Documentation: rculfhash: cds_lfht_resize not within read-side C.S.
[urcu.git] / tests / test_urcu_bp.c
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1/*
2 * test_urcu.c
3 *
4 * Userspace RCU library - test program
5 *
6982d6d7 6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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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
d8540fc5 24#include "../config.h"
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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>
94b343fd 34#include <errno.h>
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35
36#include <urcu/arch.h>
bd252a04 37#include <urcu/tls-compat.h>
2953b501 38#include "cpuset.h"
fdee2e6d 39
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40#ifdef __linux__
41#include <syscall.h>
42#endif
43
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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)
50static inline pid_t gettid(void)
51{
52 return syscall(__NR_gettid);
53}
54#else
55#warning "use pid as tid"
56static inline pid_t gettid(void)
57{
58 return getpid();
59}
60#endif
61
62#ifndef DYNAMIC_LINK_TEST
63#define _LGPL_SOURCE
64#else
1de4df4b 65#define rcu_debug_yield_read()
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66#endif
67#include <urcu-bp.h>
68
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69static volatile int test_go, test_stop;
70
71static unsigned long wdelay;
72
bcc74df3 73static int *test_rcu_pointer;
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74
75static unsigned long duration;
76
77/* read-side C.S. duration, in loops */
78static unsigned long rduration;
79
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80/* write-side C.S. duration, in loops */
81static unsigned long wduration;
82
ab0aacbe 83static inline void loop_sleep(unsigned long loops)
fdee2e6d 84{
ab0aacbe 85 while (loops-- != 0)
06f22bdb 86 caa_cpu_relax();
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87}
88
89static int verbose_mode;
90
91#define printf_verbose(fmt, args...) \
92 do { \
93 if (verbose_mode) \
94 printf(fmt, args); \
95 } while (0)
96
97static unsigned int cpu_affinities[NR_CPUS];
98static unsigned int next_aff = 0;
99static int use_affinity = 0;
100
101pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
102
103static void set_affinity(void)
104{
95bc7fb9 105#if HAVE_SCHED_SETAFFINITY
fdee2e6d 106 cpu_set_t mask;
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107 int cpu, ret;
108#endif /* HAVE_SCHED_SETAFFINITY */
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109
110 if (!use_affinity)
111 return;
112
d8540fc5 113#if HAVE_SCHED_SETAFFINITY
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114 ret = pthread_mutex_lock(&affinity_mutex);
115 if (ret) {
116 perror("Error in pthread mutex lock");
117 exit(-1);
118 }
119 cpu = cpu_affinities[next_aff++];
120 ret = pthread_mutex_unlock(&affinity_mutex);
121 if (ret) {
122 perror("Error in pthread mutex unlock");
123 exit(-1);
124 }
d8540fc5 125
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126 CPU_ZERO(&mask);
127 CPU_SET(cpu, &mask);
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128#if SCHED_SETAFFINITY_ARGS == 2
129 sched_setaffinity(0, &mask);
130#else
fdee2e6d 131 sched_setaffinity(0, sizeof(mask), &mask);
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132#endif
133#endif /* HAVE_SCHED_SETAFFINITY */
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134}
135
136/*
137 * returns 0 if test should end.
138 */
139static int test_duration_write(void)
140{
141 return !test_stop;
142}
143
144static int test_duration_read(void)
145{
146 return !test_stop;
147}
148
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149static DEFINE_URCU_TLS(unsigned long long, nr_writes);
150static DEFINE_URCU_TLS(unsigned long long, nr_reads);
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151
152static unsigned int nr_readers;
153static unsigned int nr_writers;
154
155pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
156
157void rcu_copy_mutex_lock(void)
158{
159 int ret;
160 ret = pthread_mutex_lock(&rcu_copy_mutex);
161 if (ret) {
162 perror("Error in pthread mutex lock");
163 exit(-1);
164 }
165}
166
167void rcu_copy_mutex_unlock(void)
168{
169 int ret;
170
171 ret = pthread_mutex_unlock(&rcu_copy_mutex);
172 if (ret) {
173 perror("Error in pthread mutex unlock");
174 exit(-1);
175 }
176}
177
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178void *thr_reader(void *_count)
179{
180 unsigned long long *count = _count;
bcc74df3 181 int *local_ptr;
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182
183 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
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184 "reader", (unsigned long) pthread_self(),
185 (unsigned long) gettid());
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186
187 set_affinity();
188
189 rcu_register_thread();
882f3357 190 assert(!rcu_read_ongoing());
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191
192 while (!test_go)
193 {
194 }
5481ddb3 195 cmm_smp_mb();
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196
197 for (;;) {
198 rcu_read_lock();
882f3357 199 assert(rcu_read_ongoing());
fdee2e6d 200 local_ptr = rcu_dereference(test_rcu_pointer);
1de4df4b 201 rcu_debug_yield_read();
fdee2e6d 202 if (local_ptr)
bcc74df3 203 assert(*local_ptr == 8);
a0b7f7ea 204 if (caa_unlikely(rduration))
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205 loop_sleep(rduration);
206 rcu_read_unlock();
bd252a04 207 URCU_TLS(nr_reads)++;
a0b7f7ea 208 if (caa_unlikely(!test_duration_read()))
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209 break;
210 }
211
212 rcu_unregister_thread();
213
bd252a04 214 *count = URCU_TLS(nr_reads);
fdee2e6d 215 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
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216 "reader", (unsigned long) pthread_self(),
217 (unsigned long) gettid());
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218 return ((void*)1);
219
220}
221
222void *thr_writer(void *_count)
223{
224 unsigned long long *count = _count;
bcc74df3 225 int *new, *old;
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226
227 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
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228 "writer", (unsigned long) pthread_self(),
229 (unsigned long) gettid());
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230
231 set_affinity();
232
233 while (!test_go)
234 {
235 }
5481ddb3 236 cmm_smp_mb();
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237
238 for (;;) {
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239 new = malloc(sizeof(int));
240 *new = 8;
d2835e6f 241 old = rcu_xchg_pointer(&test_rcu_pointer, new);
a0b7f7ea 242 if (caa_unlikely(wduration))
31b598e0 243 loop_sleep(wduration);
d2835e6f 244 synchronize_rcu();
fdee2e6d 245 if (old)
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246 *old = 0;
247 free(old);
bd252a04 248 URCU_TLS(nr_writes)++;
a0b7f7ea 249 if (caa_unlikely(!test_duration_write()))
fdee2e6d 250 break;
a0b7f7ea 251 if (caa_unlikely(wdelay))
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252 loop_sleep(wdelay);
253 }
254
255 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
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256 "writer", (unsigned long) pthread_self(),
257 (unsigned long) gettid());
bd252a04 258 *count = URCU_TLS(nr_writes);
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259 return ((void*)2);
260}
261
262void show_usage(int argc, char **argv)
263{
264 printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
265#ifdef DEBUG_YIELD
266 printf(" [-r] [-w] (yield reader and/or writer)");
267#endif
268 printf(" [-d delay] (writer period (us))");
269 printf(" [-c duration] (reader C.S. duration (in loops))");
31b598e0 270 printf(" [-e duration] (writer C.S. duration (in loops))");
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271 printf(" [-v] (verbose output)");
272 printf(" [-a cpu#] [-a cpu#]... (affinity)");
273 printf("\n");
274}
275
276int main(int argc, char **argv)
277{
278 int err;
279 pthread_t *tid_reader, *tid_writer;
280 void *tret;
281 unsigned long long *count_reader, *count_writer;
282 unsigned long long tot_reads = 0, tot_writes = 0;
283 int i, a;
284
285 if (argc < 4) {
286 show_usage(argc, argv);
287 return -1;
288 }
289
290 err = sscanf(argv[1], "%u", &nr_readers);
291 if (err != 1) {
292 show_usage(argc, argv);
293 return -1;
294 }
295
296 err = sscanf(argv[2], "%u", &nr_writers);
297 if (err != 1) {
298 show_usage(argc, argv);
299 return -1;
300 }
301
302 err = sscanf(argv[3], "%lu", &duration);
303 if (err != 1) {
304 show_usage(argc, argv);
305 return -1;
306 }
307
308 for (i = 4; i < argc; i++) {
309 if (argv[i][0] != '-')
310 continue;
311 switch (argv[i][1]) {
312#ifdef DEBUG_YIELD
313 case 'r':
1de4df4b 314 rcu_yield_active |= RCU_YIELD_READ;
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315 break;
316 case 'w':
1de4df4b 317 rcu_yield_active |= RCU_YIELD_WRITE;
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318 break;
319#endif
320 case 'a':
321 if (argc < i + 2) {
322 show_usage(argc, argv);
323 return -1;
324 }
325 a = atoi(argv[++i]);
326 cpu_affinities[next_aff++] = a;
327 use_affinity = 1;
328 printf_verbose("Adding CPU %d affinity\n", a);
329 break;
330 case 'c':
331 if (argc < i + 2) {
332 show_usage(argc, argv);
333 return -1;
334 }
335 rduration = atol(argv[++i]);
336 break;
337 case 'd':
338 if (argc < i + 2) {
339 show_usage(argc, argv);
340 return -1;
341 }
342 wdelay = atol(argv[++i]);
343 break;
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344 case 'e':
345 if (argc < i + 2) {
346 show_usage(argc, argv);
347 return -1;
348 }
349 wduration = atol(argv[++i]);
350 break;
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351 case 'v':
352 verbose_mode = 1;
353 break;
354 }
355 }
356
357 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
358 duration, nr_readers, nr_writers);
359 printf_verbose("Writer delay : %lu loops.\n", wdelay);
360 printf_verbose("Reader duration : %lu loops.\n", rduration);
361 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
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362 "main", (unsigned long) pthread_self(),
363 (unsigned long) gettid());
fdee2e6d 364
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365 tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
366 tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
367 count_reader = malloc(sizeof(*count_reader) * nr_readers);
368 count_writer = malloc(sizeof(*count_writer) * nr_writers);
369
370 next_aff = 0;
371
372 for (i = 0; i < nr_readers; i++) {
373 err = pthread_create(&tid_reader[i], NULL, thr_reader,
374 &count_reader[i]);
375 if (err != 0)
376 exit(1);
377 }
378 for (i = 0; i < nr_writers; i++) {
379 err = pthread_create(&tid_writer[i], NULL, thr_writer,
380 &count_writer[i]);
381 if (err != 0)
382 exit(1);
383 }
384
5481ddb3 385 cmm_smp_mb();
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386
387 test_go = 1;
388
389 sleep(duration);
390
391 test_stop = 1;
392
393 for (i = 0; i < nr_readers; i++) {
394 err = pthread_join(tid_reader[i], &tret);
395 if (err != 0)
396 exit(1);
397 tot_reads += count_reader[i];
398 }
399 for (i = 0; i < nr_writers; i++) {
400 err = pthread_join(tid_writer[i], &tret);
401 if (err != 0)
402 exit(1);
403 tot_writes += count_writer[i];
404 }
405
406 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
407 tot_writes);
a50a7b43 408 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
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409 "nr_writers %3u "
410 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
a50a7b43 411 argv[0], duration, nr_readers, rduration, wduration,
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412 nr_writers, wdelay, tot_reads, tot_writes,
413 tot_reads + tot_writes);
bcc74df3 414 free(test_rcu_pointer);
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415 free(tid_reader);
416 free(tid_writer);
417 free(count_reader);
418 free(count_writer);
419 return 0;
420}
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