89 static inline void loop_sleep(unsigned long loops)
90 {
91 while (loops-- != 0)
92 caa_cpu_relax();
93 }
94
95 static int verbose_mode;
96
97 #define printf_verbose(fmt, args...) \
98 do { \
99 if (verbose_mode) \
100 printf(fmt, args); \
101 } while (0)
102
103 static unsigned int cpu_affinities[NR_CPUS];
104 static unsigned int next_aff = 0;
105 static int use_affinity = 0;
106
107 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
108
109 #ifndef HAVE_CPU_SET_T
110 typedef unsigned long cpu_set_t;
111 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
112 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
113 #endif
114
115 static void set_affinity(void)
116 {
117 #if HAVE_SCHED_SETAFFINITY
118 cpu_set_t mask;
119 int cpu, ret;
120 #endif /* HAVE_SCHED_SETAFFINITY */
121
122 if (!use_affinity)
123 return;
124
125 #if HAVE_SCHED_SETAFFINITY
126 ret = pthread_mutex_lock(&affinity_mutex);
127 if (ret) {
128 perror("Error in pthread mutex lock");
129 exit(-1);
130 }
131 cpu = cpu_affinities[next_aff++];
132 ret = pthread_mutex_unlock(&affinity_mutex);
133 if (ret) {
134 perror("Error in pthread mutex unlock");
135 exit(-1);
136 }
137
138 CPU_ZERO(&mask);
139 CPU_SET(cpu, &mask);
140 #if SCHED_SETAFFINITY_ARGS == 2
141 sched_setaffinity(0, &mask);
142 #else
143 sched_setaffinity(0, sizeof(mask), &mask);
144 #endif
145 #endif /* HAVE_SCHED_SETAFFINITY */
146 }
147
148 /*
149 * returns 0 if test should end.
150 */
151 static int test_duration_write(void)
152 {
153 return !test_stop;
154 }
155
156 static int test_duration_read(void)
157 {
158 return !test_stop;
159 }
160
161 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
162 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
163
164 static unsigned int nr_readers;
165 static unsigned int nr_writers;
166
167 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
168
169 void rcu_copy_mutex_lock(void)
170 {
171 int ret;
172 ret = pthread_mutex_lock(&rcu_copy_mutex);
173 if (ret) {
174 perror("Error in pthread mutex lock");
175 exit(-1);
176 }
177 }
178
179 void rcu_copy_mutex_unlock(void)
180 {
181 int ret;
182
183 ret = pthread_mutex_unlock(&rcu_copy_mutex);
184 if (ret) {
185 perror("Error in pthread mutex unlock");
186 exit(-1);
187 }
188 }
189
190 void *thr_reader(void *_count)
191 {
192 unsigned long long *count = _count;
193
194 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
195 "reader", (unsigned long) pthread_self(),
196 (unsigned long) gettid());
197
198 set_affinity();
199
200 while (!test_go)
201 {
202 }
203
204 for (;;) {
205 pthread_rwlock_rdlock(&lock);
206 assert(test_array.a == 8);
207 if (caa_unlikely(rduration))
208 loop_sleep(rduration);
209 pthread_rwlock_unlock(&lock);
210 URCU_TLS(nr_reads)++;
211 if (caa_unlikely(!test_duration_read()))
212 break;
213 }
214
215 *count = URCU_TLS(nr_reads);
216 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
217 "reader", (unsigned long) pthread_self(),
218 (unsigned long) gettid());
219 return ((void*)1);
220
221 }
222
223 void *thr_writer(void *_count)
224 {
225 unsigned long long *count = _count;
226
227 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
228 "writer", (unsigned long) pthread_self(),
229 (unsigned long) gettid());
230
231 set_affinity();
232
233 while (!test_go)
234 {
235 }
236 cmm_smp_mb();
237
238 for (;;) {
239 pthread_rwlock_wrlock(&lock);
240 test_array.a = 0;
241 test_array.a = 8;
242 if (caa_unlikely(wduration))
243 loop_sleep(wduration);
244 pthread_rwlock_unlock(&lock);
245 URCU_TLS(nr_writes)++;
246 if (caa_unlikely(!test_duration_write()))
247 break;
248 if (caa_unlikely(wdelay))
249 loop_sleep(wdelay);
250 }
251
252 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
253 "writer", (unsigned long) pthread_self(),
254 (unsigned long) gettid());
255 *count = URCU_TLS(nr_writes);
256 return ((void*)2);
257 }
258
259 void show_usage(int argc, char **argv)
260 {
261 printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
262 #ifdef DEBUG_YIELD
263 printf(" [-r] [-w] (yield reader and/or writer)");
264 #endif
265 printf(" [-d delay] (writer period (us))");
266 printf(" [-c duration] (reader C.S. duration (in loops))");
267 printf(" [-e duration] (writer C.S. duration (in loops))");
268 printf(" [-v] (verbose output)");
269 printf(" [-a cpu#] [-a cpu#]... (affinity)");
270 printf("\n");
271 }
272
273 int main(int argc, char **argv)
274 {
275 int err;
276 pthread_t *tid_reader, *tid_writer;
277 void *tret;
278 unsigned long long *count_reader, *count_writer;
279 unsigned long long tot_reads = 0, tot_writes = 0;
280 int i, a;
281
282 if (argc < 4) {
283 show_usage(argc, argv);
284 return -1;
285 }
286 cmm_smp_mb();
287
288 err = sscanf(argv[1], "%u", &nr_readers);
289 if (err != 1) {
290 show_usage(argc, argv);
291 return -1;
292 }
293
294 err = sscanf(argv[2], "%u", &nr_writers);
295 if (err != 1) {
296 show_usage(argc, argv);
297 return -1;
298 }
299
300 err = sscanf(argv[3], "%lu", &duration);
301 if (err != 1) {
302 show_usage(argc, argv);
303 return -1;
304 }
305
306 for (i = 4; i < argc; i++) {
307 if (argv[i][0] != '-')
308 continue;
309 switch (argv[i][1]) {
310 #ifdef DEBUG_YIELD
311 case 'r':
312 yield_active |= YIELD_READ;
313 break;
314 case 'w':
315 yield_active |= YIELD_WRITE;
316 break;
317 #endif
318 case 'a':
319 if (argc < i + 2) {
320 show_usage(argc, argv);
321 return -1;
322 }
323 a = atoi(argv[++i]);
324 cpu_affinities[next_aff++] = a;
325 use_affinity = 1;
326 printf_verbose("Adding CPU %d affinity\n", a);
327 break;
328 case 'c':
329 if (argc < i + 2) {
330 show_usage(argc, argv);
331 return -1;
332 }
333 rduration = atol(argv[++i]);
334 break;
335 case 'd':
336 if (argc < i + 2) {
337 show_usage(argc, argv);
338 return -1;
339 }
340 wdelay = atol(argv[++i]);
341 break;
342 case 'e':
343 if (argc < i + 2) {
344 show_usage(argc, argv);
345 return -1;
346 }
347 wduration = atol(argv[++i]);
348 break;
349 case 'v':
350 verbose_mode = 1;
351 break;
352 }
353 }
354
355 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
356 duration, nr_readers, nr_writers);
357 printf_verbose("Writer delay : %lu loops.\n", wdelay);
358 printf_verbose("Reader duration : %lu loops.\n", rduration);
359 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
360 "main", (unsigned long) pthread_self(),
361 (unsigned long) gettid());
362
363 tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
364 tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
365 count_reader = malloc(sizeof(*count_reader) * nr_readers);
366 count_writer = malloc(sizeof(*count_writer) * nr_writers);
367
368 next_aff = 0;
369
370 for (i = 0; i < nr_readers; i++) {
371 err = pthread_create(&tid_reader[i], NULL, thr_reader,
372 &count_reader[i]);
373 if (err != 0)
374 exit(1);
375 }
376 for (i = 0; i < nr_writers; i++) {
377 err = pthread_create(&tid_writer[i], NULL, thr_writer,
378 &count_writer[i]);
379 if (err != 0)
380 exit(1);
381 }
382
383 cmm_smp_mb();
384
385 test_go = 1;
386
387 sleep(duration);
388
389 test_stop = 1;
390
391 for (i = 0; i < nr_readers; i++) {
392 err = pthread_join(tid_reader[i], &tret);
393 if (err != 0)
394 exit(1);
395 tot_reads += count_reader[i];
396 }
397 for (i = 0; i < nr_writers; i++) {
398 err = pthread_join(tid_writer[i], &tret);
399 if (err != 0)
400 exit(1);
401 tot_writes += count_writer[i];
402 }
403
404 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
405 tot_writes);
406 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
407 "nr_writers %3u "
408 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
409 argv[0], duration, nr_readers, rduration, wduration,
410 nr_writers, wdelay, tot_reads, tot_writes,
411 tot_reads + tot_writes);
412
413 free(tid_reader);
414 free(tid_writer);
415 free(count_reader);
416 free(count_writer);
417 return 0;
418 }
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