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