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 us */
  79 static unsigned long rduration;
  80
  81 /*
  82  * returns 0 if test should end.
  83  */
  84 static int test_duration_write(void)
  85 {
  86         return !test_stop;
  87 }
  88
  89 static int test_duration_read(void)
  90 {
  91         return !test_stop;
  92 }
  93
  94 static unsigned long long __thread nr_writes;
  95 static unsigned long long __thread nr_reads;
  96
  97 static unsigned long long __attribute__((aligned(128))) *tot_nr_writes;
  98 static unsigned long long __attribute__((aligned(128))) *tot_nr_reads;
  99
 100 static unsigned int nr_readers;
 101 static unsigned int nr_writers;
 102
 103 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 104
 105 void rcu_copy_mutex_lock(void)
 106 {
 107         int ret;
 108         ret = pthread_mutex_lock(&rcu_copy_mutex);
 109         if (ret) {
 110                 perror("Error in pthread mutex lock");
 111                 exit(-1);
 112         }
 113 }
 114
 115 void rcu_copy_mutex_unlock(void)
 116 {
 117         int ret;
 118
 119         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 120         if (ret) {
 121                 perror("Error in pthread mutex unlock");
 122                 exit(-1);
 123         }
 124 }
 125
 126 void *thr_reader(void *data)
 127 {
 128         unsigned long tidx = (unsigned long)data;
 129
 130         printf("thread_begin %s, thread id : %lx, tid %lu\n",
 131                         "reader", pthread_self(), (unsigned long)gettid());
 132
 133         while (!test_go)
 134         {
 135         }
 136
 137         for (;;) {
 138                 pthread_mutex_lock(&per_thread_lock[tidx].lock);
 139                 assert(test_array.a == 8);
 140                 if (unlikely(rduration))
 141                         usleep(rduration);
 142                 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 143                 nr_reads++;
 144                 if (unlikely(!test_duration_read()))
 145                         break;
 146         }
 147
 148         tot_nr_reads[tidx] = nr_reads;
 149         printf("thread_end %s, thread id : %lx, tid %lu\n",
 150                         "reader", pthread_self(), (unsigned long)gettid());
 151         return ((void*)1);
 152
 153 }
 154
 155 void *thr_writer(void *data)
 156 {
 157         unsigned long wtidx = (unsigned long)data;
 158         long tidx;
 159
 160         printf("thread_begin %s, thread id : %lx, tid %lu\n",
 161                         "writer", pthread_self(), (unsigned long)gettid());
 162
 163         while (!test_go)
 164         {
 165         }
 166         smp_mb();
 167
 168         for (;;) {
 169                 for (tidx = 0; tidx < nr_readers; tidx++) {
 170                         pthread_mutex_lock(&per_thread_lock[tidx].lock);
 171                 }
 172                 test_array.a = 0;
 173                 test_array.a = 8;
 174                 for (tidx = nr_readers - 1; tidx >= 0; tidx--) {
 175                         pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 176                 }
 177                 nr_writes++;
 178                 if (unlikely(!test_duration_write()))
 179                         break;
 180                 if (unlikely(wdelay))
 181                         usleep(wdelay);
 182         }
 183
 184         printf("thread_end %s, thread id : %lx, tid %lu\n",
 185                         "writer", pthread_self(), (unsigned long)gettid());
 186         tot_nr_writes[wtidx] = nr_writes;
 187         return ((void*)2);
 188 }
 189
 190 void show_usage(int argc, char **argv)
 191 {
 192         printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
 193 #ifdef DEBUG_YIELD
 194         printf(" [-r] [-w] (yield reader and/or writer)");
 195 #endif
 196         printf(" [-d delay] (writer period (us))");
 197         printf(" [-c duration] (reader C.S. duration (us))");
 198         printf(" [-a cpu#] [-a cpu#]... (affinity)");
 199         printf("\n");
 200 }
 201
 202 cpu_set_t affinity;
 203
 204 int main(int argc, char **argv)
 205 {
 206         int err;
 207         pthread_t *tid_reader, *tid_writer;
 208         void *tret;
 209         unsigned long long *count_reader, *count_writer;
 210         unsigned long long tot_reads = 0, tot_writes = 0;
 211         int i, a;
 212         int use_affinity = 0;
 213
 214         if (argc < 4) {
 215                 show_usage(argc, argv);
 216                 return -1;
 217         }
 218         smp_mb();
 219
 220         err = sscanf(argv[1], "%u", &nr_readers);
 221         if (err != 1) {
 222                 show_usage(argc, argv);
 223                 return -1;
 224         }
 225
 226         err = sscanf(argv[2], "%u", &nr_writers);
 227         if (err != 1) {
 228                 show_usage(argc, argv);
 229                 return -1;
 230         }
 231
 232         err = sscanf(argv[3], "%lu", &duration);
 233         if (err != 1) {
 234                 show_usage(argc, argv);
 235                 return -1;
 236         }
 237
 238         CPU_ZERO(&affinity);
 239
 240         for (i = 4; i < argc; i++) {
 241                 if (argv[i][0] != '-')
 242                         continue;
 243                 switch (argv[i][1]) {
 244 #ifdef DEBUG_YIELD
 245                 case 'r':
 246                         yield_active |= YIELD_READ;
 247                         break;
 248                 case 'w':
 249                         yield_active |= YIELD_WRITE;
 250                         break;
 251 #endif
 252                 case 'a':
 253                         if (argc < i + 2) {
 254                                 show_usage(argc, argv);
 255                                 return -1;
 256                         }
 257                         a = atoi(argv[++i]);
 258                         CPU_SET(a, &affinity);
 259                         use_affinity = 1;
 260                         printf("Adding CPU %d affinity\n", a);
 261                         break;
 262                 case 'c':
 263                         if (argc < i + 2) {
 264                                 show_usage(argc, argv);
 265                                 return -1;
 266                         }
 267                         rduration = atoi(argv[++i]);
 268                         break;
 269                 case 'd':
 270                         if (argc < i + 2) {
 271                                 show_usage(argc, argv);
 272                                 return -1;
 273                         }
 274                         wdelay = atoi(argv[++i]);
 275                         break;
 276                 }
 277         }
 278
 279         printf("running test for %lu seconds, %u readers, %u writers.\n",
 280                 duration, nr_readers, nr_writers);
 281         printf("Writer delay : %u us.\n", wdelay);
 282         printf("thread %-6s, thread id : %lx, tid %lu\n",
 283                         "main", pthread_self(), (unsigned long)gettid());
 284
 285         if (use_affinity
 286             && sched_setaffinity(0, sizeof(affinity), &affinity) < 0) {
 287                 perror("sched_setaffinity");
 288                 exit(-1);
 289         }
 290
 291         tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
 292         tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
 293         count_reader = malloc(sizeof(*count_reader) * nr_readers);
 294         count_writer = malloc(sizeof(*count_writer) * nr_writers);
 295         tot_nr_reads = malloc(sizeof(*tot_nr_reads) * nr_readers);
 296         tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers);
 297         per_thread_lock = malloc(sizeof(*per_thread_lock) * nr_readers);
 298
 299         for (i = 0; i < nr_readers; i++) {
 300                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 301                                      (void *)(long)i);
 302                 if (err != 0)
 303                         exit(1);
 304         }
 305         for (i = 0; i < nr_writers; i++) {
 306                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 307                                      (void *)(long)i);
 308                 if (err != 0)
 309                         exit(1);
 310         }
 311
 312         smp_mb();
 313
 314         test_go = 1;
 315
 316         sleep(duration);
 317
 318         test_stop = 1;
 319
 320         for (i = 0; i < nr_readers; i++) {
 321                 err = pthread_join(tid_reader[i], &tret);
 322                 if (err != 0)
 323                         exit(1);
 324                 tot_reads += tot_nr_reads[i];
 325         }
 326         for (i = 0; i < nr_writers; i++) {
 327                 err = pthread_join(tid_writer[i], &tret);
 328                 if (err != 0)
 329                         exit(1);
 330                 tot_writes += tot_nr_writes[i];
 331         }
 332
 333         printf("total number of reads : %llu, writes %llu\n", tot_reads,
 334                tot_writes);
 335         free(tid_reader);
 336         free(tid_writer);
 337         free(count_reader);
 338         free(count_writer);
 339         free(tot_nr_reads);
 340         free(tot_nr_writes);
 341         free(per_thread_lock);
 342         return 0;
 343 }