Remove bogus ; from defines
[urcu.git] / tests / test_urcu_assign.c
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1/*
2 * test_urcu_assign.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#define _GNU_SOURCE
24#include <stdio.h>
25#include <pthread.h>
26#include <stdlib.h>
27#include <string.h>
28#include <sys/types.h>
29#include <sys/wait.h>
30#include <unistd.h>
31#include <stdio.h>
32#include <assert.h>
33#include <sys/syscall.h>
34#include <sched.h>
94b343fd 35#include <errno.h>
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36
37#include <urcu/arch.h>
38
39/* hardcoded number of CPUs */
40#define NR_CPUS 16384
41
42#if defined(_syscall0)
43_syscall0(pid_t, gettid)
44#elif defined(__NR_gettid)
45static inline pid_t gettid(void)
46{
47 return syscall(__NR_gettid);
48}
49#else
50#warning "use pid as tid"
51static inline pid_t gettid(void)
52{
53 return getpid();
54}
55#endif
56
57#ifndef DYNAMIC_LINK_TEST
58#define _LGPL_SOURCE
59#else
60#define debug_yield_read()
61#endif
62#include <urcu.h>
63
64struct test_array {
65 int a;
66};
67
68static volatile int test_go, test_stop;
69
70static unsigned long wdelay;
71
72static struct test_array *test_rcu_pointer;
73
74static unsigned long duration;
75
76/* read-side C.S. duration, in loops */
77static unsigned long rduration;
78
79static inline void loop_sleep(unsigned long l)
80{
81 while(l-- != 0)
82 cpu_relax();
83}
84
85static int verbose_mode;
86
87#define printf_verbose(fmt, args...) \
88 do { \
89 if (verbose_mode) \
90 printf(fmt, args); \
91 } while (0)
92
93static unsigned int cpu_affinities[NR_CPUS];
94static unsigned int next_aff = 0;
95static int use_affinity = 0;
96
97pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
98
99static void set_affinity(void)
100{
101 cpu_set_t mask;
102 int cpu;
103 int ret;
104
105 if (!use_affinity)
106 return;
107
108 ret = pthread_mutex_lock(&affinity_mutex);
109 if (ret) {
110 perror("Error in pthread mutex lock");
111 exit(-1);
112 }
113 cpu = cpu_affinities[next_aff++];
114 ret = pthread_mutex_unlock(&affinity_mutex);
115 if (ret) {
116 perror("Error in pthread mutex unlock");
117 exit(-1);
118 }
119 CPU_ZERO(&mask);
120 CPU_SET(cpu, &mask);
121 sched_setaffinity(0, sizeof(mask), &mask);
122}
123
124/*
125 * returns 0 if test should end.
126 */
127static int test_duration_write(void)
128{
129 return !test_stop;
130}
131
132static int test_duration_read(void)
133{
134 return !test_stop;
135}
136
137static unsigned long long __thread nr_writes;
138static unsigned long long __thread nr_reads;
139
140static unsigned int nr_readers;
141static unsigned int nr_writers;
142
143pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
144
145void 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
155void 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/*
167 * malloc/free are reusing memory areas too quickly, which does not let us
168 * test races appropriately. Use a large circular array for allocations.
169 * ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail.
170 */
171#define ARRAY_SIZE (1048576 * nr_writers)
172#define ARRAY_POISON 0xDEADBEEF
173static int array_index;
174static struct test_array *test_array;
175
176static struct test_array *test_array_alloc(void)
177{
178 struct test_array *ret;
179 int index;
180
181 rcu_copy_mutex_lock();
182 index = array_index % ARRAY_SIZE;
183 assert(test_array[index].a == ARRAY_POISON ||
184 test_array[index].a == 0);
185 ret = &test_array[index];
186 array_index++;
187 if (array_index == ARRAY_SIZE)
188 array_index = 0;
189 rcu_copy_mutex_unlock();
190 return ret;
191}
192
193static void test_array_free(struct test_array *ptr)
194{
195 if (!ptr)
196 return;
197 rcu_copy_mutex_lock();
198 ptr->a = ARRAY_POISON;
199 rcu_copy_mutex_unlock();
200}
201
202void *thr_reader(void *_count)
203{
204 unsigned long long *count = _count;
205 struct test_array *local_ptr;
206
207 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
208 "reader", pthread_self(), (unsigned long)gettid());
209
210 set_affinity();
211
212 rcu_register_thread();
213
214 while (!test_go)
215 {
216 }
217 smp_mb();
218
219 for (;;) {
220 rcu_read_lock();
221 local_ptr = rcu_dereference(test_rcu_pointer);
222 debug_yield_read();
223 if (local_ptr)
224 assert(local_ptr->a == 8);
225 if (unlikely(rduration))
226 loop_sleep(rduration);
227 rcu_read_unlock();
228 nr_reads++;
229 if (unlikely(!test_duration_read()))
230 break;
231 }
232
233 rcu_unregister_thread();
234
235 *count = nr_reads;
236 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
237 "reader", pthread_self(), (unsigned long)gettid());
238 return ((void*)1);
239
240}
241
242void *thr_writer(void *_count)
243{
244 unsigned long long *count = _count;
245 struct test_array *new, *old;
246
247 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
248 "writer", pthread_self(), (unsigned long)gettid());
249
250 set_affinity();
251
252 while (!test_go)
253 {
254 }
255 smp_mb();
256
257 for (;;) {
258 new = test_array_alloc();
259 new->a = 8;
260 rcu_copy_mutex_lock();
261 old = test_rcu_pointer;
262 rcu_assign_pointer(test_rcu_pointer, new);
263 rcu_copy_mutex_unlock();
264 synchronize_rcu();
265 if (old)
266 old->a = 0;
267 test_array_free(old);
268 nr_writes++;
269 if (unlikely(!test_duration_write()))
270 break;
271 if (unlikely(wdelay))
272 loop_sleep(wdelay);
273 }
274
275 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
276 "writer", pthread_self(), (unsigned long)gettid());
277 *count = nr_writes;
278 return ((void*)2);
279}
280
281void show_usage(int argc, char **argv)
282{
283 printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
284#ifdef DEBUG_YIELD
285 printf(" [-r] [-w] (yield reader and/or writer)");
286#endif
287 printf(" [-d delay] (writer period (us))");
288 printf(" [-c duration] (reader C.S. duration (in loops))");
289 printf(" [-v] (verbose output)");
290 printf(" [-a cpu#] [-a cpu#]... (affinity)");
291 printf("\n");
292}
293
294int main(int argc, char **argv)
295{
296 int err;
297 pthread_t *tid_reader, *tid_writer;
298 void *tret;
299 unsigned long long *count_reader, *count_writer;
300 unsigned long long tot_reads = 0, tot_writes = 0;
301 int i, a;
302
303 if (argc < 4) {
304 show_usage(argc, argv);
305 return -1;
306 }
307
308 err = sscanf(argv[1], "%u", &nr_readers);
309 if (err != 1) {
310 show_usage(argc, argv);
311 return -1;
312 }
313
314 err = sscanf(argv[2], "%u", &nr_writers);
315 if (err != 1) {
316 show_usage(argc, argv);
317 return -1;
318 }
319
320 err = sscanf(argv[3], "%lu", &duration);
321 if (err != 1) {
322 show_usage(argc, argv);
323 return -1;
324 }
325
326 for (i = 4; i < argc; i++) {
327 if (argv[i][0] != '-')
328 continue;
329 switch (argv[i][1]) {
330#ifdef DEBUG_YIELD
331 case 'r':
332 yield_active |= YIELD_READ;
333 break;
334 case 'w':
335 yield_active |= YIELD_WRITE;
336 break;
337#endif
338 case 'a':
339 if (argc < i + 2) {
340 show_usage(argc, argv);
341 return -1;
342 }
343 a = atoi(argv[++i]);
344 cpu_affinities[next_aff++] = a;
345 use_affinity = 1;
346 printf_verbose("Adding CPU %d affinity\n", a);
347 break;
348 case 'c':
349 if (argc < i + 2) {
350 show_usage(argc, argv);
351 return -1;
352 }
353 rduration = atol(argv[++i]);
354 break;
355 case 'd':
356 if (argc < i + 2) {
357 show_usage(argc, argv);
358 return -1;
359 }
360 wdelay = atol(argv[++i]);
361 break;
362 case 'v':
363 verbose_mode = 1;
364 break;
365 }
366 }
367
368 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
369 duration, nr_readers, nr_writers);
370 printf_verbose("Writer delay : %lu loops.\n", wdelay);
371 printf_verbose("Reader duration : %lu loops.\n", rduration);
372 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
373 "main", pthread_self(), (unsigned long)gettid());
374
375 test_array = malloc(sizeof(*test_array) * ARRAY_SIZE);
376 tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
377 tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
378 count_reader = malloc(sizeof(*count_reader) * nr_readers);
379 count_writer = malloc(sizeof(*count_writer) * nr_writers);
380
381 next_aff = 0;
382
383 for (i = 0; i < nr_readers; i++) {
384 err = pthread_create(&tid_reader[i], NULL, thr_reader,
385 &count_reader[i]);
386 if (err != 0)
387 exit(1);
388 }
389 for (i = 0; i < nr_writers; i++) {
390 err = pthread_create(&tid_writer[i], NULL, thr_writer,
391 &count_writer[i]);
392 if (err != 0)
393 exit(1);
394 }
395
396 smp_mb();
397
398 test_go = 1;
399
400 sleep(duration);
401
402 test_stop = 1;
403
404 for (i = 0; i < nr_readers; i++) {
405 err = pthread_join(tid_reader[i], &tret);
406 if (err != 0)
407 exit(1);
408 tot_reads += count_reader[i];
409 }
410 for (i = 0; i < nr_writers; i++) {
411 err = pthread_join(tid_writer[i], &tret);
412 if (err != 0)
413 exit(1);
414 tot_writes += count_writer[i];
415 }
416
417 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
418 tot_writes);
419 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
420 "nr_writers %3u "
421 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
422 argv[0], duration, nr_readers, rduration,
423 nr_writers, wdelay, tot_reads, tot_writes,
424 tot_reads + tot_writes);
425 test_array_free(test_rcu_pointer);
426 free(test_array);
427 free(tid_reader);
428 free(tid_writer);
429 free(count_reader);
430 free(count_writer);
431 return 0;
432}
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