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[urcu.git] / tests / test_urcu_defer.c
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90075a50 1/*
786ee85b 2 * test_urcu_defer.c
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3 *
4 * Userspace RCU library - test program (with automatic reclamation)
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>
90075a50 37
ec4e58a3 38#include <urcu/arch.h>
90075a50 39
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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
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63#include <urcu.h>
64#include <urcu-defer.h>
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65
66struct test_array {
67 int a;
68};
69
70static volatile int test_go, test_stop;
71
72static unsigned long wdelay;
73
74static struct test_array *test_rcu_pointer;
75
76static unsigned long duration;
77
78/* read-side C.S. duration, in loops */
79static unsigned long rduration;
80
81static inline void loop_sleep(unsigned long l)
82{
83 while(l-- != 0)
84 cpu_relax();
85}
86
87static int verbose_mode;
88
89#define printf_verbose(fmt, args...) \
90 do { \
91 if (verbose_mode) \
92 printf(fmt, args); \
93 } while (0)
94
95static unsigned int cpu_affinities[NR_CPUS];
96static unsigned int next_aff = 0;
97static int use_affinity = 0;
98
99pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
100
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101#ifndef HAVE_CPU_SET_T
102typedef unsigned long cpu_set_t;
103# define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
104# define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
105#endif
106
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107static void set_affinity(void)
108{
109 cpu_set_t mask;
110 int cpu;
111 int ret;
112
113 if (!use_affinity)
114 return;
115
d8540fc5 116#if HAVE_SCHED_SETAFFINITY
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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 }
d8540fc5 128
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129 CPU_ZERO(&mask);
130 CPU_SET(cpu, &mask);
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131#if SCHED_SETAFFINITY_ARGS == 2
132 sched_setaffinity(0, &mask);
133#else
90075a50 134 sched_setaffinity(0, sizeof(mask), &mask);
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135#endif
136#endif /* HAVE_SCHED_SETAFFINITY */
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137}
138
139/*
140 * returns 0 if test should end.
141 */
142static int test_duration_write(void)
143{
144 return !test_stop;
145}
146
147static int test_duration_read(void)
148{
149 return !test_stop;
150}
151
152static unsigned long long __thread nr_writes;
153static unsigned long long __thread nr_reads;
154
155static
156unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_writes;
157
158static unsigned int nr_readers;
159static unsigned int nr_writers;
160
161pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
162
163void rcu_copy_mutex_lock(void)
164{
165 int ret;
166 ret = pthread_mutex_lock(&rcu_copy_mutex);
167 if (ret) {
168 perror("Error in pthread mutex lock");
169 exit(-1);
170 }
171}
172
173void rcu_copy_mutex_unlock(void)
174{
175 int ret;
176
177 ret = pthread_mutex_unlock(&rcu_copy_mutex);
178 if (ret) {
179 perror("Error in pthread mutex unlock");
180 exit(-1);
181 }
182}
183
184void *thr_reader(void *_count)
185{
186 unsigned long long *count = _count;
187 struct test_array *local_ptr;
188
189 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
190 "reader", pthread_self(), (unsigned long)gettid());
191
192 set_affinity();
193
194 rcu_register_thread();
195
196 while (!test_go)
197 {
198 }
199 smp_mb();
200
201 for (;;) {
202 rcu_read_lock();
203 local_ptr = rcu_dereference(test_rcu_pointer);
204 debug_yield_read();
205 if (local_ptr)
206 assert(local_ptr->a == 8);
207 if (unlikely(rduration))
208 loop_sleep(rduration);
209 rcu_read_unlock();
210 nr_reads++;
211 if (unlikely(!test_duration_read()))
212 break;
213 }
214
215 rcu_unregister_thread();
216
217 *count = nr_reads;
218 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
219 "reader", pthread_self(), (unsigned long)gettid());
220 return ((void*)1);
221
222}
223
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224static void test_cb2(void *data)
225{
226}
227
228static void test_cb1(void *data)
229{
230}
231
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232void *thr_writer(void *data)
233{
234 unsigned long wtidx = (unsigned long)data;
235 struct test_array *new, *old = NULL;
236
237 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
238 "writer", pthread_self(), (unsigned long)gettid());
239
240 set_affinity();
241
786ee85b 242 rcu_defer_register_thread();
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243
244 while (!test_go)
245 {
246 }
247 smp_mb();
248
249 for (;;) {
250 new = malloc(sizeof(*new));
251 new->a = 8;
252 old = rcu_xchg_pointer(&test_rcu_pointer, new);
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253 defer_rcu(free, old);
254 defer_rcu(test_cb1, old);
255 defer_rcu(test_cb1, (void *)-2L);
256 defer_rcu(test_cb1, (void *)-2L);
257 defer_rcu(test_cb1, old);
258 defer_rcu(test_cb2, (void *)-2L);
259 defer_rcu(test_cb2, (void *)-4L);
260 defer_rcu(test_cb2, (void *)-2L);
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261 nr_writes++;
262 if (unlikely(!test_duration_write()))
263 break;
264 if (unlikely(wdelay))
265 loop_sleep(wdelay);
266 }
267
786ee85b 268 rcu_defer_unregister_thread();
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269
270 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
271 "writer", pthread_self(), (unsigned long)gettid());
272 tot_nr_writes[wtidx] = nr_writes;
273 return ((void*)2);
274}
275
276void show_usage(int argc, char **argv)
277{
278 printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
279#ifdef DEBUG_YIELD
280 printf(" [-r] [-w] (yield reader and/or writer)");
281#endif
282 printf(" [-d delay] (writer period (us))");
283 printf(" [-c duration] (reader C.S. duration (in loops))");
284 printf(" [-v] (verbose output)");
285 printf(" [-a cpu#] [-a cpu#]... (affinity)");
286 printf("\n");
287}
288
289int main(int argc, char **argv)
290{
291 int err;
292 pthread_t *tid_reader, *tid_writer;
293 void *tret;
294 unsigned long long *count_reader;
295 unsigned long long tot_reads = 0, tot_writes = 0;
296 int i, a;
297
298 if (argc < 4) {
299 show_usage(argc, argv);
300 return -1;
301 }
302
303 err = sscanf(argv[1], "%u", &nr_readers);
304 if (err != 1) {
305 show_usage(argc, argv);
306 return -1;
307 }
308
309 err = sscanf(argv[2], "%u", &nr_writers);
310 if (err != 1) {
311 show_usage(argc, argv);
312 return -1;
313 }
314
315 err = sscanf(argv[3], "%lu", &duration);
316 if (err != 1) {
317 show_usage(argc, argv);
318 return -1;
319 }
320
321 for (i = 4; i < argc; i++) {
322 if (argv[i][0] != '-')
323 continue;
324 switch (argv[i][1]) {
325#ifdef DEBUG_YIELD
326 case 'r':
327 yield_active |= YIELD_READ;
328 break;
329 case 'w':
330 yield_active |= YIELD_WRITE;
331 break;
332#endif
333 case 'a':
334 if (argc < i + 2) {
335 show_usage(argc, argv);
336 return -1;
337 }
338 a = atoi(argv[++i]);
339 cpu_affinities[next_aff++] = a;
340 use_affinity = 1;
341 printf_verbose("Adding CPU %d affinity\n", a);
342 break;
343 case 'c':
344 if (argc < i + 2) {
345 show_usage(argc, argv);
346 return -1;
347 }
348 rduration = atol(argv[++i]);
349 break;
350 case 'd':
351 if (argc < i + 2) {
352 show_usage(argc, argv);
353 return -1;
354 }
355 wdelay = atol(argv[++i]);
356 break;
357 case 'v':
358 verbose_mode = 1;
359 break;
360 }
361 }
362
363 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
364 duration, nr_readers, nr_writers);
365 printf_verbose("Writer delay : %lu loops.\n", wdelay);
366 printf_verbose("Reader duration : %lu loops.\n", rduration);
367 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
368 "main", pthread_self(), (unsigned long)gettid());
369
370 tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
371 tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
372 count_reader = malloc(sizeof(*count_reader) * nr_readers);
373 tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers);
374
375 next_aff = 0;
376
377 for (i = 0; i < nr_readers; i++) {
378 err = pthread_create(&tid_reader[i], NULL, thr_reader,
379 &count_reader[i]);
380 if (err != 0)
381 exit(1);
382 }
383 for (i = 0; i < nr_writers; i++) {
384 err = pthread_create(&tid_writer[i], NULL, thr_writer,
385 (void *)(long)i);
386 if (err != 0)
387 exit(1);
388 }
389
390 smp_mb();
391
392 test_go = 1;
393
394 sleep(duration);
395
396 test_stop = 1;
397
398 for (i = 0; i < nr_readers; i++) {
399 err = pthread_join(tid_reader[i], &tret);
400 if (err != 0)
401 exit(1);
402 tot_reads += count_reader[i];
403 }
404 for (i = 0; i < nr_writers; i++) {
405 err = pthread_join(tid_writer[i], &tret);
406 if (err != 0)
407 exit(1);
408 tot_writes += tot_nr_writes[i];
409 }
410
411 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
412 tot_writes);
413 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
414 "nr_writers %3u "
415 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
416 argv[0], duration, nr_readers, rduration,
417 nr_writers, wdelay, tot_reads, tot_writes,
418 tot_reads + tot_writes);
419 free(tid_reader);
420 free(tid_writer);
421 free(count_reader);
422 free(tot_nr_writes);
423
424 return 0;
425}
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