test_perthreadlock.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 #if defined(_syscall0)
  39 _syscall0(pid_t, gettid)
  40 #elif defined(__NR_gettid)
  41 static inline pid_t gettid(void)
  42 {
  43         return syscall(__NR_gettid);
  44 }
  45 #else
  46 #warning "use pid as tid"
  47 static inline pid_t gettid(void)
  48 {
  49         return getpid();
  50 }
  51 #endif
  52
  53 #ifndef DYNAMIC_LINK_TEST
  54 #define _LGPL_SOURCE
  55 #else
  56 #define debug_yield_read()
  57 #endif
  58 #include "urcu.h"
  59
  60 struct test_array {
  61         int a;
  62 };
  63
  64 struct per_thread_lock {
  65         pthread_mutex_t lock;
  66 } __attribute__((aligned(128)));        /* cache-line aligned */
  67
  68 static struct per_thread_lock *per_thread_lock;
  69
  70 static volatile int test_go, test_stop;
  71
  72 static int wdelay;
  73
  74 static volatile struct test_array test_array = { 8 };
  75
  76 static unsigned long duration;
  77
  78 /* read-side C.S. duration, in loops */
  79 static unsigned long rduration;
  80
  81 static inline void loop_sleep(unsigned long l)
  82 {
  83         while(l-- != 0)
  84                 cpu_relax();
  85 }
  86
  87 static int verbose_mode;
  88
  89 #define printf_verbose(fmt, args...)            \
  90         do {                                    \
  91                 if (verbose_mode)               \
  92                         printf(fmt, args);      \
  93         } while (0)
  94
  95 /*
  96  * returns 0 if test should end.
  97  */
  98 static int test_duration_write(void)
  99 {
 100         return !test_stop;
 101 }
 102
 103 static int test_duration_read(void)
 104 {
 105         return !test_stop;
 106 }
 107
 108 static unsigned long long __thread nr_writes;
 109 static unsigned long long __thread nr_reads;
 110
 111 static unsigned long long __attribute__((aligned(128))) *tot_nr_writes;
 112 static unsigned long long __attribute__((aligned(128))) *tot_nr_reads;
 113
 114 static unsigned int nr_readers;
 115 static unsigned int nr_writers;
 116
 117 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 118
 119 void rcu_copy_mutex_lock(void)
 120 {
 121         int ret;
 122         ret = pthread_mutex_lock(&rcu_copy_mutex);
 123         if (ret) {
 124                 perror("Error in pthread mutex lock");
 125                 exit(-1);
 126         }
 127 }
 128
 129 void rcu_copy_mutex_unlock(void)
 130 {
 131         int ret;
 132
 133         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 134         if (ret) {
 135                 perror("Error in pthread mutex unlock");
 136                 exit(-1);
 137         }
 138 }
 139
 140 void *thr_reader(void *data)
 141 {
 142         unsigned long tidx = (unsigned long)data;
 143
 144         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 145                         "reader", pthread_self(), (unsigned long)gettid());
 146
 147         while (!test_go)
 148         {
 149         }
 150
 151         for (;;) {
 152                 pthread_mutex_lock(&per_thread_lock[tidx].lock);
 153                 assert(test_array.a == 8);
 154                 if (unlikely(rduration))
 155                         loop_sleep(rduration);
 156                 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 157                 nr_reads++;
 158                 if (unlikely(!test_duration_read()))
 159                         break;
 160         }
 161
 162         tot_nr_reads[tidx] = nr_reads;
 163         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 164                         "reader", pthread_self(), (unsigned long)gettid());
 165         return ((void*)1);
 166
 167 }
 168
 169 void *thr_writer(void *data)
 170 {
 171         unsigned long wtidx = (unsigned long)data;
 172         long tidx;
 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                 for (tidx = 0; tidx < nr_readers; tidx++) {
 184                         pthread_mutex_lock(&per_thread_lock[tidx].lock);
 185                 }
 186                 test_array.a = 0;
 187                 test_array.a = 8;
 188                 for (tidx = nr_readers - 1; tidx >= 0; tidx--) {
 189                         pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 190                 }
 191                 nr_writes++;
 192                 if (unlikely(!test_duration_write()))
 193                         break;
 194                 if (unlikely(wdelay))
 195                         usleep(wdelay);
 196         }
 197
 198         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 199                         "writer", pthread_self(), (unsigned long)gettid());
 200         tot_nr_writes[wtidx] = nr_writes;
 201         return ((void*)2);
 202 }
 203
 204 void show_usage(int argc, char **argv)
 205 {
 206         printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
 207 #ifdef DEBUG_YIELD
 208         printf(" [-r] [-w] (yield reader and/or writer)");
 209 #endif
 210         printf(" [-d delay] (writer period (us))");
 211         printf(" [-c duration] (reader C.S. duration (in loops))");
 212         printf(" [-v] (verbose output)");
 213         printf(" [-a cpu#] [-a cpu#]... (affinity)");
 214         printf("\n");
 215 }
 216
 217 cpu_set_t affinity;
 218
 219 int main(int argc, char **argv)
 220 {
 221         int err;
 222         pthread_t *tid_reader, *tid_writer;
 223         void *tret;
 224         unsigned long long *count_reader, *count_writer;
 225         unsigned long long tot_reads = 0, tot_writes = 0;
 226         int i, a;
 227         int use_affinity = 0;
 228
 229         if (argc < 4) {
 230                 show_usage(argc, argv);
 231                 return -1;
 232         }
 233         smp_mb();
 234
 235         err = sscanf(argv[1], "%u", &nr_readers);
 236         if (err != 1) {
 237                 show_usage(argc, argv);
 238                 return -1;
 239         }
 240
 241         err = sscanf(argv[2], "%u", &nr_writers);
 242         if (err != 1) {
 243                 show_usage(argc, argv);
 244                 return -1;
 245         }
 246
 247         err = sscanf(argv[3], "%lu", &duration);
 248         if (err != 1) {
 249                 show_usage(argc, argv);
 250                 return -1;
 251         }
 252
 253         CPU_ZERO(&affinity);
 254
 255         for (i = 4; i < argc; i++) {
 256                 if (argv[i][0] != '-')
 257                         continue;
 258                 switch (argv[i][1]) {
 259 #ifdef DEBUG_YIELD
 260                 case 'r':
 261                         yield_active |= YIELD_READ;
 262                         break;
 263                 case 'w':
 264                         yield_active |= YIELD_WRITE;
 265                         break;
 266 #endif
 267                 case 'a':
 268                         if (argc < i + 2) {
 269                                 show_usage(argc, argv);
 270                                 return -1;
 271                         }
 272                         a = atoi(argv[++i]);
 273                         CPU_SET(a, &affinity);
 274                         use_affinity = 1;
 275                         printf_verbose("Adding CPU %d affinity\n", a);
 276                         break;
 277                 case 'c':
 278                         if (argc < i + 2) {
 279                                 show_usage(argc, argv);
 280                                 return -1;
 281                         }
 282                         rduration = atoi(argv[++i]);
 283                         break;
 284                 case 'd':
 285                         if (argc < i + 2) {
 286                                 show_usage(argc, argv);
 287                                 return -1;
 288                         }
 289                         wdelay = atoi(argv[++i]);
 290                         break;
 291                 case 'v':
 292                         verbose_mode = 1;
 293                         break;
 294                 }
 295         }
 296
 297         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 298                 duration, nr_readers, nr_writers);
 299         printf_verbose("Writer delay : %u us.\n", wdelay);
 300         printf_verbose("Reader duration : %lu loops.\n", rduration);
 301         printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
 302                         "main", pthread_self(), (unsigned long)gettid());
 303
 304         if (use_affinity
 305             && sched_setaffinity(0, sizeof(affinity), &affinity) < 0) {
 306                 perror("sched_setaffinity");
 307                 exit(-1);
 308         }
 309
 310         tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
 311         tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
 312         count_reader = malloc(sizeof(*count_reader) * nr_readers);
 313         count_writer = malloc(sizeof(*count_writer) * nr_writers);
 314         tot_nr_reads = malloc(sizeof(*tot_nr_reads) * nr_readers);
 315         tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers);
 316         per_thread_lock = malloc(sizeof(*per_thread_lock) * nr_readers);
 317
 318         for (i = 0; i < nr_readers; i++) {
 319                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 320                                      (void *)(long)i);
 321                 if (err != 0)
 322                         exit(1);
 323         }
 324         for (i = 0; i < nr_writers; i++) {
 325                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 326                                      (void *)(long)i);
 327                 if (err != 0)
 328                         exit(1);
 329         }
 330
 331         smp_mb();
 332
 333         test_go = 1;
 334
 335         sleep(duration);
 336
 337         test_stop = 1;
 338
 339         for (i = 0; i < nr_readers; i++) {
 340                 err = pthread_join(tid_reader[i], &tret);
 341                 if (err != 0)
 342                         exit(1);
 343                 tot_reads += tot_nr_reads[i];
 344         }
 345         for (i = 0; i < nr_writers; i++) {
 346                 err = pthread_join(tid_writer[i], &tret);
 347                 if (err != 0)
 348                         exit(1);
 349                 tot_writes += tot_nr_writes[i];
 350         }
 351
 352         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 353                tot_writes);
 354         printf("SUMMARY %-15s testdur %4lu nr_readers %3u rdur %6lu "
 355                 "nr_writers %3u "
 356                 "wdelay %4u nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
 357                 argv[0], duration, nr_readers, rduration,
 358                 nr_writers, wdelay, tot_reads, tot_writes,
 359                 tot_reads + tot_writes);
 360
 361         free(tid_reader);
 362         free(tid_writer);
 363         free(count_reader);
 364         free(count_writer);
 365         free(tot_nr_reads);
 366         free(tot_nr_writes);
 367         free(per_thread_lock);
 368         return 0;
 369 }