Update to version 0.4.1
[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
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>
34#include <sys/syscall.h>
35#include <sched.h>
94b343fd 36#include <errno.h>
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37
38#include <urcu/arch.h>
39
40/* hardcoded number of CPUs */
41#define NR_CPUS 16384
42
43#if defined(_syscall0)
44_syscall0(pid_t, gettid)
45#elif defined(__NR_gettid)
46static inline pid_t gettid(void)
47{
48 return syscall(__NR_gettid);
49}
50#else
51#warning "use pid as tid"
52static inline pid_t gettid(void)
53{
54 return getpid();
55}
56#endif
57
58#ifndef DYNAMIC_LINK_TEST
59#define _LGPL_SOURCE
60#else
61#define debug_yield_read()
62#endif
63#include <urcu.h>
64
65struct test_array {
66 int a;
67};
68
69static volatile int test_go, test_stop;
70
71static unsigned long wdelay;
72
73static struct test_array *test_rcu_pointer;
74
75static unsigned long duration;
76
77/* read-side C.S. duration, in loops */
78static unsigned long rduration;
79
80static inline void loop_sleep(unsigned long l)
81{
82 while(l-- != 0)
83 cpu_relax();
84}
85
86static int verbose_mode;
87
88#define printf_verbose(fmt, args...) \
89 do { \
90 if (verbose_mode) \
91 printf(fmt, args); \
92 } while (0)
93
94static unsigned int cpu_affinities[NR_CPUS];
95static unsigned int next_aff = 0;
96static int use_affinity = 0;
97
98pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
99
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100#ifndef HAVE_CPU_SET_T
101typedef unsigned long cpu_set_t;
102# define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
103# define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
104#endif
105
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106static void set_affinity(void)
107{
108 cpu_set_t mask;
109 int cpu;
110 int ret;
111
112 if (!use_affinity)
113 return;
114
d8540fc5 115#if HAVE_SCHED_SETAFFINITY
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116 ret = pthread_mutex_lock(&affinity_mutex);
117 if (ret) {
118 perror("Error in pthread mutex lock");
119 exit(-1);
120 }
121 cpu = cpu_affinities[next_aff++];
122 ret = pthread_mutex_unlock(&affinity_mutex);
123 if (ret) {
124 perror("Error in pthread mutex unlock");
125 exit(-1);
126 }
d8540fc5 127
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128 CPU_ZERO(&mask);
129 CPU_SET(cpu, &mask);
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130#if SCHED_SETAFFINITY_ARGS == 2
131 sched_setaffinity(0, &mask);
132#else
074d8438 133 sched_setaffinity(0, sizeof(mask), &mask);
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134#endif
135#endif /* HAVE_SCHED_SETAFFINITY */
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136}
137
138/*
139 * returns 0 if test should end.
140 */
141static int test_duration_write(void)
142{
143 return !test_stop;
144}
145
146static int test_duration_read(void)
147{
148 return !test_stop;
149}
150
151static unsigned long long __thread nr_writes;
152static unsigned long long __thread nr_reads;
153
154static unsigned int nr_readers;
155static unsigned int nr_writers;
156
157pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
158
159void rcu_copy_mutex_lock(void)
160{
161 int ret;
162 ret = pthread_mutex_lock(&rcu_copy_mutex);
163 if (ret) {
164 perror("Error in pthread mutex lock");
165 exit(-1);
166 }
167}
168
169void rcu_copy_mutex_unlock(void)
170{
171 int ret;
172
173 ret = pthread_mutex_unlock(&rcu_copy_mutex);
174 if (ret) {
175 perror("Error in pthread mutex unlock");
176 exit(-1);
177 }
178}
179
180/*
181 * malloc/free are reusing memory areas too quickly, which does not let us
182 * test races appropriately. Use a large circular array for allocations.
183 * ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail.
184 */
185#define ARRAY_SIZE (1048576 * nr_writers)
186#define ARRAY_POISON 0xDEADBEEF
187static int array_index;
188static struct test_array *test_array;
189
190static struct test_array *test_array_alloc(void)
191{
192 struct test_array *ret;
193 int index;
194
195 rcu_copy_mutex_lock();
196 index = array_index % ARRAY_SIZE;
197 assert(test_array[index].a == ARRAY_POISON ||
198 test_array[index].a == 0);
199 ret = &test_array[index];
200 array_index++;
201 if (array_index == ARRAY_SIZE)
202 array_index = 0;
203 rcu_copy_mutex_unlock();
204 return ret;
205}
206
207static void test_array_free(struct test_array *ptr)
208{
209 if (!ptr)
210 return;
211 rcu_copy_mutex_lock();
212 ptr->a = ARRAY_POISON;
213 rcu_copy_mutex_unlock();
214}
215
216void *thr_reader(void *_count)
217{
218 unsigned long long *count = _count;
219 struct test_array *local_ptr;
220
221 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
222 "reader", pthread_self(), (unsigned long)gettid());
223
224 set_affinity();
225
226 rcu_register_thread();
227
228 while (!test_go)
229 {
230 }
231 smp_mb();
232
233 for (;;) {
234 rcu_read_lock();
235 local_ptr = rcu_dereference(test_rcu_pointer);
236 debug_yield_read();
237 if (local_ptr)
238 assert(local_ptr->a == 8);
239 if (unlikely(rduration))
240 loop_sleep(rduration);
241 rcu_read_unlock();
242 nr_reads++;
243 if (unlikely(!test_duration_read()))
244 break;
245 }
246
247 rcu_unregister_thread();
248
249 *count = nr_reads;
250 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
251 "reader", pthread_self(), (unsigned long)gettid());
252 return ((void*)1);
253
254}
255
256void *thr_writer(void *_count)
257{
258 unsigned long long *count = _count;
259 struct test_array *new, *old;
260
261 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
262 "writer", pthread_self(), (unsigned long)gettid());
263
264 set_affinity();
265
266 while (!test_go)
267 {
268 }
269 smp_mb();
270
271 for (;;) {
272 new = test_array_alloc();
273 new->a = 8;
274 rcu_copy_mutex_lock();
275 old = test_rcu_pointer;
276 rcu_assign_pointer(test_rcu_pointer, new);
277 rcu_copy_mutex_unlock();
278 synchronize_rcu();
279 if (old)
280 old->a = 0;
281 test_array_free(old);
282 nr_writes++;
283 if (unlikely(!test_duration_write()))
284 break;
285 if (unlikely(wdelay))
286 loop_sleep(wdelay);
287 }
288
289 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
290 "writer", pthread_self(), (unsigned long)gettid());
291 *count = nr_writes;
292 return ((void*)2);
293}
294
295void show_usage(int argc, char **argv)
296{
297 printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
298#ifdef DEBUG_YIELD
299 printf(" [-r] [-w] (yield reader and/or writer)");
300#endif
301 printf(" [-d delay] (writer period (us))");
302 printf(" [-c duration] (reader C.S. duration (in loops))");
303 printf(" [-v] (verbose output)");
304 printf(" [-a cpu#] [-a cpu#]... (affinity)");
305 printf("\n");
306}
307
308int main(int argc, char **argv)
309{
310 int err;
311 pthread_t *tid_reader, *tid_writer;
312 void *tret;
313 unsigned long long *count_reader, *count_writer;
314 unsigned long long tot_reads = 0, tot_writes = 0;
315 int i, a;
316
317 if (argc < 4) {
318 show_usage(argc, argv);
319 return -1;
320 }
321
322 err = sscanf(argv[1], "%u", &nr_readers);
323 if (err != 1) {
324 show_usage(argc, argv);
325 return -1;
326 }
327
328 err = sscanf(argv[2], "%u", &nr_writers);
329 if (err != 1) {
330 show_usage(argc, argv);
331 return -1;
332 }
333
334 err = sscanf(argv[3], "%lu", &duration);
335 if (err != 1) {
336 show_usage(argc, argv);
337 return -1;
338 }
339
340 for (i = 4; i < argc; i++) {
341 if (argv[i][0] != '-')
342 continue;
343 switch (argv[i][1]) {
344#ifdef DEBUG_YIELD
345 case 'r':
346 yield_active |= YIELD_READ;
347 break;
348 case 'w':
349 yield_active |= YIELD_WRITE;
350 break;
351#endif
352 case 'a':
353 if (argc < i + 2) {
354 show_usage(argc, argv);
355 return -1;
356 }
357 a = atoi(argv[++i]);
358 cpu_affinities[next_aff++] = a;
359 use_affinity = 1;
360 printf_verbose("Adding CPU %d affinity\n", a);
361 break;
362 case 'c':
363 if (argc < i + 2) {
364 show_usage(argc, argv);
365 return -1;
366 }
367 rduration = atol(argv[++i]);
368 break;
369 case 'd':
370 if (argc < i + 2) {
371 show_usage(argc, argv);
372 return -1;
373 }
374 wdelay = atol(argv[++i]);
375 break;
376 case 'v':
377 verbose_mode = 1;
378 break;
379 }
380 }
381
382 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
383 duration, nr_readers, nr_writers);
384 printf_verbose("Writer delay : %lu loops.\n", wdelay);
385 printf_verbose("Reader duration : %lu loops.\n", rduration);
386 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
387 "main", pthread_self(), (unsigned long)gettid());
388
389 test_array = malloc(sizeof(*test_array) * ARRAY_SIZE);
390 tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
391 tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
392 count_reader = malloc(sizeof(*count_reader) * nr_readers);
393 count_writer = malloc(sizeof(*count_writer) * nr_writers);
394
395 next_aff = 0;
396
397 for (i = 0; i < nr_readers; i++) {
398 err = pthread_create(&tid_reader[i], NULL, thr_reader,
399 &count_reader[i]);
400 if (err != 0)
401 exit(1);
402 }
403 for (i = 0; i < nr_writers; i++) {
404 err = pthread_create(&tid_writer[i], NULL, thr_writer,
405 &count_writer[i]);
406 if (err != 0)
407 exit(1);
408 }
409
410 smp_mb();
411
412 test_go = 1;
413
414 sleep(duration);
415
416 test_stop = 1;
417
418 for (i = 0; i < nr_readers; i++) {
419 err = pthread_join(tid_reader[i], &tret);
420 if (err != 0)
421 exit(1);
422 tot_reads += count_reader[i];
423 }
424 for (i = 0; i < nr_writers; i++) {
425 err = pthread_join(tid_writer[i], &tret);
426 if (err != 0)
427 exit(1);
428 tot_writes += count_writer[i];
429 }
430
431 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
432 tot_writes);
433 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
434 "nr_writers %3u "
435 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
436 argv[0], duration, nr_readers, rduration,
437 nr_writers, wdelay, tot_reads, tot_writes,
438 tot_reads + tot_writes);
439 test_array_free(test_rcu_pointer);
440 free(test_array);
441 free(tid_reader);
442 free(tid_writer);
443 free(count_reader);
444 free(count_writer);
445 return 0;
446}
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