Fix tests: use of uninitialized variables
[userspace-rcu.git] / tests / test_urcu_assign.c
1 /*
2 * test_urcu_assign.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
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 static volatile int test_go, test_stop;
74
75 static unsigned long wdelay;
76
77 static struct test_array *test_rcu_pointer;
78
79 static unsigned long duration;
80
81 /* read-side C.S. duration, in loops */
82 static unsigned long rduration;
83
84 /* write-side C.S. duration, in loops */
85 static unsigned long wduration;
86
87 static inline void loop_sleep(unsigned long l)
88 {
89 while(l-- != 0)
90 caa_cpu_relax();
91 }
92
93 static int verbose_mode;
94
95 #define printf_verbose(fmt, args...) \
96 do { \
97 if (verbose_mode) \
98 printf(fmt, args); \
99 } while (0)
100
101 static unsigned int cpu_affinities[NR_CPUS];
102 static unsigned int next_aff = 0;
103 static int use_affinity = 0;
104
105 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
106
107 static void set_affinity(void)
108 {
109 cpu_set_t mask;
110 int cpu;
111 int ret;
112
113 if (!use_affinity)
114 return;
115
116 #if HAVE_SCHED_SETAFFINITY
117 ret = pthread_mutex_lock(&affinity_mutex);
118 if (ret) {
119 perror("Error in pthread mutex lock");
120 exit(-1);
121 }
122 cpu = cpu_affinities[next_aff++];
123 ret = pthread_mutex_unlock(&affinity_mutex);
124 if (ret) {
125 perror("Error in pthread mutex unlock");
126 exit(-1);
127 }
128
129 CPU_ZERO(&mask);
130 CPU_SET(cpu, &mask);
131 #if SCHED_SETAFFINITY_ARGS == 2
132 sched_setaffinity(0, &mask);
133 #else
134 sched_setaffinity(0, sizeof(mask), &mask);
135 #endif
136 #endif /* HAVE_SCHED_SETAFFINITY */
137 }
138
139 /*
140 * returns 0 if test should end.
141 */
142 static int test_duration_write(void)
143 {
144 return !test_stop;
145 }
146
147 static int test_duration_read(void)
148 {
149 return !test_stop;
150 }
151
152 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
153 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
154
155 static unsigned int nr_readers;
156 static unsigned int nr_writers;
157
158 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
159
160 void rcu_copy_mutex_lock(void)
161 {
162 int ret;
163 ret = pthread_mutex_lock(&rcu_copy_mutex);
164 if (ret) {
165 perror("Error in pthread mutex lock");
166 exit(-1);
167 }
168 }
169
170 void rcu_copy_mutex_unlock(void)
171 {
172 int ret;
173
174 ret = pthread_mutex_unlock(&rcu_copy_mutex);
175 if (ret) {
176 perror("Error in pthread mutex unlock");
177 exit(-1);
178 }
179 }
180
181 /*
182 * malloc/free are reusing memory areas too quickly, which does not let us
183 * test races appropriately. Use a large circular array for allocations.
184 * ARRAY_SIZE is larger than nr_writers, and we keep the mutex across
185 * both alloc and free, which insures we never run over our tail.
186 */
187 #define ARRAY_SIZE (1048576 * nr_writers)
188 #define ARRAY_POISON 0xDEADBEEF
189 static int array_index;
190 static struct test_array *test_array;
191
192 static struct test_array *test_array_alloc(void)
193 {
194 struct test_array *ret;
195 int index;
196
197 index = array_index % ARRAY_SIZE;
198 assert(test_array[index].a == ARRAY_POISON ||
199 test_array[index].a == 0);
200 ret = &test_array[index];
201 array_index++;
202 if (array_index == ARRAY_SIZE)
203 array_index = 0;
204 return ret;
205 }
206
207 static void test_array_free(struct test_array *ptr)
208 {
209 if (!ptr)
210 return;
211 ptr->a = ARRAY_POISON;
212 }
213
214 void *thr_reader(void *_count)
215 {
216 unsigned long long *count = _count;
217 struct test_array *local_ptr;
218
219 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
220 "reader", (unsigned long) pthread_self(),
221 (unsigned long) gettid());
222
223 set_affinity();
224
225 rcu_register_thread();
226
227 while (!test_go)
228 {
229 }
230 cmm_smp_mb();
231
232 for (;;) {
233 rcu_read_lock();
234 local_ptr = rcu_dereference(test_rcu_pointer);
235 debug_yield_read();
236 if (local_ptr)
237 assert(local_ptr->a == 8);
238 if (caa_unlikely(rduration))
239 loop_sleep(rduration);
240 rcu_read_unlock();
241 URCU_TLS(nr_reads)++;
242 if (caa_unlikely(!test_duration_read()))
243 break;
244 }
245
246 rcu_unregister_thread();
247
248 *count = URCU_TLS(nr_reads);
249 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
250 "reader", (unsigned long) pthread_self(),
251 (unsigned long) gettid());
252 return ((void*)1);
253
254 }
255
256 void *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", (unsigned long) pthread_self(),
263 (unsigned long) gettid());
264
265 set_affinity();
266
267 while (!test_go)
268 {
269 }
270 cmm_smp_mb();
271
272 for (;;) {
273 rcu_copy_mutex_lock();
274 new = test_array_alloc();
275 new->a = 8;
276 old = test_rcu_pointer;
277 rcu_assign_pointer(test_rcu_pointer, new);
278 if (caa_unlikely(wduration))
279 loop_sleep(wduration);
280 synchronize_rcu();
281 if (old)
282 old->a = 0;
283 test_array_free(old);
284 rcu_copy_mutex_unlock();
285 URCU_TLS(nr_writes)++;
286 if (caa_unlikely(!test_duration_write()))
287 break;
288 if (caa_unlikely(wdelay))
289 loop_sleep(wdelay);
290 }
291
292 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
293 "writer", (unsigned long) pthread_self(),
294 (unsigned long) gettid());
295 *count = URCU_TLS(nr_writes);
296 return ((void*)2);
297 }
298
299 void show_usage(int argc, char **argv)
300 {
301 printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
302 #ifdef DEBUG_YIELD
303 printf(" [-r] [-w] (yield reader and/or writer)");
304 #endif
305 printf(" [-d delay] (writer period (us))");
306 printf(" [-c duration] (reader C.S. duration (in loops))");
307 printf(" [-e duration] (writer C.S. duration (in loops))");
308 printf(" [-v] (verbose output)");
309 printf(" [-a cpu#] [-a cpu#]... (affinity)");
310 printf("\n");
311 }
312
313 int main(int argc, char **argv)
314 {
315 int err;
316 pthread_t *tid_reader, *tid_writer;
317 void *tret;
318 unsigned long long *count_reader, *count_writer;
319 unsigned long long tot_reads = 0, tot_writes = 0;
320 int i, a;
321
322 if (argc < 4) {
323 show_usage(argc, argv);
324 return -1;
325 }
326
327 err = sscanf(argv[1], "%u", &nr_readers);
328 if (err != 1) {
329 show_usage(argc, argv);
330 return -1;
331 }
332
333 err = sscanf(argv[2], "%u", &nr_writers);
334 if (err != 1) {
335 show_usage(argc, argv);
336 return -1;
337 }
338
339 err = sscanf(argv[3], "%lu", &duration);
340 if (err != 1) {
341 show_usage(argc, argv);
342 return -1;
343 }
344
345 for (i = 4; i < argc; i++) {
346 if (argv[i][0] != '-')
347 continue;
348 switch (argv[i][1]) {
349 #ifdef DEBUG_YIELD
350 case 'r':
351 yield_active |= YIELD_READ;
352 break;
353 case 'w':
354 yield_active |= YIELD_WRITE;
355 break;
356 #endif
357 case 'a':
358 if (argc < i + 2) {
359 show_usage(argc, argv);
360 return -1;
361 }
362 a = atoi(argv[++i]);
363 cpu_affinities[next_aff++] = a;
364 use_affinity = 1;
365 printf_verbose("Adding CPU %d affinity\n", a);
366 break;
367 case 'c':
368 if (argc < i + 2) {
369 show_usage(argc, argv);
370 return -1;
371 }
372 rduration = atol(argv[++i]);
373 break;
374 case 'd':
375 if (argc < i + 2) {
376 show_usage(argc, argv);
377 return -1;
378 }
379 wdelay = atol(argv[++i]);
380 break;
381 case 'e':
382 if (argc < i + 2) {
383 show_usage(argc, argv);
384 return -1;
385 }
386 wduration = atol(argv[++i]);
387 break;
388 case 'v':
389 verbose_mode = 1;
390 break;
391 }
392 }
393
394 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
395 duration, nr_readers, nr_writers);
396 printf_verbose("Writer delay : %lu loops.\n", wdelay);
397 printf_verbose("Reader duration : %lu loops.\n", rduration);
398 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
399 "main", (unsigned long) pthread_self(),
400 (unsigned long) gettid());
401
402 test_array = calloc(1, sizeof(*test_array) * ARRAY_SIZE);
403 tid_reader = calloc(nr_readers, sizeof(*tid_reader));
404 tid_writer = calloc(nr_writers, sizeof(*tid_writer));
405 count_reader = calloc(nr_readers, sizeof(*count_reader));
406 count_writer = calloc(nr_writers, sizeof(*count_writer));
407
408 next_aff = 0;
409
410 for (i = 0; i < nr_readers; i++) {
411 err = pthread_create(&tid_reader[i], NULL, thr_reader,
412 &count_reader[i]);
413 if (err != 0)
414 exit(1);
415 }
416 for (i = 0; i < nr_writers; i++) {
417 err = pthread_create(&tid_writer[i], NULL, thr_writer,
418 &count_writer[i]);
419 if (err != 0)
420 exit(1);
421 }
422
423 cmm_smp_mb();
424
425 test_go = 1;
426
427 sleep(duration);
428
429 test_stop = 1;
430
431 for (i = 0; i < nr_readers; i++) {
432 err = pthread_join(tid_reader[i], &tret);
433 if (err != 0)
434 exit(1);
435 tot_reads += count_reader[i];
436 }
437 for (i = 0; i < nr_writers; i++) {
438 err = pthread_join(tid_writer[i], &tret);
439 if (err != 0)
440 exit(1);
441 tot_writes += count_writer[i];
442 }
443
444 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
445 tot_writes);
446 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
447 "nr_writers %3u "
448 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
449 argv[0], duration, nr_readers, rduration, wduration,
450 nr_writers, wdelay, tot_reads, tot_writes,
451 tot_reads + tot_writes);
452 test_array_free(test_rcu_pointer);
453 free(test_array);
454 free(tid_reader);
455 free(tid_writer);
456 free(count_reader);
457 free(count_writer);
458 return 0;
459 }
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