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 #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 static pthread_mutex_t lock;
  65
  66 static volatile int test_go, test_stop;
  67
  68 static int wdelay;
  69
  70 static volatile struct test_array test_array = { 8 };
  71
  72 static unsigned long duration;
  73
  74 /*
  75  * returns 0 if test should end.
  76  */
  77 static int test_duration_write(void)
  78 {
  79         return !test_stop;
  80 }
  81
  82 static int test_duration_read(void)
  83 {
  84         return !test_stop;
  85 }
  86
  87 static unsigned long long __thread nr_writes;
  88 static unsigned long long __thread nr_reads;
  89
  90 static unsigned long long __attribute__((aligned(128))) *tot_nr_writes;
  91 static unsigned long long __attribute__((aligned(128))) *tot_nr_reads;
  92
  93 static unsigned int nr_readers;
  94 static unsigned int nr_writers;
  95
  96 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
  97
  98 void rcu_copy_mutex_lock(void)
  99 {
 100         int ret;
 101         ret = pthread_mutex_lock(&rcu_copy_mutex);
 102         if (ret) {
 103                 perror("Error in pthread mutex lock");
 104                 exit(-1);
 105         }
 106 }
 107
 108 void rcu_copy_mutex_unlock(void)
 109 {
 110         int ret;
 111
 112         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 113         if (ret) {
 114                 perror("Error in pthread mutex unlock");
 115                 exit(-1);
 116         }
 117 }
 118
 119 void *thr_reader(void *data)
 120 {
 121         unsigned long tidx = (unsigned long)data;
 122
 123         printf("thread_begin %s, thread id : %lx, tid %lu\n",
 124                         "reader", pthread_self(), (unsigned long)gettid());
 125
 126         while (!test_go)
 127         {
 128         }
 129
 130         for (;;) {
 131                 pthread_mutex_lock(&lock);
 132                 assert(test_array.a == 8);
 133                 pthread_mutex_unlock(&lock);
 134                 nr_reads++;
 135                 if (unlikely(!test_duration_read()))
 136                         break;
 137         }
 138
 139         tot_nr_reads[tidx] = nr_reads;
 140         printf("thread_end %s, thread id : %lx, tid %lu\n",
 141                         "reader", pthread_self(), (unsigned long)gettid());
 142         return ((void*)1);
 143
 144 }
 145
 146 void *thr_writer(void *data)
 147 {
 148         unsigned long wtidx = (unsigned long)data;
 149
 150         printf("thread_begin %s, thread id : %lx, tid %lu\n",
 151                         "writer", pthread_self(), (unsigned long)gettid());
 152
 153         while (!test_go)
 154         {
 155         }
 156         smp_mb();
 157
 158         for (;;) {
 159                 pthread_mutex_lock(&lock);
 160                 test_array.a = 0;
 161                 test_array.a = 8;
 162                 pthread_mutex_unlock(&lock);
 163                 nr_writes++;
 164                 if (unlikely(!test_duration_write()))
 165                         break;
 166                 if (unlikely(wdelay))
 167                         usleep(wdelay);
 168         }
 169
 170         printf("thread_end %s, thread id : %lx, tid %lu\n",
 171                         "writer", pthread_self(), (unsigned long)gettid());
 172         tot_nr_writes[wtidx] = nr_writes;
 173         return ((void*)2);
 174 }
 175
 176 void show_usage(int argc, char **argv)
 177 {
 178         printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
 179 #ifdef DEBUG_YIELD
 180         printf(" [-r] [-w] (yield reader and/or writer)");
 181 #endif
 182         printf(" [-d delay] (writer period (us))");
 183         printf(" [-a cpu#] [-a cpu#]... (affinity)");
 184         printf("\n");
 185 }
 186
 187 cpu_set_t affinity;
 188
 189 int main(int argc, char **argv)
 190 {
 191         int err;
 192         pthread_t *tid_reader, *tid_writer;
 193         void *tret;
 194         unsigned long long *count_reader, *count_writer;
 195         unsigned long long tot_reads = 0, tot_writes = 0;
 196         int i, a;
 197         int use_affinity = 0;
 198
 199         if (argc < 4) {
 200                 show_usage(argc, argv);
 201                 return -1;
 202         }
 203         smp_mb();
 204
 205         err = sscanf(argv[1], "%u", &nr_readers);
 206         if (err != 1) {
 207                 show_usage(argc, argv);
 208                 return -1;
 209         }
 210
 211         err = sscanf(argv[2], "%u", &nr_writers);
 212         if (err != 1) {
 213                 show_usage(argc, argv);
 214                 return -1;
 215         }
 216
 217         err = sscanf(argv[3], "%lu", &duration);
 218         if (err != 1) {
 219                 show_usage(argc, argv);
 220                 return -1;
 221         }
 222
 223         CPU_ZERO(&affinity);
 224
 225         for (i = 4; i < argc; i++) {
 226                 if (argv[i][0] != '-')
 227                         continue;
 228                 switch (argv[i][1]) {
 229 #ifdef DEBUG_YIELD
 230                 case 'r':
 231                         yield_active |= YIELD_READ;
 232                         break;
 233                 case 'w':
 234                         yield_active |= YIELD_WRITE;
 235                         break;
 236 #endif
 237                 case 'a':
 238                         if (argc < i + 2) {
 239                                 show_usage(argc, argv);
 240                                 return -1;
 241                         }
 242                         a = atoi(argv[++i]);
 243                         CPU_SET(a, &affinity);
 244                         use_affinity = 1;
 245                         printf("Adding CPU %d affinity\n", a);
 246                         break;
 247                 case 'd':
 248                         if (argc < i + 2) {
 249                                 show_usage(argc, argv);
 250                                 return -1;
 251                         }
 252                         wdelay = atoi(argv[++i]);
 253                         break;
 254                 }
 255         }
 256
 257         printf("running test for %lu seconds, %u readers, %u writers.\n",
 258                 duration, nr_readers, nr_writers);
 259         printf("Writer delay : %u us.\n", wdelay);
 260         printf("thread %-6s, thread id : %lx, tid %lu\n",
 261                         "main", pthread_self(), (unsigned long)gettid());
 262
 263         if (use_affinity
 264             && sched_setaffinity(0, sizeof(affinity), &affinity) < 0) {
 265                 perror("sched_setaffinity");
 266                 exit(-1);
 267         }
 268
 269         tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
 270         tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
 271         count_reader = malloc(sizeof(*count_reader) * nr_readers);
 272         count_writer = malloc(sizeof(*count_writer) * nr_writers);
 273         tot_nr_reads = malloc(sizeof(*tot_nr_reads) * nr_readers);
 274         tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers);
 275
 276         for (i = 0; i < nr_readers; i++) {
 277                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 278                                      (void *)(long)i);
 279                 if (err != 0)
 280                         exit(1);
 281         }
 282         for (i = 0; i < nr_writers; i++) {
 283                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 284                                      (void *)(long)i);
 285                 if (err != 0)
 286                         exit(1);
 287         }
 288
 289         smp_mb();
 290
 291         test_go = 1;
 292
 293         sleep(duration);
 294
 295         test_stop = 1;
 296
 297         for (i = 0; i < nr_readers; i++) {
 298                 err = pthread_join(tid_reader[i], &tret);
 299                 if (err != 0)
 300                         exit(1);
 301                 tot_reads += tot_nr_reads[i];
 302         }
 303         for (i = 0; i < nr_writers; i++) {
 304                 err = pthread_join(tid_writer[i], &tret);
 305                 if (err != 0)
 306                         exit(1);
 307                 tot_writes += tot_nr_writes[i];
 308         }
 309
 310         printf("total number of reads : %llu, writes %llu\n", tot_reads,
 311                tot_writes);
 312         free(tid_reader);
 313         free(tid_writer);
 314         free(count_reader);
 315         free(count_writer);
 316         free(tot_nr_reads);
 317         free(tot_nr_writes);
 318         return 0;
 319 }