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 #include <stdio.h>
  24 #include <pthread.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <sys/types.h>
  28 #include <sys/wait.h>
  29 #include <unistd.h>
  30 #include <stdio.h>
  31 #include <assert.h>
  32 #include <sys/syscall.h>
  33
  34 #include "arch.h"
  35
  36 #if defined(_syscall0)
  37 _syscall0(pid_t, gettid)
  38 #elif defined(__NR_gettid)
  39 static inline pid_t gettid(void)
  40 {
  41         return syscall(__NR_gettid);
  42 }
  43 #else
  44 #warning "use pid as tid"
  45 static inline pid_t gettid(void)
  46 {
  47         return getpid();
  48 }
  49 #endif
  50
  51 #ifndef DYNAMIC_LINK_TEST
  52 #define _LGPL_SOURCE
  53 #else
  54 #define debug_yield_read()
  55 #endif
  56 #include "urcu.h"
  57
  58 struct test_array {
  59         int a;
  60 };
  61
  62 struct per_thread_lock {
  63         pthread_mutex_t lock;
  64 } __attribute__((aligned(128)));        /* cache-line aligned */
  65
  66 static struct per_thread_lock *per_thread_lock;
  67
  68 static volatile int test_go, test_stop;
  69
  70 static int wdelay;
  71
  72 static volatile struct test_array test_array = { 8 };
  73
  74 static unsigned long duration;
  75
  76 /*
  77  * returns 0 if test should end.
  78  */
  79 static int test_duration_write(void)
  80 {
  81         return !test_stop;
  82 }
  83
  84 static int test_duration_read(void)
  85 {
  86         return !test_stop;
  87 }
  88
  89 static unsigned long long __thread nr_writes;
  90 static unsigned long long __thread nr_reads;
  91
  92 static unsigned long long __attribute__((aligned(128))) *tot_nr_writes;
  93 static unsigned long long __attribute__((aligned(128))) *tot_nr_reads;
  94
  95 static unsigned int nr_readers;
  96 static unsigned int nr_writers;
  97
  98 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
  99
 100 void rcu_copy_mutex_lock(void)
 101 {
 102         int ret;
 103         ret = pthread_mutex_lock(&rcu_copy_mutex);
 104         if (ret) {
 105                 perror("Error in pthread mutex lock");
 106                 exit(-1);
 107         }
 108 }
 109
 110 void rcu_copy_mutex_unlock(void)
 111 {
 112         int ret;
 113
 114         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 115         if (ret) {
 116                 perror("Error in pthread mutex unlock");
 117                 exit(-1);
 118         }
 119 }
 120
 121 void *thr_reader(void *data)
 122 {
 123         unsigned long tidx = (unsigned long)data;
 124
 125         printf("thread_begin %s, thread id : %lx, tid %lu\n",
 126                         "reader", pthread_self(), (unsigned long)gettid());
 127
 128         while (!test_go)
 129         {
 130         }
 131
 132         for (;;) {
 133                 pthread_mutex_lock(&per_thread_lock[tidx].lock);
 134                 assert(test_array.a == 8);
 135                 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 136                 nr_reads++;
 137                 if (!test_duration_read())
 138                         break;
 139         }
 140
 141         tot_nr_reads[tidx] = nr_reads;
 142         printf("thread_end %s, thread id : %lx, tid %lu\n",
 143                         "reader", pthread_self(), (unsigned long)gettid());
 144         return ((void*)1);
 145
 146 }
 147
 148 void *thr_writer(void *data)
 149 {
 150         unsigned long wtidx = (unsigned long)data;
 151         long tidx;
 152
 153         printf("thread_begin %s, thread id : %lx, tid %lu\n",
 154                         "writer", pthread_self(), (unsigned long)gettid());
 155
 156         while (!test_go)
 157         {
 158         }
 159         smp_mb();
 160
 161         for (;;) {
 162                 for (tidx = 0; tidx < nr_readers; tidx++) {
 163                         pthread_mutex_lock(&per_thread_lock[tidx].lock);
 164                 }
 165                 test_array.a = 0;
 166                 test_array.a = 8;
 167                 for (tidx = nr_readers - 1; tidx >= 0; tidx--) {
 168                         pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 169                 }
 170                 nr_writes++;
 171                 if (!test_duration_write())
 172                         break;
 173                 if (wdelay)
 174                         usleep(wdelay);
 175         }
 176
 177         printf("thread_end %s, thread id : %lx, tid %lu\n",
 178                         "writer", pthread_self(), (unsigned long)gettid());
 179         tot_nr_writes[wtidx] = nr_writes;
 180         return ((void*)2);
 181 }
 182
 183 void show_usage(int argc, char **argv)
 184 {
 185         printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
 186 #ifdef DEBUG_YIELD
 187         printf(" [-r] [-w] (yield reader and/or writer)");
 188 #endif
 189         printf(" [-d delay] (writer period (us))");
 190         printf("\n");
 191 }
 192
 193 int main(int argc, char **argv)
 194 {
 195         int err;
 196         pthread_t *tid_reader, *tid_writer;
 197         void *tret;
 198         unsigned long long *count_reader, *count_writer;
 199         unsigned long long tot_reads = 0, tot_writes = 0;
 200         int i;
 201
 202         if (argc < 4) {
 203                 show_usage(argc, argv);
 204                 return -1;
 205         }
 206         smp_mb();
 207
 208         err = sscanf(argv[1], "%u", &nr_readers);
 209         if (err != 1) {
 210                 show_usage(argc, argv);
 211                 return -1;
 212         }
 213
 214         err = sscanf(argv[2], "%u", &nr_writers);
 215         if (err != 1) {
 216                 show_usage(argc, argv);
 217                 return -1;
 218         }
 219
 220         err = sscanf(argv[3], "%lu", &duration);
 221         if (err != 1) {
 222                 show_usage(argc, argv);
 223                 return -1;
 224         }
 225
 226         for (i = 4; i < argc; i++) {
 227                 if (argv[i][0] != '-')
 228                         continue;
 229                 switch (argv[i][1]) {
 230 #ifdef DEBUG_YIELD
 231                 case 'r':
 232                         yield_active |= YIELD_READ;
 233                         break;
 234                 case 'w':
 235                         yield_active |= YIELD_WRITE;
 236                         break;
 237 #endif
 238                 case 'd':
 239                         if (argc < i + 2) {
 240                                 show_usage(argc, argv);
 241                                 return -1;
 242                         }
 243                         wdelay = atoi(argv[++i]);
 244                         break;
 245                 }
 246         }
 247
 248         printf("running test for %lu seconds, %u readers, %u writers.\n",
 249                 duration, nr_readers, nr_writers);
 250         printf("Writer delay : %u us.\n", wdelay);
 251         printf("thread %-6s, thread id : %lx, tid %lu\n",
 252                         "main", pthread_self(), (unsigned long)gettid());
 253
 254         tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
 255         tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
 256         count_reader = malloc(sizeof(*count_reader) * nr_readers);
 257         count_writer = malloc(sizeof(*count_writer) * nr_writers);
 258         tot_nr_reads = malloc(sizeof(*tot_nr_reads) * nr_readers);
 259         tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers);
 260         per_thread_lock = malloc(sizeof(*per_thread_lock) * nr_readers);
 261
 262         for (i = 0; i < nr_readers; i++) {
 263                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 264                                      (void *)(long)i);
 265                 if (err != 0)
 266                         exit(1);
 267         }
 268         for (i = 0; i < nr_writers; i++) {
 269                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 270                                      (void *)(long)i);
 271                 if (err != 0)
 272                         exit(1);
 273         }
 274
 275         smp_mb();
 276
 277         test_go = 1;
 278
 279         sleep(duration);
 280
 281         test_stop = 1;
 282
 283         for (i = 0; i < nr_readers; i++) {
 284                 err = pthread_join(tid_reader[i], &tret);
 285                 if (err != 0)
 286                         exit(1);
 287                 tot_reads += tot_nr_reads[i];
 288         }
 289         for (i = 0; i < nr_writers; i++) {
 290                 err = pthread_join(tid_writer[i], &tret);
 291                 if (err != 0)
 292                         exit(1);
 293                 tot_writes += tot_nr_writes[i];
 294         }
 295
 296         printf("total number of reads : %llu, writes %llu\n", tot_reads,
 297                tot_writes);
 298         free(tid_reader);
 299         free(tid_writer);
 300         free(count_reader);
 301         free(count_writer);
 302         free(tot_nr_reads);
 303         free(tot_nr_writes);
 304         free(per_thread_lock);
 305         return 0;
 306 }