test_mutex.c

   1 /*
   2  * test_urcu.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>
  35
  36 #include "arch.h"
  37
  38 /* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
  39 #define CACHE_LINE_SIZE 4096
  40
  41 #if defined(_syscall0)
  42 _syscall0(pid_t, gettid)
  43 #elif defined(__NR_gettid)
  44 static inline pid_t gettid(void)
  45 {
  46         return syscall(__NR_gettid);
  47 }
  48 #else
  49 #warning "use pid as tid"
  50 static inline pid_t gettid(void)
  51 {
  52         return getpid();
  53 }
  54 #endif
  55
  56 #ifndef DYNAMIC_LINK_TEST
  57 #define _LGPL_SOURCE
  58 #else
  59 #define debug_yield_read()
  60 #endif
  61 #include "urcu.h"
  62
  63 struct test_array {
  64         int a;
  65 };
  66
  67 static pthread_mutex_t lock;
  68
  69 static volatile int test_go, test_stop;
  70
  71 static unsigned long wdelay;
  72
  73 static volatile struct test_array test_array = { 8 };
  74
  75 static unsigned long duration;
  76
  77 /* read-side C.S. duration, in loops */
  78 static unsigned long rduration;
  79
  80 static inline void loop_sleep(unsigned long l)
  81 {
  82         while(l-- != 0)
  83                 cpu_relax();
  84 }
  85
  86 static int verbose_mode;
  87
  88 #define printf_verbose(fmt, args...)            \
  89         do {                                    \
  90                 if (verbose_mode)               \
  91                         printf(fmt, args);      \
  92         } while (0)
  93
  94 /*
  95  * returns 0 if test should end.
  96  */
  97 static int test_duration_write(void)
  98 {
  99         return !test_stop;
 100 }
 101
 102 static int test_duration_read(void)
 103 {
 104         return !test_stop;
 105 }
 106
 107 static unsigned long long __thread nr_writes;
 108 static unsigned long long __thread nr_reads;
 109
 110 static
 111 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_writes;
 112 static
 113 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_reads;
 114
 115 static unsigned int nr_readers;
 116 static unsigned int nr_writers;
 117
 118 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 119
 120 void rcu_copy_mutex_lock(void)
 121 {
 122         int ret;
 123         ret = pthread_mutex_lock(&rcu_copy_mutex);
 124         if (ret) {
 125                 perror("Error in pthread mutex lock");
 126                 exit(-1);
 127         }
 128 }
 129
 130 void rcu_copy_mutex_unlock(void)
 131 {
 132         int ret;
 133
 134         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 135         if (ret) {
 136                 perror("Error in pthread mutex unlock");
 137                 exit(-1);
 138         }
 139 }
 140
 141 void *thr_reader(void *data)
 142 {
 143         unsigned long tidx = (unsigned long)data;
 144
 145         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 146                         "reader", pthread_self(), (unsigned long)gettid());
 147
 148         while (!test_go)
 149         {
 150         }
 151
 152         for (;;) {
 153                 pthread_mutex_lock(&lock);
 154                 assert(test_array.a == 8);
 155                 if (unlikely(rduration))
 156                         loop_sleep(rduration);
 157                 pthread_mutex_unlock(&lock);
 158                 nr_reads++;
 159                 if (unlikely(!test_duration_read()))
 160                         break;
 161         }
 162
 163         tot_nr_reads[tidx] = nr_reads;
 164         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 165                         "reader", pthread_self(), (unsigned long)gettid());
 166         return ((void*)1);
 167
 168 }
 169
 170 void *thr_writer(void *data)
 171 {
 172         unsigned long wtidx = (unsigned long)data;
 173
 174         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 175                         "writer", pthread_self(), (unsigned long)gettid());
 176
 177         while (!test_go)
 178         {
 179         }
 180         smp_mb();
 181
 182         for (;;) {
 183                 pthread_mutex_lock(&lock);
 184                 test_array.a = 0;
 185                 test_array.a = 8;
 186                 pthread_mutex_unlock(&lock);
 187                 nr_writes++;
 188                 if (unlikely(!test_duration_write()))
 189                         break;
 190                 if (unlikely(wdelay))
 191                         loop_sleep(wdelay);
 192         }
 193
 194         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 195                         "writer", pthread_self(), (unsigned long)gettid());
 196         tot_nr_writes[wtidx] = nr_writes;
 197         return ((void*)2);
 198 }
 199
 200 void show_usage(int argc, char **argv)
 201 {
 202         printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
 203 #ifdef DEBUG_YIELD
 204         printf(" [-r] [-w] (yield reader and/or writer)");
 205 #endif
 206         printf(" [-d delay] (writer period (us))");
 207         printf(" [-c duration] (reader C.S. duration (in loops))");
 208         printf(" [-v] (verbose output)");
 209         printf(" [-a cpu#] [-a cpu#]... (affinity)");
 210         printf("\n");
 211 }
 212
 213 cpu_set_t affinity;
 214
 215 int main(int argc, char **argv)
 216 {
 217         int err;
 218         pthread_t *tid_reader, *tid_writer;
 219         void *tret;
 220         unsigned long long *count_reader, *count_writer;
 221         unsigned long long tot_reads = 0, tot_writes = 0;
 222         int i, a;
 223         int use_affinity = 0;
 224
 225         if (argc < 4) {
 226                 show_usage(argc, argv);
 227                 return -1;
 228         }
 229         smp_mb();
 230
 231         err = sscanf(argv[1], "%u", &nr_readers);
 232         if (err != 1) {
 233                 show_usage(argc, argv);
 234                 return -1;
 235         }
 236
 237         err = sscanf(argv[2], "%u", &nr_writers);
 238         if (err != 1) {
 239                 show_usage(argc, argv);
 240                 return -1;
 241         }
 242
 243         err = sscanf(argv[3], "%lu", &duration);
 244         if (err != 1) {
 245                 show_usage(argc, argv);
 246                 return -1;
 247         }
 248
 249         CPU_ZERO(&affinity);
 250
 251         for (i = 4; i < argc; i++) {
 252                 if (argv[i][0] != '-')
 253                         continue;
 254                 switch (argv[i][1]) {
 255 #ifdef DEBUG_YIELD
 256                 case 'r':
 257                         yield_active |= YIELD_READ;
 258                         break;
 259                 case 'w':
 260                         yield_active |= YIELD_WRITE;
 261                         break;
 262 #endif
 263                 case 'a':
 264                         if (argc < i + 2) {
 265                                 show_usage(argc, argv);
 266                                 return -1;
 267                         }
 268                         a = atoi(argv[++i]);
 269                         CPU_SET(a, &affinity);
 270                         use_affinity = 1;
 271                         printf_verbose("Adding CPU %d affinity\n", a);
 272                         break;
 273                 case 'c':
 274                         if (argc < i + 2) {
 275                                 show_usage(argc, argv);
 276                                 return -1;
 277                         }
 278                         rduration = atol(argv[++i]);
 279                         break;
 280                 case 'd':
 281                         if (argc < i + 2) {
 282                                 show_usage(argc, argv);
 283                                 return -1;
 284                         }
 285                         wdelay = atol(argv[++i]);
 286                         break;
 287                 case 'v':
 288                         verbose_mode = 1;
 289                         break;
 290                 }
 291         }
 292
 293         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 294                 duration, nr_readers, nr_writers);
 295         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 296         printf_verbose("Reader duration : %lu loops.\n", rduration);
 297         printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
 298                         "main", pthread_self(), (unsigned long)gettid());
 299
 300         if (use_affinity
 301             && sched_setaffinity(0, sizeof(affinity), &affinity) < 0) {
 302                 perror("sched_setaffinity");
 303                 exit(-1);
 304         }
 305
 306         tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
 307         tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
 308         count_reader = malloc(sizeof(*count_reader) * nr_readers);
 309         count_writer = malloc(sizeof(*count_writer) * nr_writers);
 310         tot_nr_reads = malloc(sizeof(*tot_nr_reads) * nr_readers);
 311         tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers);
 312
 313         for (i = 0; i < nr_readers; i++) {
 314                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 315                                      (void *)(long)i);
 316                 if (err != 0)
 317                         exit(1);
 318         }
 319         for (i = 0; i < nr_writers; i++) {
 320                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 321                                      (void *)(long)i);
 322                 if (err != 0)
 323                         exit(1);
 324         }
 325
 326         smp_mb();
 327
 328         test_go = 1;
 329
 330         sleep(duration);
 331
 332         test_stop = 1;
 333
 334         for (i = 0; i < nr_readers; i++) {
 335                 err = pthread_join(tid_reader[i], &tret);
 336                 if (err != 0)
 337                         exit(1);
 338                 tot_reads += tot_nr_reads[i];
 339         }
 340         for (i = 0; i < nr_writers; i++) {
 341                 err = pthread_join(tid_writer[i], &tret);
 342                 if (err != 0)
 343                         exit(1);
 344                 tot_writes += tot_nr_writes[i];
 345         }
 346
 347         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 348                tot_writes);
 349         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
 350                 "nr_writers %3u "
 351                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
 352                 argv[0], duration, nr_readers, rduration,
 353                 nr_writers, wdelay, tot_reads, tot_writes,
 354                 tot_reads + tot_writes);
 355
 356         free(tid_reader);
 357         free(tid_writer);
 358         free(count_reader);
 359         free(count_writer);
 360         free(tot_nr_reads);
 361         free(tot_nr_writes);
 362         return 0;
 363 }